WO2018003667A1 - Transmitting device, receiving device, and display device - Google Patents

Transmitting device, receiving device, and display device Download PDF

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Publication number
WO2018003667A1
WO2018003667A1 PCT/JP2017/023097 JP2017023097W WO2018003667A1 WO 2018003667 A1 WO2018003667 A1 WO 2018003667A1 JP 2017023097 W JP2017023097 W JP 2017023097W WO 2018003667 A1 WO2018003667 A1 WO 2018003667A1
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WIPO (PCT)
Prior art keywords
tone mapping
unit
parameter
transmission
receiving
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PCT/JP2017/023097
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French (fr)
Japanese (ja)
Inventor
涼二 櫻井
鈴木　秀樹
智夫 西垣
吉山　和良
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シャープ株式会社
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Publication of WO2018003667A1 publication Critical patent/WO2018003667A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/84—Generation or processing of descriptive data, e.g. content descriptors

Definitions

  • the present invention relates to a transmission device that transmits a video signal, a reception device that receives a video signal from the transmission device, and a display device.
  • HDR High Dynamic Range
  • HLG Hybrid log gamma
  • Standards of the HLG system include standard number: ARIB STD-B67, standard name: Essential parameter values for the extended image dynamic range television (EIDRTV) system for programme production.
  • EIDRTV extended image dynamic range television
  • This is a colorimetric parameter, signal format, and digital parameters that are indispensable when converting light information into electrical information among the system parameters of the extended video dynamic range television system (EIDRTV). It is intended to prescribe the signal expression and to facilitate the program production by the HLG method.
  • the HLG system is a hybrid system that employs a conventional gamma curve in the dark portion and a log curve in the bright portion, and is highly compatible with a conventional television because the conversion is based on the relative value to “reference white”.
  • the HLG system defines the characteristics of OETF (correspondence between luminance value and gradation value in HDR signal) on the camera side, and displays a video image of a raw video signal captured by the camera like broadcasting. Suitable for cases that must be delivered to.
  • the receiving device that receives the video signal from the camera side converts the gradation value of the received video signal into a luminance value by tone mapping.
  • a function is used for tone mapping, and this function should be determined according to the video expression that the video signal transmitting side wants to display on the receiving device. In other words, the tone mapping applied to the video signal by the receiving device should reflect the intention of the video signal transmitting side.
  • Patent Literature 1 discloses a technique in which a transmitting device transmits image quality adjustment information corresponding to a video signal transmitted from the transmitting device to the receiving device. Has been.
  • Japanese Patent Publication Japanese Patent Laid-Open No. 2010-246057 (released on October 28, 2010)”
  • Patent Document 1 A technique for transmitting image quality adjustment information disclosed in Patent Document 1 from a transmission apparatus to a reception apparatus is known, but information defining a function used for tone mapping is received from the transmission apparatus. There is no specific mechanism for transmitting to the device.
  • the tone mapping applied to the video signal in the receiving apparatus does not reflect the intention of the video data transmitting side, there is a problem that a video different from the intention of the video signal transmitting side is expressed. .
  • the present invention has been made in view of the above problems, and an object of the present invention is to realize that tone mapping that reflects the intention of the video signal transmitting side is applied to the video signal in the receiving device. There is.
  • a transmission device is a transmission device that transmits image data to a reception device, and a plurality of transmission devices used for tone mapping performed on the image data in the reception device.
  • a determining unit that determines a parameter set including the parameters, and a transmitting unit that transmits the parameters to the receiving device.
  • a receiving apparatus is a receiving apparatus that receives image data from a transmitting apparatus, and that receives a parameter set including a plurality of parameters used for tone mapping applied to the image data. And an image processing unit that performs tone mapping on the image data using the parameter set.
  • tone mapping that reflects the intention of the video signal transmitting side can be applied to the video signal in the receiving device.
  • Embodiment 1 Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
  • FIG. 1 is a functional block diagram showing an outline of a transmission / reception system 1 according to the present embodiment.
  • the transmission / reception system 1 includes a camera 10, a transmission device 20, and a reception device 30.
  • the camera 10 images a subject and outputs a video signal to the transmission device 20.
  • the transmission apparatus 20 includes an image processing unit 22, an encoder 24, a meta information determination unit 26, and a transmission unit 28.
  • the image processing unit 22 acquires a video signal from the camera 10 and converts the video signal into a gradation signal using an OETF (Opto-Electronic Transfer Function) that is a correspondence relationship between a luminance value and a gradation value in the HDR signal.
  • OETF Opto-Electronic Transfer Function
  • E is the luminance value of the video signal normalized at the reference white level.
  • a 0.78883277
  • b 0.28466892
  • c 0.59959973.
  • the encoder 24 acquires the gradation signal obtained by the conversion by the image processing unit 22, and encodes the acquired gradation signal.
  • the meta information determination unit 26 determines a parameter set including parameters a, b, c, l, m, and n as meta information of the HLG broadcast wave.
  • the video signal transmitting side transmits an OETF ⁇ 1 (Inverse of Opto-Electronic Transfer Function) expressed by the following formula (2) according to the video expression to be displayed on the display unit 40 of the receiving device 30, and the following formula ( The OOTF (Opto-Optical Transfer Function) represented by 3) is determined.
  • the parameters a and c are related to the index of OETF ⁇ 1 represented by the following formula (2).
  • the parameter b defines an OETF -1 intercept expressed by the following equation (2).
  • the parameter l defines the intercept of the parameter ⁇ expressed by the following equation (4) of this OOTF.
  • the parameter m defines a logarithmic proportionality factor included in the parameter ⁇ .
  • the parameter n is related to the logarithm of the true number included in the parameter ⁇ .
  • F D is the luminance value of the image to be displayed.
  • Y s appearing in formula (3) is represented by the following formula (5).
  • ⁇ appearing in the formula (3) is represented by the following formula (6).
  • ⁇ appearing in the formula (3) is represented by the following formula (7).
  • Lw appearing in Equation (4) is an eigenvalue that the display unit 40 of the receiving device 30 has, and is a maximum luminance parameter that the display unit 40 has.
  • the transmission unit 28 transmits a transmission signal including the gradation signal encoded by the encoder 24 and the meta information determined by the meta information determination unit 26 to the reception device 30.
  • the receiving device 30 includes a receiving unit 32, a decoder 34, an image processing unit 36, a display control unit 38, and a display unit 40.
  • FIG. 2 is a front view showing the appearance of the receiving device 30.
  • the reception unit 32 receives a transmission signal including the gradation signal and meta information transmitted by the transmission unit 28 of the transmission device 20.
  • the decoder 34 decodes the encoded gradation signal.
  • the image processing unit 36 converts the gradation signal using OETF ⁇ 1 and OOTF to calculate a luminance value. This conversion is also called tone mapping.
  • a, b, and c that define OETF ⁇ 1 are determined by the meta information determination unit 26 of the transmission device 20.
  • the parameter ⁇ that defines OOTF is defined by parameters l, m, and n determined by the meta information determination unit 26 of the transmission device 20.
  • the luminance values in the display units 40 of the three primary colors are expressed by the following equations (8) to (10).
  • the display control unit 38 controls the display unit 40 so that an image corresponding to the luminance value obtained by applying tone mapping is displayed.
  • the receiving device 20 may be a television receiver, and the display unit 40 may be a display of the television receiver.
  • the video display unit 40 is included in the receiving device 30, but the mechanism for displaying the video may be an external device of the receiving device 30.
  • the camera 10 is an external device of the transmission device 20, but the camera 10 may be included in the transmission device 20.
  • step S ⁇ b> 10 the image processing unit 22 acquires a video signal from the camera 10.
  • step S12 the image processing unit 22 performs image processing using OETF on the video signal.
  • step S14 the encoder 24 encodes the gradation signal subjected to the image processing by the image processing unit 22.
  • the meta information determination unit 26 determines parameters l, m, and n that define the parameters a, b, and c of OOTF- 1 and the parameter ⁇ of OOTF.
  • the meta information determination unit 26 may determine meta information according to an input operation to the transmission device 20 by an operator on the video data transmission side, or may determine according to the luminance value of the video signal. .
  • step S18 the transmission unit 28 transmits the gradation signal encoded by the encoder 24 and the meta information determined by the meta information determination unit 26 to the reception device 30.
  • HDMI registered trademark
  • the HDMI connection means a wired or wireless connection capable of transmitting each signal such as TMDS (Transition Minimized Differential Signaling) and CEC (Consumer Electronics Control) compliant with the HDMI standard.
  • Fig. 4 shows a table of dynamic range and Mastering InfoFrame.
  • the meta information is transmitted from the transmission device 20 to the reception device 30 as a dynamic range and Mastering InfoFrame.
  • FIG. 5 shows a table indicating the structure used in the third and subsequent Data bytes.
  • FIG. 6 shows a table of meta information used in this embodiment.
  • the meta information determination unit 26 defines Metadata Descriptor as “Static metadata Type2” when Static_Metadata_Descriptor_ID is “1”. That is, the meta information determination unit 26 generates the table shown in FIG.
  • FIG. 7 is a table showing a specific correspondence between the third and subsequent Data bytes and parameters. This table is defined by the metadata information determining unit 26 defining Metadata Descriptor as “Static metadata Type2” when Static_Metadata_Descriptor_ID is “1”. That is, the meta information determination unit 26 generates the table shown in FIG.
  • Group 1 in Fig. 7 is expressed in half-precision floating point (2-byte code). That is, the OOTF parameters l, m, and n are expressed by two Data Bytes. Note that “LSB” is an abbreviation for leastificsignificant byte (the least significant byte) and represents the latter half of each parameter. “MSB” is an abbreviation of “most significant byte” and represents the first half of each parameter. When all of the parameters l, m, and n are 0, or when the corresponding Metadata_Descriptor is not transmitted or when the corresponding Metadata_Descriptor does not exist, the meta information determination unit 26 determines the parameter ⁇ to be a fixed value of 1.2.
  • the transmitting unit 28 when the corresponding Metadata_Descriptor is not transmitted or when the corresponding Metadata_Descriptor does not exist, the transmitting unit 28 does not have to transmit the meta information.
  • Group2 in FIG. 7 is expressed by a single precision floating point (4 byte code). That is, the parameters a, b, and c of OETF- 1 are expressed by four Data Bytes.
  • FIGS. 8 to 9 show examples of tables used when meta information is transmitted from the transmission device 20 to the reception device 30 by broadcast waves.
  • the meta information determination unit 26 generates a video component descriptor Video_Component_Descriptor including video_EOTF_param_g1 and video_EOTF_param_g2.
  • the transmission unit 28 transmits the video component descriptor Video_Component_Descriptor to the reception device 30.
  • the transmission unit 28 transmits Video_Component_Descriptor by including it in an MPT (MMT Package Table) stored in the PA message of the MMT-SI message.
  • MPT MMT Package Table
  • FIG. 9 is a table showing a specific correspondence between each DataByte included in video_EOTF_param_g1 or video_EOTF_param_g12 and parameters l, m, n, a, b, and c.
  • video_EOTF_param_g1 is expressed in half precision floating point (2 byte code). That is, the OOFT parameters l, m, and n are expressed by two Data ⁇ 2Bytes.
  • the meta information determination unit 26 determines the parameter ⁇ to be a fixed value of 1.2. That is, in the present embodiment, when the corresponding Metadata_Descriptor is not transmitted or when the corresponding Metadata_Descriptor does not exist, the transmitting unit 28 does not have to transmit the meta information.
  • video_EOTF_param_g2 is expressed in single precision floating point (4 byte code). That is, the parameters a, b, and c of OETF- 1 are expressed by four Data Bytes.
  • the metadata information determining unit 26 is defined in the HLG standard.
  • step S20 the reception unit 32 receives the gradation signal and meta information transmitted by the transmission device 20.
  • step S22 the decoder 34 decodes the encoded gradation signal.
  • step S ⁇ b> 24 the image processing unit 36 calculates the parameter ⁇ from the parameters l, m, n and the eigenvalue Lw that the display unit 40 has. Since the image processing unit 36 calculates the parameter ⁇ using the eigenvalue Lw of the display unit 40, an image suitable for the characteristics of the display unit 40 can be obtained. Then, the image processing unit 36 performs tone mapping on the gradation signal using OETF ⁇ 1 and OOTF, and the luminance value that can realize the video expression that the video signal transmitting side wants to display on the display unit 40 of the receiving device 30. Get.
  • step S26 the display control unit 38 controls the display unit 40 to display an image corresponding to the luminance value.
  • FIG. 11 is obtained by converting the gradation signal (input signal E ′) received from the transmission device 20 processed by the image processing unit 36 and the input signal E ′ using OETF ⁇ 1 and OOTF.
  • the correspondence relationship with the luminance value is shown.
  • This conversion is also called tone mapping, and the correspondence between the gradation value and the luminance value in this conversion is also called a tone curve.
  • the luminance value obtained by performing the conversion is the luminance value of the video displayed on the display unit 40.
  • the brightness in the display unit 40 changes according to the value of the parameter ⁇ .
  • the dark part becomes brighter.
  • all of the parameters l, m, n, a, b, and c are transmitted from the transmission device 20 to the reception device 30, but it is not always necessary to transmit all the parameters. Some parameters may be transmitted. For example, if some of the parameters always have the same value regardless of the video signal, the receiving apparatus 30 may have some parameters that always have the same value. Then, the transmission device 20 only has to transmit to the reception device 30 only parameters whose values change depending on the video signal.
  • the present embodiment is different from the first embodiment in that the reception device 50 further includes a selection unit 52.
  • the receiving device 50 may receive a plurality of parameter sets from the transmitting device 20.
  • the selection unit 52 selects whether to perform tone mapping using any one of the plurality of parameter sets received by the reception unit 32.
  • the selection unit 52 may select a parameter set according to a user input operation.
  • step S30 is included between step S22 and step S24.
  • step S30 the selection unit 52 selects whether to perform tone mapping using any one of a plurality of parameter sets received by the reception unit 32.
  • FIG. 14 shows a table generated by the meta information determination unit 26 in the present embodiment.
  • the table shown in FIG. 14 includes a plurality of parameter sets.
  • Number_of_parameter (hereinafter referred to as n) is arranged in the first byte of data (Data Byte is 3) to indicate the number of parameter sets to be transmitted.
  • Data Byte is 3
  • n 1
  • one set of data is transmitted from Data Byte 4 to Data Byte 21 (if the parameter set to be transmitted is one set, the receiving device does not select the parameter set, and the parameter is unique. Determined.)
  • n ⁇ 2 the first set of parameters expressed by 18 Data Bytes is transmitted after Data Byte4, and the second parameter set is transmitted to Data Bytes 22 to 39. The same applies to the third and subsequent sets.
  • control block especially the image processing unit 22 and the meta information determining unit 26 of the sending device 20 and the control block (particularly the image processing unit 36) of the receiving device 30 are logic circuits (IC chips) or the like formed in an integrated circuit (IC chip) or the like. Hardware) or software using a CPU (Central Processing Unit).
  • CPU Central Processing Unit
  • the transmitting device 20 and the receiving device 30 include a CPU that executes instructions of a program that is software that implements each function, and a ROM (Read that records the above-described program and various data so that the computer (or CPU) can read the program. Only Memory) or a storage device (these are referred to as “recording media”), RAM (Random Access Memory) for expanding the program, and the like. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it.
  • a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used.
  • the program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program.
  • a transmission medium such as a communication network or a broadcast wave
  • the present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.
  • the transmission device 20 is a transmission device 20 that transmits image data to the reception devices 30 and 50, and parameters used for tone mapping performed on the image data in the reception devices 30 and 50.
  • a determining unit metal information determining unit 26 for determining and a transmitting unit 28 for transmitting the parameters to the receiving devices 30 and 50 are provided.
  • tone mapping that reflects the intention of the video signal transmitting side can be applied to the video signal in the receiving devices 30 and 50.
  • the tone mapping may use OOTF, and the determination unit (meta information determination unit 26) may determine the parameter of the OOTF.
  • tone mapping including OOTF can be performed, so that an image corresponding to the image captured by the camera 10 can be displayed.
  • the transmitting apparatus 20 uses OETF -1 for the tone mapping, and the determination unit (meta information determination unit 26) determines the parameter of the OETF -1 May be.
  • tone mapping including OETF -1 can be performed.
  • the receiving devices 30 and 50 are receiving devices 30 and 50 that receive image data from the transmitting device 20, and a receiving unit 32 that receives parameters used for tone mapping applied to the image data. And an image processing unit 36 that performs tone mapping on the image data using the parameters.
  • tone mapping that reflects the intention of the video signal transmitting side can be applied to the video signal in the receiving devices 30 and 50.
  • the reception device 50 further includes the selection unit 52 that selects which one of the plurality of parameters received by the reception unit 32 is to be used for tone mapping in the fourth aspect. Also good.
  • tone mapping in accordance with the reception situation can be applied to the video signal in the receiving device 50.
  • the receiving apparatuses 30 and 50 according to aspect 6 of the present invention may use OOTF as the tone mapping in the aspect 4 or 5, and the parameter may be a parameter of the OOTF.
  • tone mapping including OOTF can be performed, so that an image corresponding to the image captured by the camera 10 can be displayed.
  • the parameter may be a parameter of the OETF -1.
  • tone mapping including OETF -1 can be performed.
  • a display device includes the receiving device according to any one of aspects 4 to 7.
  • Transmission / reception system 20 Transmission device 26 Meta information determination unit (determination unit) 28 Transmitter 30, 50 Receiving device (display device) 32 receiving unit 36 image processing unit 52 selection unit

Abstract

According to the present invention, a receiving device subjects a video signal to tone mapping that reflects the intention of the transmitter of the video signal. A transmitting device (20) which transmits image data to a receiving device (30, 50) is provided with: a meta information determining unit (26) which determines a parameter set including a plurality of parameters used in tone mapping to which the image data is to be subjected by the receiving device (30, 50); and a transmitting unit (28) which transmits the parameters to the receiving device (30, 50).

Description

送信装置、受信装置、および表示装置Transmitting device, receiving device, and display device
　本発明は、映像信号を送信する送信装置、送信装置から映像信号を受信する受信装置、および表示装置に関する。 The present invention relates to a transmission device that transmits a video signal, a reception device that receives a video signal from the transmission device, and a display device.
　近年、高画質化技術の１つとして、従来よりも高輝度の情報を含み、階調数（取り得る階調値の個数）が多いＨＤＲ（High Dynamic Range）信号が注目を集めている。ＨＤＲ信号を用いることより、従来よりも高輝度かつ高コントラストな迫力のある映像を得ることができる。 In recent years, HDR (High Dynamic Range) signals, which contain information with higher luminance than the conventional one and have a larger number of gradations (number of possible gradation values), are attracting attention as one of the techniques for improving image quality. By using the HDR signal, it is possible to obtain a powerful image with higher brightness and higher contrast than before.
　ＨＤＲ信号を用いたＨＤＲ放送の方式として、ＨＬＧ（Hybrid log gamma）方式がある。ＨＬＧ方式の標準規格として、標準規格番号：ARIB STD-B67、標準規格名：Essential parameter values for the extended image dynamic range television(EIDRTV) system for programme productionがある。これは、拡張映像ダイナミックレンジ型テレビジョンシステム（EIDRTV）のシステムパラメータの内、光の情報を電気の情報へ変換し、デジタル化する際に必須となるパラメータである測色パラメータ、信号フォーマット及びデジタル信号表現を規定するものであり、ＨＬＧ方式による番組制作が円滑に実施されることを目的としたものである。ＨＬＧ方式は、暗部に従来のガンマカーブ、明部にログカーブを採用するハイブリッド方式で、「基準白」との相対値により変換をするので従来のテレビとの互換性が高い。ＨＬＧ方式は、カメラ側のＯＥＴＦ（ＨＤＲ信号における輝度値と階調値との対応関係）の特性を規定しており、放送のようにカメラで撮像した生の映像信号を、映像を表示する側に届けなければならない場合に適している。 There is an HLG (Hybrid log gamma) method as a method of HDR broadcasting using an HDR signal. Standards of the HLG system include standard number: ARIB STD-B67, standard name: Essential parameter values for the extended image dynamic range television (EIDRTV) system for programme production. This is a colorimetric parameter, signal format, and digital parameters that are indispensable when converting light information into electrical information among the system parameters of the extended video dynamic range television system (EIDRTV). It is intended to prescribe the signal expression and to facilitate the program production by the HLG method. The HLG system is a hybrid system that employs a conventional gamma curve in the dark portion and a log curve in the bright portion, and is highly compatible with a conventional television because the conversion is based on the relative value to “reference white”. The HLG system defines the characteristics of OETF (correspondence between luminance value and gradation value in HDR signal) on the camera side, and displays a video image of a raw video signal captured by the camera like broadcasting. Suitable for cases that must be delivered to.
　カメラ側から映像信号を受信する受信装置は、受信した映像信号の階調値をトーンマッピングにより輝度値に変換する。トーンマッピングには関数が用いられるが、この関数は、映像信号を送信する側が受信装置で表示させたい映像表現に応じて定められるべきである。すなわち、受信装置で映像信号に施されるトーンマッピングは、映像信号を送信する側の意図が反映されたものであるべきである。 The receiving device that receives the video signal from the camera side converts the gradation value of the received video signal into a luminance value by tone mapping. A function is used for tone mapping, and this function should be determined according to the video expression that the video signal transmitting side wants to display on the receiving device. In other words, the tone mapping applied to the video signal by the receiving device should reflect the intention of the video signal transmitting side.
　映像信号を送信する側の意図を受信装置に送信する一例として、特許文献１には、送信装置が、送信装置から送信される映像信号に対応する画質調整情報を受信装置に送信する技術が開示されている。 As an example of transmitting an intention of a video signal transmitting side to a receiving device, Patent Literature 1 discloses a technique in which a transmitting device transmits image quality adjustment information corresponding to a video signal transmitted from the transmitting device to the receiving device. Has been.
日本国公開特許公報「特開２０１０－２４６０５７号公報（２０１０年１０月２８日公開）」Japanese Patent Publication “Japanese Patent Laid-Open No. 2010-246057 (released on October 28, 2010)”
　特許文献１に開示されるような、映像の画質を調整する情報を、送信装置から受信装置に送信する技術は知られているが、トーンマッピングに用いられる関数を規定する情報を送信装置から受信装置に送信する具体的な仕組みはない。 A technique for transmitting image quality adjustment information disclosed in Patent Document 1 from a transmission apparatus to a reception apparatus is known, but information defining a function used for tone mapping is received from the transmission apparatus. There is no specific mechanism for transmitting to the device.
　受信装置で映像信号に施されるトーンマッピングが、映像データを送信する側の意図が反映されたものでなかった場合、映像信号を送信する側の意図と異なる映像が表現されるという問題がある。 If the tone mapping applied to the video signal in the receiving apparatus does not reflect the intention of the video data transmitting side, there is a problem that a video different from the intention of the video signal transmitting side is expressed. .
　本発明は、前記の問題点に鑑みてなされたものであり、その目的は、映像信号を送信する側の意図が反映されたトーンマッピングが、受信装置において映像信号に施されることを実現することにある。 The present invention has been made in view of the above problems, and an object of the present invention is to realize that tone mapping that reflects the intention of the video signal transmitting side is applied to the video signal in the receiving device. There is.
　上記の課題を解決するために、本発明の一態様に係る送信装置は、画像データを受信装置へ送信する送信装置であって、上記受信装置において上記画像データに施されるトーンマッピングに用いる複数のパラメータを含むパラメータセットを決定する決定部と、上記パラメータを上記受信装置へ送信する送信部とを備えている。 In order to solve the above-described problem, a transmission device according to an aspect of the present invention is a transmission device that transmits image data to a reception device, and a plurality of transmission devices used for tone mapping performed on the image data in the reception device. A determining unit that determines a parameter set including the parameters, and a transmitting unit that transmits the parameters to the receiving device.
　また、本発明の一態様に係る受信装置は、画像データを送信装置から受信する受信装置であって、上記画像データに施されるトーンマッピングに用いる複数のパラメータを含むパラメータセットを受信する受信部と、上記パラメータセットを用いて、上記画像データにトーンマッピングを施す画像処理部とを備えている。 A receiving apparatus according to an aspect of the present invention is a receiving apparatus that receives image data from a transmitting apparatus, and that receives a parameter set including a plurality of parameters used for tone mapping applied to the image data. And an image processing unit that performs tone mapping on the image data using the parameter set.
　本発明の一態様によれば、映像信号を送信する側の意図が反映されたトーンマッピングが、受信装置において映像信号に施すことができる、という効果を奏する。 According to one aspect of the present invention, there is an effect that tone mapping that reflects the intention of the video signal transmitting side can be applied to the video signal in the receiving device.
本発明の実施形態１に係る送受信システムの機能ブロック図である。It is a functional block diagram of the transmission / reception system which concerns on Embodiment 1 of this invention. 受信装置の外観を示す図である。It is a figure which shows the external appearance of a receiver. 本発明の実施形態１に係る送信装置における制御のフローチャートである。It is a flowchart of control in the transmission apparatus which concerns on Embodiment 1 of this invention. ＨＤＭＩ２．０ａで規定されるテーブルである。It is a table defined by HDMI 2.0a. ＨＤＭＩ２．０ａで規定されるテーブルである。It is a table defined by HDMI 2.0a. 本発明の実施形態１に係る送信装置と受信装置がＨＤＭＩ接続している場合のメタ情報の送付の一例である。It is an example of transmission of meta information in case the transmission apparatus and reception apparatus which concern on Embodiment 1 of this invention are HDMI-connected. 本発明の実施形態１に係る送信装置と受信装置がＨＤＭＩ接続している場合のメタ情報の送付の一例である。It is an example of transmission of meta information in case the transmission apparatus and reception apparatus which concern on Embodiment 1 of this invention are HDMI-connected. 本発明の実施形態１に係る送信装置が受信装置に放送波でメタ情報を送信する送信方法の一例である。It is an example of the transmission method in which the transmission apparatus which concerns on Embodiment 1 of this invention transmits meta information to a receiving apparatus with a broadcast wave. 本発明の実施形態１に係る送信装置が受信装置に放送波でメタ情報を送信する送信方法の一例である。It is an example of the transmission method in which the transmission apparatus which concerns on Embodiment 1 of this invention transmits meta information to a receiving apparatus with a broadcast wave. 本発明の実施形態１に係る受信装置における制御のフローチャートである。It is a flowchart of the control in the receiver which concerns on Embodiment 1 of this invention. 本発明の実施形態１に係る受信装置におけるトーンマッピングによる変換を示すグラフである。It is a graph which shows the conversion by the tone mapping in the receiver which concerns on Embodiment 1 of this invention. 本発明の実施形態２に係る送受信システムの機能ブロック図である。It is a functional block diagram of the transmission / reception system which concerns on Embodiment 2 of this invention. 本発明の実施形態２に係る受信装置におけるトーンマッピングによる変換を示すグラフである。It is a graph which shows the conversion by the tone mapping in the receiver which concerns on Embodiment 2 of this invention. 本発明の実施形態１に係る送信装置が受信装置にメタ情報を送信する送信方法の一例である。It is an example of the transmission method which the transmission apparatus which concerns on Embodiment 1 of this invention transmits meta information to a reception apparatus.
　〔実施形態１〕
　以下、本発明の実施の形態について、図１～図１１に基づいて詳細に説明する。 Embodiment 1
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
　図１は、本実施形態に係る送受信システム１の概要を示す機能ブロック図である。 FIG. 1 is a functional block diagram showing an outline of a transmission / reception system 1 according to the present embodiment.
　送受信システム１は、カメラ１０、送信装置２０、および受信装置３０を含んでいる。 The transmission / reception system 1 includes a camera 10, a transmission device 20, and a reception device 30.
　カメラ１０は、被写体を撮像し、映像信号を送信装置２０に出力する。 The camera 10 images a subject and outputs a video signal to the transmission device 20.
　送信装置２０は、画像処理部２２、エンコーダ２４、メタ情報決定部２６、および送信部２８を備えている。 The transmission apparatus 20 includes an image processing unit 22, an encoder 24, a meta information determination unit 26, and a transmission unit 28.
　画像処理部２２は、カメラ１０から映像信号を取得し、ＨＤＲ信号における輝度値と階調値との対応関係であるＯＥＴＦ（Opto-Electronic Transfer Function）を用いて、映像信号を階調信号に変換する。ＯＥＴＦは、下記式（１）で表される。 The image processing unit 22 acquires a video signal from the camera 10 and converts the video signal into a gradation signal using an OETF (Opto-Electronic Transfer Function) that is a correspondence relationship between a luminance value and a gradation value in the HDR signal. To do. OETF is represented by the following formula (1).
Figure JPOXMLDOC01-appb-M000001
Figure JPOXMLDOC01-appb-M000001
　ここで、Ｅは基準白レベルで正規化された映像信号の輝度値である。またａ＝０．１７８８３２７７であり、ｂ＝０．２８４６６８９２であり、ｃ＝０．５５９９１０７３である。 Here, E is the luminance value of the video signal normalized at the reference white level. Further, a = 0.78883277, b = 0.28466892, and c = 0.59959973.
　エンコーダ２４は、画像処理部２２が変換して得られた階調信号を取得し、取得した階調信号をエンコードする。 The encoder 24 acquires the gradation signal obtained by the conversion by the image processing unit 22, and encodes the acquired gradation signal.
　メタ情報決定部２６は、ＨＬＧ放送波のメタ情報としてパラメータａ，ｂ，ｃ，ｌ，ｍ，ｎを含むパラメータセットを決定する。映像信号を送信する側は、受信装置３０の表示部４０で表示させたい映像表現に応じて下記式（２）で表されるＯＥＴＦ－１（Inverse of Opto-Electronic Transfer Function）、および下記式（３）で表されるＯＯＴＦ（Opto-Optical Transfer Function）を決定する。パラメータａ，ｃは、下記式（２）で表されるＯＥＴＦ－１の指数に関連している。パラメータｂは、下記式（２）で表されるＯＥＴＦ－１の切片を規定する。パラメータｌは、このＯＯＴＦの下記式（４）で表されるパラメータγの切片を規定する。パラメータｍは、パラメータγに含まれる対数の比例係数を規定する。パラメータｎは、パラメータγに含まれる対数の真数に関連している。 The meta information determination unit 26 determines a parameter set including parameters a, b, c, l, m, and n as meta information of the HLG broadcast wave. The video signal transmitting side transmits an OETF −1 (Inverse of Opto-Electronic Transfer Function) expressed by the following formula (2) according to the video expression to be displayed on the display unit 40 of the receiving device 30, and the following formula ( The OOTF (Opto-Optical Transfer Function) represented by 3) is determined. The parameters a and c are related to the index of OETF −1 represented by the following formula (2). The parameter b defines an OETF -1 intercept expressed by the following equation (2). The parameter l defines the intercept of the parameter γ expressed by the following equation (4) of this OOTF. The parameter m defines a logarithmic proportionality factor included in the parameter γ. The parameter n is related to the logarithm of the true number included in the parameter γ.
Figure JPOXMLDOC01-appb-M000002
Figure JPOXMLDOC01-appb-M000002
Figure JPOXMLDOC01-appb-M000003
Figure JPOXMLDOC01-appb-M000003
Figure JPOXMLDOC01-appb-M000004
Figure JPOXMLDOC01-appb-M000004
　ＦＤは、表示される映像の輝度値である。式（３）に現れるＹｓは、下記式（５）によって表される。また式（３）に現れるαは下記式（６）によって表される。また式（３）に現れるβは下記式（７）によって表される。 F D is the luminance value of the image to be displayed. Y s appearing in formula (3) is represented by the following formula (5). Further, α appearing in the formula (3) is represented by the following formula (6). Further, β appearing in the formula (3) is represented by the following formula (7).
Figure JPOXMLDOC01-appb-M000005
Figure JPOXMLDOC01-appb-M000005
Figure JPOXMLDOC01-appb-M000006
Figure JPOXMLDOC01-appb-M000006
Figure JPOXMLDOC01-appb-M000007
Figure JPOXMLDOC01-appb-M000007
　式（４）に現れるＬｗは、受信装置３０の表示部４０が有する固有値であり、表示部４０が有する最大輝度パラメータである。 Lw appearing in Equation (4) is an eigenvalue that the display unit 40 of the receiving device 30 has, and is a maximum luminance parameter that the display unit 40 has.
　送信部２８は、エンコーダ２４によってエンコードされた階調信号と、メタ情報決定部２６が決定したメタ情報とを含む送信用信号を受信装置３０に送信する。 The transmission unit 28 transmits a transmission signal including the gradation signal encoded by the encoder 24 and the meta information determined by the meta information determination unit 26 to the reception device 30.
　受信装置３０は、受信部３２、デコーダ３４、画像処理部３６、表示制御部３８、および表示部４０を備えている。また図２は、受信装置３０の外観を示す正面図である。 The receiving device 30 includes a receiving unit 32, a decoder 34, an image processing unit 36, a display control unit 38, and a display unit 40. FIG. 2 is a front view showing the appearance of the receiving device 30.
　受信部３２は、送信装置２０の送信部２８が送信した階調信号とメタ情報とを含む送信用信号を受信する。 The reception unit 32 receives a transmission signal including the gradation signal and meta information transmitted by the transmission unit 28 of the transmission device 20.
　デコーダ３４は、エンコードされている階調信号をデコードする。 The decoder 34 decodes the encoded gradation signal.
　画像処理部３６は、ＯＥＴＦ－１、およびＯＯＴＦを用いて、階調信号に変換を施して輝度値を算出する。この変換は、トーンマッピングとも呼ばれる。ここで、ＯＥＴＦ－１を規定するａ，ｂ，ｃは、送信装置２０のメタ情報決定部２６が決定する。また、ＯＯＴＦを規定するパラメータγは、送信装置２０のメタ情報決定部２６が決定したパラメータｌ，ｍ，ｎによって規定される。また三原色の各々の表示部４０における輝度値は下記式（８）～式（１０）で表される。 The image processing unit 36 converts the gradation signal using OETF −1 and OOTF to calculate a luminance value. This conversion is also called tone mapping. Here, a, b, and c that define OETF −1 are determined by the meta information determination unit 26 of the transmission device 20. Further, the parameter γ that defines OOTF is defined by parameters l, m, and n determined by the meta information determination unit 26 of the transmission device 20. In addition, the luminance values in the display units 40 of the three primary colors are expressed by the following equations (8) to (10).
Figure JPOXMLDOC01-appb-M000008
Figure JPOXMLDOC01-appb-M000008
Figure JPOXMLDOC01-appb-M000009
Figure JPOXMLDOC01-appb-M000009
Figure JPOXMLDOC01-appb-M000010
Figure JPOXMLDOC01-appb-M000010
　表示制御部３８は、トーンマッピングの適用により得られた輝度値に応じた映像が表示されるように表示部４０を制御する。 The display control unit 38 controls the display unit 40 so that an image corresponding to the luminance value obtained by applying tone mapping is displayed.
　受信装置２０はテレビジョン受像機であってよく、表示部４０は、テレビジョン受像機のディスプレイであってよい。 The receiving device 20 may be a television receiver, and the display unit 40 may be a display of the television receiver.
　なお映像を表示部４０は、受信装置３０に含まれているが、映像を表示する機構は受信装置３０の外部機器であってもよい。 The video display unit 40 is included in the receiving device 30, but the mechanism for displaying the video may be an external device of the receiving device 30.
　また本実施形態は、カメラ１０が送信装置２０の外部機器であるが、カメラ１０は送信装置２０に含まれていてもよい。 In this embodiment, the camera 10 is an external device of the transmission device 20, but the camera 10 may be included in the transmission device 20.
　続いて、図３のフローチャートを参照して、本実施形態に係る送信装置２０における制御の一例を説明する。 Subsequently, an example of control in the transmission apparatus 20 according to the present embodiment will be described with reference to the flowchart of FIG.
　ステップＳ１０において、画像処理部２２は、カメラ１０から映像信号を取得する。 In step S <b> 10, the image processing unit 22 acquires a video signal from the camera 10.
　ステップＳ１２において、画像処理部２２は、映像信号にＯＥＴＦを用いた画像処理を施す。 In step S12, the image processing unit 22 performs image processing using OETF on the video signal.
　ステップＳ１４において、エンコーダ２４は、画像処理部２２で画像処理が施された階調信号をエンコードする。 In step S14, the encoder 24 encodes the gradation signal subjected to the image processing by the image processing unit 22.
　ステップＳ１６において、メタ情報決定部２６は、ＯＥＴＦ－１のパラメータａ，ｂ，ｃ、およびＯＯＴＦのパラメータγを規定するパラメータｌ，ｍ，ｎを決定する。メタ情報決定部２６は、映像データを送信する側の作業者による送信装置２０への入力操作に応じてメタ情報を決定してもよいし、映像信号の輝度値に応じて決定してもよい。 In step S16, the meta information determination unit 26 determines parameters l, m, and n that define the parameters a, b, and c of OOTF- 1 and the parameter γ of OOTF. The meta information determination unit 26 may determine meta information according to an input operation to the transmission device 20 by an operator on the video data transmission side, or may determine according to the luminance value of the video signal. .
　ステップＳ１８において、送信部２８は、エンコーダ２４でエンコードされた階調信号、およびメタ情報決定部２６で決定されたメタ情報を受信装置３０に送信する。 In step S18, the transmission unit 28 transmits the gradation signal encoded by the encoder 24 and the meta information determined by the meta information determination unit 26 to the reception device 30.
　続いて、図４～図９を参照して、メタ情報の送信態様の例を説明する。 Next, an example of meta information transmission mode will be described with reference to FIGS.
　まず、図４～図７を参照して、送信装置２０と受信装置３０とがＨＤＭＩ（登録商標）（High-Definition Multimedia Interface：高精細度マルチメディアインターフェース）接続している場合のメタ情報の送信態様の例を説明する。ＨＤＭＩ接続とは、ＨＤＭＩ規格に準拠するＴＭＤＳ（Transition Minimized Differential Signaling）およびＣＥＣ（Consumer Electronics Control）などの各信号を伝送可能な有線または無線による接続を意味する。 First, referring to FIG. 4 to FIG. 7, transmission of meta information when the transmission apparatus 20 and the reception apparatus 30 are connected via HDMI (registered trademark) (High-Definition Multimedia Interface). The example of an aspect is demonstrated. The HDMI connection means a wired or wireless connection capable of transmitting each signal such as TMDS (Transition Minimized Differential Signaling) and CEC (Consumer Electronics Control) compliant with the HDMI standard.
　図４および図５は、ＨＤＭＩ２．０ａで規定されるテーブルを示している。 4 and 5 show tables defined in HDMI 2.0a.
　図４は、ダイナミック・レンジおよびMastering InfoFrameのテーブルを示している。メタ情報は、ダイナミック・レンジおよびMastering InfoFrameとして送信装置２０から受信装置３０に送信される。 Fig. 4 shows a table of dynamic range and Mastering InfoFrame. The meta information is transmitted from the transmission device 20 to the reception device 30 as a dynamic range and Mastering InfoFrame.
　図５は、３番目以降のData Byteにおいて用いられる構造を示すテーブルを示している。 FIG. 5 shows a table indicating the structure used in the third and subsequent Data bytes.
　図６は、本実施形態で用いられるメタ情報のテーブルを示している。図６に示されるように、本実施形態では、メタ情報決定部２６は、Static_Metadata_Descriptor_IDが“1”の場合のMetadata Descriptorを“Static metadata Type2”と定義する。すなわち、メタ情報決定部２６は、この図６に示されるテーブルを生成する。 FIG. 6 shows a table of meta information used in this embodiment. As shown in FIG. 6, in the present embodiment, the meta information determination unit 26 defines Metadata Descriptor as “Static metadata Type2” when Static_Metadata_Descriptor_ID is “1”. That is, the meta information determination unit 26 generates the table shown in FIG.
　図７は、３番目以降のData Byteとパラメータとの具体的な対応関係を示すテーブルである。このテーブルは、メタ情報決定部２６がStatic_Metadata_Descriptor_IDが“1”の場合のMetadata Descriptorを“Static metadata Type2”と定義することによって定義される。すなわち、メタ情報決定部２６は、この図７に示されるテーブルを生成する。 FIG. 7 is a table showing a specific correspondence between the third and subsequent Data bytes and parameters. This table is defined by the metadata information determining unit 26 defining Metadata Descriptor as “Static metadata Type2” when Static_Metadata_Descriptor_ID is “1”. That is, the meta information determination unit 26 generates the table shown in FIG.
　図７におけるGroup1は、半精度浮動小数点（2byteコード）で表現されている。すなわち、ＯＯＴＦのパラメータｌ，ｍ，ｎは、２つのData Byteで表現されている。なお“LSB”は、least significant byte（最下位バイト）の略で、各パラメータの後半部分を表現する。また“MSB”は、most significant byte（最上位バイト）の略で、各パラメータの前半部分を表現する。メタ情報決定部２６は、パラメータｌ，ｍ，ｎの全てが０の場合、もしくは該当Metadata_Descriptorを送信しない、または該当Metadata_Descriptorが存在しない場合は、パラメータγを１．２の固定値に決定する。すなわち、本実施形態において、該当Metadata_Descriptorを送信しない、または該当Metadata_Descriptorが存在しない場合は、送信部２８は、メタ情報を送信しなくてもよい。受信装置３０は、メタ情報を受信しなかった場合、パラメータγ＝１．２としてＯＯＴＦを用いたトーンマッピングを行えばよい。 * Group 1 in Fig. 7 is expressed in half-precision floating point (2-byte code). That is, the OOTF parameters l, m, and n are expressed by two Data Bytes. Note that “LSB” is an abbreviation for leastificsignificant byte (the least significant byte) and represents the latter half of each parameter. “MSB” is an abbreviation of “most significant byte” and represents the first half of each parameter. When all of the parameters l, m, and n are 0, or when the corresponding Metadata_Descriptor is not transmitted or when the corresponding Metadata_Descriptor does not exist, the meta information determination unit 26 determines the parameter γ to be a fixed value of 1.2. That is, in the present embodiment, when the corresponding Metadata_Descriptor is not transmitted or when the corresponding Metadata_Descriptor does not exist, the transmitting unit 28 does not have to transmit the meta information. When receiving the meta information, the receiving device 30 may perform tone mapping using OOTF with the parameter γ = 1.2.
　また図７におけるGroup2は、単精度浮動小数点（4byteコード）で表現されている。すなわち、ＯＥＴＦ－１のパラメータａ，ｂ，ｃは、４つのData Byteで表現されている。メタ情報決定部２６は、パラメータａ，ｂ，ｃの全てが０の場合、もしくは該当Metadata_Descriptorを送信しない、または該当Metadata_Descriptorが存在しない場合に、ａ，ｂ，ｃを、ＨＬＧ規格にて定義された、ａ＝０．１７８８３２７７、ｂ＝０．２８４６６８９２、ｃ＝０．５５９９１０７３に決定する。すなわち、本実施形態において、該当Metadata_Descriptorを送信しない、または該当Metadata_Descriptorが存在しない場合は、送信部２８は、メタ情報を送信しなくてもよい。受信装置３０は、メタ情報を受信しなかった場合、ａ＝０．１７８８３２７７、ｂ＝０．２８４６６８９２、ｃ＝０．５５９９１０７３として、ＯＥＴＦ－１を用いたトーンマッピングを行えばよい。 Further, Group2 in FIG. 7 is expressed by a single precision floating point (4 byte code). That is, the parameters a, b, and c of OETF- 1 are expressed by four Data Bytes. The meta information determination unit 26 defines a, b, and c in the HLG standard when all of the parameters a, b, and c are 0, or when the corresponding Metadata_Descriptor is not transmitted or when the corresponding Metadata_Descriptor does not exist. , A = 0.78883277, b = 0.28466892, and c = 0.55991073. That is, in the present embodiment, when the corresponding Metadata_Descriptor is not transmitted or when the corresponding Metadata_Descriptor does not exist, the transmitting unit 28 does not have to transmit the meta information. If the meta information is not received, the receiving apparatus 30 may perform tone mapping using OETF -1 such that a = 0.78883277, b = 0.284668892, and c = 0.59959973.
　次に、図８～図９は、放送波で送信装置２０から受信装置３０へメタ情報を送信する場合に用いられるテーブルの例を示している。 Next, FIGS. 8 to 9 show examples of tables used when meta information is transmitted from the transmission device 20 to the reception device 30 by broadcast waves.
　図８に示されるように、メタ情報決定部２６は、video_EOTF_param_g1、およびvideo_EOTF_param_g2を含む映像コンポーネント記述子Video_Component_Descriptorを生成する。送信部２８は、映像コンポーネント記述子Video_Component_Descriptorを受信装置３０に送信する。ここで、高度ＢＳデジタル放送の多重化方式としてＭＭＴを用いた場合、送信部２８は、Video_Component_Descriptorを、ＭＭＴ－ＳＩメッセージのＰＡメッセージに格納されているＭＰＴ（MMT Package Table）に含めて送信する。 As shown in FIG. 8, the meta information determination unit 26 generates a video component descriptor Video_Component_Descriptor including video_EOTF_param_g1 and video_EOTF_param_g2. The transmission unit 28 transmits the video component descriptor Video_Component_Descriptor to the reception device 30. Here, when MMT is used as a multiplexing scheme for advanced BS digital broadcasting, the transmission unit 28 transmits Video_Component_Descriptor by including it in an MPT (MMT Package Table) stored in the PA message of the MMT-SI message.
　図９は、Groupがvideo_EOTF_param_g1、またはvideo_EOTF_param_g12に含まれる各DataByteとパラメータｌ，ｍ，ｎ，ａ，ｂ，ｃとの具体的な対応関係を示すテーブルである。 FIG. 9 is a table showing a specific correspondence between each DataByte included in video_EOTF_param_g1 or video_EOTF_param_g12 and parameters l, m, n, a, b, and c.
　図９におけるvideo_EOTF_param_g1は、半精度浮動小数点（2byteコード）で表現されている。すなわち、ＯＯＦＴのパラメータｌ，ｍ，ｎは、２つのData Byteで表現されている。メタ情報決定部２６は、パラメータｌ，ｍ，ｎの全てが０の場合、もしくは該当Metadata_Descriptorを送信しない、または該当Metadata_Descriptorが存在しない場合は、パラメータγを１．２の固定値に決定する。すなわち、本実施形態において、該当Metadata_Descriptorを送信しない、または該当Metadata_Descriptorが存在しない場合は、送信部２８は、メタ情報を送信しなくてもよい。受信装置３０は、メタ情報を受信しなかった場合、パラメータγ＝１．２としてＯＯＴＦを用いたトーンマッピングを行えばよい。 In FIG. 9, video_EOTF_param_g1 is expressed in half precision floating point (2 byte code). That is, the OOFT parameters l, m, and n are expressed by two Data 、 ２Bytes. When all of the parameters l, m, and n are 0, or when the corresponding Metadata_Descriptor is not transmitted or when the corresponding Metadata_Descriptor does not exist, the meta information determination unit 26 determines the parameter γ to be a fixed value of 1.2. That is, in the present embodiment, when the corresponding Metadata_Descriptor is not transmitted or when the corresponding Metadata_Descriptor does not exist, the transmitting unit 28 does not have to transmit the meta information. When receiving the meta information, the receiving device 30 may perform tone mapping using OOTF with the parameter γ = 1.2.
　図９におけるvideo_EOTF_param_g2は、単精度浮動小数点（4byteコード）で表現されている。すなわち、ＯＥＴＦ－１のパラメータａ，ｂ，ｃは、４つのData Byteで表現されている。メタ情報決定部２６は、パラメータａ，ｂ，ｃの全てが０の場合、もしくは該当Metadata_Descriptorを送信しない、または該当Metadata_Descriptorが存在しない場合は、ａ，ｂ，ｃは、ＨＬＧ規格にて定義された、ａ＝０．１７８８３２７７、ｂ＝０．２８４６６８９２、ｃ＝０．５５９９１０７３に決定する。すなわち、本実施形態において、該当Metadata_Descriptorを送信しない、または該当Metadata_Descriptorが存在しない場合は、送信部２８は、メタ情報を送信しなくてもよい。受信装置３０は、メタ情報を受信しなかった場合、ａ＝０．１７８８３２７７、ｂ＝０．２８４６６８９２、ｃ＝０．５５９９１０７３として、ＯＥＴＦ－１を用いたトーンマッピングを行えばよい。 In FIG. 9, video_EOTF_param_g2 is expressed in single precision floating point (4 byte code). That is, the parameters a, b, and c of OETF- 1 are expressed by four Data Bytes. When all of parameters a, b, and c are 0, or when the corresponding Metadata_Descriptor is not transmitted, or when the corresponding Metadata_Descriptor does not exist, the metadata information determining unit 26 is defined in the HLG standard. , A = 0.78883277, b = 0.28466892, and c = 0.55991073. That is, in the present embodiment, when the corresponding Metadata_Descriptor is not transmitted or when the corresponding Metadata_Descriptor does not exist, the transmitting unit 28 does not have to transmit the meta information. If the meta information is not received, the receiving apparatus 30 may perform tone mapping using OETF -1 such that a = 0.78883277, b = 0.284668892, and c = 0.59959973.
　続いて、図１０のフローチャートを参照して、本実施形態に係る受信装置３０における制御の一例を説明する。 Subsequently, an example of control in the receiving device 30 according to the present embodiment will be described with reference to the flowchart of FIG.
　ステップＳ２０において、受信部３２は、送信装置２０が送信した階調信号、およびメタ情報を受信する。 In step S20, the reception unit 32 receives the gradation signal and meta information transmitted by the transmission device 20.
　ステップＳ２２において、デコーダ３４は、エンコードされている階調信号をデコードする。 In step S22, the decoder 34 decodes the encoded gradation signal.
　ステップＳ２４において、画像処理部３６は、パラメータｌ，ｍ，ｎと表示部４０が有する固有値Ｌｗからパラメータγを計算する。画像処理部３６は、表示部４０が有する固有値Ｌｗを用いてパラメータγを計算するので表示部４０の特性に合った映像を得ることができる。そして、画像処理部３６は、ＯＥＴＦ－１、およびＯＯＴＦを用いてトーンマッピングを階調信号に施し、映像信号を送信する側が受信装置３０の表示部４０で表示させたい映像表現を実現できる輝度値を得る。 In step S <b> 24, the image processing unit 36 calculates the parameter γ from the parameters l, m, n and the eigenvalue Lw that the display unit 40 has. Since the image processing unit 36 calculates the parameter γ using the eigenvalue Lw of the display unit 40, an image suitable for the characteristics of the display unit 40 can be obtained. Then, the image processing unit 36 performs tone mapping on the gradation signal using OETF −1 and OOTF, and the luminance value that can realize the video expression that the video signal transmitting side wants to display on the display unit 40 of the receiving device 30. Get.
　ステップＳ２６において、表示制御部３８は、輝度値に応じた映像を表示するように表示部４０を制御する。 In step S26, the display control unit 38 controls the display unit 40 to display an image corresponding to the luminance value.
　図１１は、画像処理部３６によって処理される送信装置２０から受信した階調信号（入力信号Ｅ’）と、入力信号Ｅ’にＯＥＴＦ－１、およびＯＯＴＦを用いた変換を施して得られた輝度値との対応関係を示している。この変換は、トーンマッピングとも呼ばれ、この変換における階調値と輝度値との対応関係は、トーンカーブとも呼ばれる。変換を施して得られた輝度値は、表示部４０に表示される映像の輝度値である。 FIG. 11 is obtained by converting the gradation signal (input signal E ′) received from the transmission device 20 processed by the image processing unit 36 and the input signal E ′ using OETF −1 and OOTF. The correspondence relationship with the luminance value is shown. This conversion is also called tone mapping, and the correspondence between the gradation value and the luminance value in this conversion is also called a tone curve. The luminance value obtained by performing the conversion is the luminance value of the video displayed on the display unit 40.
　図１１に示される通り、パラメータγの値に応じて表示部４０における輝度は変わる。パラメータγ＝１．０の場合は、暗部が明るめになる。パラメータγ＝１．４の場合は、暗部が暗めになる。パラメータγ＝１．２の場合は、暗部がパラメータγ＝１．０の場合とパラメータγ＝１．４の場合との間の明るさとなる。 As shown in FIG. 11, the brightness in the display unit 40 changes according to the value of the parameter γ. When the parameter γ = 1.0, the dark part becomes brighter. When the parameter γ = 1.4, the dark part becomes dark. When the parameter γ = 1.2, the dark portion has brightness between the case where the parameter γ = 1.0 and the case where the parameter γ = 1.4.
　なお、本実施形態では、パラメータｌ，ｍ，ｎ，ａ，ｂ，ｃの全てを送信装置２０から受信装置３０に送信しているが、常に全てのパラメータを送信しなくてもよく、少なくとも一部のパラメータを送信するのであってもよい。例えば、パラメータの一部が映像信号に関わらず常に同じ値であるならば、常に同じ値である一部のパラメータは予め受信装置３０が有していてもよい。そして、送信装置２０は、映像信号によって値が変わるパラメータのみを受信装置３０に送信すればよい。 In the present embodiment, all of the parameters l, m, n, a, b, and c are transmitted from the transmission device 20 to the reception device 30, but it is not always necessary to transmit all the parameters. Some parameters may be transmitted. For example, if some of the parameters always have the same value regardless of the video signal, the receiving apparatus 30 may have some parameters that always have the same value. Then, the transmission device 20 only has to transmit to the reception device 30 only parameters whose values change depending on the video signal.
　〔実施形態２〕
　本発明の他の実施形態について、図１２～図１４に基づいて説明すれば、以下のとおりである。なお、説明の便宜上、前記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。 [Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIGS. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.
　図１２に示されるように、本実施形態は、受信装置５０が選択部５２を更に備える点において、実施形態１と異なる。 As shown in FIG. 12, the present embodiment is different from the first embodiment in that the reception device 50 further includes a selection unit 52.
　受信装置５０は、送信装置２０から複数のパラメータセットを受信する場合がある。この場合、選択部５２は、受信部３２が受信する複数のパラメータセットのうち何れかのパラメータセットのセットを用いてトーンマッピングを行うかを選択する。 The receiving device 50 may receive a plurality of parameter sets from the transmitting device 20. In this case, the selection unit 52 selects whether to perform tone mapping using any one of the plurality of parameter sets received by the reception unit 32.
　選択部５２は、ユーザの入力操作に応じてパラメータセットを選択してもよい。 The selection unit 52 may select a parameter set according to a user input operation.
　また、選択部５２は、映像を表示する表示部４０の周辺の輝度に応じてパラメータセットを選択してもよい。例えば、周辺の輝度が高い場合は、暗部が暗いとユーザが映像を視認しにくくなる。したがって、選択部５２は、暗部が明るめとなるγ（図１１に示す例においては、γ＝１．０）を規定するパラメータセットを選択すればよい。逆に選択部５２は、周辺の輝度が低い場合は、暗部が暗めとなるγ（図１１に示す例においては、γ＝１．４）を規定するパラメータセットを選択すればよい。 Further, the selection unit 52 may select a parameter set according to the luminance around the display unit 40 that displays the video. For example, when the peripheral brightness is high, it is difficult for the user to visually recognize the video when the dark part is dark. Therefore, the selection unit 52 may select a parameter set that defines γ (γ in the example shown in FIG. 11) that makes the dark part brighter. Conversely, the selection unit 52 may select a parameter set that defines γ (γ = 1.4 in the example shown in FIG. 11) that darkens the dark portion when the surrounding luminance is low.
　さらに、選択部５２は、表示部４０に表示されている映像のジャンルに応じてパラメータセットを選択してもよい。例えば、選択部５２は、映像のジャンルが映画であれば、暗部が暗くなるパラメータセットを選択すればよい。また選択部５２は、映像のジャンルがバラエティ番組であれば、暗部が明るくなるパラメータセットを選択すればよい。また選択部５２は、映像のジャンルがニュースであれば暗部が暗くも明るくもならないパラメータセット（図１１に示す例においては、γ＝１．２を規定するパラメータセット）を選択すればよい。 Furthermore, the selection unit 52 may select a parameter set according to the genre of the video displayed on the display unit 40. For example, if the video genre is a movie, the selection unit 52 may select a parameter set that darkens the dark part. Further, if the genre of the video is a variety program, the selection unit 52 may select a parameter set in which the dark part becomes bright. Further, if the video genre is news, the selection unit 52 may select a parameter set (a parameter set that defines γ = 1.2 in the example shown in FIG. 11) in which the dark part is not dark but bright.
　続いて、図１３のフローチャートを参照して、本実施形態に係る受信装置５０における制御の一例を説明する。 Subsequently, an example of control in the receiving device 50 according to the present embodiment will be described with reference to the flowchart of FIG.
　図１３に示されるように、本実施形態は、ステップＳ２２とステップＳ２４の間にステップＳ３０を含む点において、実施形態１と異なる。 As shown in FIG. 13, the present embodiment is different from the first embodiment in that step S30 is included between step S22 and step S24.
　ステップＳ３０において、選択部５２は、受信部３２が受信する複数のパラメータセットのうち何れかのパラメータセットを用いてトーンマッピングを行うかを選択する。 In step S30, the selection unit 52 selects whether to perform tone mapping using any one of a plurality of parameter sets received by the reception unit 32.
　次に、図１４は、本実施形態においてメタ情報決定部２６が生成するテーブルを示している。図１４に示されるテーブルは、複数のパラメータセットを含んでいる。データの先頭バイト（Data Byteが３）にnumber_of_parameter（以後、ｎと称する）を配置し、送出されるパラメータセット数を示す。ｎ＝１の場合、Data Byte４からData Byte２１で１セット分のデータが送信される（送信されるパラメータセットが１セットの場合は、受信装置側でパラメータセットを選択することはなく、パラメータは一意に決まる。）。ｎ≧２の場合、Data Byte４以降に１８つのData Byteで表現される１セット目のパラメータが送信され、Data Byte２２～３９に２セット目のパラメータセットが送信される。３セット目以降も同様である。 Next, FIG. 14 shows a table generated by the meta information determination unit 26 in the present embodiment. The table shown in FIG. 14 includes a plurality of parameter sets. Number_of_parameter (hereinafter referred to as n) is arranged in the first byte of data (Data Byte is 3) to indicate the number of parameter sets to be transmitted. When n = 1, one set of data is transmitted from Data Byte 4 to Data Byte 21 (if the parameter set to be transmitted is one set, the receiving device does not select the parameter set, and the parameter is unique. Determined.) When n ≧ 2, the first set of parameters expressed by 18 Data Bytes is transmitted after Data Byte4, and the second parameter set is transmitted to Data Bytes 22 to 39. The same applies to the third and subsequent sets.
　〔ソフトウェアによる実現例〕
　送付装置２０の制御ブロック（特に画像処理部２２およびメタ情報決定部２６）、ならびに受信装置３０の制御ブロック（特に画像処理部３６）は、集積回路（ＩＣチップ）等に形成された論理回路（ハードウェア）によって実現してもよいし、ＣＰＵ（Central Processing Unit）を用いてソフトウェアによって実現してもよい。 [Example of software implementation]
The control block (especially the image processing unit 22 and the meta information determining unit 26) of the sending device 20 and the control block (particularly the image processing unit 36) of the receiving device 30 are logic circuits (IC chips) or the like formed in an integrated circuit (IC chip) or the like. Hardware) or software using a CPU (Central Processing Unit).
　後者の場合、送信装置２０および受信装置３０は、各機能を実現するソフトウェアであるプログラムの命令を実行するＣＰＵ、上記プログラムおよび各種データがコンピュータ（またはＣＰＵ）で読み取り可能に記録されたＲＯＭ（Read Only Memory）または記憶装置（これらを「記録媒体」と称する）、上記プログラムを展開するＲＡＭ（Random Access Memory）などを備えている。そして、コンピュータ（またはＣＰＵ）が上記プログラムを上記記録媒体から読み取って実行することにより、本発明の目的が達成される。上記記録媒体としては、「一時的でない有形の媒体」、例えば、テープ、ディスク、カード、半導体メモリ、プログラマブルな論理回路などを用いることができる。また、上記プログラムは、該プログラムを伝送可能な任意の伝送媒体（通信ネットワークや放送波等）を介して上記コンピュータに供給されてもよい。なお、本発明は、上記プログラムが電子的な伝送によって具現化された、搬送波に埋め込まれたデータ信号の形態でも実現され得る。 In the latter case, the transmitting device 20 and the receiving device 30 include a CPU that executes instructions of a program that is software that implements each function, and a ROM (Read that records the above-described program and various data so that the computer (or CPU) can read the program. Only Memory) or a storage device (these are referred to as “recording media”), RAM (Random Access Memory) for expanding the program, and the like. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.
　〔まとめ〕
　本発明の態様１に係る送信装置２０は、画像データを受信装置３０，５０へ送信する送信装置２０であって、上記受信装置３０，５０において上記画像データに施されるトーンマッピングに用いるパラメータを決定する決定部（メタ情報決定部２６）と、上記パラメータを上記受信装置３０，５０へ送信する送信部２８とを備えている。 [Summary]
The transmission device 20 according to the first aspect of the present invention is a transmission device 20 that transmits image data to the reception devices 30 and 50, and parameters used for tone mapping performed on the image data in the reception devices 30 and 50. A determining unit (meta information determining unit 26) for determining and a transmitting unit 28 for transmitting the parameters to the receiving devices 30 and 50 are provided.
　上記の構成によれば、映像信号を送信する側の意図が反映されたトーンマッピングが、受信装置３０，５０において映像信号に施すことができる。 According to the above configuration, tone mapping that reflects the intention of the video signal transmitting side can be applied to the video signal in the receiving devices 30 and 50.
　本発明の態様２に係る送信装置２０は、上記態様１において、上記トーンマッピングはＯＯＴＦを用い、上記決定部（メタ情報決定部２６）は、上記ＯＯＴＦのパラメータを決定してもよい。 In the transmission apparatus 20 according to the second aspect of the present invention, in the first aspect, the tone mapping may use OOTF, and the determination unit (meta information determination unit 26) may determine the parameter of the OOTF.
　上記の構成によれば、ＯＯＴＦをも含んだトーンマッピングをすることができるので、カメラ１０に撮像された映像に応じた映像を表示することができる。 According to the above configuration, tone mapping including OOTF can be performed, so that an image corresponding to the image captured by the camera 10 can be displayed.
　本発明の態様３に係る送信装置２０は、上記態様１または２において、上記トーンマッピングはＯＥＴＦ－１を用い、上記決定部（メタ情報決定部２６）は、上記ＯＥＴＦ－１のパラメータを決定してもよい。 The transmitting apparatus 20 according to aspect 3 of the present invention, in the above aspect 1 or 2, uses OETF -1 for the tone mapping, and the determination unit (meta information determination unit 26) determines the parameter of the OETF -1 May be.
　上記の構成によれば、ＯＥＴＦ－１をも含んだトーンマッピングをすることができる。 According to the above configuration, tone mapping including OETF -1 can be performed.
　本発明の態様４に係る受信装置３０，５０は、画像データを送信装置２０から受信する受信装置３０，５０であって、上記画像データに施されるトーンマッピングに用いるパラメータを受信する受信部３２と、上記パラメータを用いて、上記画像データにトーンマッピングを施す画像処理部３６とを備えている。 The receiving devices 30 and 50 according to the fourth aspect of the present invention are receiving devices 30 and 50 that receive image data from the transmitting device 20, and a receiving unit 32 that receives parameters used for tone mapping applied to the image data. And an image processing unit 36 that performs tone mapping on the image data using the parameters.
　上記の構成によれば、映像信号を送信する側の意図が反映されたトーンマッピングが、受信装置３０，５０において映像信号に施すことができる。 According to the above configuration, tone mapping that reflects the intention of the video signal transmitting side can be applied to the video signal in the receiving devices 30 and 50.
　本発明の態様５に係る受信装置５０は、上記態様４において、上記受信部３２が受信する複数のパラメータのうち何れのパラメータを用いてトーンマッピングを行うかを選択する選択部５２を更に備えてもよい。 The reception device 50 according to the fifth aspect of the present invention further includes the selection unit 52 that selects which one of the plurality of parameters received by the reception unit 32 is to be used for tone mapping in the fourth aspect. Also good.
　上記の構成によれば、映像信号を送信する側の意図に加え、受信の状況に合わせたトーンマッピングが受信装置５０において映像信号に施すことができる。 According to the above configuration, in addition to the intention of the video signal transmitting side, tone mapping in accordance with the reception situation can be applied to the video signal in the receiving device 50.
　本発明の態様６に係る受信装置３０，５０は、上記態様４または５において、上記トーンマッピングはＯＯＴＦを用い、上記パラメータは、上記ＯＯＴＦのパラメータであってもよい。 The receiving apparatuses 30 and 50 according to aspect 6 of the present invention may use OOTF as the tone mapping in the aspect 4 or 5, and the parameter may be a parameter of the OOTF.
　上記の構成によれば、ＯＯＴＦをも含んだトーンマッピングをすることができるので、カメラ１０に撮像された映像に応じた映像を表示することができる。 According to the above configuration, tone mapping including OOTF can be performed, so that an image corresponding to the image captured by the camera 10 can be displayed.
　本発明の態様７に係る表示装置は、態様４～６の何れか１態様において、上記トーンマッピングはＯＥＴＦ－１を用い、上記パラメータは、上記ＯＥＴＦ－１のパラメータであってもよい。 Display device according to embodiment 7 of the present invention, in any one of Embodiments 4-6, the tone mapping using OETF -1, the parameter may be a parameter of the OETF -1.
　上記の構成によれば、ＯＥＴＦ－１をも含んだトーンマッピングをすることができる。 According to the above configuration, tone mapping including OETF -1 can be performed.
　本発明の態様８に係る表示装置は、態様４～７の何れか１態様に記載の受信装置を備えている。 A display device according to aspect 8 of the present invention includes the receiving device according to any one of aspects 4 to 7.
　本発明は上述した各実施形態に限定されるものではなく、請求項に示した範囲で種々の変更が可能であり、異なる実施形態にそれぞれ開示された技術的手段を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。さらに、各実施形態にそれぞれ開示された技術的手段を組み合わせることにより、新しい技術的特徴を形成することができる。 The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.
　１，２　送受信システム
　２０　送信装置
　２６　メタ情報決定部（決定部）
　２８　送信部
　３０，５０　受信装置（表示装置）
　３２　受信部
　３６　画像処理部
　５２　選択部 1, 2 Transmission / reception system 20 Transmission device 26 Meta information determination unit (determination unit)
28 Transmitter 30, 50 Receiving device (display device)
32 receiving unit 36 image processing unit 52 selection unit

Claims (9)

  1. 　画像データを受信装置へ送信する送信装置であって、
    　上記受信装置において上記画像データに施されるトーンマッピングに用いる複数のパラメータを含むパラメータセットを決定する決定部と、
    　上記パラメータを上記受信装置へ送信する送信部と
    を備えることを特徴とする送信装置。     A transmitting device that transmits image data to a receiving device,
    A determination unit for determining a parameter set including a plurality of parameters used for tone mapping applied to the image data in the reception device;
    A transmission device comprising: a transmission unit that transmits the parameter to the reception device.
  2. 　上記決定部は、複数の上記パラメータセットを決定し、
    　上記送信部は、上記複数のパラメータセットを上記受信装置へ送信する
    ことを特徴とする請求項１に記載の送信装置。     The determining unit determines a plurality of the parameter sets,
    The transmission apparatus according to claim 1, wherein the transmission unit transmits the plurality of parameter sets to the reception apparatus.
  3. 　上記トーンマッピングはＯＯＴＦを用い、
    　上記決定部は、上記ＯＯＴＦのパラメータセットを決定する
    ことを特徴とする請求項１または２に記載の送信装置。     The tone mapping uses OOTF,
    The transmission apparatus according to claim 1, wherein the determination unit determines a parameter set of the OOTF.
  4. 　上記トーンマッピングはＯＥＴＦ－１を用い、
    　上記決定部は、上記ＯＥＴＦ－１のパラメータセットを決定する
    ことを特徴とする請求項１から３の何れか１項に記載の送信装置。     The tone mapping uses OETF -1 ,
    The transmission apparatus according to any one of claims 1 to 3, wherein the determination unit determines a parameter set of the OETF -1 .
  5. 　画像データを送信装置から受信する受信装置であって、
    　上記画像データに施されるトーンマッピングに用いる複数のパラメータを含むパラメータセットを受信する受信部と、
    　上記パラメータセットを用いて、上記画像データにトーンマッピングを施す画像処理部と
    を備えることを特徴とする受信装置。     A receiving device that receives image data from a transmitting device,
    A receiving unit for receiving a parameter set including a plurality of parameters used for tone mapping applied to the image data;
    An image processing unit that performs tone mapping on the image data using the parameter set.
  6. 　上記受信部が受信する複数のパラメータセットのうち何れかのパラメータセットを用いてトーンマッピングを行うかを選択する選択部
    を更に備えることを特徴とする請求項５に記載の受信装置。     The receiving apparatus according to claim 5, further comprising a selection unit that selects whether to perform tone mapping using any one of a plurality of parameter sets received by the reception unit.
  7. 　上記トーンマッピングはＯＯＴＦを用い、
    　上記パラメータセットは、上記ＯＯＴＦのパラメータセットである
    ことを特徴とする請求項５または６に記載の受信装置。     The tone mapping uses OOTF,
    The receiving apparatus according to claim 5 or 6, wherein the parameter set is a parameter set of the OOTF.
  8. 　上記トーンマッピングはＯＥＴＦ－１を用い、
    　上記パラメータセットは、上記ＯＥＴＦ－１のパラメータセットである
    ことを特徴とする請求項５～７の何れか１項に記載の受信装置。     The tone mapping uses OETF -1 ,
    The receiving apparatus according to any one of claims 5 to 7, wherein the parameter set is the OETF -1 parameter set.
  9. 　請求項５～８の何れか１項に記載の受信装置を備えている表示装置。 A display device comprising the receiving device according to any one of claims 5 to 8.
PCT/JP2017/023097 2016-06-28 2017-06-22 Transmitting device, receiving device, and display device WO2018003667A1 (en)

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