JP2017169132A - Receiver unit and broadcast communication coordination system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce load in broadcasting a plurality of videos of different brightness ranges.SOLUTION: When determining, on the basis of service information about a service for a program received in broadcast, that there is conversion information used for converting the brightness of a video of the program into a brightness in a second brightness range wider than a predetermined first brightness range, a service information processing unit acquires the conversion information from an acquisition source indicated by control information about service control. On the basis of the conversion information, a brightness adjustment unit converts the brightness of the video to the brightness in the second brightness range. The conversion information indicates a first parameter indicating a correlation between a first boundary brightness and the second boundary brightness, and a second parameter indicating a correlation between the maximum brightness in the first brightness range and the maximum brightness in the second brightness range. The first boundary brightness is the boundary between a first low brightness range lower than the first brightness range and a first high brightness range higher than the first brightness range. The second boundary brightness is the boundary between a second low brightness range lower than the second brightness range and a second high brightness range higher than the second brightness range.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a receiving apparatus and a broadcasting / communication cooperation system.

Due to the improvement of display technology, a high dynamic range (HDR) display capable of displaying an image with a wider range of brightness than before has started to be marketed. Maximum luminance of the HDR display, for example, while a 500~1000cd / ^{m 2,} a maximum brightness of the conventional display is about 100 cd / ^{m 2.} The luminance range of the conventional image is sometimes called a standard dynamic range (SDR).

  As part of the advancement of broadcasting, introduction of HDR video into so-called 4K / 8K broadcasting is being studied. 4K / 8K broadcasting is a common name for Ultra High Definition Television (UHDTV) that broadcasts video having 3840 × 2160 pixels or 7680 × 4320 pixels. HDR video and SDR video are videos whose luminance ranges are HDR and SDR. However, the HDR display does not necessarily spread to all recipients, and there is a possibility that a recipient having an SDR display and a recipient having an HDR display are mixed. For this reason, it is desirable for a broadcaster or content provider to broadcast both HDR video and SDR video as video of one program. For this purpose, the broadcaster converts, for example, a conventionally produced SDR video into an HDR video using the method described in Patent Document 1.

JP2015-144404A

However, in order to broadcast both the SDR video and the HDR video, it is necessary to prepare an HDR video having the same content as the SDR video in addition to the SDR video already produced. When preparing an HDR video, for example, it is conceivable to use the method described in Patent Document 1. Also, equipment for transmitting both SDR video and HDR video, for example, a multiplexing device, use of other channels, and the like are required.
For this reason, there has been a problem that a broadcaster is burdened by broadcasting a plurality of videos having different luminance ranges.

  The present invention has been made to solve the above-described problems, and one aspect of the present invention is to set the luminance of the video of the program from a predetermined first luminance range based on service information related to the service of the program received by broadcasting. A service information processing unit that obtains the conversion information by communication from an acquisition destination indicated by the control information related to the control of the service when it is determined that there is conversion information used for conversion to luminance within a wide second luminance range; A luminance adjusting unit that converts the luminance of the video into luminance within the second luminance range based on conversion information, and the conversion information indicates a correspondence relationship between the first boundary luminance and the second boundary luminance. 1 parameter and a second parameter indicating a correspondence relationship between the maximum luminance of the first luminance range and the maximum luminance of the second luminance range, and the first boundary luminance is lower than that of the first luminance range range A boundary between a first low luminance range and a first high luminance range which is a higher luminance range, and the second boundary luminance is a second low luminance range which is a lower luminance range of the second luminance range; The receiving device is a boundary with the second high luminance range which is a higher luminance range.

  According to the embodiment of the present invention, the burden when broadcasting a plurality of videos having different luminance ranges is reduced.

It is a schematic block diagram which shows the structure of the broadcast communication cooperation system which concerns on this embodiment. It is a schematic block diagram which shows the function structure of the transmitter which concerns on this embodiment. It is a schematic block diagram which shows the structure of the receiver which concerns on this embodiment. It is a figure which shows an example of the data structure of MPT which concerns on this embodiment. It is a figure which shows an example of the data structure of the application service descriptor which concerns on this embodiment. It is a figure which shows an example of the data structure of MH-AIT which concerns on this embodiment. It is a figure which shows an example of the data structure of the MH-transmission protocol descriptor concerning this embodiment. It is a figure which shows an example of the data structure of MH-EIT which concerns on this embodiment. It is a figure which shows an example of the data structure of the video component descriptor which concerns on this embodiment. It is a figure which shows an example of the conversion information which concerns on this embodiment. It is a figure which shows the example of the receiver information which concerns on the modification of this embodiment. It is a figure which shows the example of the maximum luminance information which concerns on this embodiment. It is explanatory drawing of an example of the conversion process of the 1st brightness | luminance adjustment part which concerns on this embodiment. It is explanatory drawing of the other example of the conversion process of the 1st brightness | luminance adjustment part which concerns on this embodiment. It is explanatory drawing of the further another example of the conversion process of the 1st brightness | luminance adjustment part which concerns on this embodiment. It is a figure which shows the example of the conversion information which concerns on the low-intensity mode which concerns on the modification of this embodiment. It is a figure which shows an example of the confirmation screen which concerns on one modification of this embodiment. It is explanatory drawing of an example of the conversion information which concerns on the other modification of this embodiment. It is explanatory drawing of the other example of the conversion information which concerns on the other modification of this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, the broadcasting / communication cooperation system 1 according to the first embodiment of the present invention will be described.
FIG. 1 is a schematic block diagram illustrating a configuration of a broadcast communication cooperation system 1 according to the present embodiment.
The broadcasting / communication cooperation system 1 includes a transmission device 10, a reception device 20, a first communication device 30, and a second communication device 40. The number of the transmission device 10, the reception device 20, the first communication device 30, and the second communication device 40 shown in FIG. 1 is one each, but can generally be plural.

  The transmission device 10 multiplexes service information and control information for program data representing broadcast program content to generate multiplexed data, and the generated multiplexed data is transmitted to the reception device 20 via the broadcast transmission path BT. Send to. Video is included as content. In the following description, the transmitted video is mainly SDR video. The service information is information related to the program service. The control information is information related to the control of the service. The broadcast transmission path BT is a transmission path for unilaterally and simultaneously transmitting program data to an unspecified number of receiving devices 20. The broadcast transmission path BT is a broadcast wave having a predetermined frequency band, for example. The broadcast transmission path BT may include a broadcast satellite BS that relays broadcast waves. A part of the broadcast transmission path BT may include a network, for example, a dedicated line or a VPN (Virtual Private Network). Note that transmission (or transmission, reception, acquisition) of various data via the broadcast transmission path BT may be referred to as “transmission (or transmission, reception, acquisition)”. The transmission device 10 constitutes, for example, broadcasting equipment possessed by a broadcasting company.

  The receiving device 20 receives multiplexed data transmitted via the broadcast transmission path BT. The receiving device 20 separates the received multiplexed data into program data, service information, and control information. The receiving device 20 displays an image based on the received program data. The receiving device 20 is an electronic device such as a television receiving device or a set-top box that can receive program data and display a video related to the received program data on a display unit. The receiving device 20 determines the presence / absence of conversion information used for converting the luminance of the SDR video to the HDR luminance based on the service information. When determining that there is conversion information, the receiving device 20 acquires the conversion information from the first communication device 30 that is the acquisition destination indicated by the control information via the network NW. At that time, the receiving device 20 transmits a conversion information request signal indicating a request for conversion information of the program to the first communication device 30.

  The network NW is a transmission path for bidirectionally transmitting various data between the receiving device 20 and the first communication device 30 and the second communication device 40. The network NW includes, for example, a wide area communication network such as the Internet or a public wireless communication network. The network NW may partially include a local area network (LAN) or a dedicated access network. Note that transmission (or transmission, reception, acquisition) of various data via the network NW may be referred to as “transmission (or transmission, reception, acquisition)”.

Using the conversion information, the receiving device 20 converts the luminance into a luminance within the HDR luminance range that is wider than the SDR. The conversion information is information indicating parameters used for luminance conversion for expanding the luminance range of the SDR video at a different expansion rate between the luminance in the first low luminance range and the luminance in the first high luminance range in the SDR video. . This luminance conversion method is also called knee (KNEE) conversion. The conversion information includes parameter 1 and parameter 2 as two types of parameters. Parameter 1 indicates the relationship between the first boundary luminance that is the boundary between the first low luminance range and the first high luminance range, and the second boundary luminance that is the luminance after conversion. Parameter 1 is also called the knee point. Parameter 2 indicates the relationship between the first maximum brightness that is the maximum brightness of the SDR video and the second maximum brightness that is the maximum brightness of the converted HDR video. In the example shown in FIG. 10, (40, 40) of parameter 1 indicates that the first boundary luminance and the second boundary luminance are 40 and 40, respectively. Parameter 2 (100,800) indicates that the first maximum brightness, the second maximum brightness, respectively ^{100cd / m 2, 800cd / m} 2.

The control information includes model-specific acquisition destination information indicating the acquisition destination of the maximum luminance information indicating the maximum luminance that can be displayed as the performance of the display unit that displays the video, for each model of the display unit. The receiving device 20 refers to the model-specific acquisition destination information corresponding to the model of the display unit connected to the own device, and receives the second communication device 40, which is the acquisition destination indicated by the model-specific acquisition destination information, via the network NW. Get maximum brightness information. At that time, the receiving device 20 transmits a maximum luminance information request signal related to the program and the model to the second communication device 40. The maximum luminance information is information indicating the maximum luminance for displaying the received video. The receiving device 20 converts the luminance of the converted video into luminance within the maximum luminance range indicated by the maximum luminance information. In the example shown in FIG. 12, the model A1, the model A2, respectively ^{900cd / m 2, 800cd / m} 2. The maximum luminance information may be stored in a device common to a plurality of models or performances, that is, the second communication device 40, as long as they are distinguished according to the models or performances.

  The first communication device 30 is a communication device that transmits and receives various data between the reception device 20 and the second communication device 40 via the network NW. The first communication device 30 includes a storage unit that stores video conversion information for each program. The first communication device 30 receives the conversion information request signal from the reception device 20 and transmits the conversion information of the program indicated by the conversion information request signal to the reception device 20 as a response. The first communication device 30 is, for example, a server device managed by a broadcaster or a program producer of the program.

  The second communication device 40 is a communication device that transmits and receives various data between the receiving device 20 and the first communication device 30 via the network NW. The 2nd communication apparatus 40 is provided with the memory | storage part which has memorize | stored the maximum luminance information for every model of a program and a display part. The second communication device 40 receives the maximum luminance information request signal from the receiving device 20, and transmits the program and model conversion information indicated by the maximum luminance information request signal to the receiving device 20 as a response. The second communication device 40 is, for example, a server device managed by the manufacturer, distributor, or maintenance manager of the display unit 22.

(Transmitter)
Next, a functional configuration of the transmission device 10 according to the present embodiment will be described.
FIG. 2 is a schematic block diagram illustrating a functional configuration of the transmission device 10 according to the present embodiment.
The transmission apparatus 10 includes a service information acquisition unit 110, a video encoding unit 120, an audio encoding unit 130, a multiplexing unit 150, an encryption unit 160, and a transmission unit 170.

  The service information acquisition unit 110 generates service information of a broadcast program. The service information is information related to the provision of a broadcast service such as the program provision form and configuration. The service information is stored, for example, in MMT-SI (Service Information) used in the MMT (MPEG Media Transport) method, which is one method of transmission multiplexing. The MMT-SI includes, for example, MPT (MMT Package Table; MMT Package Table), MH-EIT (MH-Event Information Table, MH-Event Information Table), and MH-AIT Application Information Table (MH-AIT: Application Information Table). Is included.

The MPT is a data table including a list of assets that are components of a program being received at that time (current), that is, a list of video and audio, and information indicating the provision conditions thereof.
The MH-EIT is a data table including information on the program for each program broadcast at that time and in the future, for example, information indicating the program name, broadcast date and time, description of the broadcast content, and the like. In the present embodiment, the service information acquisition unit 110 includes luminance information, which is information related to the luminance range of the video constituting the program, in the MH-EIT. The luminance information includes an information flag indicating the presence / absence of conversion information for conversion to luminance in HDR when the luminance range is SDR.

  MH-AIT is an information table in which application control information is stored. The application control information is control information for controlling acquisition of commands and information for realizing functions described in an application program (hereinafter referred to as an application) related to a program being broadcast at that time. The application is described in a predetermined description language (for example, HTML5), and commands and information for realizing various functions related to program presentation are described. The application control information includes information for controlling execution of application acquisition destination information, application activation, stop, and the like. In this embodiment, conversion information for each program and maximum luminance information for each model are included in separate applications. The service information acquisition unit 110 outputs the input control information to the multiplexing unit 150.

More detailed service information will be described later. The service information acquisition unit 110 outputs the acquired service information to the multiplexing unit 150 every predetermined time (for example, 0.1 to 0.5 ms). The service information is updated as the program progresses. If not updated, the same service information is repeated a plurality of times. Thereby, the receiving device 20 can present a program based on the broadcast signal received at an arbitrary time.
The service information acquisition unit 110 may receive service information generated in advance from another device.

  The video encoding unit 120 encodes input video data using a predetermined encoding method (for example, ISO / IEC 23008-2 HEVC: High Efficiency Video Coding). The video encoding unit 120 generates video data including video encoded data obtained by encoding. The video encoding unit 120 outputs the generated video data to the multiplexing unit 150.

  The audio encoding unit 130 encodes input audio data using a predetermined encoding method (for example, ISO / IEC 14496-3 MPEG-4 AUDIO). The speech encoding unit 130 outputs speech data including speech encoded data obtained by encoding to the multiplexing unit 150.

  The multiplexing unit 150 multiplexes the service information input from the service information acquisition unit 110, the video data input from the video encoding unit 120, and the audio data input from the audio encoding unit 130 to obtain a predetermined format ( For example, multiplexed data having MMT format) is generated. The multiplexing unit 150 outputs the generated multiplexed data to the encryption unit 160.

The encryption unit 160 encrypts the multiplexed data input from the multiplexing unit 150 using a predetermined encryption method (for example, AES: Advanced Encryption Standard). The encryption unit 160 outputs the encrypted data obtained by the encryption to the transmission unit 170.
The transmission unit 170 modulates the encrypted data input from the encryption unit 160 to generate a broadcast signal having a predetermined frequency band. The transmission unit 170 transmits the generated broadcast signal to the broadcast transmission path BT. The broadcast signal is transmitted as a broadcast wave. Therefore, a broadcast signal carrying multiplexed data obtained by multiplexing service information, program data, and control information is transmitted via the broadcast transmission path BT. The transmission unit 170 includes, for example, a transmitter.

(Receiver configuration)
Next, the configuration of the receiving device 20 according to this embodiment will be described.
FIG. 3 is a schematic block diagram illustrating a configuration of the receiving device 20 according to the present embodiment.
The receiving device 20 includes a tuner 211, a reception processing unit 212, a decoding unit 213, a separation unit 214, an input unit 215, a video decoding unit 221, a display processing unit 222, a control unit 240, a storage unit 250, a communication unit 260, and a display unit 22. And a loudspeaker 23. One or both of the display unit 22 and the loudspeaker unit 23 may be detachable from the main body of the receiving device 20.

  A tuner 211 receives a channel selection signal from the channel selection unit 241 of the control unit 240. The tuner 211 receives a broadcast signal transmitted through a channel indicated by the channel selection signal. The tuner 211 demodulates the received broadcast signal and outputs encrypted data obtained by the demodulation to the reception processing unit 212.

  The reception processing unit 212 performs a predetermined reception process on the encrypted data input from the tuner 211 or the communication unit 260. The predetermined reception processing includes removal of the header part used for transmission, error detection, error correction processing, and the like. The reception processing unit 212 outputs the encrypted data obtained by performing the reception process to the decryption unit 213.

  The decryption unit 213 decrypts the encrypted data input from the reception processing unit 212 using a predetermined decryption method. The predetermined decryption method is a decryption method corresponding to the encryption method used for generating the encrypted data, that is, the encryption method used by the encryption unit 160. The decoding unit 213 outputs the multiplexed data obtained by the decoding to the separation unit 214.

  The separation unit 214 separates program data and service information from the multiplexed data input from the decoding unit 213. The separation unit 214 separates video data and audio data from the program data. The separation unit 214 outputs the separated video data to the video decoding unit 221, and outputs the separated audio data to the audio decoding unit 231. The separation unit 214 outputs the separated service information to the service information processing unit 242.

  The input unit 215 receives an operation signal generated by a user operation. The input unit 215 includes, for example, an infrared interface that receives an operation signal from a remote controller (control device) RC using infrared rays. For example, the operation signal specifies information such as power on / off, a channel for receiving a broadcast wave, luminance, and luminance range. The input unit 215 outputs an operation signal to the control unit 240. Note that the input unit 215 may include a physical member for receiving a user operation, for example, various buttons and knobs, and may generate an operation signal corresponding to the operation. The input unit 215 outputs the input operation signal to the control unit 240.

  Video data in a format designated by the service information processing unit 242 is input from the separation unit 214 to the video decoding unit 221. The video decoding unit 221 decodes the input video data using a predetermined video decoding method. The predetermined video decoding method is a decoding method corresponding to the encoding method used by the video encoding unit 120. The video decoding unit 221 outputs the decoded video data to the display processing unit 222.

  The display processing unit 222 performs processing related to the video displayed on the display unit 22. The display processing unit 222 includes a first luminance adjustment unit 223 and a second luminance adjustment unit 224. The first luminance adjustment unit 223 performs knee conversion on the luminance of the SDR video indicated by the SDR video data input from the video decoding unit 221 based on the conversion information input from the service information processing unit 242, and converts the HDR video data to Generate. As will be described later, the conversion information is acquired from the first communication device 30. The first luminance adjusting unit 223 outputs HDR video data indicating the HDR video having the luminance obtained by the conversion to the second luminance adjusting unit 224.

  The second luminance adjustment unit 224 converts the luminance of the HDR video indicated by the HDR video data input from the first luminance adjustment unit 223 into the luminance within the maximum luminance range indicated by the maximum luminance information. The second luminance adjustment unit 224 uses the maximum luminance information input from the service information processing unit 242 as the maximum luminance information. As will be described later, the maximum luminance information is information indicating the maximum luminance that can be displayed by the display unit 22, and is acquired from the second communication device 40. The second luminance adjustment unit 224 outputs video data indicating a video having luminance obtained by the conversion to the display unit 22. An example of luminance conversion performed by the first luminance adjusting unit 223 and the second luminance adjusting unit 224 will be described later.

  When the screen data is input from the control unit 240, the display processing unit 222 generates display data by superimposing the screen indicated by the screen data on the video indicated by the video data input from the video decoding unit 221. The display processing unit 222 outputs the generated display data to the display unit 22. Thereby, the display processing unit 222 causes the display unit 22 to display the screen indicated by the screen data input from the control unit 240. Examples of the screen displayed on the display unit 22 include various setting screens, warning screens, notification screens, and dialog screens.

  The display unit 22 displays the video data input from the display processing unit 222 or the video indicated by the display data. The display unit 22 is an organic EL (Electroluminescence) display, for example.

  Audio data in a format instructed by the service information processing unit 242 is input from the separation unit 214 to the audio decoding unit 231. The voice decoding unit 231 decodes the input voice data using a predetermined voice decoding method. The predetermined speech decoding method is a decoding method corresponding to the encoding method used by the speech encoding unit 130. The voice decoding unit 231 outputs the decoded voice data to the loudspeaker unit 23.

  The loudspeaker 23 reproduces voice based on the voice data input from the voice decoder 231. The loudspeaker 23 includes, for example, a speaker.

The control unit 240 performs various controls related to the operation of the receiving device 20. The control unit 240 includes a channel selection unit 241 and a service information processing unit 242.
The channel selection unit 241 identifies a channel that receives a broadcast signal from the operation signal input from the input unit 215. The channel selection unit 241 generates a channel selection signal that indicates the identified channel, and outputs the generated channel selection signal to the tuner 211.

  The service information processing unit 242 performs various controls related to the presentation of the program based on the service information input from the separation unit 214. The service information processing unit 242 extracts MH-EIT from the service information. The service information processing unit 242 detects luminance information of a program broadcast at that time from the MH-EIT. The service information processing unit 242 extracts the MPT from the service information when the luminance range indicated by the detected luminance information is SDR and the information flag indicates that there is conversion information for conversion to luminance in the HDR. The service information processing unit 242 acquires the MH-AIT from the separation unit 214 based on the arrangement information indicated by the MPT.

The service information processing unit 242 includes an application control unit 243 and an application execution unit 244.
The application control unit 243 controls the acquisition of the application acquired from the separation unit 214 based on the acquired MH-AIT and the process indicated by the command described in the acquired application. Note that performing the processing instructed by an instruction described in the application is called “execution of application” or “execution of application”.

  The application control unit 243 according to the present embodiment uses a conversion information request signal indicating a request for conversion information related to a broadcast program as acquisition source information described in the MH-AIT via the communication unit 260 and the network NW. For example, it transmits to the 1st communication apparatus 30 designated by URL (Uniform Resource Locator). In response to receiving the conversion information request signal from the receiving device 20, the first communication device 30 transmits the application 1 including the conversion information related to the program to the receiving device 20 via the network NW. The application control unit 243 outputs the application 1 received from the first communication device 30 to the application execution unit 244.

  The application control unit 243 reads device information that identifies the display unit 22 from the setting information of the own device stored in the storage unit 250. The device information includes, for example, model information indicating the model (model, model number) of the display unit 22. Depending on the model, the displayable luminance range, particularly the maximum luminance, may vary as performance. The application control unit 243 identifies the model-specific acquisition destination information of the model indicated by the read model information among the model-specific acquisition destination information for each model described in the application. For example, the application control unit 243 transmits the maximum luminance information request signal to the second communication device 40 specified by the URL as model-specific acquisition destination information specified via the communication unit 260 and the network NW. The maximum luminance information request signal is a signal indicating a request for maximum luminance information according to the model of the display unit 22 related to the program being broadcast. In response to receiving the maximum luminance information request signal from the receiving device 20, the second communication device 40 transmits the application 2 including the program and the maximum luminance information relating to the model to the receiving device 20 via the network NW. The application control unit 243 outputs the application 2 received from the second communication device 40 to the application execution unit 244. The application control unit 243 controls execution of the application output to the application execution unit 244 based on various commands included in the application control information.

  The application execution unit 244 executes the application input from the application control unit 243. The application execution unit 244 outputs the conversion information included in the application 1 to the first luminance adjustment unit 223. Thus, the application execution unit 244 causes the first luminance adjustment unit 223 to perform luminance conversion based on the output conversion information. The application execution unit 244 outputs the maximum luminance information included in the application 2 to the second luminance adjustment unit 224. Thus, the application execution unit 244 causes the second luminance adjustment unit 224 to perform luminance conversion based on the output maximum luminance information.

  The storage unit 250 stores various data such as setting data used by the control unit 240 and data acquired by the control unit 240. The storage unit 250 includes various storage media such as a RAM (Random Access Memory) and a ROM (Read-only Memory). In addition, the storage unit 250 includes a storage medium (for example, a BD (Blu-ray (registered trademark) Disc)) that stores video data of received broadcast programs and video data of content such as movies that have been produced in advance. It may be configured. The storage unit 250 may store broadcast program data and service information and control information multiplexed on the broadcast program data in association with each other.

  The communication unit 260 outputs various reception data received from devices connected via the network NW to the control unit 240, and transmits various transmission data input from the control unit 240 to the device. In the present embodiment, the communication unit 260 is connected to the first communication device 30 and the second communication device 40, respectively. Note that the communication unit 260 outputs MMT format data received via the network NW to the reception processing unit 212. The communication unit 260 is, for example, a communication interface.

(Service information, control information)
Next, service information and control information transmitted multiplexed with program data will be described.
In the MMT scheme, service information is stored in MMT-SI. The MMT-SI includes a PA (Package Access) message and an M2 section message. The PA message is a message serving as an entry point for MMT-SI. The MMT-SI table is stored in the PA message and transmitted. The M2 section message is a message for transmitting the section extension format of MPEG-2 Systems. In the M2 section message, MH-EIT and MH-AIT are stored and transmitted.

The MMT-SI table includes MPT and MH-EIT. The MPT is a data table in which constituent elements of a program that is a broadcast service being received are described. The service information processing unit 242 can acquire the MPT of the program only while the channel on which the program is broadcast is selected. The MH-EIT is a data table in which program information for each program that is an event broadcast at that time and in the future is described. The MH-EIT may be used to construct a program guide.
The MH-AIT is a data table in which all information related to an application and information indicating an activation state requested by the application are stored. In other words, MH-AIT is a data table used for transmission of dynamic control information related to an application and additional information necessary for execution.

(MPT)
Next, an example of the MPT data structure will be described. FIG. 4 is a diagram illustrating an example of the data structure of the MPT according to the present embodiment.
The MPT includes an MPT descriptor area (MPT_descriptors_byte) and an asset type (asset_type) for each asset that is a component of the program. The MPT descriptor area is a data area in which an MPT descriptor is stored. In this embodiment, an application service descriptor is described in the MPT descriptor area. The asset type is information indicating the type of asset. For example, an asset in which “hvc1” is described as the asset type indicates video, and an asset in which “mp4a” is described as the asset type indicates audio.

  The application service descriptor describes MH-AIT in which application control information related to a data broadcast application linked to a program being received is described, data transmission message, and event message table (EMT: Event Message Table) arrangement information. Descriptor. The data transmission message describes the arrangement of the content body of the data broadcast. An event message is described in the EMT.

FIG. 5 is a diagram showing an example of the data structure of the application service descriptor according to the present embodiment.
The application service descriptor (Application_Service_Descriptor) includes a default AIT flag (default_AIT_flag) and AIT location information (AIT_location_info) as application control information. The default AIT flag is an information flag indicating the application control information to be monitored. For example, the value of the default AIT flag being “1” indicates that the default monitoring target application control information is MH-AIT. Therefore, the service information processing unit 242 detects that “1” is set as the default AIT flag of the application service descriptor, and determines the presence of the MH-AIT as the application control information to be monitored.

  The AIT location information is information indicating a location where the MH-AIT can be acquired in the form of location information (MMT_general_location_info). The location information is information indicating the location. The location information is represented by, for example, a packet ID in which data is stored, a source and destination IP address, a URL, and the like. The service information processing unit 242 acquires the MH-AIT from the location indicated by the location information. As the location, for example, a data packet in which MH-AIT is stored is designated. Note that the control information may be transmitted from the first communication device 30 without being multiplexed with program data and other service information from the transmission device 10 and transmitted as MH-AIT. In this case, the IP address or URL of the first communication device 30 that is the transmission source is designated as the location of the control information.

(MH-AIT)
Next, an example of the data structure of MH-AIT will be described. FIG. 6 is a diagram illustrating an example of the data structure of the MH-AIT according to the present embodiment.
The MH-AIT includes an application format (application_type), an application identifier (application_identifier), and a descriptor area (descriptor) for each application. The application format indicates the format of an application to be controlled by the MH-AIT. For example, an application format value of “0x0011” indicates that the application is an application described in ARIB-HTML5 as a description language. The application control unit 243 detects that the value of the application format is “0x0011”, and analyzes the data representing the acquired application as information described based on ARIB-HTML5.

The application identifier is a value that uniquely identifies each application. In the present embodiment, conversion information for each program and maximum luminance information for each model of the display unit 22 are identified using an application identifier. Therefore, the application control unit 243 indicates, from the application identifier described in the MH-AIT, the application identifier indicating the conversion information of the broadcast program and the maximum luminance information related to the model of the display unit 22 related to the device itself. Specify the application identifier. The model of the display unit 22 is specified based on the setting information stored in the storage unit 250 as described above.
The descriptor area is a data area in which a description for each application identifier is described. In the descriptor area, an MH-transmission protocol descriptor is described.

FIG. 7 is a diagram illustrating an example of the data structure of the MH-transmission protocol descriptor according to the present embodiment.
The MH-Transport Protocol Descriptor (MH-Transport_Protocol_Descriptor) is a descriptor indicating the transmission protocol of the application and the location of the application. The MH-transmission protocol descriptor includes a protocol identification (protocol_id) and a selector area (selector_byte). The protocol identification is information indicating a protocol for transmitting an application. For example, the protocol identification value “0x0003” indicates HTTP / HTTPS (Hypertext Transfer Protocol / Hypertext Transfer Protocol Secure) transmission. The selector area includes a URL base (URL_base_byte). The URL base is a data area in which a character string of a URL base part representing an application acquisition destination is stored. The URL base includes the domain name, folder name, and file name of the device in which the data is stored.

  In the present embodiment, the folder in which the file of the first communication device 30 is stored is designated on a URL basis as the acquisition destination information of the file in which the conversion information is stored. As the acquisition destination information of the file storing the maximum luminance information, the folder storing the file stored in the second communication device 40 is designated by the URL base. The application control unit 243 acquires the conversion information from the first communication device 30 that specifies the file in which the conversion information is stored on a URL basis, using the protocol specified by the protocol identification. The application control unit 243 acquires the maximum luminance information from the second communication device 40 that specifies the file storing the maximum luminance information on a URL basis by using the protocol specified by the protocol identification.

(MH-EIT)
Next, an example of the data structure of MH-EIT will be described. FIG. 8 is a diagram illustrating an example of the data structure of the MH-EIT according to the present embodiment.
The MH-EIT includes an event identification (event_ID) and a descriptor area (descriptor) for each event. Event identification indicates an identification number of an event, that is, a program. The descriptor area is an area for storing descriptors representing various types of information related to the program. In this embodiment, a video component descriptor is described in the descriptor area. The video component descriptor is a descriptor in which various parameters and explanations related to video data in the program data are described. The service information processing unit 242 identifies the identifier of the program being broadcast at that time.

FIG. 9 is a diagram showing an example of the data structure of the video component descriptor according to the present embodiment.
The video component descriptor (Video_Component_Descriptor) includes a video signal transfer characteristic (video_transfer_characteristics) and an unused area (reserved). The video signal transfer characteristic is information for identifying the transfer characteristic of the video signal. For example, a video signal transfer characteristic value of “6” indicates that conversion information exists in a device connected to the network NW. This corresponds to the value of the video display information (VUI: Video Usability Information) being 14. When the service information processing unit 242 detects that the value of the video signal transfer characteristic is “6”, the application control unit 243 performs a process of acquiring the above-described conversion information and maximum luminance information. When the service information processing unit 242 detects that the value of the video signal transfer characteristic is any other value, the application control unit 243 does not perform the process of acquiring the conversion information and the maximum luminance information described above.

  Note that a luminance range conversion flag (DR_flag) may be described in the unused area. The luminance range conversion flag is a 1-bit information flag indicating whether conversion information exists in a device connected to the network NW. The value “1” indicates that conversion information exists (not default), and “0” indicates that conversion information does not exist (default). When the service information processing unit 242 detects that the value of the luminance range conversion flag is “1” regardless of whether the value of the video signal transfer characteristic is “6”, the application control unit 243 Processing for obtaining conversion information and maximum luminance information is performed. When detecting that the value of the luminance range conversion flag described above is “0”, the application control unit 243 does not perform the process of acquiring the conversion information and the maximum luminance information described above.

(Conversion processing)
Next, an example of conversion processing performed by the first luminance adjustment unit 223 will be described with reference to FIGS.
FIG. 13A shows an example of a video broadcast in a certain program. The image shown in FIG. 13 (A) represents a sandy beach facing the shore taken under clear sky. Since the video includes many bright areas, the broadcaster or video producer may want to express the gradation of the high brightness area clearly. FIG. 13B shows the conversion information set for the video of this program. In this example, parameter 1 is set to (20, 20) and parameter 2 is set to (100, 400).

FIG. 13C shows conversion characteristics expressed based on the set parameter 1 and parameter 2. In FIG. 13C, the horizontal axis and the vertical axis indicate the brightness of the input SDR video and the brightness of the HDR video output, respectively. 100% and 400% on the horizontal and vertical axes are values obtained by normalizing the first maximum luminance of the SDR video before conversion and the second maximum luminance of the HDR video after conversion by the first maximum luminance, respectively. . The solid line indicates that the first luminance adjustment unit 223 does not convert the luminance within the first low luminance range of 0 to 20% (in this case, 0 to 20 cd / m ² ) of the input SDR video, and does not convert the HDR as it is. This is adopted as the luminance within the second low luminance range of the video. Further, the solid line indicates that the luminance within the first high luminance range of 20 to 100% (in this case, 20 to 100 cd / m ² ) of the input SDR video by the first luminance adjustment unit 223 is 20 to 400%. It indicates that the luminance is expanded to a luminance within the second high luminance range (in this case, 20 to 400 cd / m ² ). The one-dot broken line indicates that the luminance within the luminance range of the input SDR video is expanded to the luminance within the luminance range of the HDR video using a certain expansion rate.

  FIG. 13D shows the luminance range of the SDR video before conversion and the luminance range of the HDR video after conversion. According to the conversion information shown in FIG. 13B, parameter 1 gives a lower boundary luminance as the second boundary luminance with respect to the first boundary luminance than when a constant expansion rate is used. Become wider. Also, since the first low luminance range is narrower than the first high luminance range, the second low luminance range is much narrower than the second high luminance range. Therefore, the gradation of the high luminance region belonging to the second high luminance range is clearly expressed. As the second maximum brightness indicated by the parameter 2, the maximum brightness that can be expressed by a display used by a broadcaster or a video producer for video production, adjustment, or monitoring (monitoring) may be used. The display serves as a reference for the brightness of the converted HDR video.

In the example illustrated in FIGS. 13 to 15, the conversion information is represented by physical luminance (unit: cd / m ² ), but the first luminance adjustment unit 223 may perform luminance conversion based on the luminance value. In luminance value-based luminance conversion, the first luminance adjustment unit 223 adjusts the luminance value for each pixel that gives the luminance before conversion indicated by the input SDR video data (for example, in the case of 8 bits, the first luminance adjustment unit 223 adjusts the luminance value between 16 and 240). (Numerical value) is converted into a luminance value for each pixel that gives the luminance after conversion (for example, in the case of 10 bits, an integer value between 64 and 960). Data indicating the luminance value for each pixel after conversion is HDR video data.

  In that case, the first luminance adjustment unit 223 converts the luminance value indicated by the SDR video data into luminance before conversion using an electro-optic conversion function (EOTF). Then, the first luminance adjustment unit 223 calculates the luminance after conversion corresponding to the luminance before conversion converted based on the conversion information. Thereafter, the first luminance adjustment unit 223 converts the calculated luminance after conversion into a luminance value of the HDR video data using a photoelectric conversion function (OETF: Optical-Electro Transfer Function). As EOTF and OFTF, for example, ITU-R (International Telecommunication Union) recommendation BT. EOTF defined in 1886 and OETF as its inverse function can be used.

The first luminance adjustment unit 223 calculates an output luminance value indicating the luminance after conversion of the corresponding output for each input luminance value indicating the luminance before conversion of the input based on the conversion information, A conversion table in which the output luminance value calculated from the input luminance value is associated may be generated. The first luminance adjustment unit 223 refers to the conversion table and converts the luminance value for each pixel indicated by the SDR video data into the luminance value for each pixel indicated by the HDR video data. Thereby, the process which converts a luminance value sequentially is abbreviate | omitted.
Further, contrast, brightness, and gamma values set in the display unit 22 may be used as OETF and EOTF parameters.

FIG. 14A shows an example of a video broadcast in another program. The image shown in FIG. 14A represents fireworks launched in the air at night. Since video contains both dark and bright areas, broadcasters or video producers may want to express color shades clearly. FIG. 14B shows conversion information set for the video of this program. In this example, parameter 1 is set to (80, 80) and parameter 2 is set to (100, 400). FIG. 14C shows conversion characteristics expressed based on the set parameter 1 and parameter 2. FIG. 14D shows the luminance range before and after conversion. In this example, the first luminance adjustment unit 223 adjusts the luminance within the first high luminance range of 80 to 100% (in this case, 80 to 100 cd / m ² ) of the input SDR video to 80 to 400% ( In this case, the luminance is expanded to a luminance within the second high luminance range of 80 to 400 cd / m ² ). However, the first luminance adjustment unit 223 adjusts the luminance within the first low luminance range of 0 to 80% (in this case, 0 to 80 cd / m ² ) of the input SDR video as it is, from 0 to 80% (this In this case, it is adopted as the luminance within the second low luminance range of 0 to 80 cd / m ² ). According to the conversion information shown in FIG. 14B, parameter 1 gives a lower boundary luminance as the second boundary luminance relative to the first boundary luminance than when a constant expansion rate is used. Also, since the first low luminance range is wider than the first high luminance range, the second low luminance range is not as narrow as the example shown in FIG. For this reason, in the converted HDR video, shading clearly appears between the high luminance region and the low luminance region.

FIG. 15A shows an example of a video broadcast in another program. The video shown in FIG. 15A represents a person who plays ballet on the stage. Since the video includes a dark area as a whole, the broadcaster or the video producer may want to express the gradation of the dark part clearly. FIG. 15B shows conversion information set for the video of this program. In this example, parameter 1 is set to (50, 320) and parameter 2 is set to (100, 400). FIG. 15C shows the conversion characteristics expressed based on the set parameter 1 and parameter 2. FIG. 15D shows the luminance range before and after conversion. In this example, the first luminance adjustment unit 223 adjusts the luminance within the first low luminance range of 0 to 50% (in this case, 0 to 50 cd / m ² ) in the input SDR video to 0 to 320% ( In this case, the luminance is expanded within the second low luminance range of 0 to 320 cd / m ² ). The first luminance adjusting unit 223 adjusts the luminance within the first high luminance range of 50 to 100% (in this case, 50 to 100 cd / m ² ) of the input SDR video to 320 to 400% (in this case, 320 To a luminance within the second high luminance range of .about.400 cd / m ² ). According to the conversion information shown in FIG. 15B, parameter 1 gives a higher boundary luminance as the second boundary luminance with respect to the first boundary luminance than when a constant expansion rate is used. Further, since the first low luminance range is equivalent to the first high luminance range, the second low luminance range is wider than the examples shown in FIGS. For this reason, in the converted HDR video, the gradation appears clearly in the low luminance region where the luminance is low.

As described above, the first luminance adjusting unit 223 converts the luminance of the SDR video using the conversion information appropriately set according to the luminance distribution of the video for each program, and thereby has high effect HDR. Can be converted to video.
Note that the second maximum brightness constituting the second parameter indicated by the conversion information may be equal to the maximum brightness that can be displayed on the standard display, but even if it is HDR predetermined maximum brightness (for example, 900 cd / m ² ). Good. Even in this case, an HDR video based on the luminance independent of the model of the display unit 22 is generated. Further, the second maximum luminance may be the maximum luminance value indicated by the converted HDR video data. As will be described later, the second luminance adjustment unit 224 adjusts the luminance within a luminance range that can vary depending on the program to a luminance range that can be displayed by the display unit 22, and thus the luminance that can be displayed by the display unit 22 for each program. The range can be fully utilized.

Next, an example of conversion processing performed by the second luminance adjustment unit 224 will be described. The second luminance adjustment unit 224 converts the luminance of the HDR video indicated by the HDR video data input from the first luminance adjustment unit 223 into the luminance within the maximum luminance range indicated by the maximum luminance information. As an example, consider a case where the luminance range of input HDR video data is 0 to 900 cd / m ² and the maximum luminance that can be displayed by the display unit 22 is 800 cd / m ² . In this case, the second luminance adjustment unit 224 converts the luminance value for each pixel of the input HDR video data into luminance using EOTF, and calculates the luminance after conversion by multiplying the converted luminance by a certain conversion rate. To do. Then, the second luminance adjustment unit 224 converts the luminance calculated for each pixel into a luminance value using OETF. The conversion rate is given by normalizing the maximum luminance indicated by the maximum luminance information with the second maximum luminance indicated by the conversion information. The second luminance adjustment unit 224 generates a conversion table generated by associating luminance values before and after conversion in the same manner as the first luminance adjustment unit 223, and converts the luminance value using the generated conversion table. Good.

  Thus, according to the second luminance adjustment unit 224, the maximum luminance of the converted video becomes the maximum luminance that can be displayed by the display unit 22, and therefore the performance of the display unit 22 is utilized. In addition, since the luminance is converted using a constant conversion rate, the luminance gradation converted by the first luminance adjusting unit 223 is maintained. When the maximum brightness indicated by the maximum brightness information is equal to the second maximum brightness indicated by the conversion information, the second brightness adjustment unit 224 does not have to perform the process related to the brightness conversion. In addition, in the conversion process, the second luminance adjustment unit 224 gives higher luminance than the maximum luminance indicated by the maximum luminance information among the luminance values for each pixel indicated by the HDR video data input from the first luminance adjustment unit 223. The luminance value of the pixel may be set to a luminance value that gives the maximum luminance (clipping). In the HDR video indicated by the input HDR video data, when the portion of the luminance exceeding the maximum luminance is small, the same video gradation as before conversion is expressed without converting the entire luminance value.

(Modification)
Next, a modification of this embodiment will be described. In this modification, the first communication device 30 may store conversion information for each receiver information. The receiver information is information indicating the operation mode of the receiving device 20. The operation mode includes a normal mode that is a normal operation mode and a low luminance mode in which the luminance of the video is lower than that of the normal mode. Since the low luminance mode consumes less power than the normal mode, it may be called an energy saving mode. FIG. 11A shows an example of receiver information indicating the normal mode. In the example shown in FIG. 11A, the maximum luminance and the energy saving setting are set to 900 cd / m ² and OFF, respectively. FIG. 11B illustrates an example of receiver information indicating the low luminance mode. In the example shown in FIG. 11B, the maximum luminance and the energy saving setting are 300 cd / m ² and ON.

  When receiving the conversion information request signal from the application control unit 243 of the reception device 20, the first communication device 30 transmits conversion information for each receiver information to the reception device 20. The application control unit 243 of the receiving device 20 receives the conversion information for each receiver information from the first communication device 30. The received receiver information indicates the normal mode or the low luminance mode as the operation mode. When the operation signal from the input unit 215 indicates the low luminance mode, the application execution unit 244 outputs conversion information related to the low luminance mode to the first luminance adjustment unit 223. In this case, conversion information related to the low luminance mode is used for the conversion process. The application execution unit 244 outputs conversion information related to the normal mode to the first luminance adjustment unit 223 when the operation signal from the input unit 215 indicates the release of the normal mode or the low luminance mode. In this case, the conversion information related to the normal mode is used for the conversion process. When the conversion information related to the low luminance mode is used for the conversion process, the second luminance adjustment unit 224 stops the process related to the luminance conversion and outputs the input video data to the display unit 22 as it is. .

Next, an example of conversion information according to the low luminance mode of this modification will be described. FIG. 16A shows an example of conversion information related to the low luminance mode. Parameter 1 and parameter 2 are (80, 80) and (100, 200), respectively. The conversion characteristics indicated by this conversion information are shown in FIG. FIG. 16C shows the luminance range before and after conversion. The conversion information related to the normal mode corresponding to this conversion information is the conversion information shown in FIG. The second maximum luminance indicated by the conversion information related to the low luminance mode is lower than the second maximum luminance indicated by the conversion information related to the normal mode. Second maximum luminance conversion information shown in FIG. 16 (A) is 200 cd / ^{m 2,} which is half of 400 cd / ^{m 2} of the second maximum luminance conversion information shown in FIG. 14 (B). In the conversion information shown in FIG. 16A, since the conversion information shown in FIG. 14B and parameter 1 are common, the second low luminance range is common regardless of the operation mode. In this example, since the ratio of the second low luminance range that is not affected by the mode change in the entire luminance range is relatively large, the influence on the image quality due to the change from the normal mode to the low luminance mode is relatively small. is there. Note that the conversion information parameter 1 may be different between the normal mode and the low luminance mode. The conversion information is arbitrarily set for the low luminance mode in which the luminance range is limited as compared with the normal mode according to the luminance distribution of the video to be broadcast by the broadcaster or the video producer.

  Note that some reception devices 20 include a luminance control mechanism (not shown) that reduces the luminance of an image without adjusting the luminance value as a low luminance mode unique to the reception device 20. For example, the brightness control mechanism has a function of reducing the power supplied to the light emitting unit (for example, backlight) included in the display unit 22 as compared with the normal mode. In the receiving device 20 including the brightness control mechanism, when an operation signal indicating the low brightness mode is input from the input unit 215, the application execution unit 244 may cause the display unit 22 to display a confirmation screen. When the operation signal input from the input unit 215 indicates a low-luminance mode specific to the receiving device 20, the application execution unit 244 causes the luminance control mechanism to reduce the luminance of the video from that in the normal mode. When the operation signal input from the input unit 215 indicates the low luminance mode based on the conversion information for each program, the application execution unit 244 uses the conversion information related to the low luminance mode to the first luminance adjustment unit 223 for luminance. Let the conversion process.

  FIG. 17 is a diagram illustrating an example of a confirmation screen according to the present modification. The confirmation screen includes a message, a “content setting” button, and a “television setting” button. When displaying the confirmation screen, the application execution unit 244 reads the confirmation screen data indicating the confirmation screen from the storage unit 250 and outputs the read confirmation screen data to the display processing unit 222. The message “Which energy saving mode should be used?” Illustrated in FIG. 17 prompts the user to select one of the low luminance modes. The “content setting” button is a button for selecting a low luminance mode based on conversion information for each program when pressed. When the “content setting” button is pressed, the application execution unit 244 outputs the conversion information related to the low luminance mode to the first luminance adjustment unit 223, and stops the luminance conversion processing in the second luminance adjustment unit 224. When the “TV setting” button is pressed, the application execution unit 244 causes the luminance control mechanism to lower the luminance of the video image compared to the luminance in the normal mode. Here, “pressing” means that an operation signal indicating a position in the display area is input from the input unit 215 as an operation signal generated by a user operation.

  Next, another modification of the present embodiment will be described. In the present modification, the first communication device 30 may store a plurality of types of conversion information each having a different second maximum luminance for each program. The application control unit 243 of the receiving device 20 acquires conversion information indicating the second maximum luminance corresponding to the maximum luminance that can be displayed as the performance of the display unit 22 from the first communication device 30. The second maximum brightness corresponding to the maximum displayable brightness is not limited to the second maximum brightness that exactly matches the maximum brightness, and includes brightness within a predetermined range from the maximum brightness. The application control unit 243 outputs the acquired conversion information to the first luminance adjustment unit 223.

When acquiring the conversion information, for example, the application control unit 243 obtains the maximum luminance that can be displayed by the display unit 22 from a plurality of types of conversion information received from the first communication device 30 as a response to the transmitted conversion information request signal. Conversion information indicating the corresponding second maximum luminance is selected.
In addition, the application control unit 243 may include displayable maximum luminance information indicating the maximum luminance that can be displayed by the display unit 22 in the conversion information request signal and transmit it to the first communication device 30. The first communication device 30 selects conversion information that matches the maximum luminance indicated by the displayable maximum luminance information included in the conversion information request signal received from the receiving device 20 or indicates the second maximum luminance within a predetermined range. Then, the first communication device 30 transmits the selected conversion information to the receiving device 20. The application control unit 243 of the receiving device 20 receives the conversion information from the first communication device 30.

Next, an example of a plurality of pieces of conversion information stored in the first communication device 30 in this modification will be described. FIG. 18A shows an example of conversion information according to this modification. The conversion information illustrated in FIG. 18A is associated with 900 cd / m ² as the maximum luminance. The first parameter and the second parameter are (60, 60) and (100, 900), respectively. The conversion characteristics indicated by the conversion information are shown in FIG. 18B, and the luminance range before and after conversion is shown in FIG.
FIG. 19A shows another example of conversion information according to this modification. The conversion information illustrated in FIG. 19A is associated with 600 cd / m ² as the maximum luminance. The first parameter and the second parameter are (60, 60) and (100, 600), respectively. The conversion characteristics indicated by this conversion information are shown in FIG. 19B, and the luminance range before and after conversion is shown in FIG. 19C.
As an example, when the maximum luminance that can be displayed by the display unit 22 is 900 cd / m ² , the application control unit 243 has the second maximum luminance that matches the maximum luminance, and the conversion information illustrated in FIG. Select. The first luminance adjustment unit 223 performs luminance conversion processing using the conversion information selected by the application control unit 243.
In the present modification, the second communication device 40 and the second luminance adjustment unit 224 of the reception device 20 may be omitted. Moreover, the process in which the application control part 243 acquires maximum brightness information may be omitted.

As described above, the receiving device 20 according to the present embodiment has presence / absence of conversion information used for conversion from the luminance of the SDR video of the program to the luminance of the HDR video based on the service information related to the service of the program received by broadcasting. The application control unit 243 that acquires the conversion information from the first communication device 30 that is the acquisition destination indicated by the control information related to service control is provided. In addition, a first luminance adjustment unit 223 that converts the luminance of the SDR video into the luminance of HDR based on the conversion information is provided. The conversion information indicates a parameter 1 indicating a correspondence relationship between the first boundary luminance and the second boundary luminance, and a parameter 2 indicating a correspondence relationship between the maximum SDR luminance and the maximum HDR luminance. The first boundary luminance is a boundary between a first low luminance range that is a luminance range having a lower SDR and a first high luminance range that is a higher luminance range, and the second boundary luminance is a luminance range having a lower HDR. And a second high luminance range that is a higher luminance range of HDR.
With this configuration, an HDR video is generated in which the luminance of the received SDR video is independent between the first low luminance range and the first high luminance range and is expanded at an expansion rate given for each program. Therefore, the burden on the broadcaster when broadcasting SDR video and HDR video having different luminance ranges is reduced. In addition, by acquiring the conversion information from the first communication device 30 by communication, it is possible to differentiate the broadcast service from the case where the communication function is not used.

The control information includes model-specific acquisition destination information indicating a model-specific acquisition destination, and the application control unit 243 acquires the acquisition destination indicated by the model-specific acquisition destination information corresponding to the model of the display unit 22 that displays the video of the program. From the second communication device 40, the maximum luminance information indicating the maximum luminance for displaying the video on the display unit 22 is acquired by communication. Further, the second luminance adjustment unit 224 converts the HDR luminance converted by the first luminance adjustment unit 223 into luminance within the maximum luminance range indicated by the maximum luminance information acquired by the service information processing unit 242.
With this configuration, the maximum luminance information corresponding to the model of the display unit 22 is acquired from the second communication device 40 by communication, and the first luminance adjustment unit 223 is set to the luminance within the range of the maximum luminance indicated by the acquired maximum luminance information. The brightness of the HDR video converted in step is adjusted. By setting the maximum luminance indicated by the maximum luminance information to the maximum luminance that is equal to or lower than the maximum luminance that can be displayed by the display unit 22, the luminance of the HDR video is adjusted within the luminance range that can be displayed by the display unit 22. In addition, since the model-specific acquisition destination information of the maximum luminance information is specified independently of the conversion information acquisition destination, the manufacturer, distributor, or maintenance manager of the display unit 22 is unaware of the broadcast program. The maximum brightness information can be easily managed.

In addition, the application control unit 243 acquires conversion information from the first communication device 30 in which the maximum luminance in the second luminance range corresponds to the maximum luminance that can be displayed by the display unit 22 that displays the program video.
With this configuration, the brightness of the HDR video is limited within the range of the maximum brightness that can be displayed by the display unit 22. For this reason, the brightness of the HDR video generated according to the brightness range that can be displayed by the display unit 22 is adjusted. According to this configuration, since the second brightness adjustment unit 224 and the second communication device 40 can be omitted, the burden on the manufacturer, distributor, or maintenance manager of the display unit 22 is reduced.

In addition, the application control unit 243 acquires conversion information for the low luminance mode related to luminance lower than the standard. When the low luminance mode is instructed as the operation mode based on the operation signal, the first luminance adjusting unit 223 converts the luminance of the SDR video into the luminance within the second luminance range indicated by the conversion information for the low luminance mode. The maximum HDR brightness indicated by the low brightness mode conversion information is lower than the HDR maximum brightness indicated by the standard mode conversion information.
With this configuration, when the low luminance mode is instructed by an operation, an HDR video having a luminance within the range of the maximum luminance that is lower than the standard mode is generated. As the generated HDR video, even in the low luminance mode, a video having a luminance distribution based on conversion information set by the broadcaster or video producer according to the program is enjoyed.

The application execution unit 244 causes the display unit 22 to display a confirmation screen indicating the low luminance mode related to the conversion information and the low luminance mode unique to the receiving device 20. In addition, when the low luminance mode specific to the receiving device 20 is instructed, the application execution unit 244 reduces the luminance of the video from the standard luminance based on the low luminance mode.
With this configuration, either the low luminance mode related to the conversion information acquired from the first communication device 30 by the operation or the low luminance mode unique to the receiving device 20 is selected. Therefore, when viewing the video in the low luminance mode, the user arbitrarily selects and selects the low luminance mode based on the conversion information set by the broadcaster or the video producer and the low luminance mode unique to the receiving device 20. In addition, it is possible to enjoy an image with reduced brightness based on the low brightness mode.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above-described embodiment, and includes a design and the like within a scope not departing from the gist of the present invention. Each structure demonstrated in the above-mentioned embodiment can be combined arbitrarily. For example, the above-described one modification and another modification may be combined. In addition, if the acquisition destination of the conversion information and the acquisition destination indicated by the model-specific acquisition destination information that is the acquisition destination of the maximum luminance information are independent, the first communication device 30 and the second communication device 40 are separate from each other. Alternatively, it may be configured as an integrated single communication device.

In the above-described embodiment, the case where the video component descriptor is described in the descriptor area of the MH-EIT is taken as an example. However, the video component descriptor may be described in the asset descriptor area of the video of MPT. Good.
Moreover, although the case where the application control information stored in MH-AIT which comprises some MMT-SI was used as application control information was demonstrated to the example, it is not restricted to this. Application control information stored in a device connected to the network NW, for example, the first communication device 30 may be used. In that case, the location of the application control information in the device is described in the AIT location information of the application service descriptor. The service information processing unit 242 transmits an application control information request signal to the location indicated by the AIT location information, and receives the application control information as a response. Further, as the application control information, an XML format AIT described using XML (Extensible Markup Language) as a description language may be used.

  In the above-described embodiment, the example in which the MMT method is mainly used as the media transport method of the broadcast signal from the transmission device 10 to the reception device 20 has been described. However, the present invention is not limited to this. The broadcasting / communication cooperation system 1 may use, for example, the MPEG-2 TS system, the RTP (Real-time Transport Protocol) system, or the like.

The invention described above can also be implemented in the following manner.
(1) It is determined that there is conversion information used for converting the luminance of the video of the program into luminance within a second luminance range wider than a predetermined first luminance range based on service information related to the service of the program received by broadcasting. A service information processing unit that acquires the conversion information by communication from an acquisition destination indicated by the control information related to the control of the service, and converts the luminance of the video to a luminance within the second luminance range based on the conversion information The conversion information includes a first parameter indicating a correspondence relationship between the first boundary luminance and the second boundary luminance, a maximum luminance of the first luminance range, and a maximum of the second luminance range. A second parameter indicating a correspondence relationship with the luminance, wherein the first boundary luminance is a first low luminance range that is a lower luminance range of the first luminance range and a first high luminance that is a higher luminance range. With range A boundary, the second boundary luminance, a second low luminance range is lower luminance range of the second luminance range, the receiving apparatus is a boundary between the second high-luminance range is higher luminance range.

(2) The control information includes model-specific acquisition destination information indicating a model-specific acquisition destination, and the service information processing unit includes model-specific acquisition destination information corresponding to a model of a display unit that displays the video of the program. The maximum luminance information indicating the maximum luminance for displaying the video on the display unit is acquired by communication from the acquisition source indicated, and the luminance adjustment unit acquires the luminance within the second luminance range by the service information processing unit. The receiving apparatus according to (1), wherein the receiving device converts the luminance into a luminance within a maximum luminance range indicated by the maximum luminance information.

(3) The receiving device according to (1), wherein the service information processing unit acquires the conversion information in which the maximum luminance of the second luminance range corresponds to the maximum luminance that can be displayed by a display unit that displays the video of the program .

(4) The service information processing unit acquires the conversion information for the low luminance mode related to luminance lower than the standard, and the luminance adjustment unit is configured to display the video when the low luminance mode is instructed as an operation mode. The luminance is converted into the luminance within the second luminance range indicated by the conversion information for the low luminance mode, and the maximum luminance of the second luminance range indicated by the conversion information for the low luminance mode is the standard conversion information. The receiving device according to any one of (1) to (3), which is lower than the maximum luminance in the second luminance range shown.

(5) The service information processing unit causes the display unit to display a confirmation screen indicating the low luminance mode and the low luminance mode specific to the own device, and when the low luminance mode specific to the own device is instructed, (4) The receiving device according to (4), wherein the luminance of the video is lowered from a standard luminance based on a specific low luminance mode.

(6) A broadcasting / communication cooperation system including a transmission device, a reception device, and a communication device, wherein the transmission device broadcasts a program, service information related to the service of the program, and control information related to control of the service, and When the receiving device has conversion information used for converting the luminance of the video of the program to a luminance within a second luminance range wider than a predetermined first luminance range based on service information received by broadcasting from the transmitting device. When determining, a service information processing unit that acquires the conversion information from the communication device that is an acquisition destination indicated by the control information, and a luminance within the second luminance range based on the conversion information A luminance adjustment unit that converts the luminance information into a first parameter indicating a correspondence relationship between the first boundary luminance and the second boundary luminance, and a maximum of the first luminance range. A second parameter indicating a correspondence relationship between the degree of brightness and the maximum brightness of the second brightness range, and the first boundary brightness is a lower brightness range of the first brightness range, The second boundary luminance is a boundary with a first high luminance range that is a high luminance range, and the second boundary luminance is a second low luminance range that is a lower luminance range of the second luminance range and a second luminance range that is a higher luminance range. A broadcasting / communication system that is the boundary with the high luminance range.

(7) Provided with a second communication device, the control information includes model-specific acquisition destination information indicating a model-specific acquisition destination, and the service information processing unit is a model of a display unit that displays the video of the program The maximum brightness information indicating the maximum brightness for displaying the video on the display unit is acquired by communication from the second communication device that is the acquisition destination indicated by the corresponding model-specific acquisition destination information, and the brightness adjustment unit is configured to receive the second brightness information. The broadcasting / communication cooperation system according to (6), wherein luminance within a luminance range is converted into luminance within a maximum luminance range indicated by maximum luminance information acquired by the service information processing unit.

  In addition, the program for realizing the functions of the transmission device 10, the reception device 20, the first communication device 30, and the second communication device 40 described above is recorded on a computer-readable recording medium and recorded on the recording medium. You may implement | achieve the transmitter 10, the receiver 20, the 1st communication apparatus 30, and the 2nd communication apparatus 40 by making a computer system read and run a program. The program is a separate program from the application program described above, but a part of the functions may be realized based on the application program. Here, “loading and executing a program recorded on a recording medium into a computer system” includes installing the program in the computer system. The “computer system” here includes an OS and hardware such as peripheral devices. Further, the “computer system” may include a plurality of computer devices connected via a network including a communication line such as the Internet, WAN, LAN, and dedicated line.

The “computer-readable recording medium” refers to a storage device such as a portable medium such as a flexible disk, a magneto-optical disk, a DVD-ROM, a CD-ROM, or a hard disk built in the computer system. As described above, the recording medium storing the program may be a non-transitory recording medium such as a DVD-ROM or a CD-ROM. The recording medium also includes a recording medium provided inside or outside that is accessible from the distribution server in order to distribute the program. The code of the program stored in the recording medium of the distribution server may be different from the code of the program that can be executed by the terminal device. That is, the format stored in the distribution server is not limited as long as it can be downloaded from the distribution server and installed in a form that can be executed by the terminal device.

  Note that the program may be divided into a plurality of parts, downloaded at different timings, and then integrated in the terminal device, or the distribution server that distributes each of the divided programs may be different. Furthermore, the “computer-readable recording medium” holds a program for a certain period of time, such as a volatile memory (RAM) inside a computer system that becomes a server or a client when the program is transmitted via a network. Including things. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Broadcast communication cooperation system, 10 ... Transmission apparatus, 110 ... Service information acquisition part, 120 ... Video encoding part, 130 ... Audio | voice encoding part, 140 ... Control information acquisition part, 150 ... Multiplexing part, 160 ... Encryption 170, transmitting unit, 20 ... receiving device, 22 ... display unit, 23 ... loudening unit, 211 ... tuner, 212 ... reception processing unit, 213 ... decoding unit, 214 ... separation unit, 215 ... input unit, 221 ... video Decoding unit 222 ... Display processing unit 223 ... First luminance adjustment unit 224 ... Second luminance adjustment unit 231 ... Audio decoding unit 240 ... Control unit 241 ... Channel selection unit 242 ... Service information processing unit 243 ... Application control unit, 244 ... application execution unit, 250 ... storage unit, 260 ... communication unit, 30 ... first communication device, 40 ... second communication device, BT ... broadcast transmission path, BS ... broadcast satellite, NW ... Network, RC ... control device

Claims (7)

When it is determined that there is conversion information used for converting the luminance of the video of the program to the luminance within the second luminance range wider than the predetermined first luminance range based on the service information regarding the service of the program received by broadcasting. A service information processing unit for acquiring the conversion information by communication from an acquisition destination indicated by control information related to control of the service;
A luminance adjustment unit that converts the luminance of the video into luminance within the second luminance range based on the conversion information, wherein the conversion information indicates a correspondence relationship between the first boundary luminance and the second boundary luminance. 1 parameter and a second parameter indicating a correspondence relationship between the maximum brightness of the first brightness range and the maximum brightness of the second brightness range;
The first boundary luminance is a boundary between a first low luminance range that is a lower luminance range of the first luminance range and a first high luminance range that is a higher luminance range, and the second boundary luminance is: The receiving device, which is a boundary between a second low-luminance range that is a lower luminance range of the second luminance range and a second high-luminance range that is a higher luminance range. The control information includes model-specific acquisition destination information indicating a model-specific acquisition destination,
The service information processing unit communicates maximum luminance information indicating maximum luminance for displaying the video on the display unit from an acquisition destination indicated by model-specific acquisition destination information corresponding to a model of a display unit that displays the video of the program. Acquired,
The receiving device according to claim 1, wherein the luminance adjustment unit converts luminance within the second luminance range into luminance within a maximum luminance range indicated by maximum luminance information acquired by the service information processing unit. The receiving apparatus according to claim 1, wherein the service information processing unit acquires the conversion information in which the maximum luminance in the second luminance range corresponds to the maximum luminance that can be displayed by a display unit that displays the video of the program. The service information processing unit obtains the conversion information for a low luminance mode related to luminance lower than a standard,
The luminance adjusting unit converts the luminance of the video to a luminance within a second luminance range indicated by the conversion information for the low luminance mode when a low luminance mode is instructed as an operation mode,
4. The maximum luminance of the second luminance range indicated by the conversion information for the low luminance mode is lower than the maximum luminance of the second luminance range indicated by the standard conversion information. 5. The receiving device described. The service information processing unit causes the display unit to display a confirmation screen indicating the low luminance mode and the low luminance mode unique to the device itself,
The receiving device according to claim 4, wherein when the low-luminance mode specific to the own device is instructed, the luminance of the video is lowered from the standard luminance based on the low-luminance mode specific to the own device. A broadcast communication cooperation system comprising a transmission device, a reception device and a communication device,
The transmitter transmits a program, service information related to the service of the program, and control information related to control of the service by broadcasting,
The receiving device is:
When it is determined that there is conversion information used for converting the luminance of the video of the program to a luminance within a second luminance range wider than a predetermined first luminance range based on service information received by broadcasting from the transmission device. A service information processing unit that acquires the conversion information by communication from the communication device that is the acquisition destination indicated by the control information;
A luminance adjustment unit that converts the luminance of the video into luminance within the second luminance range based on the conversion information, wherein the conversion information indicates a correspondence relationship between the first boundary luminance and the second boundary luminance. 1 parameter and a second parameter indicating a correspondence relationship between the maximum brightness of the first brightness range and the maximum brightness of the second brightness range;
The first boundary luminance is a boundary between a first low luminance range that is a lower luminance range of the first luminance range and a first high luminance range that is a higher luminance range, and the second boundary luminance is: A broadcasting / communication cooperation system, which is a boundary between a second low luminance range that is a lower luminance range of the second luminance range and a second high luminance range that is a higher luminance range. A second communication device,
The control information includes model-specific acquisition destination information indicating a model-specific acquisition destination,
The service information processing unit has a maximum luminance for displaying the video on the display unit from a second communication device that is an acquisition destination indicated by model-specific acquisition source information corresponding to a model of a display unit that displays the video of the program. To obtain the maximum brightness information
The broadcasting / communication cooperation system according to claim 6, wherein the luminance adjustment unit converts luminance within the second luminance range into luminance within a maximum luminance range indicated by maximum luminance information acquired by the service information processing unit.