BR112015031222B1 - TRANSMITTING AND RECEIVING DEVICES, METHODS FOR TRANSMITTING AND RECEIVING IMAGE DATA IN A HIGH DYNAMIC RANGE, AND COMPUTER READABLE NON-TRANSITIVE MEMORIES - Google Patents

Abstract

TRANSMITTING AND RECEIVING DEVICE, METHOD FOR TRANSMITTING AND RECEIVING IMAGE DATA IN A HIGH DYNAMIC RANGE, AND PROGRAM. The purpose of the present invention is to transfer HDR image data between machines in a satisfactory manner. A transmitting device (source machine) transmits HDR image data to a receiving device (receiving machine) via a channel. In the process, the transmitting device transmits transfer format information and/or gamma correction information for the HDR image data to the receiving device via the channel. The receiving device performs processing (a decoding process, gamma correction process, and the like) of the received HDR image data on the basis of the received transfer format information and/or gamma correction information. For example, the transmitting device receives from the receiving device information about transfer formats and/or gamma correction formats with which the receiving device is compatible and selects a format with which the receiving device is compatible for use.

Description

Technical Field

[001] The present invention relates to a transmission device, a method for transmitting image data in a high dynamic range, a receiving device, a method for receiving image data in the high dynamic range, and a program, and more particularly to a transmission device and the like for transmitting image data in a high dynamic range to display an image in the high dynamic range. Fundamentals of the Technique

[002] In recent years, for example, a High Definition Multimedia Interface (HDMI) has become widespread as a communications interface through which a digital frame signal, that is, an uncompressed (baseband) frame signal (data picture) and a digital voice signal (voice data) associated with the frame signal, is transmitted at a high speed from a Digital Versatile Disc (DVD) recorder, a TV converter box, or other Audio Visual Source ( AV) to a television receiver, projector, or other displays. For example, HDMI specifications are described in detail in NPL 1.

[003] For example, an AV system and the like are considered in which a disc player as a source device and a television receiver as a synchronized device are connected in HDMI to each other, but luminance is luminance adjusted on the assumption that image data recorded on the disc player is displayed on a display device with a descriptive report such as maximum luminance of 100 cd/m2.

[004] On the other hand, with advances in technology, the maximum luminance of the display device has been extended in practice to 1,000 cd/m2, exceeding 100 cd/m2 in the related art, and the ability of the display device to perform high output luminance is not put to good use.

[005] Then, High Dynamic Range (HDR) processing is proposed in which luminance dynamic range processing is performed such that processing of image data with maximum luminance is performed exceeding 100 cd/m2 is proposed and has been extended in practice in terms capturing a still image and post-processing. For example, proposals for a method of recording HDR image data and processing the HDR image data are presented in PTL 1. Non-Patent Literature Citation List NPL 1: High Definition Multimedia Interface Report Descriptive Version 1.4b, October 11, 2011. Patent Literature PTL 1: Unexamined Japanese Patent Application Publication No. 2005-352482

Summary of the Invention Technical problem

[006] No proposal on transmission specifications for high dynamic range in digital interfaces, such as HDMI, has been presented in the related art.

[007] An objective of the present technology is to enable satisfactory transmission of image data in a high dynamic range between devices to be performed.

Solution to the Problem

[008] A concept of the present technology is a transmission device including: a data transmission unit that transmits image data in a high dynamic range to an external device via a transmission path; and an information transmission unit that transmits information about a transmission method for and/or gamma correction information for image data in the high dynamic range that is transmitted in the data transmission unit, to the external device via the path transmission.

[009] In the present technology, the data transmission unit transmits the image data in the high dynamic range to the external device via the transmission path. For example, the data transmission unit may transmit the image data in the high dynamic range to the external device via the transmission path using a differential signal.

[0010] For example, the image data in the high dynamic range may include first data and second data, and the data transmission unit may configure the first data and the second data in a stipulated frame format for a stereoscopic image, and can transmit the frame format to the external device through the transmission path. Furthermore, for example, the image data in the high dynamic range may include first data and second data, and the data transmission unit may transmit the first data, such as a first frame image, to the external device via the data path. transmission and can transmit the second data, as a second frame image, to the external device via the transmission path.

[0011] For example, the image data in the high dynamic range may include first data and second data, and the first data may be low-order 8-bit data of the image data in the high dynamic range, and the second data may be data high order bit data of the image data in the high dynamic range, or the first data may be high order 8 bit data of the image data in the high dynamic range and the second data may be low order bit data of the image data in the high dynamic range. image in high dynamic range.

[0012] The information transmission unit transmits the information about the transmission method for and/or the information about the gamma correction for the image data in the high dynamic range that is transmitted in the data transmission unit, to the device externally through the transmission path. For example, the information transmission unit may insert information about the transmission method for and/or gamma correction information for image data in the high dynamic range that is transmitted in the data transmission unit, during a erase period of image data in high dynamic range, and thus can transmit the entered information to the external device. Furthermore, the information transmission unit may transmit information about the transmission method for and/or information about gamma correction for image data in the high dynamic range that is transmitted in the data transmission unit, to the external device through a control data line that makes up the transmission path.

[0013] Furthermore, for example, the information transmission unit can transmit information about the transmission method for and/or information on gamma correction for image data in the high dynamic range that is transmitted in the transmission unit. data, to the external device via a bidirectional communication path that is configured from a predetermined line of the transmission path. In this case, for example, the bidirectional communication path may be a pair of differential communication paths, and at least one of the differential communication paths in the pair may have a function of receiving a connection status notification from the external device using signal potential. direct current polarization.

[0014] Furthermore, for example, information about the transmission method for and information about gamma correction for image data in the high dynamic range that is transmitted in the data transmission unit may include at least one, between information at a maximum white level exceeding 100%, of image data in the high dynamic range, bit value at the time of expression at a black level, bit value at the time of expression at a white level of 100%, a flag indicating whether or not processing for high dynamic range is performed, a luminance level of a receiving device that is assumed at the time of the 100% white level, a luminance input level that is required for an increase of luminance in an image in the high dynamic range, and an increase luminance output level that is necessary for the luminance increase in the image in the high dynamic range.

[0015] In the present technology, in this manner, image data in the high dynamic range is transmitted to the external device via the transmission path, and information about the transmission method for and/or information about gamma correction for the Image data in the high dynamic range is transmitted to the external device via the same transmission path. For this reason, on the external device, for example, it can be easily understood which transmission method and with which gamma correction method the image data in the high dynamic range are transmitted, and thus the transmission of the image data in the high dynamic range can be performed satisfactorily.

[0016] Furthermore, in the present technology, for example, an information receiving unit that receives the pieces of information about the transmission method for and/or the gamma correction method for the image data in the high dynamic range that the external device may support, which are transmitted from the external device through the transmission path, and a method selection unit that, based on the transmission method information and/or the gamma correction method information that are received in the information receiving unit, selects a predetermined transmission method and/or a predetermined gamma correction method from among the transmission methods for and/or the gamma correction methods for the image data in the high dynamic range that the external device can support can additionally be included, and the data transmission unit can transmit the image data in the high dynamic range as per the transmission method and/or the gamma correction method that are selected in the method selection unit, to the external device via the transmission path.

[0017] In this case, the external device can satisfactorily support the transmission method for and/or the gamma correction method for the image data in the high dynamic range that is transmitted to the external device. For this reason, transmission of image data in the high dynamic range can be performed satisfactorily.

[0018] Furthermore, another concept of the present technology is found in a receiving device including: a data receiving unit that receives image data in a high dynamic range to display an image in the high dynamic range from an external device through a transmission path; an information receiving unit that receives information about a transmission method for and/or gamma correction information for image data in the high dynamic range that is received at the data receiving unit from the external device; and a data processing unit which, based on the transmission method information and/or the gamma correction information that is received at the information receiving unit, processes the image data in the high dynamic range that is received at the data receiving unit.

[0019] In the present technology, the data receiving unit receives the high dynamic range image data to display the high dynamic range image from the external device via the transmission path. For example, the data receiving unit may receive the high dynamic range image data from the external device via transmission path using a differential signal.

[0020] For example, the image data in the high dynamic range may include first data and second data, and the data transmitting and receiving unit may receive the first data and the second data, which are configured in a stipulated frame format for a stereoscopic image, from the external device through the transmission path. Furthermore, for example, the image data in the high dynamic range may include first data and second data, and the data transmitting and receiving unit may receive a first frame image that is configured from the first data and a second frame image. which is configured from the second data, from the external device through the transmission path.

[0021] For example, the image data in the high dynamic range may include first data and second data, and the first data may be low-order 8-bit data of the image in the high dynamic range and the second data may be 8-bit data. high-order data of the image in the high dynamic range, or the first data may be high-order 8-bit data of the image data in the high dynamic range, and the second data may be low-order bit data of the image data in the high dynamic range high.

[0022] The information receiving unit receives the information about the transmission method for and/or the information about the gamma correction for the image data in the high dynamic range that is received at the data receiving unit, from the external device. . Then, the data processing unit processes the high dynamic range image data that is received at the data receiving unit, based on the transmission method information and/or the gamma correction information that is received at the unit. of receiving information.

[0023] For example, the information receiving unit may extract information about the transmission method for and/or information about gamma correction for image data in the high dynamic range from a period of erasure of the image data. in the high dynamic range that is received at the data receiving unit. Furthermore, for example, the information receiving unit may receive information about the transmission method for and/or information about gamma correction for image data in the high dynamic range that is received at the data receiving unit. , from the external device through a control data line that makes up the transmission path.

[0024] Furthermore, for example, the information receiving unit may receive information about the transmission method for and/or information about gamma correction for image data in the high dynamic range that is received at the reception of data, from the external device through a bidirectional communication path that is configured from a predetermined line of the transmission path. So, in this case, the bidirectional communication path may be a pair of differential communication paths, and at least one of the differential communication paths in the pair may have a function of notifying the external device of a connection state using polarization potential. direct current.

[0025] In the present technology, in this way, image data in the high dynamic range that is transmitted from one transmission side is processed based on the transmission method information and/or the gamma correction information that is transmitted from the same transmission side, and thus appropriate processing can be easily performed on image data in the high dynamic range that is received.

[0026] Furthermore, in the present technology, for example, a display control unit may additionally be included that performs a display of whether or not to cancel a power saving mode, on a display unit, when information about the transmission method for the image data in the high dynamic range that is transmitted from the external device is received at the information receiving unit if the power saving mode is selected. Therefore, you can check a user's intent to confirm whether or not to cancel power saving mode.

[0027] Furthermore, in the present technology, for example, an information storage unit in which pieces of information about the transmission method for and/or the gamma correction for image data in the high dynamic range that the image itself information storage unit can support are stored, and an information transmission unit that transmits the information about the transmission method and/or the information about the gamma correction method that are stored in the information storage unit, to the external device via the transmission path may be additionally included. Pieces of information about the transmission method for and/or the gamma correction method for the image data in the high dynamic range that the information storage unit itself can support are transmitted to the transmission side and thus it is possible to receive the image data in the high dynamic range depending on the transmission method and/or the gamma correction method that the information storage unit itself can support, on the transmission side.

[0028] For example, at least one, among information about maximum luminance at which a display is possible, information about a maximum luminance level increase at which processing for high dynamic range is possible, and a flag for prohibiting increase processing, may be additionally stored in the information storage unit.

[0029] Furthermore, for example, a storage control unit may be additionally included that rewrites a flag to prohibit augmentation processing as invalid, which is stored in the information storage unit, if the flag to prohibit augmentation processing is stored on the information storage drive and a power saving mode is selected. Furthermore, for example, a storage control unit may be additionally included that rewrites information about a maximum luminance at which a display is possible and information about a maximum boost luminance level at which processing to the high dynamic range is possible. , which are stored in the information storage unit, if information about the maximum luminance at which display is possible and information about the maximum brightness level at which processing for high dynamic range is possible are stored in the information storage unit. information storage and a power saving mode is selected. Advantageous Effects of the Invention

[0030] According to the present technology, transmission of image data in a high dynamic range can be performed satisfactorily between devices. Furthermore, effects described in the present specification are examples only and thus are not limited to these examples, and additional effects may be present.

Brief Description of the Drawings

[0031] Figure 1 is a block diagram illustrating an example configuration of an AV system according to one embodiment.

[0032] Figure 2 is a block diagram illustrating an example of a configuration of a record player HDMI transmission unit and a television receiver HDMI receiving unit.

[0033] Figure 3 is a diagram illustrating various periods of transmission data that are present when image data of 1,920 rows of pixels and 1,080 rows in columns is transmitted on TMDS channels #0, #1 and #2.

[0034] Figure 4 is a diagram for describing an 8-bit transmission method in the related art.

[0035] Figure 5 is a block diagram illustrating an example configuration of a disc player (source device) that makes up an AV system.

[0036] Figure 6 is a block diagram illustrating an example configuration of a television receiver (synchronized device) that makes up the AV system.

[0037] Figure 7 is a diagram for describing a transmission method (1) of transmitting HDR image data using a deep color transmission format.

[0038] Figure 8 is a diagram for describing a transmission method (2) of transmitting HDR image data using a stereoscopic frame format.

[0039] Figure 9 is a diagram for describing a transmission method (3) of transmitting the HDR image data using a frame format for a high frame rate.

[0040] Figure 10 is a diagram for describing HDR information (1) that is transmitted with a Vendor Specific InfoFrame packet.

[0041] Figure 11 is a diagram for describing HDR information (2) that is transmitted with the Vendor Specific InfoFrame package.

[0042] Figure 12 is a diagram for describing HDR information (3) that is transmitted with the Vendor Specific InfoFrame package.

[0043] Figure 13 is a diagram illustrating an example of an E-EDID data structure that is stored in the synchronized device (television receiver).

[0044] Figure 14 is a diagram illustrating an example of a data structure of an E-EDID Seller Specific region.

[0045] Figure 15 is a diagram illustrating an example of a data structure of an HDMI Vendor Specific InfoFrame package.

[0046] Figure 16 is a diagram illustrating an example of a data structure of a gamma correction method (1) that is transmitted with the Seller Specific InfoFrame package.

[0047] Figure 17 is a diagram illustrating an example of a data structure of a gamma correction method (2) that is transmitted with the Seller Specific InfoFrame package.

[0048] Figure 18 is a diagram illustrating an example of a data structure of a gamma correction method (3) that is transmitted with the Seller Specific InfoFrame package.

[0049] Figure 19 is a flowchart illustrating an example of processing by the source device (disc player) when connecting to a device.

[0050] Figure 20 is a flowchart illustrating an example of processing that selects the HDR transmission method with the source device (disc player).

[0051] Figure 21 is a flowchart (continued) illustrating an example of the processing that selects the HDR transmission method with the source device (disc player).

[0052] Figure 22 is a flowchart illustrating an example of processing that is performed when a power saving mode is set on the synchronized device (television receiver).

[0053] Figure 23 is a flowchart illustrating an example of processing that cancels the power saving mode on the synchronized device (television receiver).

[0054] Figure 24 is a block diagram illustrating an example configuration of a DP system that uses a DP interface.

[0055] Figure 25 is a diagram illustrating an example of a packet structure and the like in a case where transmission of information on the transmission method for and information on the gamma correction method for HDR image data is performed with a channel of AUX.

[0056] Figure 26 is a block diagram illustrating an example configuration of an MHL system using an MHL interface.

[0057] Figure 27 is a diagram illustrating a CBUS packet format.

[0058] Figure 28 illustrates a CBUS packet format in a case where transmission of information on the transmission method for and information about gamma correction for HDR image data over a CBUS/eCBUS line is performed .

Description of Modalities

[0059] Modalities for reducing the practice of the invention (hereinafter called "modalities") are described below. Furthermore, descriptions are provided as follows. 1. Embodiments 2. Examples of Modification

<First Mode> [AV System Setup Example]

[0060] Figure 1 illustrates an example configuration of an Audio Visual (AV) system 10 according to one embodiment. The AV system 10 has a disc player 11 as a source device and a television receiver 12 as a synchronized device. The disc player 11 and the television receiver 12 are connected to each other via an HDMI cable 13 as a transmission path.

[0061] An HDMI terminal 11a, to which an HDMI transmission unit (HDMITX) 11b and a high-speed bus interface (high-speed bus interface) 11c are connected, is provided to the disc player 11. A HDMI terminal 12a, to which an HDMI receiving unit (HDMI RX) 12b and a high-speed bus interface (high-speed bus interface) 12c are connected, is provided to the television receiver 12. One end of the cable of HDMI 13 is connected to the HDMI 11a terminal of the disc player 11, and the other end of the HDMI cable 13 is connected to the HDMI 12a terminal of the television receiver 12.

[0062] In the AV system 10 illustrated in Figure 1, uncompressed image data that is reproduced on the disc player 11 and thus obtained is transmitted to the television receiver 12 via the HDMI cable 13, and an image that results from Image data transmitted from the disc player 11 is displayed on the television receiver 12. Furthermore, the uncompressed voice data that is reproduced on the disc player 11 and thus obtained is transmitted to the television receiver 12 via the HDMI cable. 13, and audio resulting from voice data transmitted from the disc player 11 is produced from the television receiver 12.

[0063] Figure 2 illustrates an example of a configuration of the HDMI transmission unit 11b of the disc player 11 and the HDMI receiving unit 12b of the television receiver 12 in the AV system 10 in Figure 1. During a picture period effective period 14 (hereinafter appropriately referred to as active video period) (refer to Figure 3), a period resulting from excluding a horizontal blanking period 15 and a vertical blanking period 16 from a period of a vertical synchronization signal for the next vertical synchronization signal, the HDMI transmission unit 11b transmits a differential signal corresponding to uncompressed pixel data for an image for a screen, in one direction, to the HDMI reception unit 12b. Furthermore, during the horizontal blanking period 15 and the vertical blanking period 16, the HDMI transmission unit 11b transmits the differential signal corresponding to voice data or control data that is associated with at least one image, other items auxiliary data, and the like, to the HDMI 12b receiving unit in one direction on multiple channels.

[0064] That is, the HDMI transmission unit 11b has an HDMI transmitter 21. The transmitter 21, for example, converts uncompressed image pixel data into the corresponding differential signal, and serially transmits the conversion result to the unit of HDMI 12b reception on multiple channels, three Transition Minimized Differential Signaling (TMDS) channels #0, #1 and #2, in one direction.

[0065] Furthermore, the transmitter 21 converts the voice data associated with an uncompressed image, the necessary control data, other auxiliary data items, and the like into the corresponding differential signal and serially transmits the conversion result to the HDMI 12b reception between one direction on the three channels of TMDS #0, #1 and #2. Additionally, the transmitter 21 transmits a pixel clock that is synchronized with the pixel data that is transmitted on the three TMDS channels #0, #1 and #2, to the HDMI receiving unit 12b on a TMDS clock channel. . At this time, 10-bit pixel data is transmitted in a clock that is the pixel clock on a TMDS channel #i (i = 0, 1, 2).

[0066] During the active video period 14 (refer to Figure 3), the HDMI receiving unit 12b receives the differential signal that is transmitted in one direction from the HDMI transmitting unit 11b, and which corresponds to the pixel data , on multiple channels. Furthermore, during the horizontal blanking period 15 (refer to Figure 3) or the vertical blanking period 16 (refer to Figure 3), the HDMI receiving unit 12b receives the differential signal that is received in one direction of the HDMI 11b transmission unit, which corresponds to voice data or control data, on multiple channels.

[0067] That is, the HDMI receiving unit 12b has an HDMI receiver 22. On TMDS channels #0, #1 and #2, the receiver 22 receives the differential signal that is received in one direction from the transmitting unit of HDMI 11b which is connected via the HDMI cable 13 and which corresponds to the pixel data, and the differential signal which corresponds to the voice data or the control data. At this time, the differential signals are synchronized with the pixel clock that is similarly transmitted on the TMDS clock channel of the HDMI transmission unit 11b and are thus received.

[0068] In addition to the three TMDS channels #0 to #2 as transmission channels for transmitting the pixel data and voice data and the TMDS clock channel as transmission channels for transmitting the pixel clock, transmission channels for an HDMI system that is configured from the HDMI source transmit unit 11b and the HDMI receive unit 12b includes a transmission channel called a Display Data Channel (DDC) 23 or a Consumer Electronics Control line ( CEC) 24.

[0069] The DDC 23 is made of two signal lines that are included in the HDMI cable 13. The HDMI transmission unit 11b uses the DDC 23 in order to read Enhanced Extended Display Identification Data (E-EDID) from the HDMI receiving unit 12b which is connected via the HDMI cable 13. That is, in addition to the HDMI receiver 22, the HDMI receiving unit 12b has an EDID Read Only Memory (ROM) in which E-EDID, which is capacity information relative to your own configuration capacity, is stored.

[0070] The HDMI transmitting unit 11b reads, via the DDC 23, the E-EDID on the HDMI receiving unit 12b from the HDMI receiving unit 12b which is connected via the HDMI cable 13. Then, based on the E -EDID, the HDMI transmitting unit 11b recognizes setting capacity setting of the HDMI receiving unit 12b, that is, for example, a format of an image (profile), such as RGB, YCbCr 4:4:4, YCbCr 4:2:2, which an electronic device having the HDMI 12b receiving unit supports.

[0071] The CEC line 24 is made from a signal line that is included in the HDMI cable 13, and is used to perform bidirectional control data communication between the HDMI transmitting unit 11b and the HDMI receiving unit 12b. Additionally, a line (HPD line) 25 that is connected to a pin called Hot Plug Detection (HPD) is included on the HDMI cable 13.

[0072] The source device uses line 25 and thus can detect the connection to the synchronized device using direct current bias potential. In this case, from the perspective of the source device, the HPD line has a function of receiving a connection status notification from the synchronized device using the direct current bias potential. On the other hand, from the perspective of the synchronized device, the HPD line has a function of notifying the source device of the connection status using the direct current bias potential.

[0073] Additionally, a line (power source line) 26 that is used to provide electrical power from the source device to the synchronized device is included in the HDMI cable 13. Additionally, a backup line 27 is included in the cable of HDMI 13. In some cases, a pair of differential transmission paths are configured from the HPD line 25 and the reserve line 27 and are used as a bidirectional transmission path.

[0074] Figure 3 illustrates various periods of transmission data that are present when image data of 1,920 rows of pixels and 1,080 rows in columns is transmitted on TMDS channels #0, #1 and #2. Three types of periods, a video data period 17, a data island period 18, and a control period 19 are present in a video field in which broadcast data is transmitted on the three TMDS channels #0, # 1 and #2 of HDMI, depending on types of transmission data.

[0075] At this time, the video field period is a period from an active edge of a certain vertical sync signal to an active edge of the next vertical sync signal, and is divided into a horizontal blanking period 15, a period vertical blanking period 16, and the effective pixel period 14 (active video), which is a period that results from excluding the horizontal blanking period and the vertical blanking period from the video field period.

[0076] Video data period 17 is named after effective pixel period 14. During video data period 17, data about the effective pixel (Active Pixel) for 1920 pixels x 1080 lines comprising uncompressed image data for an image are transmitted. The data island period 18 and the control period 19 are named the horizontal blanking period 15 and the vertical blanking period 16. During the data island period 18 and the control period 19, auxiliary data is transmitted.

[0077] That is, the data island period 18 is named after a portion of the horizontal blanking period 15 and the vertical blanking period 16. During the data island period 18, for example, a voice data packet and similar data that are not related to control, among the auxiliary data items, are transmitted. The control period 19 is named the other portion of the horizontal blanking period 15 and the vertical blanking period 16. During the control period 19, for example, a vertical sync signal and a horizontal sync signal, a control packet , and similar data relating to the control, among the auxiliary data items, are transmitted.

[0078] According to the embodiment, via the HDMI cable 13 the disc player 11 receives, from the television receiver 12, pieces of information about a transmission method and a gamma correction method for the image data in a high dynamic range that the television receiver 12 can support. High dynamic range is then appropriately abbreviated to "HDR". In this case, the television receiver 12 stores in a storage unit pieces of information about the transmission method for and the gamma correction method for HDR image data that the television receiver 12 itself supports, and transmits the information about the transmission method and information about the gamma correction method to the disc player 11 via the HDMI cable 13. Furthermore, in the related art, there is no transmission descriptive report for the HDR image and no compatibility between cameras.

[0079] Based on the transmission method information and the gamma correction method information that are received from the television receiver 12, the disc player 11 selects a predetermined transmission method and a gamma correction method from among the transmission methods for the HDR image data that the television receiver can support. In this case, for example, if each of the transmission methods and gamma correction methods for HDR image data that the television receiver 12 can support is two or more in number, the disc player 11 selects the method of transmission which is small in image deterioration and the gamma correction method with which the easiest approximation is possible.

[0080] The disc player 11 transmits the HDR image data according to the selected transmission method and gamma correction method to the television receiver 12 via the HDMI cable 13. At this time, the disc player 11 transmits the information about the method for transmitting the HDR image data to be transmitted and information about gamma correction to the television receiver 12 via the HDMI cable 13.

[0081] Via the HDMI cable 13, the television receiver 12 receives the HDR image data and receives the transmission method information and the gamma correction information for the HDR image data from the disc player 11. The television receiver 12 processes the received HDR image data based on the received information about the transmission method and the gamma correction information, and generates the HDR image data for display. Maximum luminance of an object in the natural world is equal to or greater than 2,000 cd/m2.

[0082] In the related art, for example, luminance is adjusted on the assumption that image data that is recorded on the disc player is displayed on a display device with a descriptive report of a maximum luminance of 100 cd/m2. In other words, in the related technique, the image data is greatly compressed in luminance, compared to a luminance value available in the natural world. Furthermore, the maximum luminance of the display device has been extended in practice to 1000 cd/m2, exceeding 100 cd/m2 in the related art. When processing that increases a luminance value from image data originally set at 100 cd/m2 to 1000 cd/m2 is performed on the display device, an image quality problem occurs.

[0083] HDR imaging is proposed in order to realize a high luminance image in which a luminance white level is 100% or more. The 100% luminance white level is typically expressed as a bit value of 235 or 255 in an 8-bit system. 8 or more bits are required for grayscale in order to express luminance exceeding the white level of 100% luminance. In other words, HDR image data is image data that is 10 bits, 12 bits, 16 bits, and similar in length.

[0084] Figure 4 is a diagram illustrating an 8-bit transmission method in the related art. Figure 4(a) illustrates an example of an original white level of 10-bit HDR image data and the bit value associated with the original white level. Figure 4(b) illustrates an example of the luminance level of 8-bit image data that is converted in order to transmit 10-bit HDR image data using the 8-bit transmission method and the bit value associated with the luminance level. In this case, because a 100% luminance level is assigned an 8-bit value of "235", 200% luminance is "255", which is a maximum value of the 8-bit value, and luminance compression is performed, thereby resulting in information whose luminance exceeds 108% being lost. Disc Player Configuration Example

[0085] Figure 5 is an example configuration of the disc player 11. The disc player 11 has the HDMI terminal 11a, the HDMI transmission unit 11b, and the high-speed interface bus 11c. Additionally, the disc player 11 has a Central Processing Unit (CPU) 104, an internal bus 105, a flash Read-Only Memory (ROM) 106, a Synchronous Random Access Memory (SDRAM) 107, a remote control 108, and a remote control transmission unit 109.

[0086] Additionally, the disc player 11 has a Serial Advanced Technology Connection (SATA) interface 110, a Blu-ray Disc (BD) drive 111, an Ethernet (I/F) interface 112, and a network terminal 113. Additionally, the disc player 11 has a Moving Frame Expert Group (MPEG) decoder 115, a graphics generating circuit 116, a frame output terminal 117, a voice circuit 118, and an HDR processing circuit 114.

[0087] Additionally, the record player 11 may have a display control unit 121, a panel excitation circuit 122, a display panel 123, and a power supply unit 124. Additionally, "Ethernet" is a registered trademark. The high-speed bus interface 11c, the CPU 104, the flash ROM 106, the SDRAM 107, the remote control receiving unit 108, the SATA interface 110, the Ethernet interface 112, and the MPEG decoder 115 are connected to internal bus 105.

[0088] The CPU 104 controls the operation of each unit of the disc player 11. The flash ROM 106 contains control software and stores the data. The SDRAM 107 makes up a working area of the CPU 104. The CPU 104 deploys into the SDRAM 107 the software or data that is read from the flash ROM 106, starts the software, and controls each unit of the disc player 11.

[0089] The remote control receiving unit 108 receives a remote control signal (remote control code) that is transmitted from the remote control transmitting unit 109 and provides the received remote control signal to the CPU 104. The CPU 104 controls each record player unit 11 according to the remote control code. Further, according to the embodiment, the remote control unit is illustrated as the user instruction input unit, but the user instruction input unit may have different configurations, such as a touch panel unit that performs an instruction input using a key, a wheel, and proximity/touch, a gesture input unit that detects instruction input using a mouse, a keyboard, and a camera, and a voice input unit that performs the instruction input using voice.

[0090] The BD drive 101 writes content data to a BD disc (not illustrated) as a disc-shaped recording medium, or plays back the content data from the BD. The BD unit 111 is connected to the internal bus 105 via the SATA interface 110. The MPEG decoder 115 performs encoding processing on an MPEG 2 stream played on the BD unit 111 and thereby obtains image data and voice data.

[0091] The graphics generating circuit 116 performs graphics data convolution and similar processing on the image data that is obtained in the MPEG decoder 115, whenever necessary. The frame output terminal 117 produces the image data that is produced from the graphics generating circuit 116. The voice output terminal 118 produces the voice data that is obtained from the MPEG decoder 115.

[0092] Panel excitation circuit 122 excites display panel 123, based on frame (image) data that is produced from graphics generating circuit 260. Display control unit 121 controls the graphics generating circuit 116 or the panel excitation circuit 122 and thus controls the display on the display panel 123. For example, the display panel 123 is configured from a Liquid Crystal Display (LCD), a Plasma Display Panel (PDP), an Organic Electroluminescence (EL) panel, or similar.

[0093] Furthermore, according to the embodiment, the example in which the display control unit 121 is provided outside the CPU 104 is illustrated, but the CPU 104 can directly control the display on the display panel 123. Furthermore, the CPU 104 and the display control unit 121 may be integrated on one chip, and may be multi-core. The power source unit 124 provides electrical power to each disc player unit 11. The power source unit 124 may be an AC power source and a battery (a storage battery or a dry cell battery).

[0094] With HDMI-compliant communication, the HDMI transmission unit (HDMI source) 11b produces the image data (frame) or the voice data with a baseband of the HDMI terminal 11a. The high-speed bus interface 11c is an interface for the bidirectional communication path that is configured from predetermined lines (one backup line and one HPD line according to the embodiment) that make up the HDMI cable 13.

[0095] The high-speed bus interface 11c is inserted between the Ethernet interface 112 and the HDMI terminal 101. The high-speed bus interface 11c transmits the transmission data that is provided from the CPU 104, from the HDMI terminal 101 to the other party's device via the HDMI cable 13. Furthermore, the high-speed bus interface 11c provides reception data received from the other party's device via the HDMI terminal 11a of the HDMI cable 13 to the CPU 104.

[0096] When the HDR image data for displaying the HDR image, among the image data items that are obtained in the MPEG decoder 115, are transmitted on the HDMI TMDS channel, the HDR processing circuit 114 processes HDR image data in a state according to the transmission method. At this time, the HDR image data is configured to conform to a deep color image format, or is configured to conform to a stereoscopic image data format, or is configured to conform to a high-frame graphics format. The HDR processing circuit 114 and the HDMI transmission unit 11b, although integrated on one chip, may be multi-core. Types of transmission methods for HDR image data, selection of the transmission method, a packet formation of each method, and the like are described in detail below.

[0097] Operation of the disc player 11 illustrated in Figure 5 is briefly described. At the time of recording, content data is obtained by a digital tuner not shown, the Ethernet interface 112 of the network terminal 113, or the high-speed bus interface 11c of the HDMI terminal 11a. Content data is input to the SATA interface 110 and is written to a BD by the BD drive 111. In some cases, content data may be written to a hard disk drive (HDD) connected to the SATA interface 110, which is not illustrated.

[0098] At playback time, the content data (MPEG stream) that is played from the BD by the BD unit 111 is provided to the MPEG decoder 115 via the SATA interface 110. In the MPEG decoder 115, decoding processing is performed on the played content data, and the image data or voice data with the baseband. Image data is output to frame output terminal 117 by graphics generating circuit 116. Additionally, voice data is output to voice output terminal 118.

[0099] Furthermore, at the time of playback, according to a user's operation, the image data obtained in the MPEG decoder 115 is provided to the panel excitation circuit 122 by the graphics generation circuit 116, and an image playback image is displayed on the display panel 123. Furthermore, according to the user's operation, the voice data obtained in the MPEG decoder 115 is provided to a speaker not illustrated, and voice corresponding to the playback image is produced.

[00100] Furthermore, at the time of playback, if the image data or voice data obtained from the MPEG 115 decoder is transmitted on the HDMI TMDS channel, the image data and voice data are provided to the HDMI 11b transmission, and thus are packaged and output from the HDMI 11b transmission unit to the HDMI 11a terminal.

[00101] Furthermore, if the image data is HDR image data, the HDR image data is processed, by the HDR processing circuit 114, in the state according to the selected transmission method and is then provided to the unit HDMI 11b transmission. Furthermore, at the time of playback, when the content data played on the BD drive 111 is sent to a network, the content data is output to the network terminal 113 via the Ethernet interface 112. Likewise, at the time of playback , when the content data played on the BD unit 111 is sent to the bidirectional communication path of the HDMI cable 13, the content data is output to the HDMI terminal 11a by the high-speed bus interface 11c. At this time, before producing the image data, the image data can be encoded using copyright protection technology, such as HDCP, DTCP, and DTCP+, and thus transmitted.

[Television Receiver Configuration Example]

[00102] Figure 6 illustrates an example configuration of the television receiver 12. The television receiver 12 has the HDMI terminal 12a, the HDMI receiving unit 12b, the high-speed bus interface 12c, and the processing circuit of HDR 204. Additionally, the television receiver 12 has an antenna terminal 205, a digital tuner 206, an MPEG decoder 207, a frame signal processing circuit 208, a graphics generating circuit 209, a excitation panel 210, and a display panel 211.

[00103] Additionally, the television receiver 12 has a voice signal processing circuit 212, a voice amplification circuit 213, a speaker 214, an internal bus 220, a CPU 221, a flash ROM 222, and a synchronous random access memory (SDRAM) 223. Additionally, the television receiver 12 has an Ethernet (I/F) interface 224, a network terminal 225, a remote control receiving unit 226, and a remote control transmission unit 227. Furthermore, the television receiver 12 has a display control unit 231 and the power supply unit 232. Furthermore, "Ethernet" is a registered trademark.

[00104] Antenna terminal 205 is a terminal into which to input a broadcast television signal received into a receiving antenna (not illustrated). The digital tuner 206 processes the broadcast television signal that is input to the antenna terminal 205 and thereby extracts a partial Transport Stream (TS) (TS packets of the frame image, and TS packets of the voice data) from a predetermined transport stream that corresponds to a user-selected channel.

[00105] Additionally, the digital tuner 206 takes Program Specific Information/Service Information (PSI/SI) out of the obtained transport stream, and outputs the PSI/SI to the CPU 221. Processing that extracts the partial TS into a arbitrary channel of the multiple transport streams obtained in the digital tuner 206 is possible by obtaining information about a packet ID (PID) on the arbitrary channel of the PSI/SI (PAT/PMT).

[00106] The MPEG decoder 207 performs decoding processing on a frame Packed Elementary Stream (PES), which is configured from the TS packets of the frame data that are obtained at the digital tuner 206, and thus obtains the image data . Furthermore, the MPEG decoder 207 performs decoding processing on a PED voice packet that is configured from the TS packet of the voice data that is obtained from the digital tuner 206, and thus obtains the voice data.

[00107] The frame signal processing circuit 208 and the graphics generation circuit 209 perform grading process (resolution conversion processing), convolution processing of the graphics data, the gamma correction of the HDR image data , and similar in the image data obtained in the MPEG decoder 207 or the image data received in an HDMI receiving unit 202, whenever necessary.

[00108] The panel excitation circuit 210 excites the display panel 211, based on the frame (image) data that is produced from the graphics generating circuit 209. The display control unit 231 controls the graphics generating circuit 209 or the panel excitation circuit 210 and thus controls the display on the display panel 211. The display panel 211, for example, is configured from a Liquid Crystal Display (LCD), a Pasma Display Panel (PDP) , an Organic Electroluminescence (EL) panel, or similar.

[00109] Furthermore, according to the embodiment, the example in which the display control unit 231 is provided in addition to the CPU 221 is illustrated, but the CPU 221 can directly control the display on the display panel 211. Furthermore, the CPU 221 and the display control unit 231 may be integrated on one chip, and may be multi-core. The power source unit 232 provides electrical power to each unit of the television receiver 12. The power source unit 232 may be an AC power source and a battery (a storage battery or a dry cell battery).

[00110] The voice signal processing circuit 212 performs necessary processing, such as D/A conversion, on the voice data obtained from the MPEG decoder 207. The voice amplification circuit 213 amplifies a voice signal that is produced of the speech signal processing circuit 212, and thus provides the amplified speech signal to a speaker 214. Furthermore, the speaker 214 may be monophonic or stereophonic. Furthermore, there may be one or there may be two or more speakers 214. Furthermore, the speaker 214 may be earphones or headphones. Furthermore, the speaker 214 can correspond to 2.1 channels, 5.1 channels, and the like. Furthermore, the speaker 214 can be connected to the television receiver 12 in a wireless manner. Additionally, speaker 214 may be another device.

[00111] The CPU 221 controls the operation of each unit of the television receiver 12. The flash ROM 222 contains control software and stores the data. The DRAM 223 makes up a working area of the CPU 221. The CPU 221 deploys into the SDRAM 223 software and data that are read from the flash ROM 222, and thus starts the software and controls each unit of the television receiver 12.

[00112] The remote control receiving unit 226 receives the remote control signal (remote control code) that is transmitted from the remote control transmitting unit 227 and provides the received remote control signal to the CPU 221. The CPU 221 controls each television receiver unit 12, based on the remote control code. Further, according to the embodiment, the remote control unit is illustrated as the user instruction input unit, but the user instruction input unit may have different configurations, such as a touch panel unit that performs an instruction input using proximity/touch, a gesture input unit that detects an instruction input using a mouse, a keyboard, and a camera, and a voice input unit that performs the instruction input using voice.

[00113] The network terminal 225 is a terminal that is connected to the network, and is connected to the Ethernet interface 224. The high-speed bus interface 12c, the CPU 221, the flash ROM 222, the SDRAM 223, the of Ethernet 224, the MPEG decoder 207, and the display control unit 231 are connected to the internal bus 220.

[00114] With HDMI-compliant communication, the HDMI receiving unit (HDMI sync) 12b receives image data (frame) or voice data with the baseband, which is provided to the HDMI terminal 12a through of the HDMI cable 13. Like the high-speed bus interface 11c of the disc player 11 described above, the high-speed bus interface 12c is an interface for the bidirectional communication path that is configured from predetermined lines (the reserve and the HPD line according to the modality) that make up the HDMI cable 13.

[00115] The high-speed bus interface 12c is inserted between the Ethernet interface 224 and the HDMI terminal 201. The high-speed bus interface 12c transmits the transmission data that is provided from the CPU 221, from the HDMI terminal 12a to the other party's device via the HDMI cable 13. Furthermore, the high-speed bus interface 12c provides the receiving data received from the other party's device via the HDMI 12a terminal of the HDMI cable 13 to the CPU 221 .

[00116] If the image data received at the HDMI receiving unit 202 is the HDR image data, the HDR processing circuit 204 performs processing (decoding processing) corresponding to the transmission method, on that image data. HDR, and thus generates HDR image data. That is, the HDR processing circuit 204 performs processing inverse to the processing by the HDR processing circuit 114 of the disc player 11 described above, and thus obtains data that makes up the HDR image data. The HDR processing circuit 204 and the HDMI receiving unit 202, or the HDR processing circuit 204 and the frame signal processing circuit 208 may be integrated on one chip, or may be multiple cores.

[00117] Additionally, the HDR processing circuit 204 performs an arithmetic operation that generates HDR image data from first data that is configured from low-order 8-bit image data of the HDR image and second data that is configured configured from high-order 8-bit image data of the HDR image, or first data that is configured from the high-order 8-bit image data of the HDR image and second data that is configured from the 8-bit image data low-order HDR image.

[00118] Furthermore, for example, when received content data is sent to a network, the content data is output to network terminal 225 via Ethernet interface 224. Likewise, when received content data is sent to the HDMI cable bidirectional communication path 13, content data is output to the HDMI terminal 11a via the high-speed bus interface 12c. At this time, before producing the image data, the image data can be encoded using copyright protection technology, such as HDCP, DTCP, and DTCP+, and thus can be transmitted.

[00119] Operation of the television receiver 12 illustrated in Figure 6 is briefly described. The broadcast television signal that is input to the antenna terminal 205 is provided to the digital tuner 206. At the digital tuner 206, the broadcast television signal is processed, a predetermined transport stream corresponding to the channel selected by the user is produced, a partial Transport Stream (TS) (the frame image TS packets, and the voice data TS packets) is extracted from the transport stream, and the partial TS is provided to the MPEG 207 decoder.

[00120] In the MPEG decoder 207, decoding processing is performed on a frame PES packet that is configured from the frame data TS packet, and thus the frame data is obtained. Graduation processing (resolution conversion processing), and convolution processing of the graphics data are performed on the frame data, whenever necessary, in the frame signal processing circuit 208 and the graphics generation circuit 209, and then the frame data is provided to the panel excitation circuit 210. For this reason, the image corresponding to the channel selected by the user is displayed on the display panel 211.

[00121] Furthermore, in the MPEG decoder 207, decoding processing is performed on a PES voice packet that is configured from the voice data TS packet, and thus the voice data is obtained. Necessary processing such as D/A conversion is performed on the voice data in the voice signal processing circuit 212, the voice data is further amplified by the voice amplification circuit 213, and then the voice data is provided to the speaker 214. For this reason, the voice corresponding to the user-selected channel is produced from speaker 214.

[00122] Furthermore, content data (image data and voice data) that is provided from the network terminal 225 to the Ethernet interface 224, or that is provided from the HDMI terminal 12a via the Ethernet bus interface high speed 12c, are provided to the MPEG decoder 207. Subsequently, the same operation as when the television broadcast signal is received is performed, and thus the image is displayed on the display panel 211 and the voice is produced from the speaker 214.

[00123] Furthermore, in the HDMI receiving unit 12b, the image data and voice data that are obtained are transmitted from the disc player 11 which is connected to the HDMI terminal 12a via the HDMI cable 13. The data image data are provided to the frame signal processing circuit 208 by the HDR processing circuit 204. Furthermore, the voice data is provided directly to the voice signal processing circuit 212. Subsequently, the same operation as when the signal broadcast television is received is performed, and thus the image is displayed on the display panel 211 and the voice is produced from the speaker 214.

[00124] Furthermore, if the image data received at the HDMI receiving unit 12b is the HDR image data, in the HDR processing circuit 204, processing (decoding processing) corresponding to the transmission method is performed into this HDR image data, and thus the HDR image data is generated. Then, the HDR image data is provided from the HDR processing circuit 204 to the frame signal processing unit 208. Furthermore, in the frame signal processing circuit 208, if the HDR image data is provided, the image data for displaying the HDR image is generated based on the HDR image data, and the gamma correction is performed based on the gamma correction information that is received at the HDMI receiving unit 12b. For this reason, the HDR image is displayed on the display panel 211. Transmission Method for HDR Image Data

[00125] Next, the transmission method for HDR image data is described. First, a case where HDR image data in an original signal is configured from image data that is 8 or more bits in length is described. At this time, as illustrated in Figures 7 to 9, a case where each HDR image data item in Figures 7 to 9 is image data in 1920 x 1080 p pixel format is described.

[00126] It is considered that when the original signal is transmitted with a baseband digital interface, for example, the following three transmission methods are used. These methods are the most desirable methods because transmission is possible without decreasing an original signal one degree. However, because a transmission bandwidth needs to be 1.2 times or more of the image data in the 1920 x 1080p 8-bit pixel format, transmission is possible when there is space in the transmission bandwidth.

[00127] Transmission method (1) is a method in which transmission is performed using a deep color transmission format as illustrated in Figure 7. In this case, the 1920 x 1080p pixel format is selected for the format image, and information naming the number of bits per pixel as any of "DC-48 bits", "DC-36 bits", and "DC-30 bits" which are described below, and transmission information of HDR to be set again are transmitted together. In this case, because all pieces of pixel data cannot be transmitted with one pixel block, pixel mapping processing is required in the HDR processing circuit 114 or the HDMI transmission unit 11b.

[00128] In transmission method (2), as illustrated in Figure 8, 8 low-order bits of HDR image data are arranged in a region of left eye image data in a stereoscopic frame format, and the bits remaining high-order HDR image data is arranged in a right-eye image data region in stereoscopic frame format, and thus HDR image data is transmitted. In this case, a frame format called 1920 x 1080p frame packing is designated as the frame format, and it is transmitted together with the information about the HDR transmission method to be set again without designating the stereoscopic frame format. In this case, slice processing of the low-order 8-bit image data and the high-order bit image data and processing for bit mapping to a predetermined stereoscopic frame format are required in the HDR processing circuit 114.

[00129] Furthermore, the description is provided above to the effect that the remaining high-order bits of the HDR image data are arranged in the left eye image data region in the stereoscopic frame format and are thus transmitted. That is, when the HDR image data is 10-bit image data, 12-bit image data, and 16-bit image data, the remaining high-order bits of the HD image data are 2 bits, 4 bits, and 8 bits, respectively. It is also considered that instead of the remaining high-order bits, the 8 high-order bits of the HDR image data are arranged in the right-eye image data region in the stereoscopic frame format and are thus transmitted.

[00130] Furthermore, the description is provided above to the effect that the low-order 8 bits of the HDR image data are arranged in the left-eye image data region in stereoscopic frame format, and the high-order bits remaining HDR image data is arranged in a right eye image data region in stereoscopic frame format, and thus HDR image data is transmitted. However, it is also considered that the low-order 8 bits of the HDR image data are arranged in the left-eye image data region in stereoscopic frame format, and the remaining high-order bits of the HDR image data are arranged in a right eye image data region in stereoscopic frame format, and HDR image data is transmitted.

[00131] Furthermore, the description is provided above to the effect that the low-order 8 bits of the HDR image data are arranged in the left-eye image data region in stereoscopic frame format, and the high-order bits remaining HDR image data is arranged in a right eye image data region in stereoscopic frame format, and thus HDR image data is transmitted. However, it is also considered that the high-order 8 bits of the HDR image data are arranged in the left-eye image data region in stereoscopic frame format, and the remaining low-order bits of the HDR image data are arranged in the right eye image data region in stereoscopic frame format, and thus HDR image data is transmitted.

[00132] The transmission method (3) is a transmission method in which, as illustrated in Figure 9, the 8 low-order bits of the HDR image data are arranged in a first frame image data region with a high frame rate, and the remaining high-order bits of the HDR image data are arranged in a second frame image data region, and thus the HDR image data is transmitted. In this case, a normal frame format of 1920 x 1080p for a high frame rate is designated as the frame format, and is transmitted together with information about the HDR transmission method to be set again. In this case, 8-bit slice processing of the low-order image data and the high-order bit image data and processing for bit mapping to a predetermined image format for the high frame rate are required in the image circuit. HDR 114 processing.

[00133] Furthermore, the description is provided above to the effect that the remaining high-order bits of the HDR image data are arranged in the second frame image data region and are thus transmitted. That is, when the HDR image data is 10-bit image data, 12-bit image data, and 16-bit image data, the remaining high-order bits of the HDR image data are 2 bits, 4 bits, and 8 bits, respectively. It is also considered that instead of the remaining high-order bits, the 8 high-order bits of the HDR image data are arranged in the second frame image data region and are thus transmitted.

[00134] Furthermore, the description is provided above to the effect that the low-order 8 bits of the HDR image data are arranged in the first frame image data region with the high frame rate, and the high-order bits Remaining HDR image data is arranged in the second image data region frame, and thus HDR image data is transmitted. However, it is also considered that the low-order 8 bits of the DR image data are arranged in the second frame image data region with the high frame rate, and the remaining high-order bits of the HDR image data are arranged in the first frame image data region, and thus the HDR image data is transmitted.

[00135] Furthermore, the description is provided above to the effect that the low-order 8 bits of the HDR image data are arranged in the first frame image data region with the high frame rate, and the high-order bits remaining order of the HDR image data is arranged in the second image data region frame, and thus the HDR image data is transmitted. However, it is also considered that the high-order 8 bits of the HDR image data are arranged in the first frame image data region with the high frame rate, and the remaining low-order bits of the HDR image data are arranged in the second frame image data region, and thus HDR image data is transmitted.

[00136] Furthermore, in the cases of transmission methods (2) and (3), the HDR processing circuit 204 of the television receiver 12, described above, performs processing that separately extracts the 8 low-order bits of the HDR data. HDR image and the high-order bits, or the 8 high-order bits and the low-order bits, of the stereoscopic frame format or the high frame rate frame format, respectively.

[Gamma Correction Method for HDR Image Data]

[00137] Next, a gamma correction method for HDR image data is described.

[00138] In the gamma correction method (1), as illustrated in Figure 10, a gamma correction curve can be approximated by assigning a luminance level of the display panel 211 that is assumed at the time of 100% luminance, a maximum luminance level of the HDR image to be transmitted, a bit value of the image data indicating 0% luminance, a bit value of the image data indicating 100% luminance, and a bit value of the image data indicating a maximum white level that is expressed in the HDR image, and the HDR image being considered can be displayed by performing image correction based on the approximate curve.

[00139] In the gamma correction method (2), as illustrated in Figure 11, the gamma correction curve can be approximated by assigning an output luminance level of the display panel 211 that is assumed at the time of an input level named luminance level, a luminance dynamic range value of the HDR image being transmitted, and a maximum luminance level, and the HDR image being assumed can be displayed by performing approximate curve-based image correction.

[00140] In the gamma correction method (3), as illustrated in Figure 12, the gamma correction curve can be approximated by assigning a luminance level at the time of 100% luminance that is defined in ITU-R BT.1886 , a luminance level at the time of 0% luminance, a gamma value, and the HDR image being assumed can be displayed by performing image correction based on the approximate curve.

[Example of an EDID Data Structure]

[00141] Figure 13 illustrates an example of an E-EDID data structure. The E-EDID is made up of a basic block and an extension block. Data that is prescribed with E-EDID 1.3 specifications that are expressed as "E-EDID 1.3 Basic Structure" is arranged in a basic block head. Subsequently, timing information to maintain compatibility with the previous EDID, which is expressed as "Preferred Timing", and timing information other than "Preferred Timing" to maintain compatibility with the previous EDID, which is expressed as "2timing", are arranged .

[00142] Furthermore, in the basic block, subsequent to the "2nd timing", information indicating a name of the display device which is expressed as "Monitor Name", and information indicating the number of pixels that are available for display in the case of an aspect ratio of 4 to 3 or 16 to 9, which are expressed as "Monitor Gamma Limits", are arranged sequentially.

[00143] In an extension block head, an image size (resolution) that is available for display, a frame rate, information indicating whether the display is interlaced or progressive, data containing a description of information such as a ratio of aspect, which are expressed as "Short Video Descriptor", and a method of encoding and decoding reproducible voice, a sampling frequency, a cutoff band, and data containing a description of information such as the number of codec bits, which are expressed as "Short Audio Descriptor", and information relating to left and right speakers, which is expressed as "Speaker Allocation", are arranged sequentially.

[00144] Additionally, in the extension block, subsequent to "Speaker Allocation", data that is defined specifically for every manufacturer, which is expressed as "Vendor Specific", timing information to maintain compatibility with the previous EDID , which is expressed as "3rd timing", and timing information to maintain compatibility with the previous EDID, which is expressed as "4th timing", are arranged.

[Example of the Data Structure of a Vendor-Specific Data Block (VSDB) Region]

[00145] According to the embodiment, the data area that is extended to store the HDR image information is defined in the VSDB region. Figure 14 illustrates an example of a data structure for a VSDB region. 0th to Nth blocks, each of which is a byte block, are provided in the VSDB region.

[00146] A data region of the HDR image information that the synchronized device (the television receiver 12 according to the embodiment) has to store is defined in a fourth bit of an eighth byte and in (M + 1)- th to (M + 3)-th bytes subsequent to 0-th to M-th byte already defined.

[00147] First, 0th to 8th bytes are described. A header indicating a data region that is expressed as "Vendor Specific Tag Code (=3)", and information indicating a length of the VSDB data that is expressed as "Length (=N)" are arranged in the 0th byte arranged in the head of the data, which is expressed as "Vendor Specific". Additionally, information indicating a number "0x000C03" that is registered to HDMI(R), which is expressed as "24-bit IEEE Register Identifier (0x000C03) LSB first" is arranged in first to third bytes.

[00148] Additionally, information indicating a 24-bit physical address of the synchronized device, which is expressed by each of "A", "B", "C" and "D" is arranged in fourth to fifth bytes. A flag indicating a function that the synced device supports, which is expressed as "Supports-AI", each piece of information naming the number of bits per pixel, which is expressed as each "DC-48 bits", "DC-36 bits", and "DC30 bits", a flag indicating whether the synchronized device supports transmission of a YCbCr 4:4:4 image, which is expressed as "DCY 444", and a flag indicating whether the synchronized device supports an Interface Digital Visual (DVI), which is expressed as "DVI-Dual", are arranged in a sixth byte.

[00149] Furthermore, information indicating a maximum frequency of a TMDS pixel clock, which is expressed as "Max-TMDS-Clock" is arranged in a seventh byte. Information flags naming the presence of a latency field, information naming the presence of an interlacing latency field, information naming the presence of extension of a 3D video format, and information naming support of a function of a content type ( CNC) are arranged in an eighth byte. In a fourth bit of the eighth byte, a flag indicating whether or not HDR information that the synchronized device supports is present is newly arranged. If the flag is True, this indicates that HDR-related information is present in (15 + M)-th to (18 + M)-th bytes.

[00150] Next, the (15 + M) to (18 + M)-th bytes are described. Whether or not processing relating to an HDR function is prohibited on the source device is indicated in a seventh bit of the (15+M)-th byte. Data indicating the three video formats (transmission methods (1) to (3) described above) of the HDR image that the synchronized device supports are written in each of the sixth to fourth bits of the (15 + M)-th byte .

[00151] If methods other than this are proposed, third to 0-th bits of the (15 + M)-th byte are available for naming. Data indicating the three gamma correction methods for the HDR image that the synchronized device supports is written in each of the seventh to fifth bits of the (16+M)-th byte. If gamma correction methods other than this are proposed, fourth to 0th bits of the (16 + M)th byte are available for naming.

[00152] As an example, if a seventh bit is True, processing, such as increasing a luminance level of the HDR image or compressing bits, is prohibited on the source device. A maximum luminance value that is available with the display panel unit 211 of the synchronized device is named in a unit of cd/m2 to one (17+M)-th byte. A level of maximum luminance increase that is possible with processing by the frame signal processing circuit 208 of the synchronized device is named as a percentage unit for the (18 + M)-th byte. If "Raw" in a seventh bit of the (15+M)-th byte is False, these are used as pieces of information on the synchronized device necessary for processing, such as increasing the luminance of the HDR image or compressing bit, which is executed on the source device.

[00153] A method of storing HDR transmission information using a VSDB region is proposed here, but storage of HDR transmission information is not limited to this method, because storage is also realizable in data regions other than this. with the E-EDID data structure, for example, such as with a Video Capability Data Block (VCDB).

[00154] In the AV system 10 illustrated in Figure 1, the CPU 104 of the disc player (source device) 11 checks the connection to the television receiver (synchronized device) 12 with the HPD line (refer to Figure 2). . Thereafter, using the DDC 23 (refer to Figure 2), the CPU 104 of the disc player 11 reads the E-EDID and therefore the HDR image information from the television receiver 12 and recognizes a transmission method for an HDR image that the television receiver 12 supports.

[00155] In the AV system 10 illustrated in Figure 1, when HDR image data is transmitted to the television receiver 12, the disc player 11, as described above, selects any transmission method and any gamma correction method. among the transmission methods and the gamma correction methods for the HDR image data that the television receiver 12 can support, respectively, based on the HDR image information that is read from the television receiver 12, and thus selects the transmission method and gamma correction method and transmits the HDR image data. At this time, the disc player 11 transmits information regarding the HDR image format that is currently transmitted, to the television receiver 12.

[00156] In this case, the disc player 11 transmits the information to the television receiver 12 by inserting the information during the erasure period of the HDR image data (frame signal) which is transmitted to the television receiver 12. At this time, disc player 11, for example, inserts information relating to the image format that is currently transmitted, in the erase period of HDR image data using an HDMI Vendor Specific InfoFrame (hereinafter referred to as "VSIF") package It's similar. The VSIF package is arranged in the data island period 19 (refer to Figure 3) described above.

[VSIF Package Data Structure Example]

[00157] Figure 15 illustrates an example of the VSIF packet data structure. With HDMI, supplementary image-related information can be transmitted from the source device to the synchronized device using the VSIF packet. A checksum of the data is defined in a 0th byte. Information indicating a number "0x000C03" that is registered to HDMI(R), which is expressed as "24-bit IEEE Register Identifier (0x000C03) LSB first" is arranged in first to third bytes.

[00158] A flag indicating whether or not 3D data is present in fifth to (7 + N)-th bytes subsequent to a fourth byte is assigned to a seventh bit of a fourth byte. A "HDR_Format" flag indicating whether or not transmission information about the HDR image data is present in (8 + N)-th and later bytes is assigned to a successive sixth bit. If the "HDR_Format" flag is False, this indicates that there is no transmission of HDR image data. If the "HDR_Format" flag is True, supplementary information regarding the HDR image is named in the (8 + N)-th to (11 + M + N)-th bytes.

[00159] Information about whether or not processing, such as luminance boosting or luminance compression, is performed on the HDR image to be transmitted on the source device is assigned to a seventh bit of one (8 + N)- th byte. If "Gross" is true, this indicates that processing, such as luminance boosting, is not performed on the source device. If "Gross" is False, this indicates that processing, such as luminance boosting, is performed on the source device.

[00160] Information about which of the three methods (transmission methods (1) to (3)) (frame formats) of transmitting the HDR image is selected is named the sixth to fourth successive bits. In this case, for the sixth to fourth bits, the transmission method (1) is fixed to 0b001, the transmission method (2) to 0b010, and the transmission method (3) to 0b011. If methods other than this are proposed, 0b100 to 0b111 of the sixth to fourth bits, and third to 0th bits are available for naming.

[00161] Information about which of three gamma correction methods (gamma correction methods (1) to (3) described above) for the HDR image is selected is named the seventh to fourth bits of one (9 + N) -th byte. In this case, for the seventh to fourth bits, the gamma correction method (1) is fixed to 0b0001, the gamma correction method (2) to 0b0010, and the gamma correction method (3) to 0b0011. If methods other than this are proposed, 0b0100 to 0b1111 of the seventh to fifth bits, and fourth to 0th bits are available for naming. A byte length (M) of the data in the gamma correction method, which is named (11 + N)-th bytes and later, is named a (10 + N)-th byte.

[00162] Figure 16 illustrates a gamma correction data structure for the gamma correction method (1) (refer to Figure 10). A data length of 9 for the gamma correction method (1) is assigned to a (10 + N)-th byte. The luminance level of the display panel 211 that is assumed at the time of 100% luminance, "Reference_Screen_Luminance_White" is named in a unit of cd/m2 to (11 + N)-th to (12 + N)-th bytes. The maximum luminance level of the HDR image to be transmitted, "Extended_Range_White_Level" is named as a unit of a percentage of the (13 + N)-th to (14 + N)-th bytes.

[00163] A bit value of the image data indicating a luminance level of 0%, "Nominal_Black_Level_Code_Value" is named the (15 + N)-th byte. Typically, because values from 0 to 64 are named, the length is one byte. A bit value of the image data indicating the 100% luminance level, "Nominal_White_Level_Code_Value", is named the (16 + N)-th to (17 + N)-th bytes. A bit value of image data indicating the maximum white level that is expressed in the HDR image, "Extended_White_Level_Code_Value" is named the (18 + N)-th to (19 + N)-th bytes.

[00164] Figure 10 described above illustrates an example of the HDR information (1) that is transmitted with the VSIF package, that is, the values of "Extended_Range_White_Level", "Nominal_Black_Level_Code_Value", "Nominal_White_Level_Code_Value", and "Extended_White_Level_Code_Value" which are described above. In this example, "Extended_Range_White_Level" is "400", and the bit length is 10 bits.

[00165] Figure 17 illustrates a gamma correction data structure for the gamma correction method (2). A data length of 13 for the range(2) method is assigned to the (10+N)-th byte. An input luminance level for method (2), "Input_Knee_Point", is named in units of 0.1% to (11 + N)-th to (12 + N)-th bytes. An output luminance level, "Output_Knee_Point", is named in units of 0.1% to (13 + N)-th to (14 + N)-th bytes.

[00166] A dynamic range of the HDR image to be transmitted, "Dynamic_Range", is named in units of 0.1% to (15 + N)-th to (18 + N)-th bytes. A luminance level at maximum dynamic range, "Dynamic_Range_Luminance" is named in a unit of cd/m2 to (19 + N)-th to (22 + N)-th bytes.

[00167] Figure 11 described above illustrates an example of the HDR information (2) that is transmitted with the VSIF package, that is, the values of the "Input_Knee_Point", the "Output_Knee_Point", "Dynamic_Range", and the "Dynamic_Range_Luminance" which are described above. The data structure for a set of "Knee_Points" is illustrated here, but a more accurate curve can be approximated using data with multiple "Knee_Points".

[00168] Figure 18 illustrates a gamma correction data structure for the gamma method (3). A data length of 4 for the gamma correction method (3) is assigned to the (10 + N)-th byte. The luminance level at the time of 100% luminance, "Screen_Luminance_White_Level" is named in a unit of cd/m2 to (11 + N)-th to (12 + N)-th bytes. The luminance level at the time of 0% luminance, "Screen_Luminance_Black_Level" is named in a unit of cd/m2 to one (13 + N)-th byte. Typically, because values from 0 to 64 are named, the length is one byte. A gamma value, "Gamat_Value" is named the one (14 + N)-th byte.

[00169] Figure 12 described above illustrates an example of a calculation formula using the HDR information (3) that is transmitted with the VSIF package, that is, the "Screen_Luminance_White_Level", the "Screen_Luminance_Black_Level" and the "Gamat_Value" that are described above.

[00170] If any one of the sixth to fourth bits of an (8 + N)-th byte is set to True, the synchronized device (the television receiver 12 according to the embodiment) can determine that the HDR image data are transmitted. Additionally, the synchronized device can determine the transmission method (frame format) depending on which of the sixth to fourth bits is set to Truth.

[00171] That is, if the sixth to fourth bits are set to 0b001, it is understood that the frame format called 1920 x 1080p deep color is used, and thus the transmission of HDR image data is performed (refer to to Figure 7). Furthermore, if the sixth to fourth bits are set to 0b010, the stereoscopic frame format called 1920 x 1080p frame packing is used, and thus HDR image data transmission is performed (refer to Figure 8) . Furthermore, it is understood that if the sixth to fourth bits are set to 0b011, the 1920 x 1080p frame format for high frame rate is used, and thus transmission of HDR image data is performed (refer to to Figure 9).

[00172] Furthermore, with seventh to fourth bit values of (9 + N)-th byte, the gamma correction method for the HDR image can be determined. That is to say, it is understood that if seventh to fourth bits are set to 0b0001, the gamma correction method (1) is used, and thus the transmission of HDR image data is performed (refer to Figure 10). Furthermore, it is understood that if the seventh to fourth bits are set to 0b0010, the gamma correction method (2) is used, and thus transmission of the HDR image data is performed (refer to Figure 11). Furthermore, it is understood that if the seventh to fourth bits are set to 0b0011, the gamma correction method (3) is used, and thus transmission of the HDR image data is performed (refer to Figure 12).

[00173] A method for transmitting HDR transmission information using VSIF packet is proposed here, but transmission of HDR transmission information is not limited to this method, because transmission is also achievable with data packets other than this , for example, such as with an Auxiliary Video (AV) InfoFrame. However, if HDR-related information from television receiver 12 (synchronized device) is transmitted to disc player (source device) 11 using the VSDB region of an E-EDID data region, it is desirable that the HDR-related information HDR from disc player 11 is transmitted with the VSIF packet.

[Example of Processing by the Source Device When Connecting to a Device]

[00174] Next, processing by the disc player (source device) 11 at the time of connection to the television receiver (synchronized device) 12 in the AV system 10 illustrated in Figure 1 is described by referring to a flowchart in Figure 19.

[00175] Disc player 11 begins processing in Step ST1, and thereafter proceeds to processing in Step ST2. In Step ST2, the disc player 11 determines whether or not an HPD signal is at a high "H" level. When the HPD signal is not at the high "H" level, the television receiver (synchronized device) 12 is not connected to the disc player 11. At this time, the disc player 11 proceeds to Step ST8, and processing ends.

[00176] If the HPD signal is at high level "H", the disc player 11 reads the E-EDID of the television receiver 12 in Step ST3. Then, in Step ST4, the disc player 11 determines whether or not HDR image information (HRD data) is present. When the HDR image information is not present, the disc player 11 sets data indicating no transmission of the HDR image to be in the VSIF packet at Step ST7 and thereafter proceeds to Step ST8, and processing ends. At this time, the placement of the data indicating the non-transmission of the HDR image means that a sixth bit of a fourth byte in the VSIF packet (refer to Figure 15) is set to a low level "L".

[00177] Furthermore, when HDR image information is present in Step ST4, the disc player 11 determines the transmission method and gamma correction method for the HDR image data in Step ST5. Then, the disc player 11 sets data indicating the transmission method and the gamma correction method for the HDR image data to be in the VSIF packet in Step ST6, and thereafter proceeds to Step ST8, and the processing ends.

[Example of HDR Transmission Method Selection Processing on Source Device]

[00178] Next, determination processing (processing in Step ST5 in Figure 19) by the disc player (source device) 11 of the transmission method for the HDR image data in the AV system 10 illustrated in Figure 1 is described referring to flowcharts in Figures 20 and 21.

[00179] Disc player 11 begins processing at Step ST11, and thereafter proceeds to Step ST12. In Step ST12, the disc player 11 determines whether or not a fourth bit of an eighth byte in the VSDB region in the television receiver (synchronized device) 12 is high "H". When the fourth bit of the eighth byte is not at the high level "H", the disc player 11 sets the data indicating the non-transmission of the HDR image to be in the VSIF packet in Step ST13 and thereafter proceeds to Step ST27, and the processing ends. At this time, the placement of the data indicating the non-transmission of the HDR image means that the sixth bit of the fourth byte in the VSIF packet (refer to Figure 12) is set to "L".

[00180] When in Step ST12, the fourth bit of the eighth byte is at high level "H", the disc player 11 proceeds to processing in Step ST14. In Step ST14, the disc player 11 determines whether or not a seventh bit of a (15 + M)-th byte in the VSDB region in the television receiver 12 is high "H". When the seventh bit of the (15 + M)-th byte is not at the high level "H", the disc player 11 reads a (17 + M)-th byte and a (18 + M)-th byte in the region of VSDB in Step ST15 and proceeds to the next Step ST16.

[00181] In Step ST16, the disc player 11 performs luminance compression processing of the HDR image to be transmitted, based on the maximum luminance data (cd/m2) of the display panel 211, stored in (17 + M) -th byte that is read, and the data about the maximum luminance increase level (%) stored in the (18 + M)-th byte, and proceeds to the next Step ST17. In Step ST17, the disc player 11 sets data indicating the execution of luminance compression processing on the HDR image and information about gamma correction to be in the VSIF packet and thereafter proceeds to Step ST27, and the processing ends. At this time, the placement of the data indicating the performance of luminance compression on the HDR image means that a seventh bit of an (8 + N)-th byte in the VSIF packet (refer to Figure 15) is set to "False = L".

[00182] Furthermore, when in Step ST14, the seventh bit of the (15 + M)-th byte is at high level "H", the disc player 11 proceeds to the next Step 19 without performing luminance compression processing on the HDR image in Step ST18. In Step ST19, the disk player 11 determines whether or not a sixth bit of the (15 + M)-th byte in the VSDB region is set high "H".

[00183] When the sixth bit of the (15 + M)-th byte is at the high level "H", the disc player 11 selects method (1) among the HDR image transmission methods in Step ST20, and proceeds to the next Stage ST21. Disc player 11 sets data indicating the transmission method (1) for the HDR image to be in the VSIF packet in Step ST21, and thereafter proceeds to Step ST26-1. At this time, the placement of the data indicating the transmission method (1) for the HDR image means that sixth to fourth bits of an (8 + N)-th byte in the VSIF packet (refer to Figure 15) are fixed to "0b001".

[00184] Furthermore, when in Step ST19, the sixth bit of the (15 + M)-th byte is at the low level "L", proceeding to the next Step ST22 takes place. In Step ST22, the disk player 11 determines whether or not a fifth bit of the (15 + M)-th byte in the VSDB region is set high "H". When the fifth bit of the (15 + M)-th byte is at the high level "H", the disc player 11 selects method (2) among the HDR image transmission methods in Step ST23, and proceeds to the next Step ST24.

[00185] In Step ST24, the disc player 11 sets data indicating the transmission method (2) for the HDR image to be in the VSIF packet, and thereafter proceeds to Step ST26-1. At this time, the placement of data indicating transmission method (2) for the HDR image means that the sixth to fourth bits of the (8 + N)-th byte in the VSIF packet (refer to Figure 15) are fixed to "0b010".

[00186] Furthermore, when the fifth bit of the (15 + M)-th byte is not at the high level "H" in Step ST22, the disc player 11 selects method (3) among the image transmission methods of HDR in Step ST25, and proceeds to the next Step 26. In Step ST26, the disc player 11 sets data indicating the transmission method (3) for the HDR image to be in the VSIF packet, and thereafter proceeds to Step ST26- 1. At this time, the placement of data indicating transmission method (3) for the HDR image means that the sixth to fourth bits of the (8 + N)-th byte in the VSIF packet (refer to Figure 15) are fixed to "0b011".

[00187] In Step ST26-1, the disk player 11 determines whether or not a sixth bit of a (16 + M)-th byte in a VSDB packet is at high level "H". When the sixth bit of the (16 + M)-th byte is at the high level "H", in Step ST26-2, the disc player 11 sets the seventh to fourth bits of a (9 + N)-th byte in the region of VSIF to "0b0010", sets data in the range correction method (2) to be in (10 + N)-th to (22 + N)-th bytes, and proceeds to Step ST27, and processing ends.

[00188] Furthermore, when in Step ST26-1, the sixth bit of the (16 + M)-th byte in the VSDB packet is not at the high level "H", the disc player 11 proceeds to Step ST26-3. In Step ST26-3, the disk player 11 determines whether or not a seventh bit of the (16 + M)-th byte in the VSDB packet is high "H". When the seventh bit of the (16 + M)-th byte is at the high level "H", in Step ST 26-4, the disc player 11 sets the seventh to fourth bits of the (9 + N)-th byte in the region from VSIF to "0b0001", fixes data in the range correction method (1) to be in (10 + N)-th to (19 + N)-th bytes, and proceeds to Step ST27, and processing ends.

[00189] Furthermore, when in Step ST26-3, the seventh bit of the (16 + M)-th byte is not at the high level "H", the disc player 11 proceeds to Step ST26-5. In Step ST26-5, disk player 11 determines whether or not a fifth bit of the (16 + M)-th byte in the VSDB packet is high "H". When the fifth bit of the (16 + M)-th byte is at the high level "H", in Step ST 26-6, the disc player 11 sets the seventh to fourth bits of the (9 + N)-th byte in the region from VSIF to "0b0011", fixes data in the range correction method (3) to be in (10 + N)-th to (14 + N)-th bytes, and proceeds to Step ST27, and processing ends.

[00190] Furthermore, when in Step ST26-5, the fifth bit of the (16 + M)-th byte in the VSDB packet is not at the high level "H", the disc player 11 proceeds to Step ST26-7. In Step ST 26-7, seventh to fourth bits of a (9 + N)-th byte in the VSIF region are set to "0b0000", and a (10 + N)-th byte is set to "L", proceed Step ST27 occurs, and processing ends.

[Example of Processing by the Synchronized Device When Setting a Power Saving Mode]

[00191] Next, processing by the television receiver (synchronized device) 12 when setting a power saving mode in the AV system 10 illustrated in Figure 1 is described by referring to a flowchart in Figure 22. The television receiver 12 begins processing at Step ST30, and thereafter proceeds to Step ST31. In Step ST31, the television receiver 12 determines whether or not its own operating mode is set to a power saving mode.

[00192] When switching to power saving mode is performed, from the perspective of power saving, it is not desirable for the television receiver 12 to perform HDR luminance increase more than is necessary, because the user selects an operation which suppresses power consumption by lowering the luminance of the display panel 211 and thereby displaying an image. For this reason, when switching to power saving mode is performed, the television receiver 12 proceeds to processing in Step ST32.

[00193] In Step ST32, the television receiver 12 sets a seventh bit of a (15 + M)-th byte that is present in the VSDB region of its own E-EDID to "False = L". Furthermore, in Step ST32, the television receiver 12 sets additional values of the maximum luminance level of the display panel 211, stored in a (17 + M)-th byte, and of a maximum luminance range, stored in a ( 18 + M)-th byte, for values of luminance levels and a maximum luminance range that are fixed in power saving mode, respectively. Thereafter, the television receiver 12 proceeds to Step ST34, and processing ends.

[00194] Furthermore, when switching to power saving mode is not performed in Step ST31, the television receiver 12 proceeds to Step ST33. In Step ST33, the television receiver 12 sets the seventh bit of the (15 + M)-th byte that is present in the VSDB region of its own E-EDID "Truth = H". Furthermore, in Step ST33, the television receiver 12 additionally sets the values of the maximum luminance level of the display panel 211, stored in the (17 + M)-th byte, and the maximum luminance range, stored in the (18 + M)-th byte, for values of its own maximum luminance level and maximum luminance range, respectively. Thereafter, the television receiver 12 proceeds to Step ST34, and processing ends.

[Example in which Processing by the Synchronized Device Cancels Power Save Mode]

[00195] Next, processing that the television receiver (synchronized device) 12 performs when the HDR image begins to be transmitted from the disc player (source device) 11 at the time of setting the energy saving mode on the AV 10 illustrated in Figure 1 is described by referring to a flowchart in Figure 23.

[00196] The television receiver 12 begins processing at Step ST40, and thereafter proceeds to Step ST41. In Step ST41, the television receiver 12 determines whether or not a sixth bit of a fourth byte in the VSIF packet (refer to Figure 15) that is transmitted from the disc player 11 is set high "H". If the sixth bit of the fourth byte is not set to high "H", it is determined that there is no transmission of the HDR image, proceeding to Step ST47 then occurs without canceling the power saving mode and processing ends.

[00197] If the sixth bit of the fourth byte is set high "H" in Step ST41, the television receiver 12 proceeds to Step ST42. In Step ST42, television receiver 12 determines whether or not television receiver 12 is set to power saving mode. If switching to power save mode is not performed, the television receiver 12 determines that reception of the HDR image is possible, then proceeds to Step ST47 without being set to power save mode and processing ends.

[00198] If switching to power saving mode is performed in Step ST42, the television receiver 12 proceeds to the next Step ST43. In Step ST43, the television receiver 12 displays on the display panel 211 a selection screen by which the user gives an instruction as to whether or not to cancel the power saving mode and thus perform HDR image reception, thereby alerting the user to the selection screen, and when the user makes a selection, proceeds to the next Step ST44.

[00199] In Step ST44, the television receiver 12 determines whether or not the user gives an instruction to cancel the power saving mode and thus select the execution of HDR image reception. If the user does not wish to cancel the power saving mode, the power saving mode is not cancelled, proceed to Step ST47 then happens and processing ends.

[00200] If the user wishes to cancel the power saving mode in Step ST44, the television receiver 12 proceeds to the next Step ST45. In Step ST45, in order to cancel the power saving mode and thus perform HDR image reception, the television receiver 12 sets a seventh bit of a (15+M)-th byte in the VSDB region (refer to to Figure 14) at high level "H", sets a maximum value of the luminance level to a luminance value at which one (17 + M)-th byte and one (18 + M)-th byte can be displayed on its display panel 211 itself, and proceeds to the next Step ST46. In Step ST46, the television receiver 12 cancels the power saving mode, and thereafter proceeds to Step ST47, and processing ends.

[00201] As described above, in the AV system 10 illustrated in Figure 1, HDR image data is transmitted from the disc player 11 to the television receiver 12 via the HDMI cable 13, information about the transmission method and gamma correction information for the HDR image data are transmitted via the same HDMI cable 13, and thus the transmission of the HDR image data can be performed satisfactorily. For example, based on the transmission method information and the gamma correction information that are received, the television receiver 12 can appropriately process the received HDR image data.

[00202] Furthermore, in the AV system 10 illustrated in Figure 1, methods such as the transmission method for and the gamma correction method for the HDR image data that the television receiver 12 can support can be selected on the disc player 11. For this reason, on the television receiver 12, it can be ensured that decoding processing and gamma correction processing are performed on the received HDR image data. In other words, the transmission of HDR image data can be performed satisfactorily between the disc player 11 and the television receiver 12.

2. Modification Example

[00203] Furthermore, according to the embodiment described above, the disc player 11 inputs the transmission method information and the gamma correction information for the HDR image data during the erasure period of the HDR image data. image (frame signal) using the VSIF packet, and thus these pieces of information are transmitted to the television receiver 12.

[00204] For example, the disc player 11 may transmit the transmission method information and the gamma correction information for the HDR image data to the television receiver 12 via the CEC line 24, which is a control data line of the HDMI cable 13. Additionally, for example, the disc player 11 may transmit transmission method information and gamma correction information for HDR image data to the receiver. cable 12 through the bidirectional communication path that is configured from the backup line 27 and the HPD line 25 of the HDMI cable 13.

[00205] Furthermore, according to the embodiment described above, pieces of information about the transmission method and the gamma correction method for the HDR image data that the television receiver 12 supports are included in the E-EDID of the television receiver 12, and the disc player 11 reads the E-EDID through the DDC 23 of the HDMI cable 13 and thus obtains the pieces of information about the transmission method and the gamma correction method for the image data of HDR that the television receiver 12 supports.

[00206] However, the disc player 11 can receive the pieces of information about the transmission method and the gamma correction method for the HDR image data that the television receiver 12 supports, from the television receiver 12 through the CEC line 24, which is the control data line of the HDMI cable 13, or through the bidirectional communication path that is configured from the backup line 27 and the HPD line 25 of the HDMI cable 13.

[00207] Furthermore, in accordance with the embodiment described above, the example is illustrated in which the disc player 11 transmits both the transmission method information and the gamma correction information for the HDR image data to the television receiver 12. However, a configuration is also considered in which either of these two pieces of information is transmitted.

[00208] Furthermore, according to the embodiment described above, it is illustrated that an HDMI transmission path is used. However, in addition to HDMI, as baseband digital interfaces, there are a Mobile High Definition Link (MHL), a Digital Visual Interface (DVI), a Display Port (DP) interface, a wireless interface using millimeter wave 60 GHz and similar. The present technology can be applied in the same way to a case where HDR image data is transmitted with these digital interfaces.

[Example of a DP System Structure]

[00209] Figure 24 illustrates an example configuration of a DP system 300 that uses a DP interface. In the DP system 300, a DP transmitter 301 and a DP receiver 307 are connected to each other with a DP cable 303. Furthermore, the DP transmitter 301 includes a DP transmission unit 302, and the DP receiver DP 307 includes a DP receiving unit 308 and a storage unit 309.

[00210] The DP cable 303 is configured with a main connection 304, an AUX channel 305, and a hot plug detection 306. The main connection 304 is configured with one, two, or four pairs of duplex terminal differential signals ( pair lines), does not have a dedicated clock signal, and a clock is instead embedded in an 8B/10B encoded data stream.

[00211] Unlike HDMI, in the DP interface, a baud rate and a pixel frequency are independent of each other, and a pixel depth or resolution, a frame frequency, and the presence or absence of voice data or additional data such as DRM information within a transmission stream and an amount of the voice data or additional data can be freely adjusted. Transmission of the HDR image data, transmission method information, and gamma correction information for the HDR image data is performed using the main link 304.

[00212] For a DP interface transmission data structure, the TMDS transmission data structure (refer to Figure 3) on HDMI is used, and for HDR image data, the image data structure on HDMI in Figures 7 to 9 is used. Furthermore, the transmission method information and the gamma correction information for the HDR image data use the package whose data structure is the same as that of the VSIF package (refer to Figure 15), which is inserted during control period 19 (refer to Figure 3) into the HDMI and thus transmitted.

[00213] The DP transmitter 301 checks for a connection to the DP receiver 307 with a hot plug detection 306. Thereafter, using the AUX channel 305, the DP transmitter 301 reads the HDR image information in the E-EDID of the storage unit 309 of the DP receiver 307 and recognizes the transmission method for the HDR image that the DP receiver 307 supports. The data structure of the HDR image information in E-EDID in the DP receiver 307 may be the same as in Figures 13 and 14.

[00214] Furthermore, in addition to the main link 304, the DP interface has the half-duplex bidirectional AUX channel 305 with a bandwidth of 1 Mbit/s or a bandwidth of 720 Mbit/s, and exchanges information relating to a function between a transmitter and a receiver is performed through such bidirectional communication. Transmission of information on transmission method and information on gamma correction method for HDR image data can be performed using AUX channel 305.

[Example of an AUX Channel Data Structure]

[00215] Figure 25(a) illustrates an example of a packet structure in a case where transmission of transmission method information and gamma correction method information for HDR image data is performed with the AUX channel 305. A packet is configured with a header, a data region, and a STOP bit. The header is configured from a SYNC section for synchronization, a 4-bit command section, and a 20-bit memory address of the storage unit 309. Additionally, the data region is configured from a data length section of 8 bits and a payload section of length from 8 bits to 128 bits or 512 bits.

[00216] Information about the transmission method and information about the gamma correction method for the HDR image data are inserted into the payload. When transmission method information and gamma correction method information for HDR image data are transmitted from DP transmitter 301 to DP receiver 307, "0b1000" is fixed to be in the command section of the header. Syntax data that is expressed as "Metadata_tx", as illustrated in Figure 25(b), is fixed to be in the payload section.

[00217] "Continuation_flag" is a bit that indicates continuity when data length of the payload section of a packet is less than that of the transmission method information and the gamma correction method information for the transmission data. HDR image that has to be transmitted and so these pieces of information are divided into multiple packets and are transmitted. "Metadata_type" indicates a method that the DP receiver 307 selects, based on the pieces of information about the transmission method and the gamma correction method for HDR image data that the DP transmitter 301 supports. "Metadata" fixes the transmission method information and the gamma correction method information for the HDR image data that is transmitted.

[00218] Furthermore, when pieces of information about the transmission method and the gamma correction method for the HDR image data that the DP receiver 307 supports are obtained, the DP transmitter 301 assigns "0b1001" to header section command section. Syntax data that is expressed as "EDID read", as illustrated in Figure 25(c), is fixed to be in the payload section. A data byte length in the transmission method information and the gamma correction method information for the HDR image data that is obtained is set to be in "HDR_VSDB_length". In this way, also in the DP system 300, information about the transmission method and information about the gamma correction method for the HDR image data can be transmitted in the same way as in the AV system 10 on HDMI.

[Example of an MHL System Structure]

[00219] Figure 26 illustrates an example configuration of an MHL system 400 that uses an MHL interface. In the MHL system, an MHL transmitter 401 and an MHL receiver 408 are connected to each other with an MHL cable 404. Additionally, the MHL transmitter 401 includes a TMDS transmission unit 402 and a storage unit 403 , and the MHL receiver 408 includes a TMDS receiving unit 409, a storage unit 410 and an EDID-ROM 411.

[00220] The MHL cable 404 is configured from a TMDS channel 405, an MHL Link Control Bus (CBUS)/enhanced MHL Link Control Bus (eCBUS) line 406, and a Power source MHL voltage (VBUS) 407. The TMDS channel 405 is configured from a pair of differential signal pairs, and the transmission of the HDR image data, the transmission method information and the transmission information gamma information for the HDR image data is performed.

[00221] For an MHL interface transmission data structure, the TMDS transmission data structure (refer to Figure 3) on HDMI is used, and for HDR image data, the image data structure on HDMI in Figures 7 to 9 is used. Furthermore, the transmission method information and the gamma correction information for the HDR image data use the package whose data structure is the same as that of the VSIF package (refer to Figure 15), which is inserted during control period 19 (refer to Figure 3) into the HDMI and thus transmitted.

[00222] In line with CBUS/eCBUS 406, when a data section of packet data in Figure 27 is set to 0x64, HPD indicates high level "1", and when the data section of packet data is set to 0x65, HPD indicates low level "0". Thus, the MHL transmitter 401 checks for a connection to the MHL receiver 408 via the CBUS/eCBUS line 406.

[00223] Thereafter, using the CBUS/eCBUS line 406, the MHL transmitter 401 reads the HDR image information in the E-EDID of the MHL receiver 408 and recognizes the transmission method for the HDR image that the receiver of MHL 408 supports. The data structure of the HDR image information in E-EDID in the MHL receiver 408 may be the same as in Figures 13 and 14.

[Example of a CBUS Line Data Structure]

[00224] Figure 28(a) illustrates a CBUS packet format in a case where transmission of information on the transmission method and gamma correction information for HDR image data via the CBUS/eCBUS line 406 is executed. Typically, because the packet that is transmitted over the CBUS/eCBUS line 406 is transmitted by multiplexing in a time division manner the data that is one byte in data length, a delay occurs when the data that is large in data length are transmitted such as transmission method information and gamma correction information for HDR image data, and the CBUS/eCBUS line 406 is unsuitable for data transmission that requires real-time transmission. Then, an augmented MHL specific communication (eMSC) "Block Protocol" is used that can block transmit data of up to 256 bytes. Such a packet is configured from a 2-byte request command section (0xFF), a NULL waiting response section, a START unit, a 256-byte payload section, a 2-byte CRC section, and a response section expecting NULL.

[00225] Transmission method information and gamma correction information for the HDR image data are inserted into the 256-byte payload section. Syntax data that is expressed as "Metadata_tx", as illustrated in Figure 28(b), is fixed to be in the payload section. The "Metadata_type" indicates a method that the MHL transmitter 401 selects, based on the pieces of information about the transmission method and the gamma correction method for the HDR image data that the MHL receiver 408 supports. "Metadata" fixes the transmission method information and the gamma correction method information for the HDR image data that is transmitted. In this way, also in the MHL system 400, information about the transmission method and information about the gamma correction method for the HDR image data can be transmitted in the same way as in the AV system 10 on HDMI.

[00226] Furthermore, according to the embodiment, the example is illustrated in which the record player 11 is used as the transmitting device (source device) and the television receiver 12 is used as the receiving device (source device). synchronized) but, certainly, although other transmitting devices and receiving devices are used, the present technology can be applied in the same way.

[00227] Furthermore, the present technology can be configured as follows. (1) A transmission device including: a data transmission unit that transmits image data in a high dynamic range to an external device via a transmission path; and an information transmission unit that transmits information about a transmission method and/or gamma correction information for the high dynamic range image data that is transmitted in the data transmission unit, to the external device via the transmission path. streaming. (2) The transmission device according to (1) wherein the data transmission unit transmits the image data in the high dynamic range to the external device via the transmission path using a differential signal. (3) The transmission device according to (2) in which the information transmission unit inputs the information about the transmission method and/or the information about the gamma correction for the image data in the high dynamic range that are transmitted in the data transmission unit, during a period of erasure of image data in the high dynamic range, and thus transmits the entered information to the external device. (4) The transmission device according to (2), wherein the information transmission unit transmits the information about the transmission method and/or the information about the gamma correction for the image data in the high dynamic range that are transmitted in the data transmission unit, to the external device through a control data line that makes up the transmission path. (5) The transmission device according to (2), wherein the information transmission unit transmits the information about the transmission method and/or the information about the gamma correction for the image data in the high dynamic range that are transmitted in the data transmission unit, to the external device via a bidirectional communication path that is configured from a predetermined line of the transmission path. (6) The transmission device according to (5), wherein the bidirectional communication path is a pair of differential communication paths, and at least one of the differential communication paths in the pair has a function of receiving a status notification external device connection using direct current bias potential. (7) The transmission device according to any one of (1) to (6), wherein the image data in the high dynamic range includes first data and second data, and wherein the data transmission unit configures the first data data and the second data in a frame format stipulated for a stereoscopic image, and transmits the frame format to the external device via the transmission path. (8) The transmission device according to any one of (1) to (6), wherein the image data in the high dynamic range includes first data and second data, and wherein the data transmission unit transmits the first data data, as a first frame image, to the external device via the transmission path and transmits the second data, as a second frame image, to the external device via the transmission path. (9) The transmission device according to any one of (1) to (6), wherein the image data in the high dynamic range includes first data and second data, and wherein the first data is 8-bit data. low order of the image data in the high dynamic range and the second data is high order bit data of the image data in the high dynamic range, or the first data is high order 8 bit data of the image data in the high dynamic range and the second data is low-order bit data of the image data in the high dynamic range. (10) The transmission device according to any one of (1) to (9), wherein information about the transmission method and information about gamma correction for image data in the high dynamic range that is transmitted in the data transmission unit include at least one, among information at a maximum white level exceeding 100%, of the image data in the high dynamic range, a bit value at the time of expression at a black level, a bit value at the time of expression at a 100% white level, a flag indicating whether or not processing for the high dynamic range is performed, a luminance level of a receiving device that is assumed at the time of the 100% white level, a luminance input level that is necessary for a luminance increase in an image in the high dynamic range, and a luminance output level that is necessary for the luminance increase in the image in the high dynamic range. (11) The transmission device according to any one of (1) to (10), further including: an information receiving unit that receives the pieces of information about the transmission method and/or the gamma correction method for image data in the high dynamic range that the external device can support, which is transmitted from the external device via the transmission path; and a method selection unit which, based on transmission method information and/or gamma correction method information that is received at the information receiving unit, selects a predetermined transmission method and/or a method of predetermined gamma correction from among the transmission methods and/or gamma correction methods for the image data in the high dynamic range that the external device can support, wherein the data transmission unit transmits the image data in the high dynamic range high according to the transmission method and/or the gamma correction method that are selected in the method selection unit, to the external device via the transmission path. (12) A method for transmitting image data in a high dynamic range, including: a data transmission step of transmitting the image data in the high dynamic range to an external device via a transmission path, and a transmission step of information of transmitting information about a transmission method and/or information about gamma correction for the image data in the high dynamic range that is transmitted in the data transmission step, to the external device via the transmission path. (13) A program for making a computer function as: a data transmission medium that transmits image data in a high dynamic range to an external device via a transmission path; and information transmission means that transmits information about a transmission method and/or gamma correction information for image data in the high dynamic range that is transmitted on the data transmission medium, to the external device via the transmission path . (14) A receiving device including: a data receiving unit that receives high dynamic range image data to display a high dynamic range image from an external device via a transmission path; an information receiving unit that receives information about a transmission method and/or gamma correction information for image data in the high dynamic range that is received at the data receiving unit from the external device; and a data processing unit which, based on transmission method information and/or gamma correction information that is received at the information receiving unit, processes image data in the high dynamic range that is received at the data receiving unit. (15) The receiving device according to (14), wherein the data receiving unit receives the high dynamic range image data from the external device via the transmission path using a differential signal. (16) The receiving device according to (15), wherein the information receiving unit extracts the information about the transmission method for and/or the information about the gamma correction for the image data in the high dynamic range of a blanking period for image data in the high dynamic range that is received at the data receiving unit. (17) The receiving device according to (15) wherein the information receiving unit receives the information about the transmission method and/or the information about the gamma correction for the image data in the high dynamic range which is received at the data reception unit, from the external device through a control data line that makes up the transmission path. (18) The receiving device according to (15), wherein the information receiving unit receives the information about the transmission method and/or the information about the gamma correction for the image data in the high dynamic range that is received at the data receiving unit from the external device via a bidirectional communication path that is configured from a predetermined line of the transmission path. (19) The receiving device according to (18), wherein the bidirectional communication path is a pair of differential communication paths, and at least one of the differential communication paths in the pair has a function of notifying the external device of a connected state using direct current bias potential. (20) The receiving device according to any one of (14) to (19), wherein the image data in the high dynamic range includes first data and second data, and wherein the data transmitting and receiving unit receives the first data and the second data, which are configured in a stipulated frame format for a stereoscopic image, from the external device through the transmission path. (21) The receiving device according to any one of (14) to (19), wherein the image data in the high dynamic range includes first data and second data, and wherein the data transmitting and receiving unit receives the first frame image that is configured from the first data and the second frame image that is configured from the second data, from the external device via the transmission path. (22) The receiving device according to any one of (14) to (19), wherein the image data in the high dynamic range includes first data and second data, and wherein the first data is 8-bit data. low order image data in the high dynamic range and the second data is high order bit data of the image in the high dynamic range, or the first data is high order 8 bit data of the image data in the high dynamic range and the second data is low-order bit data of image data in the high dynamic range. (23) The receiving device according to any one (14) to (22), further including: a display control unit that performs a display of whether or not to cancel a power saving mode, on a display unit , when information about the transmission method for image data in the high dynamic range that is transmitted from the external device is received at the information receiving unit, if the power saving mode is selected. (24) The receiving device according to any one of (14) to (23), further including: an information storage unit in which pieces of information about the transmission method and/or the gamma correction method for image data in the high dynamic range that the information storage unit itself can support is stored; and an information transmission unit that transmits the transmission method information and/or the gamma correction method information that is stored in the information storage unit, to the external device via the transmission path. (25) The receiving device according to (24), wherein at least one, among information about maximum luminance at which a display is possible, information about a maximum increase luminance level at which processing for the high dynamic range is possible, and a flag to prohibit augmentation processing, is additionally stored in the information storage unit. (26) The receiving device according to (24) or (25), additionally including: a storage control unit that rewrites a signal to prohibit augmentation processing, as invalid, which is stored in the information storage unit, if the flag to prohibit augmentation processing is stored in the information storage unit and a power saving mode is selected. (27) The receiving device according to any one of (24) to (26), further including: a storage control unit that rewrites information about maximum luminance at which display is possible and information about a luminance level of maximum magnification at which processing for the high dynamic range is possible, which are stored in the information storage unit, if information about the maximum luminance at which display is possible and information about the maximum magnification luminance level at which the processing for high dynamic range is possible are stored in the information storage unit and a power saving mode is selected. (28) A method for receiving image data in a high dynamic range, including: a data receiving step of enabling a data receiving unit to receive the image data in the high dynamic range from an external device via a transmission path. streaming; an information receiving step of receiving information about a transmission method and/or gamma correction information for image data in the high dynamic range that is received in the data receiving step from the external device and an information processing step data processing image data in the high dynamic range that is received in the data reception step, based on information about the transmission method and/or information about gamma correction that is received in the information reception step. (29) A program for making a computer function as: a data receiving medium that receives high dynamic range image data to display a high dynamic range image from an external device via a transmission path; information receiving means that receives information about a transmission method and/or gamma correction information for image data in the high dynamic range that is received at the data receiving unit from the external device; and a data processing means that processes image data in the high dynamic range that is received on the data receiving medium, based on transmission method information and/or gamma correction information that is received on the medium of receiving information. List of Reference Signals 10 AV SYSTEM 11 DISC PLAYER 11a HDMI TERMINAL 11b HDMI TRANSMISSION UNIT 11c HIGH SPEED BUS INTERFACE 12 TELEVISION RECEIVER 12a HDMI TERMINAL 12b HDMI RECEIVING UNIT 12c HIGH SPEED BUS INTERFACE SPEED 13 HDMI CABLE 14 EFFECTIVE PICTURE PERIOD 15 HORIZONTAL CLEARING PERIOD 16 VERTICAL CLEARING PERIOD 17 VIDEO DATA PERIOD 18 DATA ISLAND PERIOD 19 CONTROL PERIOD 21 HDMI TRANSMITTER 22 HDMI RECEIVER 23 DDC LINE 2 4 LINE CEC 25 HPD LINE 26 POWER SUPPLY LINE 27 RESERVE LINE 104 CPU INTERNAL BUS ROM FLASH SDRAM REMOTE CONTROL RECEIVING UNIT REMOTE CONTROL TRANSMISSION UNIT SATA INTERFACE BD DRIVE ETHERNET INTERFACE NETWORK TERMINAL PROCESSING CIRCUIT DECO DIFFIFIER OF MPEG FRAME SIGNAL PROCESSING CIRCUIT GRAPHICS GENERATION CIRCUIT PANEL EXCITATION CIRCUIT DISPLAY PANEL VOICE SIGNAL PROCESSING CIRCUIT VOICE AMPLIFIATION CIRCUIT SPEAKER INTERNAL BUS CPU ROM FLASH DRAM ETHERNET INTERFACE NETWORK TERMINAL UNIT REMOTE CONTROL RECEIVING REMOTE CONTROL TRANSMISSION UNIT DISPLAY CONTROL UNIT POWER SUPPLY UNIT DP SYSTEM DP TRANSMITTER DP TRANSMISSION UNIT DP CABLE MAIN CONNECTION AUX CHANNEL HOT PLUG DETECTION DP RECEIVER DP RECEIVING UNIT STORAGE UNIT MHL SYSTEM MHL TRANSMITTER TMDS TRANSMISSION UNIT STORAGE UNIT MHL CABLE TMDS CHANNEL CBUS/eCBUS LINE VBUS LINE MHL RECEIVER 409 TMDS RECEIVING UNIT 410 STORAGE UNIT 411 EDID ROM

Claims (20)

1. Transmission device (11) comprising: an information receiving unit that receives information about a gamma correction method for high dynamic range, HDR, image data, which an external device (12) is capable of supporting, at information being received from the external device via a transmission path (13), a method selection unit which, based on gamma correction method information received at the information receiving unit, selects a gamma correction method from a plurality of gamma correction methods for HDR image data, the selected gamma correction method being supported by the external device, a data transmission unit (11b) that transmits the HDR image data to a external device (12) through the transmission path (13) using a differential signal in accordance with the selected gamma correction method; and an information transmission unit that transmits gamma correction information for the HDR image data via the transmission path (13), wherein the gamma correction information for the HDR image data includes correction data of gamma correction according to the selected gamma correction method and an indication of the selected gamma correction method, the transmission device (11) characterized in that information about gamma correction for the HDR image data includes additionally: a flag indicating whether or not processing comprising luminance compression for the HDR image data is performed in the transmission device (11), and an indication of an amount of the gamma correction data. 2. Transmission device (11) according to claim 1, characterized by the fact that the HDR image data includes first data and second data, and wherein the first data is low-order 8-bit data of the image data of HDR and the second data is high-order bit data of the HDR image data, or the first data is high-order 8-bit data of the HDR image data and the second data is low-order bit data of the HDR image data. HDR image data. 3. A method for transmitting image data in a high dynamic range, HDR, by a transmission device comprising: an information reception step of receiving information about a gamma correction method for HDR image data than an external device ( 12) is capable of supporting, information being received from the external device via a transmission path (13), a method selection step of selecting, based on the information received about gamma correction method, a correction method gamma correction method from a plurality of gamma correction methods to the HDR image data, the selected gamma correction method being supported by the external device, a data transmission step of transmitting the HDR image data to the external device (12, 12b) through the transmission path (13) using a differential signal in accordance with the selected gamma correction method, and an information transmission step of transmitting gamma correction information to the image data of HDR via the transmission path (13) to the external device, wherein the gamma correction information for the HDR image data includes gamma correction data in accordance with the selected gamma correction method, and an indication of the selected gamma correction method, the method for transmitting characterized by the fact that the gamma correction information for the HDR image data additionally includes: a flag indicating whether or not processing comprises luminance compression for the HDR image data. HDR is performed in the transmission device (11), and an indication of an amount of gamma correction data. 4. Non-transitory computer-readable memory, characterized by the fact that it comprises stored instructions that, when executed by a computer, cause the computer to execute a method as defined in claim 3. 5. Receiving device (12), characterized by the fact that it comprises: a data receiving unit (12b) that receives image data in a high dynamic range to display an image in the high dynamic range from an external device via a path transmission (13); an information receiving unit that receives information about a transmission method and/or gamma correction information for image data in the high dynamic range that is received at the data receiving unit (12b) from the external device; a data processing unit which, based on transmission method information and/or gamma correction information that is received at the information receiving unit, processes image data in the high dynamic range that is received at the unit data reception (12b); and a storage unit that is an EDID memory that comprises EDID data that includes information about a plurality of gamma corrections that includes the gamma correction for the image data and a name of the receiving device. 6. Receiving device (12) according to claim 5, characterized in that the data receiving unit (12b) receives image data in the high dynamic range from the external device via the transmission path (13) using a differential signal. 7. Receiving device (12) according to claim 6, characterized in that the information receiving unit extracts information about the transmission method and/or information about gamma correction for the image data in the high dynamic range of a blanking period of image data in the high dynamic range that is received at the data receiving unit (12b). 8. Receiving device (12) according to claim 6, characterized in that the information receiving unit receives information about the transmission method and/or information about the gamma correction for the image data in the high dynamic range that is received in the data reception unit (12b) from the external device through a control data line that makes up the transmission path (13). 9. Receiving device (12) according to claim 6, characterized in that the information receiving unit receives information about the transmission method and/or information about the gamma correction for the image data in the high dynamic range that is received at the data receiving unit (12b) from the external device via a bidirectional communication path that is configured from a predetermined line of the transmission path (13). 10. Receiving device (12) according to claim 9, characterized by the fact that the bidirectional communication path is a pair of differential communication paths, and at least one of the differential communication paths in the pair has a function of notifying the external device from a connected state using direct current bias potential. 11. Receiving device (12) according to claim 5, characterized by the fact that the image data in the high dynamic range includes first data and second data, and wherein the data transmission and reception unit receives the first data and the second data, which is configured in a frame format stipulated for a stereoscopic image, from the external device through the transmission path (13). 12. Receiving device (12) according to claim 5, characterized by the fact that the image data in the high dynamic range includes first data and second data, and wherein the data transmission and reception unit receives the first image from frame which is configured from the first data and the second frame image which is configured from the second data, from the external device via the transmission path (13). 13. Receiving device (12) according to claim 5, characterized by the fact that the image data in the high dynamic range includes first data and second data, and wherein the first data is low-order 8-bit image data in the high dynamic range and the second data is high-order bit data of the image in the high dynamic range, or the first data is high-order 8-bit data of the image data in the high dynamic range and the second data is bit data low-order image data in high dynamic range. 14. Receiving device (12) according to claim 5, characterized by the fact that it further comprises: a display control unit (121) that performs a display of whether or not to cancel a power saving mode, in a unit display, when information about the transmission method for the image data in the high dynamic range that is transmitted from the external device is received at the information receiving unit, if the power saving mode is selected. 15. Receiving device (12) according to claim 5, characterized by the fact that it further comprises: an information storage unit in which pieces of information about the transmission method and/or the gamma correction method for the image data in the high dynamic range that the information storage unit itself can support is stored; and an information transmission unit that transmits the transmission method information and/or the gamma correction method information that is stored in the information storage unit, to the external device via the transmission path (13) . 16. Receiving device (12) according to claim 15, characterized by the fact that at least one, among information about maximum luminance at which a display is possible, information about a maximum increase luminance level at which processing for the range High dynamics is possible, and a signal to prohibit augmentation processing is additionally stored in the information storage unit. 17. Receiving device (12) according to claim 15, characterized by the fact that it further comprises: the storage control unit that rewrites a signal to prohibit increase processing, as invalid, which is stored in the information storage unit , if the flag to prohibit augmentation processing is stored in the information storage unit and a power saving mode is selected. 18. Receiving device (12) according to claim 15, characterized by the fact that it further comprises: the storage control unit that rewrites information about maximum luminance at which a display is possible and information about a maximum increase luminance level to which processing for high dynamic range is possible, which are stored in the information storage unit, if information about the maximum luminance at which display is possible and information about the maximum brightness level at which processing stops high dynamic range is possible are stored in the information storage unit and a power saving mode is selected. 19. Method for receiving image data in a high dynamic range, characterized by the fact that it comprises: enabling a data receiving unit (12b) to receive the image data in the high dynamic range from an external device via a transmission path (13); receiving information about a transmission method and/or gamma correction information for image data in the high dynamic range that is received in the data reception step from the external device; processing image data in the high dynamic range that is received in the data reception step, based on information about the transmission method and/or gamma correction information that is received in the information reception step; and sending EDID data from a storage unit that is an EDID memory, the EDID data from the storage unit includes gamma correction information and a name of a receiving device comprising the storage unit. storage. 20. Non-transitory computer-readable memory, characterized in that it comprises stored instructions that, when executed by a computer, cause the computer to execute a method as defined in claim 19.