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WO2019039111A1 - Dispositif de traitement vidéo, appareil d'affichage, procédé de traitement vidéo, programme de commande, et support d'enregistrement - Google Patents

Dispositif de traitement vidéo, appareil d'affichage, procédé de traitement vidéo, programme de commande, et support d'enregistrement Download PDF

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Publication number
WO2019039111A1
WO2019039111A1 PCT/JP2018/025554 JP2018025554W WO2019039111A1 WO 2019039111 A1 WO2019039111 A1 WO 2019039111A1 JP 2018025554 W JP2018025554 W JP 2018025554W WO 2019039111 A1 WO2019039111 A1 WO 2019039111A1
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Prior art keywords
value
gradation
luminance level
gradation value
maximum
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English (en)
Japanese (ja)
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神田　貴史
下田　裕紀
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Sharp Corp
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Sharp Corp
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
    • G09G5/39—Control of the bit-mapped memory
    • G09G5/391—Resolution modifying circuits, e.g. variable screen formats
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information

Definitions

  • One aspect of the present invention relates to an image processing apparatus or the like that converts a gradation value of an HDR signal.
  • HDR High Dynamic Range
  • SDR Standard Dynamic Range
  • the SDR signal is manufactured on the premise of reproduction in an reproduction environment (hereinafter referred to as “SDR environment”) having an EOTF (Electro-Optical Transfer Function) of ⁇ 2.2 or the like, while the HDR signal is And SMPTE-ST 2084 (hereinafter, abbreviated as "ST2084") and the like, and is manufactured on the premise of regeneration in a reproduction environment (hereinafter, described as "SDR environment”) having an EOTF.
  • SDR environment SDR environment
  • the luminance of the obtained image is different from the luminance intended by the producer.
  • Patent Document 1 discloses a liquid crystal display device that performs light adjustment control of a backlight by changing the change width of the average luminance level before and after the expansion of the dynamic range according to the average luminance level of the input video signal and the ⁇ adjustment value. It is done.
  • Patent Document 2 discloses a scan conversion unit that scans and converts an input video signal into a signal having a predetermined number of scanning lines, a gamma correction unit that performs gamma correction on the signal from the scan conversion unit, and a signal level from the input video signal.
  • a plasma display is disclosed that includes a level detection unit that detects and controls a gamma correction unit based on the detection signal, and controls average brightness according to an input signal level.
  • the EOTF of the HDR signal is different from that of the SDR signal. Therefore, when attempting to map the entire EOTF domain for the HDR signal to the EOTF domain for the SDR signal when converting the grayscale values taken by each pixel with the HDR signal, the tone values are degraded (different floors It may occur that tone values are mapped to the same tone value).
  • the number of gradations per unit luminance difference is particularly large in the low luminance region in order to express a slight difference between light and dark in the dark part. Therefore, when the gradation value taken by each pixel is converted with the HDR signal by such mapping, degeneration of the gradation value is likely to occur in the low luminance region.
  • the range corresponding to the luminance level equal to or lower than the maximum luminance level of the content is mapped to the EOTF domain for the SDR signal.
  • the HDR signal includes metadata called MAX_CLL (Maximum Content Light Level) that represents the maximum luminance of the content. The maximum brightness of the content can be specified by referring to this metadata.
  • the maximum intensity level of the content is the intensity level of a particular pixel of a particular frame of a particular scene. Therefore, in frames other than this specific frame or scenes other than this specific scene, gradation values that are not actually used are mapped to the domain of the EDR for the SDR signal. That is, in the method of mapping the range corresponding to the luminance level equal to or lower than the maximum luminance level of the content in the EOTF definition area for the HDR signal to the EOTF definition area for the SDR signal, There is room to further suppress the degeneracy of the regulation.
  • the present invention has been made in view of the above problems, and an object thereof is a gradation value conversion device for converting gradation values of an HDR signal, wherein degeneration of gradation values that may occur in a low luminance region To realize the gradation value conversion device further suppressed.
  • a video processing apparatus converts the gradation value taken by each pixel in a video signal according to a second video format having a wider luminance range than the first video format.
  • Image processing apparatus wherein a virtual maximum luminance level not exceeding the maximum luminance level indicated by the metadata included in the video signal is set by referring to the gradation value taken by each pixel in the video signal.
  • a luminance level setting unit and, among the gradation values taken by each pixel in the video signal, the gradation values corresponding to the respective luminance levels below the virtual maximum luminance level are converted to be larger than the virtual maximum luminance level and And a tone value conversion unit for converting a tone value corresponding to each brightness level lower than the maximum brightness level into a value higher than the brightness value corresponding to the virtual maximum brightness level.
  • a video processing method is a video processing method for converting a gradation value taken by each pixel in a video signal according to a second video format having a wider luminance range than the first video format.
  • Virtual maximum luminance level setting step of setting a virtual maximum luminance level not exceeding the maximum luminance level indicated by the metadata included in the video signal by referring to the gradation value taken by each pixel in the video signal;
  • the gradation values corresponding to each luminance level equal to or lower than the virtual maximum luminance level are converted to be larger than the virtual maximum luminance level and equal to or lower than the maximum luminance level
  • a tone value conversion step of converting the tone value corresponding to the brightness level into a value equal to or greater than the brightness value corresponding to the virtual maximum brightness level.
  • a gradation value conversion device in which degeneration of gradation values that may occur in a low luminance region is further suppressed.
  • Embodiment 1 (Display 1) A display device 1 provided with a gradation value conversion device (video processing device) 2 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
  • FIG. FIG. 1 is a block diagram showing a configuration of a display device 1 provided with a tone value conversion device 2 according to the present embodiment.
  • FIG. 2 is a perspective view showing the appearance of the display device 1. As shown in FIG. 1, the display device 1 includes a gradation value conversion device 2, a panel control unit 6, and a display panel 7.
  • the gradation value conversion device 2 is a device for converting the gradation value of each pixel of the HDR signal (video signal according to the second video format), and the video data acquisition unit 3, virtual maximum luminance level setting unit 4, and floor A tuning conversion unit 5 is provided.
  • the video data acquisition unit 3 acquires an HDR signal.
  • the HDR signal acquired by the video data acquisition unit 3 is an HDMI signal based on the HDMI (registered trademark) (High-Definition Multimedia Interface) standard, a Tuner signal (a signal received by the tuner), and a CVBS. (Composite Video, Blanking, and Sync: composite video signal) signals and the like.
  • the HDR signal is also included as metadata such as MAX_CLL indicating the maximum luminance level of the content, in addition to the gradation value taken by each pixel.
  • the virtual maximum luminance level setting unit 4 refers to the gradation value or metadata included in the HDR signal acquired by the video data acquisition unit 3 and sets the virtual maximum luminance level smaller than the maximum luminance level indicated by MAX_CLL for each frame Or set for each scene.
  • the gradation value conversion unit 5 refers to the virtual maximum luminance level set by the virtual maximum luminance level setting unit 4 and determines the gradation value to be taken by each pixel in the HDR signal from the first gradation value to the second gradation.
  • the gradation value conversion unit 5 selects the gradation value corresponding to each luminance level equal to or lower than the virtual maximum luminance level set by the virtual maximum luminance level setting unit 4 among the gradation values that each pixel can take in the HDR signal. Is used to correspond to each gradation value in the definition area of the EOTF for the SDR signal (video signal according to the first video format).
  • the panel control unit 6 controls the luminance of each pixel of the display panel 7 to a luminance value corresponding to the gradation value obtained by the gradation value conversion unit 5 in the SDR EOTF. As a result, the video represented by the HDR signal is displayed on the display panel 7 at the original luminance.
  • the display panel 7 may be realized by any device capable of displaying an image, but as a specific example, a liquid crystal display, an organic EL (Electro Luminescence) display, a plasma display, etc. Can be mentioned.
  • FIG. 3 is a flowchart showing the flow of tone conversion processing.
  • FIG. 4 is a graph showing the contents of tone conversion processing.
  • the tone value conversion device 2 executes the steps S0 to S4 described below for each frame to obtain the tone value of each pixel constituting the HDR signal from the first tone value. Convert to the second tone value.
  • the video data acquisition unit 3 acquires an HDR signal (step S0).
  • the video data acquisition unit 3 supplies, to the virtual maximum luminance level setting unit 4 and the gradation value conversion unit 5, the gradation value taken by each of the pixels constituting the processing target frame in the acquired HDR signal.
  • the virtual maximum luminance level setting unit 4 acquires, from the video data acquisition unit 3, the gradation value to be taken by each pixel constituting the processing target frame, and acquires the maximum value of the acquired gradation values (maximum gradation value in frame) ) Is set as the virtual maximum luminance level (step S1).
  • FIG. 4A shows the correspondence (OETF) between the luminance value and the gradation value in the HDR signal.
  • the in-frame maximum luminance value corresponding to the in-frame maximum gradation value is lower than the maximum luminance level of the content indicated by MAX_CLL. Therefore, the virtual maximum brightness level set in this step is lower than the maximum brightness level of the content indicated by MAC_CLL.
  • the virtual maximum brightness level setting unit 4 supplies the set virtual maximum brightness level to the tone value conversion unit 5.
  • the gradation value conversion unit 5 acquires, from the video data acquisition unit 3, the gradation value to be taken by each of the pixels constituting the processing target frame, and the acquired gradation value from the first gradation value to the second. It converts into a gradation value (step S2). For this conversion, the gradation value conversion unit 5 acquires the virtual maximum luminance level from the virtual maximum luminance level setting unit 4, and among the gradation values that each pixel can take for the HDR signal, the acquired virtual maximum luminance A mapping is used in which the gradation value x corresponding to each luminance level y below the level is made to correspond to each gradation value X in the EOTF definition area for the SDR signal.
  • MAX_y represents a virtual maximum luminance level
  • MAX_Y represents a maximum value (corresponding to a maximum luminance level of a display device) of a range of EOTF for SDR signal.
  • (B) in FIG. 4 is a graph showing the relationship between the luminance value x before conversion and the gradation value y (OETF for HDR signal), and (c) in FIG. It is a graph showing the relationship with gradation value Y (OETF for SDR signal).
  • the tone value conversion unit 5 supplies, to the panel control unit 6, the tone value after conversion which each pixel constituting the processing target frame takes.
  • the panel control unit 6 acquires, from the gradation value conversion unit 5, gradation values after conversion which each pixel constituting the processing target frame takes, and converts the acquired gradation values into luminance values (step S3). ).
  • the panel control unit 6 uses an EDR for SDR, for example, an EOTF equivalent to ⁇ 2.2. This conversion is also called tone mapping, and the correspondence between tone values and luminance values in this conversion is also called tone curve.
  • the panel control unit 6 controls the luminance of each pixel constituting the display panel 7 to the luminance value obtained by tone mapping. As a result, the processing target frame is displayed on the display panel 7 (step S4).
  • the range corresponding to the luminance value equal to or lower than the virtual maximum luminance level in the domain of EOTF for HDR signal is defined as the domain of EOTF for SDR signal.
  • Use mapping to correspond Since the virtual maximum brightness level is lower than the maximum brightness level indicated by MAC_CLL, the definition of the EOTF for SDR signal in the range corresponding to the brightness value equal to or less than the maximum brightness level indicated by MAX_CLL within the definition area of EOTF for HDR signal In comparison with the case of using the mapping corresponding to the area, it is possible to suppress the black crushing and the gradation value degeneration.
  • the gradation value conversion process is performed for every frame, and the intra-frame maximum luminance value of each frame is set as the virtual maximum luminance level
  • the present embodiment is not limited to this.
  • tone value conversion processing is performed for each scene, and the in-scene maximum luminance value of each scene (the in-frame maximum of all the frames constituting that scene).
  • the maximum value of the luminance values is the virtual maximum luminance level. In this case, before starting the tone value conversion of the first frame constituting the processing target scene, the gradation values taken by the pixels constituting all the frames constituting the processing target scene are acquired, and the maximum luminance value in the scene is obtained.
  • the virtual maximum luminance level is set with reference to this metadata. With such a configuration, it is possible to perform gradation value conversion processing not only on the HDR signal recorded in the recorder or the like but also on the HDR signal received by the tuner or the like.
  • an arrangement may be adopted in which the temporal average value of the intra-frame maximum luminance values of each frame is set as the virtual maximum luminance level.
  • the temporal average value of the intra-frame maximum luminance values of each frame is set as the virtual maximum luminance level.
  • a well-known time average filter may be used to calculate the time average value of the in-frame luminance value of each frame.
  • step S1 the virtual maximum luminance level setting unit 4 sets the luminance value (in-frame maximum luminance value) or the luminance value corresponding to the acquired maximum value of the gradation values (maximum in-frame gradation value or in-scene maximum gradation value).
  • the configuration for setting the in-scene maximum luminance value) to the virtual maximum luminance level has been described.
  • the virtual maximum brightness level set by the virtual maximum brightness level setting unit 4 in step S1 is not limited to the in-frame maximum brightness value or the in-scene maximum brightness value. More specifically, the virtual maximum brightness level set by the virtual maximum brightness level setting unit 4 may be a value that does not exceed the maximum brightness level (MAX_CLL) indicated by the metadata included in the video signal.
  • MAX_CLL maximum brightness level
  • step S1 the virtual maximum brightness level setting unit 4 sets the virtual maximum brightness level to a brightness value lower than the in-frame maximum brightness value or the in-scene maximum brightness value.
  • step S3 the panel control unit 6 converts the gradation value acquired from the gradation value conversion unit 5 into a luminance value as described above.
  • the gradation values corresponding to the respective luminance levels larger than the virtual maximum luminance level and lower than the maximum luminance level (MAX_CLL) are Convert to a value greater than the luminance value corresponding to the virtual maximum luminance level.
  • step S4 the panel control unit 6 controls the luminance of each pixel constituting the display panel 7 to a luminance value obtained by tone mapping or a value greater than or equal to the luminance value corresponding to the virtual maximum luminance level.
  • FIG. (A) and (b) of FIG. 5 are graphs showing the relationship between the luminance value X and the gradation value Y after the conversion of step S2 (partly, the OETF for the SDR signal).
  • the panel control unit 6 sets each of the luminance values larger than the virtual maximum luminance level and lower than the maximum luminance level (MAX_CLL) among the gradation values acquired by the video data acquisition unit 3 in step S0.
  • the gradation value corresponding to the level may be regarded as a constant gradation value as shown in FIG. 5A, and may be converted into a constant luminance value corresponding to the virtual maximum luminance level.
  • the gradation value corresponding to each luminance level larger than the virtual maximum luminance level and lower than the maximum luminance level (MAX_CLL) is converted to a constant luminance value, and thus the image displayed by the converted luminance value
  • the effect is obtained that the gradation expression of the gradation value before conversion is not greatly impaired.
  • step S3 the panel control unit 6 determines that the gradation value acquired by the video data acquisition unit 3 in step S0 is greater than the virtual maximum luminance level and not higher than the maximum luminance level (MAX_CLL). Assuming that the gradation value corresponding to each luminance level gradually increases as the luminance value increases as (b) in FIG. 5 shows, the luminance value corresponding to the virtual maximum luminance level is equal to or higher than It may be converted to the value of As a result, in step S3, in the graph of the gradation value before conversion and the luminance value after conversion, panel control unit 6 gradually increases the luminance value after conversion as the gradation value before conversion increases.
  • MAX_CLL maximum luminance level
  • the gradation values corresponding to the luminance levels larger than the virtual maximum luminance level and lower than the maximum luminance level correspond to the virtual maximum luminance level so as to be larger. Convert to a value greater than the luminance value.
  • the size of the luminance value after conversion is a value according to the size of the gradation value before conversion, so that even in the image displayed with the luminance value after conversion, the floor of the gradation value before conversion is An effect is obtained that the tone expression is not significantly impaired.
  • the same configuration as the above-described configuration can be adopted even when the in-frame maximum luminance value or the in-scene maximum luminance value exceeds MAX_CLL.
  • the panel control unit 6 determines that the gradation value acquired by the video data acquisition unit 3 in step S0 is greater than the virtual maximum luminance level and is the maximum luminance value in the frame or the maximum in the scene.
  • the gradation value corresponding to each luminance level lower than the luminance value may be converted to a value higher than the luminance value corresponding to the virtual maximum luminance level.
  • the display device 1 including the tone value conversion device 2 shown in FIG. 1 is used as in the first embodiment.
  • FIG. 6 is a flowchart showing the flow of tone value conversion processing executed by the tone value conversion device 2 according to the present embodiment. Detailed descriptions of steps similar to those of the image processing method according to the first embodiment will be omitted.
  • step S10 the video data acquisition unit 3 acquires an HDR signal (step S0).
  • step S11 the virtual maximum luminance level setting unit 4 generates a histogram of luminance values corresponding to the gradation values taken by each of the pixels constituting the processing target frame, and obtains the histogram maximum value from the generated histogram.
  • the histogram maximum value here will be described later.
  • step S12 the virtual maximum brightness level setting unit 4 sets the virtual maximum brightness level to the histogram maximum value obtained in step S11.
  • the gradation value conversion unit 5 sets the virtual maximum luminance level (virtual maximum luminance level setting unit) among the gradation values (obtained from the video data acquisition unit 3) that each pixel can take for the HDR signal. 4) to convert the gradation value corresponding to each luminance level below into each gradation value within the definition range of the EDR for the SDR signal.
  • step S14 the panel control unit 6 adds the step of converting the gradation value acquired from the gradation value conversion unit 5 into the luminance value as in step S3 described above, and the video data acquisition unit 3 performs the step.
  • the gradation values acquired in S10 are the luminance values corresponding to the virtual maximum luminance level or more. Convert to a value
  • step S14 panel control unit 6 sets the gradation value corresponding to each luminance level larger than the virtual maximum luminance level and lower than the maximum luminance level (MAX_CLL) to the luminance corresponding to the virtual maximum luminance level. It may be converted to a value (constant luminance value). Further, in the graph of the gradation value before conversion and the luminance value after conversion, the panel control unit 6 causes the luminance value after conversion to gradually increase as the gradation value before conversion increases. The gradation value corresponding to each luminance level larger than the virtual maximum luminance level and lower than the maximum luminance level (MAX_CLL) may be converted to a value larger than the luminance value corresponding to the virtual maximum luminance level.
  • MAX_CLL maximum luminance level
  • the panel control unit 6 determines whether the image data acquisition unit 3 acquires the gradation value acquired in step S10. Among them, the gray level value corresponding to each brightness level larger than the virtual maximum brightness level (hist maximum value) and smaller than the in-frame maximum brightness value or the in-scene maximum brightness value is the brightness value corresponding to the virtual maximum brightness level. It may be converted to the above values.
  • step S15 panel control unit 6 corresponds the luminance of each pixel constituting display panel 7 to the luminance value obtained by tone mapping in step S14 or the virtual maximum luminance level. Control to a value greater than the luminance value.
  • the above-described histogram maximum value is the maximum value of the luminance values excluding specifically large luminance values among the luminance values corresponding to the gradation values taken by the pixels constituting the processing target frame, and the average value of the histogram It is an amount that can be calculated from the value M and the standard deviation ⁇ .
  • M + 3 ⁇ is a typical example of the histogram maximum.
  • FIG. 7 An example of the histogram generated in step S11 is shown in FIG.
  • some pixels have a uniquely large luminance value close to the maximum luminance level indicated by MAX_CLL.
  • the gradation value conversion step The area between the specifically large luminance value and the maximum value of the luminance values excluding the specifically large luminance value in S13 is uselessly associated with the range of the EDR for SDR.
  • the histogram maximum value of the luminance value corresponding to the gradation value taken by the pixels constituting the processing target frame is set as the virtual maximum luminance level, the luminance value excluding the specifically large luminance value In the tone value conversion step S13, the value range of the SDR EOTF can be associated without waste.
  • a configuration has been described in which a histogram of luminance values is created for each frame, and the intra-frame histogram maximum value of each frame is set as the virtual maximum luminance level, but the present embodiment is not limited to this.
  • a histogram of luminance values is executed for each scene and the in-scene histogram maximum value of each scene is a virtual maximum luminance level. It is.
  • a histogram of luminance values corresponding to the tone values taken by pixels making up all the frames making up the processing target scene is created And set the in-scene histogram maximum value to the virtual maximum luminance level.
  • the metadata indicating the in-scene histogram maximum value of each scene is included in the HDR signal, it is also possible to adopt a configuration in which the virtual maximum luminance level is set with reference to this metadata. With such a configuration, it is possible to perform gradation value conversion processing not only on the HDR signal recorded in the recorder or the like but also on the HDR signal received by the tuner or the like.
  • the intra-frame intra-histo maximum value of each frame may be temporally averaged to be the virtual maximum luminance level.
  • a well-known time average filter or the like may be used to calculate the time average value of the in-frame maximum values of the respective frames.
  • the display device 1 including the tone value conversion device 2 shown in FIG. 1 is used as in the first embodiment.
  • FIG. 8 is a flowchart showing the flow of tone value conversion processing executed by the tone value conversion device according to the present embodiment. Detailed descriptions of steps similar to those of the image processing method according to the first embodiment will be omitted.
  • step S100 the video data acquisition unit 3 acquires an HDR signal (step S0).
  • step S101 the virtual maximum luminance level setting unit 4 generates a histogram of luminance values corresponding to the gradation value taken by each pixel constituting the processing target frame, and obtains the histogram maximum value from the generated histogram.
  • the definition of the histogram maximum is similar to that given in the second embodiment.
  • the virtual maximum brightness level setting unit 4 sets a limit value lower by a predetermined value than the maximum brightness level indicated by MAC_CLL.
  • the predetermined value is an arbitrary value, and may be set at the time of factory shipment, or may be set by the user after factory shipment.
  • step S103 the virtual maximum luminance level setting unit 4 determines whether the histogram maximum value calculated in step S101 is lower than the limit value calculated in step S102.
  • the virtual maximum brightness level setting unit 4 sets the virtual maximum brightness level as the limit value (step S104). If the histogram maximum value is equal to or more than the limit value, the virtual maximum luminance level setting unit 4 sets the virtual maximum luminance level to the histogram maximum value (step S105).
  • the gradation value conversion unit 5 sets the virtual maximum luminance level (limit value) among the gradation values (obtained from the video data acquisition unit 3) that each pixel can take for the HDR signal.
  • the gradation value corresponding to each luminance level lower than the maximum value of the histogram is converted into each gradation value within the definition range of the EDR for the SDR signal (step S106).
  • step S107 the panel control unit 6 adds the step of converting the gradation value acquired from the gradation value conversion unit 5 into the luminance value as in step S3 described above, and the video data acquisition unit 3 performs the step.
  • the gradation value corresponding to each luminance level larger than the virtual maximum luminance level (limit value or maximum value of the histogram) and lower than the maximum luminance level (MAX_CLL) among the gradation values acquired in S100 is the virtual maximum luminance. Convert to a value greater than the luminance value corresponding to the level.
  • step S107 panel control unit 6 sets the gradation value corresponding to each luminance level larger than the virtual maximum luminance level (limit value or maximum value of the histogram) and not higher than the maximum luminance level (MAX_CLL). It may be converted to a luminance value (constant luminance value) corresponding to the virtual maximum luminance level. Further, in the graph of the gradation value before conversion and the luminance value after conversion, the panel control unit 6 causes the luminance value after conversion to gradually increase as the gradation value before conversion increases.
  • step S107 the panel control unit 6 determines whether the image data acquisition unit 3 acquires the gradation value acquired in step S100.
  • the gradation value corresponding to each luminance level which is larger than the virtual maximum luminance level (limit value or the maximum histogram value) and smaller than the in-frame maximum luminance value or the in-scene maximum luminance value corresponds to the virtual maximum luminance level. You may convert into the value more than the brightness value to be.
  • step S108 the panel control unit 6 corresponds the luminance of each pixel constituting the display panel 7 to the luminance value obtained by tone mapping in step S107 or the virtual maximum luminance level. Control to a value greater than the luminance value.
  • FIG. (A) and (c) in FIG. 9 show histograms of luminance values corresponding to the gradation values taken by the pixels constituting the processing target frame, and (b) and (d) in FIG. It is a graph showing the relationship between the luminance value X after conversion and the gradation value Y (OETF for SDR signal).
  • the virtual maximum brightness level setting unit 4 sets the virtual maximum brightness level to the limit value. In this case, as shown in (b) of FIG.
  • step S106 a range equal to or less than the limit value in the domain of the OETF for HDR signal is mapped to the entire domain of the OETF for SDR signal. Note that the process of step S107 described above is performed for the gradation value in the range larger than the limit value in the definition area of the OETF for the HDR signal.
  • step S105 when the histogram maximum value is equal to or more than the limit value, the virtual maximum luminance level setting unit 4 sets the virtual maximum luminance level to the histogram maximum value in step S105.
  • step S106 a range equal to or less than the maximum value of the histogram is mapped to the entire range of the EDRF for SDR in the range of EOTF for HDR signal. Note that the process of step S107 described above is performed for the gradation value in the range larger than the maximum value of the histogram within the range of the EOTF for the HDR signal.
  • the virtual maximum luminance can be generated when the histogram maximum value becomes extremely small by providing the limit value to the virtual maximum luminance level It is possible to prevent the deterioration of the image quality caused by the large fluctuation of the level.
  • Embodiment 4 The fourth embodiment of the present invention is described below with reference to the drawings.
  • the display device 1 including the tone value conversion device 2 shown in FIG. 1 is used as in the first embodiment.
  • the flow of tone value conversion processing executed by the tone value conversion device 2 according to the present embodiment is the same as the tone conversion processing performed by the tone value conversion device 2 according to the third embodiment, as shown in FIG. It is expressed by the flowchart shown in FIG. However, in the present embodiment, the limit value setting process S102 in the third embodiment is replaced with the limit value setting process S109 described below.
  • step S109 the virtual maximum brightness level setting unit 4 sets a predetermined ratio between the difference obtained by subtracting the limit value from the maximum brightness level indicated by MAX_CLL and the difference obtained by subtracting the maximum value of the histogram in the brightness histogram from the limit value.
  • the predetermined ratio is an arbitrary ratio, and may be set at the time of factory shipment, or may be set by the user after factory shipment.
  • step S104 when the histogram maximum value is lower than the limit value, the virtual maximum luminance level setting unit 4 sets the virtual maximum luminance level to the limit value in step S104.
  • step S106 a range equal to or less than the limit value in the domain of the OETF for HDR signal is mapped to the entire domain of the OETF for SDR signal. Note that the process of step S107 described above is performed for the gradation value in the range larger than the limit value in the definition area of the OETF for the HDR signal.
  • the virtual maximum luminance level setting unit 4 sets the virtual maximum luminance level to the histogram maximum value in step S105.
  • the range of the EOTF for the HDR signal in the range of the EOTF for the HDR signal, the range equal to or less than the maximum value of the histogram is mapped to the entire range of the EDR for the SDR signal. Note that the process of step S107 described above is performed for the gradation value in the range larger than the maximum value of the histogram within the range of the EOTF for the HDR signal.
  • the virtual maximum luminance can be generated when the histogram maximum value becomes extremely small by providing the limit value to the virtual maximum luminance level It is possible to prevent the deterioration of the image quality caused by the large fluctuation of the level.
  • the luminance value (maximum luminance value in a frame) corresponding to the maximum value (maximum gradation value in a frame) of the gradation value taken by each pixel constituting the processing target frame by the virtual maximum luminance level setting unit 4 Is described to set the virtual maximum brightness level. According to this configuration, it is possible to convert the gradation value according to the peak luminance which is the greatest advantage of HDR.
  • the tone value conversion device 11 converts the tone values of the low tone value region among the tone values converted by the tone value conversion unit 5.
  • the gradation value taken by each pixel constituting each frame or each scene in the video signal is adjusted so as to have a lifting portion.
  • the low gradation value area indicates a gradation value area near the origin (a point at which the gradation value and the corresponding luminance value are zero) in the converted gradation value.
  • the low gradation value area indicates an area of about one-fifth the gradation value when the gradation value is quantized with 8 bits (256 gradations (0 to 255)). (Area in which the gradation value is 0 to 51).
  • the area of the gradation value having the gradation value larger than the largest gradation value in the low gradation value area as the lowest gradation value is taken as the middle gradation value area, and the largest floor in the middle gradation value area.
  • a region of tone values having a tone value larger than a tone value as the lowest tone value is defined as a high tone value region.
  • “having a lifting portion in the gradation value of the low gradation value region” means the low floor caused by converting the gradation value by the gradation value conversion method described in the first embodiment. It means raising the tone value of the low tone region to improve the relative drop (blackout) of the tone value of the tone value region.
  • FIG. 11 is a block diagram showing a configuration of a display device 10 provided with the gradation value conversion device (video processing device) 11 according to the present embodiment. As shown in FIG. 11, the gradation value conversion device 11 further includes a gradation value adjustment unit 12 in addition to the configuration of the gradation value conversion device 2 according to the first embodiment.
  • the gradation value adjustment unit 12 adjusts the gradation value of the low gradation value region to have a lifting part among the gradation values converted by the gradation value conversion unit 5.
  • FIG. 12 is a flowchart showing the flow of tone value conversion processing.
  • the gradation value conversion process is performed for each frame and the maximum luminance value in each frame is set as the virtual maximum luminance level, the gradation value conversion process is performed for each scene, The same applies to a configuration in which the in-scene maximum luminance value of each scene is set as the virtual maximum luminance level.
  • the video data acquisition unit 3 acquires the HDR signal (step S20).
  • the video data acquisition unit 3 sets the gradation value taken by each pixel constituting the processing target frame in the acquired HDR signal to the virtual maximum luminance level setting unit 4 and the gradation value converter 5.
  • the virtual maximum luminance level setting unit 4 acquires, from the video data acquisition unit 3, the gradation value to be taken by each pixel constituting the processing target frame, and acquires the maximum value of the acquired gradation values (maximum gradation value in frame) ) Is set as the virtual maximum luminance level (step S21).
  • the gradation value conversion unit 5 acquires, from the video data acquisition unit 3, the gradation value to be taken by each pixel constituting the processing target frame, and among the acquired gradation values, the virtual maximum luminance level setting unit 4 The gradation value corresponding to each luminance level lower than the set virtual maximum luminance level is converted from the first gradation value to the second gradation value (step S22).
  • the gradation value adjustment unit 12 adjusts the gradation value of the low gradation value region to have a lifting part among the gradation values converted by the gradation value conversion unit 5 (step S23).
  • a specific example of the method of adjusting the gradation value by the gradation value adjustment unit 12 will be described later.
  • the tone value adjusted by the tone value adjusting unit 12 is preferably larger in the low tone value region than the tone value indicated by the predetermined format.
  • ST2084 can be mentioned.
  • the panel control unit 6 acquires, from the gradation value adjustment unit 12, the adjusted gradation values taken by the pixels constituting the processing target frame, and converts the acquired gradation values into luminance values (step S24). ) (Tone mapping).
  • the panel control unit 6 controls the luminance of each pixel constituting the display panel 7 to the luminance value obtained by tone mapping. As a result, the processing target frame is displayed on the display panel 7 (step S25).
  • FIG. 13 is a graph showing the relationship between the gradation value after conversion in step S22 and the corresponding luminance value.
  • Region A in FIG. 13 indicates the above-described low gradation value region, the dotted line indicates a curve before adjustment, and the solid line indicates a curve after adjustment.
  • the gradation value adjustment unit 12 adjusts the gradation value after conversion so that the gradation value in the region A has a lifting part (adjusts from a dotted curve to a solid curve).
  • the gradation value adjustment unit 12 adjusts the gradation value of the low gradation value region by adding a value of about 10% of the gradation value.
  • the gradation value to be adjusted is a gradation value according to ST2084
  • the gradation value adjustment unit 12 graphs the gradation value corresponding to the gradation value and the luminance value corresponding to the gradation value in the low gradation value region. If so, the curve in the graph is adjusted to be equal to the curve of ⁇ 2.2.
  • the gradation value adjustment unit 12 may change the low gradation value region with reference to the average value of the luminance levels corresponding to the gradation value converted by the gradation value conversion unit 5.
  • the low gradation value region can be set in accordance with the distribution of the luminance levels, so that the gradation values can be adjusted in accordance with the distribution of the luminance levels.
  • the average value of the luminance levels to which the tone value adjusting unit 12 refers may be calculated by the tone value adjusting unit 12 itself, or may be obtained from the outside.
  • the gradation value adjustment unit 12 also calculates the gradation value of the low gradation value region and the gradation value of the high gradation value region.
  • the tone values of the middle tone value region may be further adjusted so that.
  • step S21 the virtual maximum brightness level setting unit 4 sets the brightness value (maximum brightness value in a frame) corresponding to the maximum value of the acquired tone values (maximum tone value in a frame) to the virtual maximum brightness level.
  • Configuration has been described.
  • the virtual maximum brightness level set by the virtual maximum brightness level setting unit 4 in step S21 is not limited to the in-frame maximum brightness value.
  • the virtual maximum brightness level set by the virtual maximum brightness level setting unit 4 may be a value that does not exceed the maximum brightness level (MAX_CLL) indicated by the metadata included in the video signal. And each process in such composition is the same as each process explained by the modification of Embodiment 1.
  • step S24 the panel control unit 6 adds the gradation value adjusted by the gradation value adjustment unit 12 in step S23 to the luminance value, and the video data acquisition unit 3 performs the step.
  • the gradation values corresponding to each luminance level larger than the virtual maximum luminance level and lower than the maximum luminance level are the luminance values corresponding to the virtual maximum luminance level or more.
  • the panel control unit 6 sets each of the steps to a specific example, which is larger than the virtual maximum luminance level and lower than the maximum luminance level (MAX_CLL).
  • the gradation value corresponding to the luminance level may be converted into a luminance value (constant luminance value) corresponding to the virtual maximum luminance level. Further, in the graph of the gradation value before conversion and the luminance value after conversion, the panel control unit 6 causes the luminance value after conversion to gradually increase as the gradation value before conversion increases.
  • the gradation value corresponding to each luminance level larger than the virtual maximum luminance level and lower than the maximum luminance level (MAX_CLL) may be converted to a value larger than the luminance value corresponding to the virtual maximum luminance level.
  • the tone value conversion device 11 sets the virtual maximum brightness level to the maximum value of the brightness level, converts the tone value with reference to the set virtual maximum brightness level, Among the converted tone values, the tone value in the low tone value region is adjusted to have a lifting portion.
  • the tone value of the region By setting the virtual maximum luminance level to the maximum value of the luminance level, the fidelity of the peak feeling included in the video signal can be maintained, and the low gradation value among the converted gradation values can be maintained.
  • By adjusting the tone value of the region to have a raised portion it is possible to prevent blackout due to the decrease of the tone value of the low tone value region and improve the tone expression power of the low tone value region. .
  • the control block (in particular, the video data acquisition unit 3, the virtual maximum luminance level setting unit 4 and the gradation value conversion unit 5) of the gradation value conversion device 2 is a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like. And may be realized by software using a CPU (Central Processing Unit).
  • a CPU Central Processing Unit
  • the gradation value conversion device 2 is a CPU that executes instructions of a program that is software that realizes each function, a ROM (Read Only) in which the program and various data are readably recorded by a computer (or CPU). Memory or storage device (these are referred to as “recording media”), and RAM (Random Access Memory) for developing the program.
  • the object of the present invention is achieved by the computer (or CPU) reading the program from the recording medium and executing the program.
  • the recording medium a “non-transitory tangible medium”, for example, 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 any transmission medium (communication network, broadcast wave, etc.) capable of transmitting 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.
  • a video processing apparatus (2, 11) according to aspect 1 of the present invention is a video processing apparatus that converts a gradation value taken by each pixel in a video signal according to a second video format wider in luminance range than the first video format. And a virtual maximum brightness level setting unit that sets a virtual maximum brightness level not exceeding the maximum brightness level indicated by the metadata included in the video signal by referring to the gray scale value taken by each pixel in the video signal.
  • the gradation values corresponding to each luminance level below the virtual maximum luminance level are converted, and are larger than the virtual maximum luminance level, and And a gradation value conversion unit (5) for converting the gradation value corresponding to each luminance level lower than the maximum luminance level into a value higher than the luminance value corresponding to the virtual maximum luminance level.
  • the gradation value conversion unit determines whether the gradation value of each pixel in the image signal is higher than the virtual maximum luminance level A gradation value corresponding to each luminance level which is large and equal to or less than the maximum luminance level may be converted into a luminance value corresponding to the virtual maximum luminance level.
  • the gradation value corresponding to each luminance level larger than the virtual maximum luminance level and lower than the maximum luminance level is converted to a constant luminance value, the luminance values after conversion are displayed. Also in the image, the gradation expression of the gradation value before conversion is not significantly impaired.
  • the gradation value conversion unit is configured to generate the gradation value before conversion and the luminance value after conversion before the conversion.
  • the gradation value of each pixel in the video signal is larger than the virtual maximum luminance level and the maximum luminance level so that the luminance value after conversion gradually increases as the gradation value of the pixel increases.
  • the gradation values corresponding to the following luminance levels may be converted to values equal to or higher than the luminance value corresponding to the virtual maximum luminance level.
  • the size of the luminance value after conversion is a value corresponding to the size of the gradation value before conversion, so even in the image displayed with the luminance value after conversion, the floor before conversion is Do not significantly reduce the tone expression of the key value.
  • the gradation value conversion unit (5) takes each pixel in a second video format according to the video signal.
  • the image It converts the gradation value that each pixel takes in the signal.
  • the display quality of the video can be further improved.
  • the first video format is a format in which the EOTF is equivalent to ⁇ 2.2
  • the second video format is the EOTF Is a format that is SMPTE-ST2084.
  • the virtual maximum luminance level setting unit is a floor taken by each pixel constituting each frame or each scene in the video signal.
  • the virtual maximum luminance level is set by referring to the adjustment value.
  • the virtual maximum luminance level setting unit (4) determines that the virtual maximum luminance level corresponds to each frame or each scene in the video signal. Are set to the maximum value of the luminance level corresponding to the gradation value to be taken by each of the pixels constituting the image.
  • the gradation value in the low gradation value region has a lifting portion.
  • a tone value adjustment unit (12) for adjusting the image in the above-mentioned aspect 7, among the gradation values converted by the gradation value conversion section, the gradation value in the low gradation value region has a lifting portion. And a tone value adjustment unit (12) for adjusting the image.
  • the gradation value adjustment unit refers to the average value of the luminance levels corresponding to the gradation value converted by the gradation value conversion unit. Then, the low gradation value area is changed.
  • the low gradation value region can be set according to the distribution of the luminance level, it becomes possible to adjust the gradation value according to the distribution of the luminance level.
  • the gradation value adjustment unit is a graph of the gradation value converted by the gradation value conversion unit and the corresponding luminance level.
  • the tone values in the middle tone value area are further adjusted so that the tone values in the low tone value area and the tone values in the high tone value area change continuously.
  • the gradation value adjusted by the gradation value adjustment unit is the second image format in the low gradation value region. Greater than the indicated tone value.
  • the video image conversion device of the above aspects 8 to 10 can be suitably used.
  • the virtual maximum luminance level setting unit (4) takes each pixel constituting each frame or each scene in the video signal. A histogram of luminance levels corresponding to gradation values is created, and the virtual maximum luminance level is set by referring to the histogram.
  • the virtual maximum luminance level setting unit (4) configures each frame or each scene in the video signal with the virtual maximum luminance level.
  • the effective maximum value of the luminance level corresponding to the gradation value taken by each pixel is set to the effective maximum value defined by a constant multiple of the standard deviation of the histogram.
  • the virtual maximum luminance level setting unit (4) sets a limit value lower than the maximum luminance level by a predetermined value, and the video signal
  • the effective maximum value of the luminance level corresponding to the gradation value taken by each pixel constituting each frame or each scene in the image, and the effective maximum value defined by a constant multiple of the standard deviation of the histogram is higher than the limit value If it is low, the virtual maximum brightness level is set to the value of the limit value, and if the effective maximum value is equal to or more than the limit value, the virtual maximum brightness level is set to the effective maximum value.
  • the virtual maximum luminance level setting unit (4) is a difference obtained by subtracting the limit value from the maximum luminance level.
  • the effective maximum value of the luminance level corresponding to the gradation value taken by each pixel constituting each frame or each scene in the video signal, which is defined by a constant multiple of the standard deviation of the histogram The virtual maximum luminance level is set to the value of the limit value when the effective maximum value is lower than the limit value, and the difference obtained by subtracting the difference from the value is a predetermined ratio, and the effective maximum value is set. Is greater than or equal to the limit value, the virtual maximum brightness level is set to the effective maximum value.
  • the limit value can be set to a desired value.
  • the virtual maximum luminance level setting unit determines that the virtual maximum luminance level corresponds to each frame or each pixel forming each scene in the video signal.
  • the effective maximum value of the luminance level corresponding to the gradation value to be taken is set to a time average value of the effective maximum value defined by a constant multiple of the standard deviation of the histogram.
  • the video quality can be improved.
  • the display device (1, 10) according to aspect 17 of the present invention includes the video processing device according to any one of the above aspects 1 to 16.
  • a video processing method is a video processing method for converting the gradation value taken by each pixel in a video signal according to a second video format having a wider luminance range than the first video format, Virtual maximum luminance level setting step of setting a virtual maximum luminance level not exceeding the maximum luminance level indicated by the metadata included in the video signal by referring to the gradation value taken by each pixel in the video signal; and the video signal
  • the gradation value corresponding to each luminance level below the virtual maximum luminance level among the gradation values taken by each pixel is converted, and each luminance level larger than the virtual maximum luminance level and below the maximum luminance level
  • a tone value conversion step of converting the tone value corresponding to ⁇ to a value greater than or equal to the brightness value corresponding to the virtual maximum brightness level.
  • the display device may be realized by a computer.
  • the display device is realized by the computer by operating the computer as each unit (software element) included in the display device.
  • a control program of a display device and a computer readable recording medium recording the same also fall within the scope of the present invention.
  • tone value adjustment unit 1
  • 10 display device 2 11 Tone value converter 3
  • Video data acquisition unit 4 Virtual Maximum Brightness Level Setting Unit 5 Tone value converter 6
  • Panel control unit 7 Display panel 12 tone value adjustment unit

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Abstract

La présente invention convertit efficacement, y compris dans un appareil d'affichage qui prend en charge un signal SDR, une caractéristique de gradation indiquée par un signal HDR en une caractéristique de gradation appropriée pour l'appareil d'affichage en vue d'améliorer la qualité d'affichage. Un dispositif de traitement vidéo (2) comprend : une unité de réglage de niveau de luminance maximal virtuel (4) qui règle un niveau de luminance maximal virtuel qui est inférieur ou égal au niveau de luminance maximal indiqué par des métadonnées incluses dans un signal vidéo ; et une unité de conversion de valeurs de gradation (5) qui convertit des valeurs de gradation correspondant à des niveaux de luminance respectifs inférieurs ou égaux au niveau de luminance maximal virtuel, parmi les valeurs de gradation adoptées par des pixels respectifs dans le signal vidéo.
PCT/JP2018/025554 2017-08-25 2018-07-05 Dispositif de traitement vidéo, appareil d'affichage, procédé de traitement vidéo, programme de commande, et support d'enregistrement Ceased WO2019039111A1 (fr)

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