CN101627625A - Communication system, transmission device, transmission method, reception device, and reception method - Google Patents

Abstract

In order to enable optimization processing according to the type of content of a video signal (image data) on the reception side, an AV system (42) including an HD recorder (41) and a display (42) uses an HDMI communication interface. An HDMI source (53) of an HD recorder (41) transmits image data (video signals) to an HDMI receiver (61) of a display (42) by means of differential signals over three TMDS channels. The HDMI source (53) inserts information on content identification for identifying the type of the content of the image data to be transmitted in the AVI InfoFrame packet located in the blanking period. A control unit (64) of the display (42) controls operations of a display processing section (62) for performing display processing on image data and a display section (63) for displaying an image, based on content identification information (ITC, CT1, CT0) received by the HDMI receiver (61).

Description

Communication system, transmitting device, transmitting method, receiving device and receiving method

technical field

The present invention relates to a communication system, a transmission device, a transmission method, a reception device, and a reception method in which a communication interface such as, for example, HDMI (High Definition Multimedia Interface) is used. Specifically, the present invention relates to a communication system or the like in which an image signal in which content identification information is inserted in a blank period is transmitted in the form of a differential signal through a plurality of channels, and the receiving end can depend on the content based on the content identification information. type to perform optimized processing on image signals.

Background technique

In recent years, HDMI has been and is being popularized as a communication interface for transmitting digital image signals, that is, from a DVD (Digital Versatile Disc) recorder, a set-top box, or some other AV source (Audio Visual Source) for example. High-speed transmission of uncompressed (baseband) video signals (hereinafter "picture data") and digital audio signals (hereinafter "sound data") associated with the video signals to a television receiver, projector, or some other display device data") (for example, see Patent Document 1).

Regarding HDMI, Patent Document 1: Japanese Patent Laid-Open No. 2006-319503 describes TMDS that unidirectionally transmits image data and sound data at high speed from an HDMI source (HDMI source) to an HDMI sink (HDMI sink) (Transition Minimal Differential Signaling) channels, CEC lines (Consumer Electronics Control Lines) that perform bi-directional communication between HDMI source and HDMI sink, etc.

Contents of the invention

technical problem

The above-mentioned HDMI is originally a communication interface for transmitting image data of dynamic screen content. However, in addition to moving pictures, still pictures, texts, movies, games, and the like also exist as types of content. Processing for displaying an image, such as, for example, processing for contour emphasis or the like, is performed on the receiving side of the image data. However, it is required to make it possible to perform optimization processing on such image data.

An object of the present invention is to make it possible for the receiving side to perform optimized processing of an image signal (image data) depending on content.

Technical solutions

The idea of the present invention lies in the sending device, which is characterized in that the sending device includes:

an identification information inserting section configured to insert content identification information for identifying a type of the predetermined content into a blank period of an image signal of the predetermined content to be transmitted, and

A transmitting section configured to transmit an image signal having content identification information inserted in a blank period thereof by the identification information insertion section in the form of a differential signal through a plurality of channels.

In the present invention, the identification information inserting section inserts the content identification information for identifying the type of the predetermined content to be transmitted in a blank period of the image signal of the predetermined content. For example, an image signal of a predetermined content to be transmitted is obtained by reproduction from a recording medium by the reproduction section. Or, for example, an image signal of predetermined content to be transmitted is obtained by picking up an image pickup by means of a camera section.

The content identification information includes, for example, information indicating the type of content. Or, for example, the content identification information includes one or both of information indicating a vendor name and information indicating a type of source device. For example, AVI InfoFrame using HDMI inserts content identification information into a blank period of an image signal of predetermined content. Alternatively, content identification information is inserted into a blank period of an image signal of predetermined content using SPD InfoFrame (vendor name area, source device type area, etc.) of HDMI.

The transmission section transmits the image signal having the content identification information inserted in its blank period in this manner in the form of a differential signal through a plurality of channels. As a result, the receiving side of the image signal can discern what content the received image signal relates to from the content identification information inserted in the blank period, and can perform optimization processing on the image signal depending on the type of the content.

In the present invention, for example, the content identification information may be identification information that identifies at least whether predetermined content is still picture content. In this example, the receiving side can determine based on the content identification information whether the received image information relates to still picture content, and can perform optimization processing on the image signal related to still picture content.

In the present invention, for example, content identification information can be formed from a plurality of hierarchically placed data. For example, the content identification information is formed of first data and second data, wherein the first data is formed of 1-bit data, the second data is formed of 2-bit data, and the second data is further used when the first data is in one state. data. In this instance, the load of determination processing on the receiving side can be reduced by placing data for determining content transmitted at a high frequency in a higher-level layer. For example, when the content identification information is formed of the above-mentioned 1-bit first data and 2-bit second data, it is possible to identify five different contents such as dynamic picture, text, still picture, movie, and game. For example, when the transmission frequency of dynamic pictures is high, 1-bit first data is used as the identification information of whether the content is a dynamic picture.

In the present invention, for example, the transmitting device may further include a color space information inserting section configured to insert the color space information of the image signal in the blank period of the image signal of the predetermined content to be transmitted, and the color The definition of spatial information may vary in response to the type of content indicated by the content identification information. With this configuration, the reception side of the image signal can display an image based on the image signal using an optimized color space depending on the type of content.

In the present invention, for example, the definition of color space information may vary depending at least on whether predetermined content is a still picture. In this instance, the receiving side can display an image based on an image signal of a still picture in an optimized color space.

In the present invention, for example, the transmission device may further include a user operation section configured to allow a user to designate a color space of an image signal of predetermined content to be transmitted. In this instance, the user can designate a desired color space in consideration of the color space supported by the receiving side and the like.

In the present invention, for example, the transmission device may further include a color space information acquisition section configured to acquire, from the transmission destination of the image signal of the predetermined content to be transmitted, information about the color space that the transmission destination can support. information. In this instance, when the user designates the color space as described above, the user can easily recognize the color space supported by the receiving side.

In the present invention, for example, the transmission device may be configured such that it further includes a user operation section configured to allow the user to designate the color space of an image signal of predetermined content to be transmitted and the user can use the user operation section based on the color space specified by the color space. The information of the color space acquired by the space information acquisition section specifies a predetermined color space among the indicated color spaces.

In the present invention, for example, the transmission device may further include a color space setting section configured to select a predetermined color space from the color spaces indicated by the information of the color space acquired by the color space information acquisition section space to automatically set the color space of the image signal of the predetermined content to be transmitted. In this instance, since the color space supported by the receiving side is automatically set, it is possible to reduce the user's labor and reduce the user's time.

Furthermore, in the present invention, for example, the transmission device may be configured so that it further includes a quantization range information insertion section configured to insert quantization of the image signal into a blank period of an image signal of predetermined content to be transmitted. range information, and the definition of the quantized range information varies depending on the type of predetermined content indicated by the content identification information. With this configuration, the reception side of the image signal can display an image based on the image signal at an optimized level according to the type of content.

Furthermore, in the present invention, for example, the definition of quantization range information may vary depending at least on whether or not predetermined content is a still picture. In this instance, the receiving side can display an image based on an image signal of still picture content at an optimized level.

Another concept of the present invention lies in the receiving device, characterized in that the receiving device comprises:

a receiving section configured to receive an image signal transmitted thereto in the form of a differential signal through a plurality of channels and having content identification information for identifying a type of content inserted in a blank period,

a display processing section configured to perform processing for display on the image signal received by the receiving section, and

A control section configured to control the operation of the display processing section based on the insertion of the content identification information into a blank period of the image signal received by the receiving section.

In the present invention, an image signal transmitted to a receiving apparatus in the form of a differential signal through a plurality of channels and having content identification information inserted in a blank period thereof is received by the receiving section. Then, the display processing section performs processing for display such as outline emphasis on the received image signal. In this instance, the control section controls the operation of the display processing section based on the content identification information inserted in the blank period of the image signal received by the reception section. As a result, the display processing section changes its operation depending on what the received image signal relates to, and performs optimization processing on the image signal.

In the present invention, for example, the reception device may be configured such that the display processing section includes at least an outline emphasis section configured to perform outline emphasis on an image signal, and the control section controls so that when the content identification information indicates text, the outline emphasis section does not outline the image signal. Signal performs contour emphasis. This prevents outline emphasis from making characters difficult to read.

In the present invention, for example, the reception device may be configured such that the display processing section includes at least a color space changing section configured to change the color space, and the control section controls the color space changing section so that when the content identification information indicates a still picture, the color space is changed to Changes to the color space used for still pictures. This makes it possible to advantageously display an image in a color space for a still picture, based on an image signal of the content of the still picture.

In the present invention, for example, the reception device may be configured such that the display processing section includes at least a level changing section configured to change the level of the black side, and the control section controls the level changing section so that when the content identification information indicates a movie, the level of the black side is raised. grade. With this configuration, in the image based on the image signal of the movie content, the black side gradation is emphasized, and an image suitable for the movie content can be displayed.

In the present invention, for example, the reception device may be configured such that the display processing section includes at least a picture quality improvement section configured to perform processing for picture quality change on the image signal and to provide a predetermined delay to the image signal, And the control section controls such that the picture quality improvement section does not perform processing on the image signal when the content identification information indicates a game. With this configuration, it is possible to alleviate the delay of the image with respect to the sound, and to prevent a feeling of unfamiliarity due to displacement between the sound and the image.

In the present invention, for example, the reception device may be configured such that the content identification information indicates a still or moving picture and the control section controls the display processing section so that when the content identification information indicates a still picture, processing suitable for a still picture is performed on the image signal, and the control section controls The display processing section causes processing suitable for a dynamic picture to be performed on the image signal when the content identification information indicates a dynamic picture. This makes it possible to perform optimized processing on image signals depending on the type of content.

In the present invention, the receiving device may be configured such that the receiving device further includes a mode setting section configured to allow the user to set one of an automatic mode, a still picture mode, and a dynamic picture mode, the content identification information Indicating a still picture or a dynamic picture, when the automatic mode is set by the mode setting section, the control section controls the display processing section so that processing corresponding to the type of content (still picture or dynamic picture) indicated by the content identification information is performed on the image signal. processing, and when the still picture mode or the dynamic picture mode is set by the mode setting section, the control section controls the display processing section so that processing suitable for the set mode is performed on the image signal. With this configuration, the user can forcibly cause the reception device to perform processing corresponding to a still picture or a moving picture on the image signal.

In the present invention, for example, the reception device may be configured such that the content identification information indicates a still picture, a moving picture, text, a movie, or a game and the control section controls the display processing section so that the image signal is executed corresponding to the content (still image) indicated by the content identification information. picture, dynamic picture, text, movie or game) type processing. This makes it possible to perform optimized processing on image signals depending on the type of content.

In the present invention, for example, the receiving device may be configured such that it further includes a mode setting section configured to allow the user to set an automatic mode, a still picture mode, a moving picture mode, a text mode, a movie mode, and a game mode. One of modes in which the content identification information indicates a still picture, a moving picture, text, a movie, or a game, and when the automatic mode is set by the mode setting section, the control section controls the display processing section so that the image signal is The processing of the type (still picture, dynamic picture, text, movie or game) of the content indicated by the content identification information, and when the still picture mode or the dynamic picture mode is set by the mode setting part, the control part controls the display processing part so that Processing appropriate for the set mode is performed on the image signal. In this instance, by setting one of the still picture mode, moving picture mode, text mode, movie mode and game mode, the user can cause the receiving device to forcibly execute the image signal suitable for still picture, moving picture, text mode, etc. , movie or game processing.

In the present invention, for example, the receiving apparatus may be configured so that, in addition to content identification information, color space information whose definition is responsive to that indicated by the content identification information is inserted in a blank period of the image signal received by the receiving section. The type of content varies, and the control section controls the operation of the display processing section based on the content identification information and the color space information inserted into the blank period of the image signal received by the receiving section. With this configuration, the operation of the display processing section varies depending on what content a received image signal relates to, and it is possible to display an image in an optimized color space depending on the type of content.

In the present invention, for example, the reception device may be configured such that the display processing section includes at least a color range expansion section configured to expand the color range, and the control section controls the color range expansion section so that when the color space indicated by the color space information is sRGB , to perform color range expansion processing on the image signal. This makes it possible to display a good image whose color range is expanded.

In the present invention, for example, the receiving device may be configured such that the color space information indicates a color space in sRGB, sYCC, or Adobe RGB, and the control section sets the color space to the color space indicated by the color space information. This makes it possible to set an optimized color space corresponding to an image signal.

In the present invention, the receiving device may be configured such that the receiving device further includes a mode setting section configured to allow the user to set one of the automatic mode, the sRGB mode, the sYCC mode, and the Adobe RGB mode, the color The space information indicates the sRGB, sYCC or AdobeRGB color space, and when the automatic mode is set by the mode setting section, the control section sets the color space as the color space indicated by the color space information, and when the automatic mode is set by the mode setting section In sRGB mode, sYCC mode, or Adobe RGB mode, the control section sets the color space to the color space corresponding to the setting mode. Through this configuration, by setting one of the sRGB mode, sYCC mode and Adobe RGB mode, the user can forcibly set the color space to sRGB, sYCC or Adobe RGB color space.

In the present invention, for example, the reception device may be configured such that the quantization range information indicates the full range or the limited range and the control section sets the quantization range for the image signal as the quantization range indicated by the quantization range information. This makes it possible to set the quantization range for the image signal to an optimized quantization range suitable for the image signal.

In the present invention, the receiving apparatus may be configured such that it further includes a mode setting section configured to allow the user to set one of an automatic mode, a full range mode, and a limited range mode, the quantized range information indicates the full range or the limited range, and when the automatic mode is set by the mode setting section, the control section sets the quantization range for the image signal as the quantization range indicated by the quantization range information, and when the automatic mode is set by the mode setting section When the full-range mode or the limited-range mode is set, the control section sets the quantization range for the image signal to a quantization range corresponding to the set mode. With this configuration, by setting one of the full range mode and the limited range mode, the user can forcibly set the quantization range for the image signal to the full range or the limited range.

In the present invention, the receiving apparatus can be configured so that quantization range information of the image signal whose definition is responsive to the content The type of content indicated by the information is identified, and the control section controls the operation of the display processing section based on the content identification information and quantization range information inserted into a blank period of the image signal received by the receiving section. As a result, the operation of the display processing section changes depending on what content the received image signal relates to, and an image can be displayed with an optimized level suitable for the type of content.

In the present invention, for example, the receiving device may further include: a tuner for receiving a broadcast signal; and a switcher for selectively supplying an image signal received by the tuner or an image received by the receiving section to the display processing section Signal. In this instance, not only an image based on the image signal received by the receiving section but also an image based on the image signal received by the tuner can be displayed.

In the present invention, for example, the reception device may be configured such that the display processing section includes an OSD section and the control section controls the OSD section so that the OSD displays the type of content indicated by the content identification information or the type of color space indicated by the color space information. In this instance, the user can easily recognize the type of content or the type of color space based on the OSD display.

In the present invention, for example, the reception device may be configured such that the display processing section includes the OSD section and the control section controls the OSD section so that when the color space indicated by the color space information is not supported, the OSD displays a color space not supported. In this instance, the user can easily recognize based on the OSD display that an image signal of a color space not supported by the receiving device has been transmitted from the transmitting side to the receiving device.

Another concept of the present invention lies in the receiving device, characterized in that the receiving device comprises:

a receiving section configured to receive an image signal of predetermined content having content identification information for identifying a type of content,

a display processing section configured to perform processing for display on the image signal received by the receiving section, and

A control section configured to control the operation of the display processing section based on the content identification information that the image signal received by the receiving section has.

In the present invention, an image signal of a predetermined content having content identification information for identifying a type of content is received by the receiving section. For example, content identification information is inserted in a blank period of an image signal. Also, for example, the content identification information includes information of a compression method of an image signal.

Then, the display processing section performs processing for display such as outline emphasis on the received image signal. In this instance, the control section controls the operation of the display processing section based on the content identification information that the image signal received by the reception section has. As a result, the operation of the display processing section changes depending on what content the received image signal relates to, and optimization processing is performed on the image signal.

In the present invention, for example, the reception device may be configured such that the reception section receives a compressed image signal input to an input terminal such as a USB terminal and the control section controls the display processing section so that when the image signal received by the reception section is a JPEG file , to perform still picture processing on the image signal. In this example, the image signal is an image signal of still picture content, and the display processing section performs optimized processing on the image signal.

In the present invention, for example, the reception device may be configured such that the reception section receives compressed image signals input to the USB terminal and the control section controls the display processing section so that when the image signal received by the reception section is a JPEG file and is included in the markup of the JPEG file When a specific manufacturer code is included, still picture processing is performed on the image signal. In this example, the image signal is an image signal of still picture content, and the display processing section performs optimized processing on the image signal.

According to the present invention, an image signal in which content identification information for identifying the type of content is inserted is transmitted, and on the receiving side, optimization processing suitable for the type of content can be performed on the image signal based on the content identification information.

Description of drawings

FIG. 1 is a block diagram showing a configuration example of an AV system as an embodiment.

2 is a block diagram showing an example of a specific configuration of a display processing section and a display section of a display unit.

FIG. 3 is a block diagram showing an example of the configuration of an HDMI source and an HDMI sink.

FIG. 4 is a block diagram showing an example of the configuration of an HDMI transmitter and an HDMI receiver.

FIG. 5 is a view illustrating the structure of TMDS transmission data.

FIG. 6 is a timing diagram illustrating control bits CTL0 and CTL1 and a relationship between a data island interval and a control interval.

Fig. 7 is a view illustrating the data structure of an AVI InfoFrame packet.

FIG. 8 is a view illustrating a correspondence relationship between content identification information placed in an AVI InfoFrame packet and a control type.

FIG. 9 is a flowchart illustrating an example of control based on content identification information on the receiving side.

FIG. 10 is a flowchart illustrating another example of control based on content identification information on the receiving side.

11 is a view showing a GUI screen image displayed on a liquid crystal panel when a mode is set for an automatic mode, a video (moving picture) mode, a photo (still picture) mode, a text mode, a movie mode, and a game mode.

Fig. 12 is a block diagram showing an example of the configuration of an AV system as another embodiment.

Fig. 13 is a block diagram showing an example of the configuration of cameras constituting the AV system.

Fig. 14 is a block diagram showing an example of the configuration of a television receiver constituting an AV system.

FIG. 15 is a block diagram showing an example of a specific configuration of a display processing section and a display section of the television receiver.

FIG. 16 is a view illustrating a data structure of a color space data block (Colorimetory data block) as E-EDID.

FIG. 17 is a view illustrating a data structure of a video capability data block (video capability (Capability) data block) as E-EDID.

Fig. 18 is a flowchart illustrating an example of setting processing of the control section of the video camera when setting a color space and a quantization range.

Fig. 19 is a view illustrating the data structure of an AVI InfoFrame packet.

FIG. 20 is a view illustrating an example of definitions of color space information and quantization range information depending on content.

FIG. 21 is a flowchart illustrating an example of control on the receiving side based on content identification information and the like.

FIG. 22 is a view showing an example of the content displayed on the screen of the liquid crystal panel and the color space of the OSD display.

FIG. 23 is a flowchart illustrating another example of control on the receiving side depending on content identification information and the like.

24 is a view showing a GUI screen image displayed on a liquid crystal panel when a mode is set for an automatic mode, a video (moving picture) mode, a photo (still picture) mode, a text mode, a movie mode, and a game mode.

Fig. 25 is a flowchart illustrating an example of control depending on color space information on the receiving side.

FIG. 26 is a view showing a GUI screen image displayed on a liquid crystal panel when a mode is set for an automatic mode, an sRGB mode, an sYCC mode, and an Adobe RGB mode.

Fig. 27 is a flowchart illustrating an example of control depending on the quantization range information receiving side.

FIG. 28 is a view showing a GUI screen image displayed on a liquid crystal panel when a mode is set for an automatic mode, a full range mode, and a limited range mode.

Fig. 29 is a view illustrating the configuration of SPD InfoFrame.

FIG. 30 is a view illustrating a configuration of sources, devices, and information.

FIG. 31 is a flowchart illustrating an example depending on control on the content identification information receiving side.

FIG. 32 is a flowchart illustrating another example of control on the receiving side depending on content identification information and the like.

33 is a view showing a GUI screen image displayed on a liquid crystal panel at the time of mode setting for an automatic mode, a video (moving picture) mode, and a photo (still picture) mode.

Fig. 34 is a block diagram showing an example of the configuration of an AV system as another embodiment.

40...AV system, 41...HD recorder, 42...display unit, 43...HDMI cable, 51...recording and reproduction section, 52...codec, 53... HDMI source, 54...HD, 55...external device, 61...HDMI sink, 62...display processing part, 62a...chroma decoder, 62b...DRC part, 62c. ..enhancer, 62d...panel driver, 63...display section, 63a...LCD panel, 63b...backlight, 71...source signal processing section, 72...HDMI transmitter, 81 ...HDMI receiver, 82...collection signal processing section, 140...AV system, 141...camera, 142...television receiver, 143...HDMI cable, 151...control section , 152 ... user operation section, 153 ... display section, 154 ... image pickup lens, 155 ... image pickup element, 156 ... picked up image signal processing section, 157 ... codec , 158...Recording and reproduction section, 159...HD, 160...HDMI source, 161...External device, 171...Control section, 172...User operation section, 174...Tuning Device, 175...Antenna terminal, 176...Switcher, 177...Display processing part, 177a...Chroma decoder, 177b...DRC part, 177c...Enhancer, 177d.. .Panel driver, 178...Display part, 178a...LCD panel, 178b...Backlight, 180...AV system, 181...Camera, 181a, 182...USB terminal, 182... TV receiver, 183...USB cable

Detailed ways

Hereinafter, embodiments of the present invention are described with reference to the drawings.

FIG. 1 shows an example of the configuration of an AV system 40 to which the present invention is applied. Referring to FIG. 1, the AV system includes an HD (Hard Disk) recorder 41 as a transmitting device and a display unit 42 as a receiving device. The HD recorder 41 and the display unit 42 are connected to each other by a cable 43 for HDMI.

The HD recorder 41 has a recording and reproducing section 51, a codec 52, an HDMI source 53, and an HD 54, and performs recording of data on the HD 54 and reproduction of data from the HD 54. Specifically, the recording and reproducing section 51 records, on the HD 54, supplied from the codec 52, encoded image data (image signal) and sound data associated with the image data, for example, in accordance with the MPEG (Moving Picture Experts Group) system or the like. (sound signal) obtained encoded data. Furthermore, the recording and reproducing section 51 reproduces (reads out) encoded data from the HD 54 and supplies the encoded data to the codec 52.

The codec 52 decodes the encoded data supplied thereto from the recording and reproducing section 51 into baseband (uncompressed form) image and sound data in accordance with the MPEG system or the like and supplies the HDMI source 53 and the external device 55 with Provides image and sound data for this baseband. Furthermore, the codec 52 encodes baseband image and sound data supplied thereto from the external device 55 into encoded data and supplies the encoded data to the recording and reproducing section 51 . Here, the external device 55 is a different HD recorder, personal computer, DVD (Digital Versatile Disc) player, digital camera, or the like.

The HDMI source 53 unidirectionally transmits the baseband image and sound data supplied from the codec 52 to the display unit 42 through the cable 43 by communication complying with HDMI. In this sense, the HDMI source 53 forms a transmission section. Further, the HDMI source 53 inserts content identification information identifying the content type of the image data to be transmitted (ie, what kind of content the image data relates to) in a blank period of the image data to be transmitted (image signal). In this sense, the HDMI source 53 forms an identification information insertion section. Details of this content identification information are described below.

The display unit 42 has an HDMI receiver 61, a display processing section 62, a display section 63, and a control section 64, and performs display of images and the like. Specifically, the HDMI receiver 61 receives baseband image and sound data to which the HDMI source 53 of the HD recorder 41 is unidirectionally transmitted, connected through the HDMI-compliant communication cable 43 . In this sense, the HDMI receiver 61 forms a receiving section.

The HDMI receiver 61 supplies the received image data to the display processing section 62 . Note that the sound data received by the HDMI receiver 61 is supplied to an unknown speaker built in the display unit 42, for example. Sound is output from the speaker based on the received sound data.

The display processing section 62 performs processing such as outline emphasis for display on the image data received by the HDMI receiver 61 . The display section 63 displays an image based on the image data processed by the display processing section 62 . The display section 63 is formed of, for example, an LCD (Liquid Crystal Display) unit, an organic EL (Electro Luminescence) unit, a CRT (Cathode Ray Tube), or the like. The control section 64 controls operations of the display processing section 62 and the display section 63 . In the present embodiment, content identification information is inserted in the blank period of the above-mentioned image data from the HDMI receiver 61 . The control section 64 controls the operations of the display processing section 62 and the display section 63 based on the content identification information in response to the type of content of the image data received by the HDMI receiver 61 .

FIG. 2 shows an example of specific configurations of the display processing section 62 and the display section 63 . Referring to FIG. 2, the display processing section 62 includes a chroma decoder 62a, a DRC (Digital Reality Creation) section 62b, an enhancer 62c, and a panel driver 62d.

The chroma decoder 62 a performs color-related processing such as changing a color space on the image data supplied thereto from the HDMI receiver 61 . The chroma decoder 62a forms a color space changing section. The DRC section 62b performs processing for improving picture quality on the image data output from the chroma decoder 62a. In this instance, for example, the DRC section 62b regenerates pixel data of a pixel of interest in response to a pattern of peripheral pixel data including peripherals to perform picture quality improvement. The DRC section 62b forms a picture quality improvement section.

The enhancer 62c performs processing of edge enhancement on the image data output from the DRC section 62b. This enhancer 62c forms a contour-emphasized portion. The panel driver 62d drives the liquid crystal panel 63a, which constitutes the display section 63 described below, based on the image data output from the intensifier 62c. The panel driver 62d also performs gamma correction. The panel driver 62d forms a gradation changing section.

In addition, referring to FIG. 2, the display portion 63 includes a liquid crystal panel 63a and a backlight 63b. The liquid crystal panel 63a is driven by the panel driver 62d described above to display an image based on image data. The backlight 63b is formed of, for example, a white fluorescent tube.

An example of the operation of the AV system 40 of FIG. 1 configured in the above-described manner will be described.

For example, if the HD recorder 41 is operated so as to reproduce the HD 54 (in FIG. 1 , the user operation part is not shown), the recording and reproducing section 51 reproduces encoded data from the HD 54 and supplies the reproduced encoded data to the codec 52 . The codec 52 decodes encoded data supplied thereto from the recording and reproducing section 51 into baseband image and sound data and supplies the baseband image and sound data to the HDMI source 53 .

The HDMI source 53 inserts content identification information in blank periods of the image data supplied thereto from the codec 52 . Then, the HDMI source 53 unidirectionally transmits, to the display unit 42, the image data of the baseband supplied thereto from the codec 52 and the sound data of the baseband, which have a space in its blank, to the display unit 42 through the HDMI cable 43 complying with HDMI communication. Content-identifying information is inserted into the period.

In the display unit 42 , the HDMI receiver 61 receives image and sound data of the baseband to which the HDMI source 53 of the HD recorder 41 is unidirectionally transmitted, connected through the HDMI cable 43 of communication complying with HDMI. Then, the HDMI receiver 61 supplies the image data to the display processing section 62 and supplies the sound data to a speaker not shown. Furthermore, the HDMI receiver 61 supplies the control section 64 with a control signal inserted in a blank period of the image data, for example, content identification information.

The display processing section 62 performs processing suitable for the type of content of the image data on the image data under the control of the control section 64 and supplies the processed image data to the display section 63 . The display section 63 displays an image based on the image data supplied thereto from the display processing section 62 .

FIG. 3 shows an example of the configuration of the HDMI source 53 and the HDMI sink 61 of FIG. 1 .

The HDMI source 53 unidirectionally transmits one screen for baseband (in uncompressed form) to the HDMI sink 61 over multiple channels within an active picture interval (hereinafter appropriately referred to as the "active video interval") differential signal of image data for an image, the effective image interval is obtained by removing horizontal blanking periods and vertical blanking intervals from one vertical sync signal to the next (hereinafter appropriately referred to as a "video field") The interval at which time slots are obtained. Furthermore, the HDMI source 53 unidirectionally transmits audio data and control packets (control packets) corresponding to image data associated with the image data and other auxiliary data, etc., to the HDMI receiver 61 through a plurality of channels during the horizontal blank period and the vertical blank period differential signal.

The HDMI source 53 has a source signal processing section 71 and an HDMI transmitter 72 . The source signal processing section 71 is supplied from the codec 52 to the source signal processing section 71 , uncompressed data of images (video) and sound (audio) of the baseband, and the like (refer to FIG. 1 ). The source signal processing section 71 performs necessary processing on the image and sound data supplied thereto. Further, the source signal processing section 71 transmits control information, information for notifying status (control/status), and the like to or from the HDMI transmitter 72 as occasion demands.

The HDMI transmitter 72 converts the image data supplied from the source signal processing section 71 into corresponding differential signals and transmits to the HDMI receiver connected through the HDMI cable 43 through the three TMDS channels #0, #1, and #2 as a plurality of channels. Transmitter 61 unidirectionally transmits the differential signal.

In addition, the transmitter 72 transmits sound data, control packets, and other auxiliary data (auxiliary data) associated with uncompressed image data, and control data (control data) such as a vertical synchronization signal (VSYNC) and a horizontal synchronization signal (HSYNC). data) into corresponding differential signals and unidirectionally transmit the differential signals to the HDMI receiver 61 connected through the HDMI cable 43 through the three TMDS channels #0, #1, and #2.

Furthermore, the transmitter 72 transmits a pixel clock synchronized with image data transmitted through the three TMDS channels #0, #1, and #2 to the HDMI receiver 61 connected through the HDMI cable 43 through the TMDS clock channel.

The HDMI receiver 61 receives differential signals corresponding to image data unidirectionally transmitted thereto from the HDMI source 53 through a plurality of channels during an active video interval, and receives differential signals from the HDMI source 53 through a plurality of channels during a horizontal blank period and a vertical blank period. The HDMI source 53 transmits thereto differential signals corresponding to auxiliary data and control data.

The HDMI receiver 61 has an HDMI receiver 81 and a collection signal processing section 82 . The HDMI receiver 81 similarly receives a differential signal corresponding to image data and a differential signal corresponding to auxiliary data which are unidirectionally transmitted to the receiver 61 from the HDMI source 53 connected by the HDMI cable 43 through the TMDS channels #0, #1, and #2. and control data, which are synchronized with the pixel clock transmitted from the HDMI source 53 to the HDMI sink 61 through the TMDS clock channel. Furthermore, the HDMI receiver 81 converts these differential signals into corresponding image data, auxiliary data, and control data and supplies the resulting data to the aggregate signal processing section 82 as required from time to time.

The aggregate signal processing section 82 performs necessary processing on the data supplied thereto from the HDMI receiver 81, and supplies the processed data to the display processing section 62, the control section 64, and the like. Further, the aggregate signal processing section 82 transmits control information, information for notifying status (control/status), and the like to and from the HDMI receiver 81 as required from time to time.

Transmission channels of HDMI, except three TMDS channels #0, #1 and #2 and a TMDS clock channel which is a transmission channel for transmitting a pixel clock further include a DDC (Display Data Channel) and a transmission channel called a CEC line.

The DDC is used to read out E-EDID (Enhanced Extended Display Identification) from the HDMI receiver 61 to which the HDMI cable 43 is connected.

Specifically, the HDMI receiver 61 has an unillustrated EDID ROM (Read Only Memory) for storing E as information on the performance (configuration/capability) of the HDMI receiver 61 itself in addition to the HDMI receiver 81. -EDID. The HDMI source 53 reads out the E-EDID of the HDMI receiver 61 through DDC from the HDMI receiver 61 connected to the HDMI cable 43 and discriminates the setting of the performance of the HDMI receiver 61 based on the E-EDID, that is, for example, has the HDMI receiver 61 The format (profile) of the image compatible with the electronic device of 61, for example, RGB, YCbCr 4:4:4, YCbCr4:2:2 and so on.

Note: HDMI source 53 stores E-EDID similarly to HDMI sink 61 and may send E-EDID to HDMI sink 61 as required from time to time.

The CEC line is used to perform bidirectional communication of control data between the HDMI source 53 and the HDMI sink 61 .

FIG. 4 shows an example of configurations of the HDMI transmitter 72 and the HDMI receiver 81 of FIG. 3 .

The HDMI transmitter 72 has three encoders/serializers 72A, 72B, and 72C corresponding to the three TMDS channels #0, #1, and #2, respectively. In addition, the encoder/serializers 72A, 72B, and 72C each encode image data, auxiliary data, and control data supplied thereto, convert the encoded data from parallel data to serial data, and transmit the serial data as differential signals. . Here, image data therein has three components such as R (red), G (green), and B (blue), and the B component (B component) is supplied to the encoder/serializer 72A; the G component (G component) to encoder/serializer 72B; and the R component (R component) to encoder/serializer 72C.

Also, for example, sound data and control packets are used as auxiliary data, and for example, the control packets are supplied to the encoder/serializer 72A, and the sound data are supplied to the encoders/serializers 72B and 72C.

Also, a 1-bit vertical synchronization signal (VSYNC), a 1-bit horizontal synchronization signal (HSYNC), and 1-bit control bits CTL0 , CTL1 , CTL2 , and CTL3 are used as control data. The vertical synchronization signal and the horizontal synchronization signal are supplied to the encoder/serializer 72A. Control bits CTL0 and CTL1 are provided to encoder/serializer 72B, and control bits CTL2 and CTL3 are provided to encoder/serializer 72C.

The encoder/serializer 72A time-divisionally transmits the B component of the image data supplied thereto, the vertical synchronization signal and the horizontal synchronization signal, and auxiliary data. Specifically, the encoder/serializer 72A converts the B component of the image data supplied thereto into parallel data of 8-bit units which is a fixed number of bits. In addition, the encoder/serializer 72A encodes parallel data, converts the encoded parallel data into serial data, and transmits the serial data through TMDS channel #0.

Furthermore, the encoder/serializer 72A encodes 2-bit parallel data of the vertical synchronization signal and the horizontal synchronization signal supplied thereto, converts the encoded data into serial data and transmits the serial data through TMDS channel #0. Furthermore, the encoder/serializer 72A converts the auxiliary data supplied thereto into parallel data in units of 4 bits. Then, the encoder/serializer 72A encodes the parallel data, converts the encoded data into serial data and transmits the serial data through TMDS channel #0.

The encoder/serializer 72B time-divisionally transmits the G component of the image data supplied thereto, the control bits CTL0 and CTL1, and the auxiliary data. Specifically, the encoder/serializer 72B converts the G component of the image data supplied thereto into parallel data of 8-bit units which is a fixed number of bits. In addition, the encoder/serializer 72B encodes parallel data, converts the encoded data into serial data, and transmits the serial data through TMDS channel #1.

Also, the encoder/serializer 72B encodes 2-bit parallel data of the control bits CTL0 and CTL1 supplied thereto, converts the encoded data into serial data and transmits the serial data through the TMDS channel #1. Furthermore, the encoder/serializer 72B converts the auxiliary data supplied thereto into parallel data in units of 4 bits. Then, the encoder/serializer 72B encodes the parallel data, converts the encoded data into serial data and transmits the serial data through TMDS channel #1.

The encoder/serializer 72C time-divisionally transmits the R component of the image data supplied thereto, the control bits CTL2 and CTL3 , and the auxiliary data. Specifically, the encoder/serializer 72C converts the R component of the image data supplied thereto into parallel data of 8-bit units which is a fixed number of bits. In addition, the encoder/serializer 72C encodes parallel data, converts the encoded data into serial data, and transmits the serial data through TMDS channel #2.

Also, the encoder/serializer 72C encodes 2-bit parallel data of the control bits CTL2 and CTL3 supplied thereto, converts the encoded data into serial data and transmits the serial data through the TMDS channel #2. Furthermore, the encoder/serializer 72C converts the auxiliary data supplied thereto into parallel data in units of 4 bits. Then, the encoder/serializer 72C encodes the parallel data, converts the encoded data into serial data and transmits the serial data through TMDS channel #2.

The HDMI receiver 81 has three recovery/decoders 81A, 81B, and 81C respectively corresponding to the three TMDS channels #0, #1, and #2. Furthermore, the restoration/decoders 81A, 81B, and 81C each receive image data, auxiliary data, and control data transmitted thereto in the form of differential signals through the TMDS channels #0, #1, and #2. Furthermore, the restoration/decoders 81A, 81B, and 81C each convert image data, auxiliary data, and control data from serial data to parallel data, decode the parallel data, and output the decoded data.

Specifically, the recovery/decoder 81A receives the B component of the image data, the vertical synchronization signal and the horizontal synchronization signal, and auxiliary data transmitted thereto in the form of differential signals through the TMDS channel #0. Then, the restoration/decoder 81A converts the B component of the image data, the vertical synchronization signal and the horizontal synchronization signal, and auxiliary data from serial data to parallel data, decodes the parallel data, and outputs the decoded data.

The recovery/decoder 81B receives the G component of the image data, the control bits CTL0 and CTL1, and the auxiliary data transmitted thereto in the form of a differential signal through the TMDS channel #1. Then, the restoration/decoder 81B converts the G component of the image data, the control bits CTL0 and CTL1 , and auxiliary data from serial data to parallel data, decodes the parallel data, and outputs the decoded data.

The restoration/decoder 81C receives the R component of the image data, the control bits CTL2 and CTL3, and the auxiliary data transmitted thereto in the form of a differential signal through the TMDS channel #2. Then, the restoration/decoder 81C converts the R component of the image data, the control bits CTL2 and CTL3 , and auxiliary data from serial data to parallel data, decodes the parallel data, and outputs the decoded data.

FIG. 5 illustrates an example in which various transmission data are transmitted through three TMDS channels #0, #1, and #2 of HDMI within a transmission interval (period). Note: In TMDS channels #0, #1, and #2, FIG. 5 illustrates intervals of various transmission data in a case where a progressive image of 720×480 pixels in the horizontal×vertical direction is transmitted.

In the video field (video field) in which transmission data is transmitted through the three TMDS channels #0, #1, and #2 of HDMI, there are three different intervals depending on the type of transmission data: video data interval (video data period ), data slice interval (data slice period) and control interval (control period).

Here, the video field interval is the interval from the rising edge (active edge) of a certain vertical synchronizing signal to the rising edge of the next vertical synchronizing signal, and is divided into a horizontal blank period (horizontal blank), a vertical blank period (vertical blank) and the active video interval (active video), where the active video interval is the period obtained by removing the horizontal blank period and the vertical blank period from the video field period.

Assign video data intervals to active video intervals. In this video data interval, data of effective pixels (active pixels) of 720 pixels×480 lines forming image data of one screen image in an uncompressed state is transmitted.

The data slice interval and the control interval are assigned to the horizontal blanking period and the vertical blanking period. In the data slice interval and the control interval, auxiliary data (ancillary data) is transmitted.

Specifically, the data slice interval is allocated to a part of the horizontal blanking period and the vertical blanking period. In the data slice interval, packets of data not related to control among the auxiliary data, such as, for example, voice data, are transmitted.

Assign control intervals to the horizontal blanking period and other parts of the vertical blanking period. In the control interval, data related to control among the auxiliary data, for example, a vertical synchronization signal and a horizontal synchronization signal, a control packet, and the like are transmitted.

Here, according to the existing HDMI, the frequency of the pixel clock transmitted by the TMDS clock channel is, for example, 165Mhz, and in this example, the transmission rate in the data slice interval is close to 500Mbps.

Although auxiliary data is transmitted in both the data slice interval and the control interval as described above, distinction between them is performed based on the control bits CTL0 and CTL1. Specifically, FIG. 6 illustrates the relationship between the control bits CTL0 and CTL1 and the data slice interval and the control interval. Note: At the top of Figure 6, the H (high) level indicates the enabled state of the device, and the L (low) level indicates the disabled (disable) state of the device. The control bits CTL0 and CTL1 exhibit the device disabled state during the data slice interval and the device enabled state during the control period, and thus, distinguish the data slice interval and the control interval from each other.

Then, within the data slice interval in which the control bits CTL0 and CTL1 exhibit the L level as the device disable state, as seen in the second part (second top) in FIG. sound data and more. On the other hand, in the control interval in which the control bits CTL0 and CTL1 exhibit the H level as the equipment enable state, as seen in the third part in FIG. 6, data related to control among auxiliary data such as control packets, Preamble (preamble) and so on. In addition, as seen in the fourth part of FIG. 6, a vertical synchronization signal and a horizontal synchronization signal are also transmitted in the control interval.

Now, a description is given of the content identification information to be inserted in the blank period of the image data (image signal) by the HDMI source 53 of the HD recorder 41 as described above.

FIG. 7 illustrates the data structure of the above-mentioned AVI (Auxiliary Video Information) InfoFrame packet placed in the data slice interval. In HDMI, AVI InfoFrame packets can be used to send associated information about an image from a source device to a sink device.

In this embodiment, as can be seen from the data structure of the AVI InfoFrame illustrated in FIG. 7 , the content identification information is placed hierarchically in 1 bit of the ITC of the sixth byte (data byte 3) and In the 2 bits of CT1 and CT0 of the eighth byte (data byte 5).

The ITC, which is 1-bit data, is for identifying whether the content is dynamic screen content. Here, if ITC=0, this indicates that the content is normal dynamic picture content, and if ITC=1, this indicates that the content is not normal dynamic picture content. CT1 and CT0 which are 2-bit data are valid when ITC=1. In other words, when it is determined based on the ITC that the content is not a normal dynamic picture content, CT1 and CT0 are further used.

In this embodiment, as seen in FIG. 8, CT1 and CT0 make it possible to recognize four kinds of content: text content, photo (still picture) content, movie content, and game content. Specifically, when CT1=0 and CT0=0, it indicates that the content is text content. When CT1=0 and CT0=1, it indicates that the content is photo content. When CT1=1 and CT0=0, it indicates that the content is movie content. When CT1=1 and CT0=1, it indicates that the content is game content.

Here, text content means popular IT (Information Technology) content. The photo content means the content of a still picture. The movie content means the contents of a movie or a home video. The game content means the content of the PC or game console video.

Now, an example of control processing of the control section 64 of the display unit 42 in which content identification information including the 1-bit data (ITC) and 2-bit data described above is used is described with reference to the flowchart of FIG. 9 . data (CT1 and CT0).

The control section 64 first starts the control process at step ST1 and then advances the process to step ST2. In step ST2, the control section 64 judges whether or not ITC=1 is satisfied. If ITC=1 is not satisfied, the control section 64 recognizes the received image data as data of normal dynamic picture content, and performs normal dynamic picture processing at step ST3.

Specifically, the control section 64 controls the chroma decoder 62a to set a color space for a dynamic picture, for example, an sRGB color space. Furthermore, the control section 64 controls the DRC section 62b to execute picture quality improvement processing. Also, the control section 64 controls the enhancer 62c to emphasize high-frequency components to perform contour emphasis. Furthermore, the control section 64 controls the panel driver 62d to perform ordinary gamma correction. Furthermore, the control section 64 controls the backlight 63b to exhibit an ordinary color temperature.

When it is judged at step ST2 that ITC=1, the control section 64 advances the process to step ST4. In step ST4, the control section 64 judges whether or not CT1=0 is satisfied. Then, if CT1=0 is satisfied, the control section 64 judges in step ST5 whether CT0=0 is satisfied.

If CT0=0 is satisfied, the control section 64 recognizes that the received data relates to text content, and executes text (text) processing at step ST6. In this instance, the control section 64 controls the operation of the enhancer 62c so that the enhancer 62c does not perform contour emphasis that emphasizes high-frequency components. Note: Similar to the normal dynamic picture processing described above, the control section 64 controls the chrominance decoder 62a, the DRC section 62b, the panel driver 62d, and the backlight 63b.

In this way, when the received image data relates to text content, by controlling the enhancer 62c so that outline emphasis is not performed, it is possible to prevent a situation where characters are difficult to read due to outline emphasis.

On the other hand, if CT0 = 0 is not satisfied at step ST5, the control section 64 recognizes that the received image data relates to photo content, and performs photo (photograph) processing at step ST7. In this example, the control section 64 controls the operation of the chroma decoder 62a so that a color space for a still picture, for example, an Adobe (Adobe's trademark) RGB color space can be selected by the chroma decoder 62a. Note: Similar to the general dynamic picture processing described above, the control section 64 controls the DRC section 62b, the enhancer 62c, the panel driver 62d, and the backlight 63b.

In this way, when the received image data relates to photo content, if the enhancer 62c sets the color space as the color space for still pictures, images based on photo (still picture) content can be advantageously displayed using the still picture color space. An image of the image data.

On the other hand, if CT1=0 is not satisfied at step ST4, the control section 64 determines whether CT0=0 is satisfied at step ST8.

If CT0=0 is satisfied, the control section 64 recognizes that the received image data relates to movie content and executes movie (movie) processing in step ST9. In this example, the control section 64 controls the gamma correction of the panel driver 62d to raise the gradation on the black side and controls the backlight 63b to lower the color temperature. Note: The control section 64 controls the chrominance decoder 62a, the DRC section 62b, and the enhancer 62c similarly in the above-mentioned ordinary dynamic picture processing.

In this way, if the received image data relates to movie content, the panel driver 62d raises the level of the black side and lowers the color temperature of the backlight 63b so that an image conforming to the movie content can be displayed.

On the other hand, if CT0=0 is not satisfied at step ST8, the control section 64 recognizes that the received image data relates to game content and executes game (game) processing at step ST10. In this instance, the control panel 64 controls the operation of the DRC section 62b so that the DRC section 62b does not perform image improvement processing. Note: The control section 64 controls the chrominance decoder 62a, the enhancer 62c, the panel driver 62d, and the backlight 63b similarly in the above-mentioned ordinary dynamic picture processing.

In this way, if the received image data relates to game content, since the DRC section 62b is prevented from performing the picture quality improvement process, it is possible to moderate the delay of the picture with respect to the sound caused by the picture quality improvement process, and it is possible to prevent the sound and sound from occurring. Unfamiliar feeling caused by displacement between images.

Now, another example of the control process of the control section 64 of the display unit 42 in which content identification information including the 1 bit data (ITC) and 2-bit data (CT1 and CT0). In FIG. 10, steps corresponding to those of FIG. 9 are denoted by the same reference numerals.

The control section 64 first starts the control process at step ST1 and then advances the process to step ST1a. In step ST1a, the control section 64 determines which of the automatic mode, video (moving picture) mode, photo (still picture) mode, text mode, movie mode, and game mode the set mode is.

Note: The control section 64 is provided on a user operation section not shown, and the user can operate the user operation section to perform mode setting. FIG. 11 shows a screen image of a GUI (Graphical User Interface) about mode setting displayed on the liquid crystal panel 63a. The user can set by operating the user operation part to press a button for automatic mode, video (moving picture) mode, photo (still picture) mode, text mode, movie mode or game mode displayed on the GUI screen image desired pattern.

If the setting mode is the automatic mode at step ST1a, the control section 64 advances the processing to step ST2, where the control section 64 executes the processing and the like in the flowchart described above with reference to FIG. a detailed description of . On the other hand, if the mode set at step ST1a is one of video mode, photo mode, text mode, movie mode, and game mode, the control section 64 advances the process to step ST1b. In step ST1b, the control section 64 executes processing (moving picture processing, text processing, photo processing, movie processing, or game processing) corresponding to the set mode (refer to ST3, ST6, ST7, ST9 or ST10).

In the example of the control processing illustrated in the flowchart of FIG. 10 , when the setting mode is the automatic mode, similarly to the example of the control processing illustrated in the flowchart of FIG. 9 , the received image data ( image signal) performs optimized processing depending on the type of content. Also, in the example of the control processing illustrated in the flowchart of FIG. 10, if the set mode is one of video (moving picture) mode, photo (still picture) mode, text mode, movie mode, and game mode type, the processing suitable for the set mode is forcibly performed on the received image data (image signal).

As described above, in the AV system 40 shown in FIG. 1, the HDMI source 53 of the HD recorder 41 inserts content identification information ITC, CT1, and CT0, and transmits image data to the HDMI receiver 61 of the display unit 42 in the form of differential signals through three TMDS channels #0, #1, and #2. Accordingly, the display unit 42 can identify the type of content of the received image data based on the content identification information and perform optimization processing on the image data depending on the content type.

Furthermore, in the AV system 40 shown in FIG. 1, the content identification information inserted by the HDMI source 53 of the HD recorder 41 in the blank period of the image data is composed of 1-bit data ITC and 2-bit data CT1 and Formed by CT2, the 1-bit data ITC is used to identify whether the content is a common dynamic picture content, and the 2-bit data CT1 and CT2 are used when judging that the content is not a dynamic picture content. In this example, if the transmission frequency of ordinary dynamic picture content is high, only the determination process of the content type in which 1-bit data ITC placed on a higher-level layer (layer) is used is frequently performed, and the pass It becomes possible for the control section 64 of the display unit 42 to reduce the load of the determination processing.

Note: In the above-mentioned embodiment, as content identification information, 1-bit data ITC is placed on a higher-level layer and 2-bit data CT1 and CT0 are placed on a lower-level layer so that five different Content, including ordinary dynamic picture content, text content, photo content, movie content and game content. However, it is also possible to identify a greater number of different contents by increasing the number of data bits in each level of layers, increasing the number of levels of layers, and the like. In addition, the classification of five different contents of general moving picture content, text content, photo content, movie content, and game content is an example and not limited thereto.

Furthermore, in the above-described embodiment, although it was described that the content identification information ITC, CT1, and CT0 are inserted in the AVI InfoFrame packet placed in the blank period of the image data, the content may be inserted in other parts of the blank period of the image data. identifying information.

Now, another embodiment of the present invention is described.

FIG. 12 shows an example of the configuration of an AV system 140 to which the present invention is applied. Referring to FIG. 12, an AV system 140 includes a video camera 141 as a transmitting device and a television receiver 142 as a receiving device. The video camera 141 and the television receiver 142 are connected to each other by a cable 143 for HDMI.

FIG. 13 shows an example of the configuration of the camera 141 . This video camera 141 has a control section 151, a user operation section 152, a display section 153, an image pickup lens 154, an image pickup element (image sensor) 155, a processing section 156 of a picked-up image signal, a codec 157, a recording and reproducing section 158 and HDMI source 160.

The control section 151 controls operations of components of the camera 141 . The user operation section 152 and the display section 153 form a user interface and are connected to the control section 151 . The user operation section 152 is formed of keys, buttons, and dials arranged on a housing (not shown) of the camera 141 or a touch panel or the like arranged on a display face of the display section 153 . The display section 153 is formed of an LCD (Liquid Crystal Display) unit or the like.

The image pickup element 155 is formed of, for example, a CCD (Charge Coupled Device) image sensor, a CMOS (Complementary Metal Oxide Semiconductor) image sensor, or the like. The image pickup element 155 performs image pickup processing and outputs a picked up image signal in a state where an optical image of the image pickup object is formed on the image pickup surface by the image pickup lens 154 .

The picked-up image signal processing section 156 performs sample-hold and gain control, conversion from analog signal to digital signal, white balance adjustment, gamma correction, etc., on the picked-up image signal (analog signal) output from the image pickup element 155 to generate Image data (image signal). Note: The user can designate the color space of the image data to be output from the picked-up image signal processing section 156 through the user operation section 152 . Specifically, the user can designate an RGB color space (eg, sRGB 601, sRGB709, Adobe 601, Adobe 709, etc.) or a YUV color space (eg, sYCC 601, sYCC 709, etc.).

Furthermore, the user can designate the quantization range of the image data to be output from the picked-up image signal processing section 156 through the user operation section 152 . Specifically, the user can specify the range of the luminance (luminance) signal Y of the image data in the YUV color space (for example, the full range (0 to 255), or the limited range (16 to 235)) or the range of the color signal in the RGB color space. Quantized range (for example, full range (0 to 255), or limited range (16 to 235)).

The HDMI source 160 reads out the E-EDID of the HDMI receiver 173 from the HDMI receiver 173 of the television receiver 142 described later using DDC through the HDMI cable 143 . The E-EDID read out by the HDMI source 160 in this manner includes information of the color space and quantization range supported by the television receiver 142 (ie, the television receiver can handle). The control section 151 can control the display section 153 to display the color space and quantization range supported by the television receiver 142 based on the information. In this example, the user can designate any color space and any quantization range supported by the television receiver 142 simply by referring to the color space and quantization range displayed on the display section 153 .

Note: In this example, by allowing the user to designate a desired color space and a desired quantization range only from the color space and quantization range instead of the color space and quantization range displayed on the display section 153, it is possible to avoid the user from Designation of a color space not supported by the television receiver 142 on the receiving side is performed. Furthermore, instead of specifying the color space and quantization range by the user as described above, the control section 151 may automatically select a predetermined color space and quantization range from those supported by the television receiver 142 . In this example, since the color space and quantization range supported by the television receiver 142 on the receiving side are automatically set, the labor of the user can be reduced. Note: In this example, the control section 151 forms a setting section for the color space and the quantization range.

FIG. 16 illustrates an example of a data structure of a color space data block (colorimetric data block) as E-EDID. In the fifth to seventh bits of the first byte, "label code (07h)" for indicating that the data block is a type using an extended label code (extended label code) is described. In the zeroth to fourth bits of the first byte, "the length of the following data block (byte) (03h)" for indicating the length of the data block is described. In the second byte, an extended tag code "extended tag code (05h)" for indicating that the block is a color space block is described.

In the third byte and the fourth byte, actual data is described. The zeroth bit (F30) of the third byte indicates whether the color space of "xvYCC 601" is supported. The first bit (F31) of the third byte indicates whether the color space of "xvYCC 709" is supported. The second bit (F32) of the third byte indicates whether the color space of "sYCC 601" is supported. The third bit (F33) of the third byte indicates whether the color space of "sYCC 709" is supported.

The fourth bit (F34) of the third byte indicates whether the "Adobe 601" color space is supported. The fifth bit (F35) of the third byte indicates whether the "Adobe 709" color space is supported. The sixth bit (F36) of the third byte indicates whether the color space of "Adobe RGB" is supported. Each bit indicates a supported color space, ie, when the bit is "1", the color space can be processed.

FIG. 17 illustrates an example of the data structure of a video capability data block (video capability (Capibility) data block) as E-EDID. In the fifth to seventh bits of the first byte, "label code (07h)" for indicating that the data block is a type using an extended label code (extended label code) is described. In addition, in the zeroth to fourth bits of the first byte, "the length of the following data block (byte) (02h)" indicating the length of the data block is described. In the second byte, an extended tag code "extended tag code (00h)" for indicating that the block is a video capability block is described.

In the third byte, actual data is described. The seventh bit (F37) of the third byte describes whether the full range of data QY can be processed in the YUV space. When QY=1, this means that the full range is supported, ie, the full range can be processed.

The flowchart of FIG. 18 illustrates an example of setting processing of the control section 151 when setting a color space and a quantization range. The control section 151 first starts the setting process in step ST21 and then advances the process to step ST22. In step ST22 , the control section 151 displays the color space and quantization range supported by the television receiver (receiver) 142 on the display section 153 based on the color space and quantization range information (EDID) obtained from the television receiver 142 .

Then in step ST23, the control section 151 judges whether the user has designated a color space and a quantization range. If the user has designated the color space and quantization range through the user operation section 152, the control section 151 sets the color space and quantization range of the image data output from the picked-up image signal processing section 156 to the designated color space and quantization range in step ST24. quantization range. Thereafter, the control section 151 ends the setting process in step ST26.

If in the above-mentioned step ST23, the user has not designated the color space and the quantization range, the control section 151 automatically sets the color space and the quantization range to one from the color space and the quantization range supported by the television receiver 142 in step ST25. Predetermined color space and quantization range. Thereafter, the control section 151 ends the setting process in step ST26.

Referring back to FIG. 13 , the recording and reproducing section 158 converts encoded data obtained from encoded image data (image signal) and sound data (sound signal) associated with the image data supplied from the codec 157 through, for example, MPEG ( Moving Picture Experts Group) system, etc. are recorded on the HD 159. Further, the recording and reproducing section 158 reproduces (reads out) encoded data from the HD 159 and supplies the encoded data to the codec 157.

The codec 157 decodes the encoded data supplied thereto from the recording and reproducing section 158 into baseband (uncompressed state) image and sound data in accordance with the MPEG system or the like and supplies the baseband image and sound data to the HDMI source 160 and the external device 161. image and sound data. Further, the codec 157 encodes baseband image and sound data supplied thereto from the picked-up image signal processing section 156 or from the external device 161 into encoded data and supplies the encoded data to the recording and reproducing section 158 . Here, the external device 161 is an HD recorder, a personal computer, a DVD (Digital Versatile Disc) player, a digital camera, or the like.

The HDMI source 160 transmits the baseband image and sound data unidirectionally supplied thereto by the codec 157 to the television receiver 142 through the cable 143 of HDMI-compliant communication. In this sense, the HDMI source 160 forms a sending part. Furthermore, the HDMI source 160 inserts content identification information identifying the content type of the image data to be transmitted (ie, identifying what content the image data relates to) in a blank period of the image data to be transmitted (image signal). In this sense, the HDMI source 160 forms an identification information insertion section. Although detailed description is omitted, the HDMI source 160 is formed similarly to the HDMI source 53 of the HD recorder 41 of the AV system 40 of FIG. 1 described above.

In addition, the HDMI source 160 inserts color space information indicating the color space of the image data to be transmitted (image signal) in a blank period of the image data to be transmitted (image signal) and inserts color space information indicating color space in the blank period of the image data (image signal) to be transmitted. Quantization range information of the quantization range of the image data to be transmitted. In this sense, the HDMI source 160 forms a color space information insertion section and a quantization range information insertion section. Details of content information, color space information, and quantization range information are described below.

FIG. 14 shows an example of the configuration of the television receiver 142 . The television receiver 142 has a control section 171 , a user operation section 172 , an HDMI receiver 173 , a tuner 174 , an antenna terminal 175 , a switcher 176 , a display processing section 177 , and a display section 178 .

The control section 171 controls operations of the components of the television receiver 142 . The user operation section 172 forms a user interface and is connected to the control section 171 . The user operation section 172 is formed of keys, buttons, and dials or a remote controller, etc. arranged on a housing (not shown) of the television receiver 142 .

The HDMI receiver 173 receives baseband video and audio data unidirectionally transmitted from the HDMI source 160 of the video camera 141 connected via the HDMI cable 43 for communication conforming to HDMI. In this sense, the HDMI receiver 173 forms a receiving section. Although detailed description is omitted, the HDMI source 173 is configured similarly to the HDMI receiver 61 of the display unit 42 of the AV system 40 of FIG. 1 described above.

The HDMI receiver 173 supplies received image data to the switcher 176 . Note: The data of the sound received by the HDMI receiver 173 is supplied to the switcher for sound.

The tuner 174 receives BS broadcasts, terrestrial digital broadcasts, and the like. The tuner 174 is supplied with a broadcast signal captured through an antenna (not shown) connected to the antenna terminal 175 . The switcher 176 selectively selects the image data received by the HDMI receiver 173 or the image data received by the tuner 174 .

The display processing section 177 performs processing for outline emphasis for display and the like on the image data selected by the switcher 176 . The display section 178 displays an image based on the image data processed by the display processing section 177 . The display portion 178 is formed of, for example, an LCD (Liquid Crystal Display) unit, an organic EL (Electro Luminescence) unit, a PDP (Plasma Display Panel), a CRT (Cathode Ray Tube), and the like.

In the present embodiment, as described above, content identification information, color space information, and quantization range information inserted in blank periods of image data are supplied from the HDMI receiver 173 to the control section 171 . The control section 171 controls the operations of the display processing section 177 and the display section 178 based on the information of when the switcher 176 selects the image data received by the HDMI receiver 173 .

FIG. 15 shows an example of specific configurations of the display processing section 177 and the display section 178 . Referring to FIG. 15, the display processing section 177 includes a chroma decoder 177a, a DRC (Digital Reality Creation) section 177b, an enhancer 177c, and a panel driver 177d.

The chroma decoder 177a performs color-related processing such as changing the color space based on the color space information, etc., on the image data supplied thereto from the HDMI receiver 173 . The chroma decoder 177a forms a color space changing section. The DRC section 177b performs processing for improving picture quality on the image data output from the chroma decoder 177a. In this instance, for example, the DRC section 177b regenerates pixel data of a pixel of interest in accordance with a pattern of pixel data including edges to perform improvement of pixel quality. The DRC section 177b forms a picture quality improvement section.

The enhancer 177c performs processing of edge enhancement on the image data output from the DRC section 177b. Also, when the color space of the image data is the sRGB color space, the enhancer 177c performs processing of expanding a color gamut (color gamut). The enhancer 177c forms an outline-emphasized portion and a color-range-expanded portion. The panel driver 177d drives a liquid crystal panel 178a, which constitutes a display section 178 described below, based on the image data output from the intensifier 177c. In this instance, the panel driver 177d generates drive signals with reference to information of the quantization range. The panel driver 177d also performs gamma correction. The panel driver 177d forms a level changing section.

In addition, referring to FIG. 15, the display portion 178 includes a liquid crystal panel 178a and a backlight 178b. The liquid crystal panel 178a is driven by the above-mentioned panel driver 177d to display an image based on image data. The backlight 178b is formed of, for example, a white fluorescent tube.

An example of the operation of the AV system 140 of FIG. 12 ( FIGS. 13 and 14 ) configured in the above-described manner will be described.

For example, if the user operates the camera 121 to pick up an image of an image pickup, the image pickup element 155 starts an image pickup operation, and obtains picked-up image data corresponding to the image pickup from the picked-up image signal processing section 156 . The color space and quantization range of image data are those designated in advance by the user or automatically set by the control section 151 .

The image data output from the picked-up image signal processing section 156 is encoded together with the sound data by the codec 157 , and the encoded data is recorded on the HD 159 by the recording and reproducing section 158 .

On the other hand, for example, if the user operates the video camera 141 so as to record data from the external device 161, the image and sound data from the external device 161 are encoded by the codec 157, and recorded on the HD 159 by the recording and reproducing section 158 encoded data.

If the user operates the video camera 141 so as to transmit the data recorded on the HD 159, the encoded data is reproduced from the HD 159 by the recording and reproducing section 158 and supplied to the codec 157. The codec 157 decodes the encoded data reproduced by the recording and reproducing section 158 into image and sound data of the baseband, and supplies the image and sound data of the baseband to the HDMI source 160 .

On the other hand, if the user operates the video camera 141 so as to transmit the picked-up image data, the image data output from the picked-up image signal processing section 156 as described above and the sound data corresponding to the image data are encoded while remaining in the baseband data. The decoder 157 is supplied to the HDMI source 160 .

The HDMI source 160 inserts content identification information, color space information, quantization range information, and the like in blank periods of the image data supplied from the codec 157 . Then, the HDMI source 160 transmits the sound data of the baseband provided unidirectionally by the codec 157 and the image data of the baseband together with the image data of the baseband having a blank period in its blank period, to the television receiver 142 through the HDMI cable 143 complying with the communication of HDMI to the television receiver 142. Content identification information, color space information, quantization range information, etc. are inserted into the .

In the television receiver 142 , the HDMI receiver 173 receives baseband image and sound data unidirectionally transmitted from the HDMI source 160 of the video camera 141 through the HDMI cable 143 for HDMI-compliant communication. The HDMI receiver 173 supplies received image data to the switcher 176 and supplies received sound data (not shown) for sound data to the switcher. Furthermore, the HDMI receiver 173 supplies the control section 171 with a control signal inserted in a blank period of image data, for example, content identification information, color space information, quantization range information, and the like.

Also, the image data received by the tuner 174 is supplied to the switcher 176 . When the user performs an operation of selecting the HDMI receiver 173 through the user operation section 172 , the switcher 176 selects image data received by the HDMI receiver 173 . On the other hand, when the user performs another operation of selecting the tuner 174 through the user operation section 172 , the switcher 176 selects the image data received by the tuner 174 .

The image data picked up by the switcher 176 is supplied to the display processing section 177 . The display processing section 177 performs processing suitable for the content type of the image data on the image data under the control of the control section 171 , and supplies the processed image data to the display section 178 . The display section 178 displays an image based on the image data supplied thereto from the display processing section 177 .

Meanwhile, the sound data received by the tuner 174 is supplied to the switcher for sound. Corresponding to the switching of the image data by the switcher 176 described above, the switcher for sound data performs switching of the sound data. Then, the sound data selected by the switcher for sound is supplied to a speaker (not shown), and sound based on the sound data is output from the speaker.

Now, insertion of content identification information, color space information, and quantization range information in blank periods of image data (image signals) by the HDMI source 160 of the video camera 141 in the above-described manner will be described.

Fig. 19 illustrates the data structure of an AVI (Auxiliary Video Information) InfoFrame packet placed in the above-mentioned data slice interval. According to HDMI, AVI InfoFrame packets can be used to send associated information about an image from a source device to a sink device.

In this embodiment, as can be seen from FIG. 19 , the content identification information is arranged hierarchically at the CA (corresponding to ITC of FIG. 7 ) of the sixth byte (data byte 3) of the AVI InfoFrame packet. 1 bit and 2 bits of CT1 and CT0 of the eighth byte (data byte 5).

CA, which is 1-bit data, is for identifying whether or not the content is dynamic picture content. Here, if CA=0, this indicates that the content is normal dynamic picture content, and when CA=1, this indicates that the content is not normal dynamic picture content. CT1 and CT0 which are 2-bit data are valid (activated) when CA=1. In other words, when it is determined based on the ITC that the content is not a normal dynamic picture content, CT1 and CT0 are further used.

In the present embodiment, as illustrated in FIG. 8 , four kinds of content can be identified based on CT1 and CT0 : text content, photo content, movie content, and game content. Specifically, when CT1=0 and CT0=0, the indication is text content. When CT1=0 and CT0=1, it indicates that it is a photo (still picture) content. When CT1=1 and CT0=0, it indicates movie content. When CT1=1 and CT0=1, it indicates game content.

Here, text content means popular IT (Information Technology) content. The photo content means the content of a still picture. The movie content means the contents of a movie or a home video. The game content means the content of the PC or game console video.

As can be seen from FIG. 19, the color space information is arranged in 2 bits of Y1 and Y0 of the fourth byte (data byte 1) and C1 and C0 of the fifth byte (data byte 2) of the AVI InfoFrame packet. 2 bits and 3 bits of EC2, EC1 and EC0 of the sixth byte (data byte 3). In the present embodiment, the definition of the color space information "Y1, Y0, C1, C0, EC2, EC1, ECO" varies depending on the type of content, eg, whether the content is a still picture or not.

Meanwhile, as illustrated from FIG. 19 , the quantization range information is arranged at 2 bits of Q1 and Q0 of the sixth byte (data byte 3) and 2 bits of Q3 and Q2 of the eighth byte (data byte 5). 2 bits in. Q1 and Q0 represent the quantization range of the RGB color space. When Q1=0 and Q0=0, it indicates default (default), and when Q1=0 and Q0=1, it indicates a limited range. Also, when Q1=1 and Q0=0, it indicates the full range. Q3 and Q2 represent the quantization range of YUV. In the present embodiment, the definition of the quantization range information "Q3, Q2" varies depending on the type of content, for example, whether the content is a still picture or not.

FIG. 20 illustrates definitions of color space information and quantization range information in this embodiment. An example of this definition is an example that changes depending on whether the content is a still picture or not.

Y1 and Y0 are described. When the content is anything other than a still picture, when Y1=0 and Y0=0, it indicates "RGB(sRGB)"; when Y1=0 and Y0=1, it indicates "YUV4:2:2 "; when Y1=1 and Y0=0, it indicates "YUV 4:4:4". Meanwhile, when the content is a still picture (photograph), when Y1=0 and Y0=0, it indicates "RGB(sRGB)"; when Y1=0 and Y0=1, it indicates "YUV 4:2:2" ; when Y1=1 and Y0=0, it indicates “YUV 4:4:4”; and when Y1=1 and Y0=1, it indicates “RGB (Adobe)”.

Describe C1 and C0. Regardless of which of the content is a still picture and any content other than a still picture, when C1=0 and C0=0, it indicates "no (data)"; when C1=0 and C0=1, it indicates "sRGB 601"; when C1=1 and C0=0, it indicates "sRGB 709"; and when C1=1 and C0=1, it indicates "EC2 to EC0".

Describe EC2, EC1, and EC0. When the content is anything other than a still picture, it indicates "sYCC 601" when EC2=0, EC1=0, and EC0=0; when EC2=0, EC1=0, and EC0=1, it indicates "sYCC 709". On the other hand, when the content is a still picture, when EC2=0, EC1=0, and EC0=0, it indicates "sYCC 601"; when EC2=0, EC1=0, and EC0=1, it indicates "sYCC 601". 709"; when EC2=0, EC1=1, and EC0=0, it indicates "Adobe601"; and when EC2=0, EC1=1, and EC0=1, it indicates "Adobe 709".

Describe Q3 and Q2. No definition is given when the content is anything other than a still picture. On the other hand, when the content is a still picture (photograph), when Q3=0 and Q2=0, it means "default"; when Q3=0 and Q2=1, it means "limited range"; and When Q3=1 and Q2=0, it means "full range".

The definitions of the color space information and the quantization range information illustrated in FIG. refer to them when Furthermore, the definitions of the color space information and the quantization range information illustrated in FIG. 20 are stored in the ROM 171a built in the control section 171 of the television receiver 142, and the Refer to them for color space information and quantization range information.

Now, an example of control processing in which the control section 171 of the television receiver 142 uses content identification information, color space information, quantization range information, etc., which includes the above-mentioned Described 1bit data (CA) and 2bit data (CT1 and CT0).

The control section 171 first starts the control process in step ST11 and then advances the process to step ST12. In step ST12, the control section 171 judges whether or not ITC=1 is satisfied. If ITC=1 is not satisfied, the control section 171 recognizes that the received image data relates to normal dynamic picture content, and performs normal dynamic picture processing in step ST13.

Specifically, the control section 171 controls the chroma decoder 177a so that the color space in which the color space information interpreted by the definition of the dynamic picture can be obtained. Furthermore, the control section 171 controls the DRC section 177b so as to execute picture quality improvement processing. Furthermore, the control section 171 controls the enhancer 177c so as to emphasize high-frequency components to perform outline emphasis and to perform processing of expanding the color range when the color space is sRGB. Furthermore, the control section 171 controls the panel driver 177d so as to generate a drive signal within the quantization range and perform ordinary gamma correction when the quantization range is interpreted with the definition of a dynamic picture. In addition, the control section 171 controls the backlight 178b so as to establish an ordinary color temperature.

When it is judged in step ST12 that ITC=1 is satisfied, the control section 171 advances the process to step ST14. In step ST14, the control section 171 judges whether or not CT1=0 is satisfied. Then, if CT1=0 is satisfied, the control section 171 judges in step ST15 whether CT0=0 is satisfied.

When CT0=0 is satisfied, the control section 171 recognizes that the received data relates to text content, and executes text (text) processing in step ST16. In this instance, the control section 171 controls the operation of the enhancer 177c so that the enhancer 177c may not perform contour emphasis that emphasizes high-frequency components. Note: In other respects, the control section 171 performs control similar to that in the ordinary dynamic picture processing described above.

In this way, when the received image data relates to text content, by preventing the enhancer 177c from performing outline emphasis, it is possible to prevent a situation where it becomes difficult to read characters due to outline emphasis.

On the other hand, if CT0=0 is not satisfied at step ST15, the control section 171 recognizes that the received image data relates to photo content (content of a still picture), and performs photo (photograph) processing at step ST17. In this instance, the control section 171 controls the operation of the chroma decoder 177a so that a color space in which color space information is interpreted using the definition of a still picture can be established. Further, the control section 171 controls the panel driver 177d so that a drive signal is generated within the quantization range in which the quantization range information is interpreted using the definition of a still picture. Regarding other points, the control section 171 performs control similar to that in the ordinary dynamic picture processing described above.

Note that the panel controller 177d includes an OSD (On-Screen Display) display section 177e although not described above, and the control section 171 may control the OSD display section 177e so that, for example, the contents and contents shown in FIG. 22 are displayed on the screen of the liquid crystal panel 178a. The type of color space. In the display example of FIG. 22 , "Photo" indicates that the type of content is a still picture, and indicates that the type of color space is "Adobe". Such an OSD display of the type of content and the type of color space as just described can be applied not only to still pictures but also to other content. The user can easily grasp the type of content and the type of color space from the OSD display.

In this way, by causing the enhancer 177c to set the color space to the color space for still pictures when the received image data relates to photo content, it is possible to advantageously display images based on photos ( image of the image data of the content of the still picture).

On the other hand, if CT1=0 is not satisfied at step ST14, the control section 171 determines whether CT0=0 is satisfied at step ST18.

If CT0=0 is satisfied, the control section 171 recognizes that the received image data relates to movie content, and executes movie (movie) processing in step ST19. In this instance, the control section 171 controls the gamma correction of the panel driver 177d to raise the level of the black side and controls the backlight 177b to lower the color temperature. Note: In other respects, the control section 171 performs control similar to that in the ordinary dynamic picture processing described above.

In this way, if the received image data relates to movie content, by raising the level of the black side and lowering the color temperature of the backlight 178b by means of the panel driver 177d, display of an image suitable for the movie content can be performed.

On the other hand, if CT0=0 is not satisfied at step ST18, the control section 171 recognizes that the received image data relates to game content, and executes game (game) processing at step ST20. In this example, the control panel 171 controls the operation of the DRC section 177b so that the DRC section 177b may not perform image improvement processing. Note: In other respects, the control section 171 performs control similar to that in the ordinary dynamic picture processing described above.

In this way, when the received image data relates to game content, by controlling the DRC section 177d so that the picture quality improvement process may not be executed, the delay of the picture quality improvement process caused by the picture with respect to the sound can be alleviated, and the occurrence of a gap between the sound and the picture can be prevented. The feeling of unfamiliarity caused by displacement. Now, another example of control processing in which content identification information, color space information, quantization range information, etc., including the above 1bit data (CA) and 2-bit data (CT1 and CT0) described in the text. In FIG. 23 , steps corresponding to those of FIG. 21 are denoted by the same reference numerals.

The control section 171 first starts the control process at step ST11 and then advances the process to step ST11a. In step ST11a, the control section 171 determines which of the automatic mode, video (moving picture) mode, photo (still picture) mode, text mode, movie mode, and game mode the set mode is.

The user can operate the user operation portion 172 to perform mode setting. FIG. 24 shows a screen image of a GUI (Graphical User Interface) displayed on the liquid crystal panel 178a. The user can set a desired mode by operating the user operation part 172 to press a button of an automatic mode, a video (moving picture) mode, a photo (still picture) mode, a text mode, a movie mode, or a game mode displayed on the GUI screen image. model.

If the automatic mode is set at step ST11a, the control section 171 advances the processing to step ST12 where the control section 171 executes processing similar to that in the flowchart of FIG. 21, although a detailed description thereof is omitted. On the other hand, if one of video mode, photo mode, text mode, movie mode, and game mode is set at step ST11a, the control section 171 advances the process to step ST11b. In step ST11b, the control section 171 executes processing (moving picture processing, text processing, photo processing, movie processing, or game processing) corresponding to the set mode (refer to ST13, ST16, ST17, ST19 or ST20).

In the example of the control processing illustrated in the flowchart of FIG. 23 , if the setting mode is the automatic mode, similarly to the example of the control processing illustrated in the flowchart of FIG. 21 , the received image data (image signal) Optimal processing depending on the type of content is performed. Note: In the example of the control processing illustrated in the flowchart of FIG. 23, if the set mode is one of video mode (moving picture), photo mode (still picture), text mode, movie mode, and game mode , the processing corresponding to the set mode is forcibly executed on the received image data (image signal).

Note: Although in the foregoing description, the control section 171 sets the color space to the color space indicated by the color space information (the operation of the chroma decoder 177a is controlled so that the color space indicated by the color space information can be established), the user It is also possible to perform mode setting so that a predetermined color space can be forcibly established.

The flowchart of Fig. 25 illustrates an example of control processing in this example. The control section 171 first starts the processing operation in step ST31 and then advances the processing to step ST32. In step ST32, the control section 171 determines which of the automatic mode, sRGB mode, sYCC mode, and Adobe RGB mode the set mode is.

The user can operate the user operation portion 172 to perform mode setting. FIG. 26 shows a GUI (Graphical User Interface) screen image displayed on the liquid crystal panel 178a at the time of mode setting. The user can press one of the auto button, sRGB button, sYCC button, and Adobe RGB button displayed on the GUI screen image to set a desired mode by operating the user operation portion 172.

If the setting mode is the automatic mode at step ST32, the control section 171 advances the process to step ST33, where the control section 171 controls the operation of the chroma decoder 177a so that the color space indicated by the color space information can be established , although its detailed description is omitted. On the other hand, if the set mode is one of the sRGB mode, the sYCC mode, and the Adobe RGB mode at step ST32, the control section 171 advances the process to step ST34, where the control section 171 controls the chroma decoding The operation of the device 177a makes it possible to establish a color space corresponding to the set mode.

In the example of the control processing illustrated in the flowchart of FIG. 25 , if the setting mode is the automatic mode, an optimized color space depending on received image data (image signal) is set. Also, in the example of the control processing illustrated in the flowchart of FIG. 25 , if the setting mode is one of sRGB mode, sYCC mode, and Adobe RGB mode, a color space suitable for the setting mode is forcibly set.

Furthermore, in the foregoing description, the control section 171 sets the quantization range to the quantization range indicated by the quantization range information for the received image data (image signal) (the control panel driver 177d so that the quantization range indicated by the quantization range information Generate drive signal within). However, the control section 171 may be configured so that the user can forcibly set the mode in order to set a predetermined quantization range.

The flowchart of Fig. 27 illustrates an example of control processing in this example. The control section 171 first starts the processing operation in step ST41 and then advances the processing to step ST42. In step ST42, the control section 171 determines which one of the automatic mode, the full range mode, and the limited range mode the set mode is.

The user can operate the user operation portion 172 to perform mode setting. FIG. 28 shows a GUI (Graphical User Interface) screen image displayed on the liquid crystal panel 178a at the time of mode setting. The user can press any button for the automatic mode, the full range mode, and the limited range mode displayed on the GUI screen image to set a desired mode by operating the user operation portion 172 .

If the set mode is the automatic mode at step ST42, the control section 171 advances the process to step ST43, and at step ST43, the control section 171 controls the operation of the panel driver 177d such that the drive is generated within the quantization range indicated by the quantization range information. signal, although its detailed description is omitted. On the other hand, if the set mode is one of the full-range mode and the limited-range mode at step ST42, the control section 171 advances the process to step ST44, where the control section 171 controls the operation of the panel driver 177d. The operation is such that the drive signal is generated within the quantization range corresponding to the set mode.

In the example of the control process illustrated in the flowchart of FIG. 27 , if the setting mode is the automatic mode, an optimized quantization range corresponding to received image data (image signal) is set. Furthermore, in the example of the control process illustrated in the flowchart of FIG. 27 , if the setting mode is one of the full range mode and the limited range mode, the quantization range corresponding to the setting mode is forcibly set.

As described above, in the AV system 140 shown in FIG. 12 (FIG. 13 and FIG. 14), the HDMI source 160 of the video camera 141 inserts content identification information into the AVIInfoFrame packet placed in the blank period (data slice interval) of the image data. CA, CT1, and CT0, and transmit image data to the HDMI receiver 173 of the television receiver 142 in the form of differential signals through three TMDS channels #0, #1, and #2. Accordingly, the television receiver 142 can recognize the type of content of the received image data based on the content identification information and can perform optimized processing on the image data in accordance with the content type.

In addition, in the AV system 140 shown in FIG. 12 (FIG. 13 and FIG. 14), the content identification information inserted by the HDMI source 160 of the video camera 141 in the blank period of the image data includes 1-bit data CA and 2-bit The 1-bit data CA is used to identify whether the content is a common dynamic picture content, and the 2-bit data CT1 and CT2 are used when the content is determined not to be a dynamic picture content based on the data CA. In this instance, if the transmission frequency of ordinary dynamic picture content is high, only the determination process of the content type in which 1-bit data CA placed on a higher-level layer (layer) is used is frequently performed, and It becomes possible for the control section 171 of the receiver 142 to reduce the load of the decision processing.

In addition, in the AV system 140 shown in FIG. 12 (FIG. 13 and FIG. 14), the definition of color space information and quantization range information inserted by the HDMI source 160 of the video camera 141 in the blank period of the image data depends on the content. The content varies depending on the type, and in this embodiment, depending on whether the content is a still picture or not. The television receiver 142 may display an image based on the image data in an optimized color space and an optimized level according to the type of content.

Note: Although in the above-described embodiment, the definition of color space information and quantization range information varies depending on whether the content is a still picture (refer to FIG. 20 ), color space information and quantization range are defined more finely for each type of content Information is also possible idea.

Furthermore, although not described above, image data having a color space (known from color space information) that may not be supported by the television receiver 142 may be transmitted from the video camera 141 to the television receiver 142 . For example, this is a case where the user can freely designate the color space on the camera 141 or the like. In this instance, the control section 171 of the television receiver 142 can control the OSD display section 177e built in the panel driver 177d so that the color space of the image data transmitted from the video camera 141 that the television receiver 142 does not support is displayed on the liquid crystal panel 178a. OSDs. In this instance, the user can easily recognize based on the OSD display that image data having a color space not supported by the television receiver 142 is transmitted from the video camera 141 to the television receiver 142 .

Furthermore, in the above-described embodiments, in order to insert content identification information for identifying the type of content in a blank period of an image signal of predetermined content to be transmitted, AVIInfoFrame of HDMI is used. However, it is also a possible idea to use the SPD (Source Product Description) described below.

Figure 29 illustrates the configuration of the SPD InfoFrame. For example, data byte 1 to data byte 8 are used for a vendor name character (vendor name) area, and vendor name information is placed using this area. Meanwhile, data byte 9 to data byte 24 are used in the product description character (model) area. In addition, data byte 25 is used for the source.device.info (source device type) area. As can be seen in FIG. 30, a code indicating a source device type is placed in the source device type area. For example, when the source device is a digital STB, "01h" is placed; when the source device is a digital DVC (digital video camera), "05h" is placed; when the source device is a digital DSC (digital still camera), "06h" is placed.

For example, a specific vendor name "ABCD" is described in the vendor name area and a code "06h" indicating that the source device is a DSC (Digital Still Camera), which indicates that the content is a still picture content, is described in the source device type area. In other cases, the indicated content is dynamic picture content. Note: The specific supplier name is not limited to a certain supplier name, but can be one of several supplier names.

An example of control processing of the control section 171 of the television receiver 142 for transmitting content identification information from a source device to a sink device using the SPD InfoFrame of HDMI described above is described with reference to the flowchart of FIG. 31 .

The control section 171 first starts the control process in step ST51 and then advances the process to step ST52. In step ST52, the control section 171 judges whether or not the vendor name described in the vendor field of the SPD InfoFrame is "ABCD".

If the vendor name is "ABCD", the control section 171 determines in step ST53 whether a code indicating DSC is described in the source device type of SPDInfoFrame. When the vendor name is not "ABCD" at step ST52 or the code indicating DSC is not described at step ST53, the control section 171 executes normal dynamic picture processing at step ST55.

Specifically, the control section 171 controls the chroma decoder 177a so as to create a color space in which color space information is interpreted using the definition of a dynamic picture. Furthermore, the control section 177a controls the DRC section 177b so as to execute picture quality improvement processing. Furthermore, the control section 171 controls the enhancer 177c to emphasize high-frequency components to perform outline emphasis and to perform processing of expanding the color range when the color space is sRGB. Furthermore, the control section 171 controls the panel driver 177d to generate a drive signal within the quantization range and to perform ordinary gamma correction when the quantization range information is interpreted using the definition of a dynamic picture. In addition, the control section 171 controls the backlight 178b so as to establish an ordinary color temperature.

On the other hand, when the code indicating DSC is described at step ST53, the control section 171 executes photo (photograph) processing at step ST54. In this instance, the control section 171 controls the operation of the chroma decoder 177a so as to create a color space in which color space information is interpreted using the definition of a still picture. Further, the control section 171 controls the panel driver 177d so as to generate a drive signal within a quantization range in which the quantization range information is interpreted using the definition of a still picture. Regarding other points, the control section 171 performs control similar to that in the ordinary dynamic picture processing described above.

Now, another example of control processing of the control section 171 of the television receiver 142 for transmitting content identification information from a source device to a sink device using the above-described SPDInfoFrame of HDMI is described with reference to the flowchart of FIG. 32 .

The control section 171 first starts the control process in step ST51 and then advances the process to step ST51a. In step ST51a, the control section 171 determines which of the automatic mode, the video (moving picture) mode, and the photo (still picture) mode is the set mode.

The user can operate the user operation portion 172 to perform mode setting. FIG. 33 shows a screen image of a GUI (Graphical User Interface) displayed on the liquid crystal panel 178a at the time of mode setting. The user can set a desired mode by operating the user operation part 172 to press a button of an automatic mode, a video (moving picture) mode, a photo (still picture) mode, a text mode, a movie mode, or a game mode displayed on the GUI screen image. model.

If the automatic mode is set at step ST51a, the control section 171 advances the processing to step ST52, and at step ST12 the control section 171 executes processing similar to that in the flowchart described above with reference to FIG. 31, although the same details are omitted. describe. On the other hand, if one of the video mode and the photo mode is set at step ST51a, the control section 171 executes processing corresponding to the set mode (moving picture processing or photo processing) at step ST55 or at step ST54.

In the example of the control processing illustrated in the flowchart of FIG. 32 , if the setting mode is the automatic mode, similarly to the example of the control processing illustrated in the flowchart of FIG. 31 , the received image data (image signal) Optimal processing depending on the type of content is performed. Furthermore, in the example of the control processing illustrated in the flowchart of FIG. 32 , if the set mode is one of the video (moving picture) mode and the photo (still picture) mode, the received image data ( image signal) forcibly executes processing appropriate to the set mode.

Note: Although in the foregoing description, both the Vendor Name field and the Source Device Type field of HDMI's SPD InfoFrame are used to send content identification information from the source device to the sink device, it is possible to use only the Vendor Name field or the Source Device Type The area or the model area can be used additionally so that not only the type of content of video (moving picture) and photo (still picture) but also the type of content of text, movie, game, etc. can be identified.

Now, still another embodiment of the present invention is described.

FIG. 34 shows an example of the configuration of the AV system 180 to which the present invention is applied. Referring to FIG. 34, an AV system 180 includes a video camera 181 as a transmitting device and a television receiver 182 as a receiving device. The video camera 181 and the television receiver 182 are connected to each other by a USB (Universal Serial Bus) cable 183 .

In the AV system 180 of the present invention, for example, an MPEG file as a moving picture file and a JPEG file as a still picture file are transmitted from the video camera 181 to the television receiver 182 .

When the file transmitted to the television receiver 182 is a JPEG file and a specific maker (maker) code is included in the tag of the JPEG file, the television receiver 182 performs photo (photograph) processing on received image data (image signal) , but in any other case, the television receiver 182 performs normal motion picture processing. As a result, optimization processing suitable for the type of content is performed on the received image data (image signal). Here, photo (photograph) processing and general moving picture processing are similar to those described above in connection with the AV system 140 shown in FIG. 12 .

Note: The television receiver 182 may be configured so that it performs photo (photograph) processing on received image data (image signal) based only on the fact that a file transmitted thereto is a JPEG file.

In addition, the AV system 140 described above with reference to FIG. Another route is to send the compressed image signal from the video camera 141 to the television receiver 142 through the USB cable 183 similar to that in the AV system 180 described above with reference to FIG. 34 .

Furthermore, although in the AV system 180 shown in FIG. 34, the video camera 181 and the television receiver 182 have a USB terminal and are connected to each other by a USB cable 183, the video camera 181 and the television receiver 182 may have another terminal and are connected to each other.

Furthermore, although in the above-described embodiments, different devices are connected to each other by cables, it is natural that the present invention can be similarly applied to different devices connected to each other by radio.

industrial application

The present invention can be applied to a communication system in which optimized processing suitable for the type of content of an image signal (image data) can be performed on the receiving side and which uses a communication interface such as, for example, HDMI.

Claims (53)

1. A communication system comprising sending device, and receiving means, wherein said sending means comprises an identification information inserting section configured to insert content identification information for identifying a type of the predetermined content into a blank period of an image signal of the predetermined content to be transmitted, and a transmitting section configured to transmit, to the receiving device, an image signal having content identification information inserted in a blank period of the image signal by the identification information inserting section in the form of a differential signal through a plurality of channels, and The receiving device includes a receiving section configured to receive an image signal having content identification information inserted in a blank period thereof transmitted from the transmitting device to the receiving section in the form of a differential signal through a plurality of channels, a display processing section configured to perform processing for display on the image signal received by the receiving section, and A control section configured to control the operation of the display processing section based on insertion of the content identification information in a blank period of the image signal received by the receiving section. 2. A sending device, comprising an identification information inserting section configured to insert content identification information for identifying a type of the predetermined content into a blank period of an image signal of the predetermined content to be transmitted, and A transmission section configured to transmit an image signal having content identification information inserted in a blank period of the image signal by the identification information insertion section in the form of a differential signal through a plurality of channels. 3. The sending device according to claim 2, wherein The content identification information is identification information for at least identifying whether predetermined content is still picture content. 4. The sending device according to claim 2, wherein The content identification information is formed of a plurality of data placed hierarchically. 5. The sending device according to claim 4, wherein The content identification information is formed of first data and second data, wherein the first data is formed of 1-bit data, the second data is formed of 2-bit data, and the second data is further used when the first data is in one state. 6. The sending device according to claim 5, wherein The types of content identified by the content identification information are motion picture, text, still picture, movie, and game. 7. The sending device according to claim 2, wherein The content identification information includes information indicating the type of content. 8. The sending device according to claim 2, wherein The content identification information includes one or both of information indicating a vendor name and information indicating a type of source device. 9. The sending device according to claim 2, wherein The identification information inserting section inserts content identification information for identifying a type of content into a blank period of an image signal of predetermined content to be transmitted using AVI InfoFrame of HDMI. 10. The sending device according to claim 2, wherein The identification information inserting section inserts content identification information for identifying a type of content into a blank period of an image signal of predetermined content to be transmitted using SPD InfoFrame of HDMI. 11. The sending device according to claim 10, wherein The identification information inserting section inserts content identification information for identifying a type of content into an image signal of predetermined content to be transmitted using one or both of a vendor name area and a source device type area of SPD InfoFrame of HDMI. during the blank period. 12. The sending device according to claim 2, further comprising a color space information inserting section configured to insert color space information of the image signal into a blank period of the image signal of predetermined content to be transmitted, wherein The definition of the color space information varies in response to the type of content indicated by the content identification information. 13. The sending device according to claim 12, wherein The definition of the color space information varies depending at least on whether the predetermined content is a still picture or not. 14. The sending device according to claim 2, further comprising The quantization range information inserting section is configured to insert the quantization range information of the image signal into a blank period of the image signal of the predetermined content to be transmitted, wherein The definition of the quantization range information varies depending on the type of predetermined content indicated by the content identification information. 15. The sending device according to claim 14, wherein The definition of the quantization range information varies depending at least on whether the predetermined content is a still picture or not. 16. The sending device according to claim 2, further comprising A reproducing section configured to reproduce from a recording medium and obtain an image signal of predetermined content to be transmitted. 17. The sending device according to claim 2, further comprising The camera section is configured to pick up an image of the image pickup object to obtain an image signal of predetermined content to be transmitted. 18. The sending device according to claim 2, further comprising A user operation section configured to allow a user to designate a color space of an image signal of predetermined content to be transmitted. 19. The sending device according to claim 2, further comprising A color space information acquisition section configured to acquire, from a transmission destination of an image signal of predetermined content to be transmitted, information on a color space that the transmission destination can support. 20. The sending device according to claim 19, further comprising a user operation section configured to allow a user to designate a color space of an image signal of predetermined content to be transmitted, wherein The user may designate a predetermined color space among the indicated color spaces based on the information of the color space acquired by the color space information acquisition section through the user operation section. 21. The sending device according to claim 19, further comprising a color space setting section configured to select a predetermined color space from color spaces indicated by the information of the color space acquired by the color space information acquisition section to automatically set the color of an image signal of predetermined content to be transmitted space. 22. A sending method comprising an identification information inserting step of inserting content identification information for identifying a type of the predetermined content into a blank period of an image signal of the predetermined content to be transmitted, and In the transmitting step, the image signal having the content identification information inserted in the blank period of the image signal in the identification information inserting step is transmitted as a differential signal through a plurality of channels. 23. A receiving device comprising a receiving section configured to receive an image signal transmitted to the receiving section in the form of a differential signal through a plurality of channels and having content identification information for identifying a type of content inserted therein in a blank period; a display processing section configured to perform processing for display on the image signal received by the reception section, and A control section configured to control the operation of the display processing section based on insertion of the content identification information in a blank period of the image signal received by the reception section. 24. The receiving device of claim 23, further comprising an input terminal to which a compressed image signal is input; a different display processing section configured to perform processing for display on the image signal input to the input terminal; and A different control section configured to control the operation of the display processing section in response to a file format of the image signal input to the input terminal. 25. The receiving device according to claim 24, wherein The input terminal is a USB terminal. 26. The receiving device according to claim 24, wherein The different control section controls the display processing section so that when the image signal input to the input terminal is a JPEG file, still picture processing is performed on the image signal. 27. The receiving device according to claim 24, wherein The different control section controls the display processing section so that the image signal input to the input terminal is a JPEG file and when a specific maker code is included in a mark of the JPEG file, still picture processing is performed on the image signal. 28. The receiving device according to claim 23, wherein the display processing section includes at least an outline emphasis section configured to perform outline emphasis on the image signal, and The control section controls such that the outline emphasis section does not perform outline emphasis on the image signal when the content identification information indicates text. 29. The receiving device of claim 23, wherein the display processing section includes at least a color space changing section configured to change a color space, and The control section controls the color space changing section so as to change the color space to a color space for a still picture when the content identification information indicates a still picture. 30. The receiving device according to claim 23, wherein the display processing section includes at least a level changing section configured to change a black side level, and The control section controls the level changing section so that when the content identification information indicates a movie, the level on the black side is raised. 31. The receiving device according to claim 23, wherein The display processing section includes at least a picture quality improvement section configured to perform processing for picture quality change on the image signal and to provide a predetermined delay to the image signal, and The control section controls such that the picture quality improvement section does not perform processing on the image signal when the content identification information indicates a game. 32. The receiving device according to claim 23, wherein the content identification information indicates a still picture or a moving picture, and The control part controlling the display processing section so that when the content identification information indicates a still picture, processing suitable for a still picture is performed on the image signal, and The display processing section is controlled so that when the content identification information indicates a dynamic picture, processing suitable for a dynamic picture is performed on the image signal. 33. The receiving device of claim 23, further comprising The mode setting part is configured to allow the user to set one of the automatic mode, the still picture mode and the dynamic picture mode, wherein The content identification information indicates a still picture or a moving picture, When the automatic mode is set by the mode setting section, the control section controlling the display processing section so that when the content identification information indicates a still picture, processing suitable for a still picture is performed on the image signal, and controlling the display processing section so that when the content identification information indicates a dynamic picture, processing suitable for a dynamic picture is performed on the image signal, and When the still picture mode or the moving picture mode is set by the mode setting section, the control section The display processing section is controlled so that processing suitable for the set mode is performed on the image signal. 34. The receiving device according to claim 23, wherein The content identification information indicates a still picture, a moving picture, a text, a movie, or a game, and the control section controlling the display processing section so that when the content identification information indicates a still picture, processing suitable for a still picture is performed on the image signal, controlling the display processing section so that when the content identification information indicates a dynamic picture, processing suitable for a dynamic picture is performed on the image signal, controlling the display processing section so that when the content identification information indicates the text, processing suitable for the text is performed on the image signal, controlling the display processing section so that when the content identification information indicates a movie, processing suitable for a movie is performed on the image signal, and The display processing section is controlled so that when the content identification information indicates a game, processing suitable for the game is performed on the image signal. 35. The receiving device of claim 23, further comprising The mode setting part is configured to allow the user to set one of automatic mode, still picture mode, dynamic picture mode, text mode, movie mode and game mode, wherein content identifying information indicating still pictures, moving pictures, text, movies or games, When the automatic mode is set by the mode setting section, the control section controlling the display processing section so that when the content identification information indicates a still picture, processing suitable for a still picture is performed on the image signal, and controlling the display processing section so that when the content identification information indicates a dynamic picture, processing suitable for a dynamic picture is performed on the image signal, and When the still picture mode, moving picture mode, text mode, movie mode or game mode is set by the mode setting part, the control part The display processing section is controlled so that processing suitable for the set mode is performed on the image signal. 36. The receiving device according to claim 23, wherein inserting, in addition to content identification information, color space information whose definition is changed in response to a type of content indicated by the content identification information, in a blank period of the image signal received by the receiving section, and The control section controls the operation of the display processing section based on content identification information and color space information inserted into a blank period of the image signal received by the reception section. 37. The receiving device according to claim 36, wherein the display processing section includes at least a color range expansion section configured to expand a color range, and The control section controls the color range expansion section so that color range expansion processing is performed on the image signal when the color space indicated by the color space information is sRGB. 38. The receiving device according to claim 36, wherein the color space information indicates a color space in sRGB, sYCC, or Adobe RGB, and The control section sets the color space to the color space indicated by the color space information 39. The receiving apparatus according to claim 36, further comprising The mode setting part is configured to allow the user to set a mode in automatic mode, sRGB mode, sYCC mode and Adobe RGB mode, wherein The color space information indicates the sRGB, sYCC, or Adobe RGB color space, and When the automatic mode is set by the mode setting section, the control section sets the color space as the color space indicated by the color space information, When the sRGB mode, the sYCC mode, or the Adobe RGB mode is set by the mode setting section, the control section sets the color space to a color space corresponding to the set mode. 40. The receiving device according to claim 23, wherein In the blank period of the image signal received by the receiving section, quantization range information of the image signal is inserted in addition to the content identification information, the quantization range information of the image signal being defined in response to the content indicated by the content identification information type varies, and The control section controls the operation of the display processing section based on the insertion of content identification information and quantization range information into a blank period of the image signal received by the reception section. 41. The receiving device according to claim 40, wherein The quantized range information indicates a full range or a limited range, and The control section sets the quantization range for the image signal as the quantization range indicated by the quantization range information. 42. The receiving device of claim 40, further comprising The quantized range information indicates a full range or a limited range, and a mode setting section configured to allow a user to set one of an automatic mode, a full range mode and a limited range mode, wherein When the automatic mode is set by the mode setting section, the control section sets the quantization range for the image signal as the quantization range indicated by the quantization range information, When the full-range mode or the limited-range mode is set by the mode setting section, the control section sets the quantization range for the image signal to a quantization range corresponding to the set mode. 43. The receiving device of claim 23, further comprising a tuner for receiving broadcast signals; and A switcher for selectively supplying the image signal received by the tuner or the image signal received by the receiving section to the display processing section. 44. The receiving device according to claim 36, wherein the display processing section includes an OSD section, and The control section controls the OSD section so that the OSD displays the type of content indicated by the content identification information or the type of color space indicated by the color space information. 45. The receiving device of claim 36, wherein the display processing section includes an OSD section, and The control section controls the OSD section so that when the color space indicated by the color space information is not supported, the OSD displays an unsupported color space. 46. A method of receiving comprising a receiving step of receiving an image signal transmitted in the form of a differential signal through a plurality of channels and having content identification information for identifying a type of content inserted in a blank period thereof, a display processing step of performing processing for displaying an image on the image signal received at the receiving step, and A control step of controlling the operation of the display processing step based on the insertion of the content identification information in a blank period of the image signal received at the receiving step. 47. A receiving device comprising a receiving section configured to receive an image signal of predetermined content having content identification information for identifying a type of content; a display processing section configured to perform processing for display on the image signal received by the receiving section; and A control section configured to control the operation of the display processing section based on content identification information that the image signal received by the receiving section has. 48. The receiving device of claim 47, wherein Content identification information is inserted in blank periods of the image signal. 49. The receiving device of claim 47, wherein The content identification information includes information on the compression method of the image signal. 50. The receiving device of claim 47, wherein the reception section receives the compressed image signal input to the input terminal, and The control section controls the display processing section so that when the image signal received by the receiving section is a JPEG file, still picture processing is performed on the image signal. 51. The receiving device according to claim 50, wherein The input terminal is a USB terminal. 52. The receiving device of claim 47, wherein the reception section receives the compressed image signal input to the USB terminal, and The control section controls the display processing section so that when the image signal received by the receiving section is a JPEG file and includes a specific maker code in a tag of the JPEG file, still picture processing is performed on the image signal. 53. The receiving device according to claim 52, wherein The input terminal is a USB terminal. 54. A method of receiving comprising a receiving step of receiving an image signal of predetermined content having content identification information for identifying a type of content; a display processing step of performing processing for display on the image signal received at the receiving step; and The control step controls the operation of the display processing step based on the content identification information that the image signal received in the receiving step has.

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