WO2019119847A1 - 动态色调映射方法、移动终端及计算机可读存储介质 - Google Patents

动态色调映射方法、移动终端及计算机可读存储介质 Download PDF

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WO2019119847A1
WO2019119847A1 PCT/CN2018/102096 CN2018102096W WO2019119847A1 WO 2019119847 A1 WO2019119847 A1 WO 2019119847A1 CN 2018102096 W CN2018102096 W CN 2018102096W WO 2019119847 A1 WO2019119847 A1 WO 2019119847A1
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brightness information
tone mapping
average brightness
average
maximum
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PCT/CN2018/102096
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English (en)
French (fr)
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黄哲
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深圳创维－Rgb电子有限公司
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Priority to EP18891929.4A priority Critical patent/EP3561765B1/en
Publication of WO2019119847A1 publication Critical patent/WO2019119847A1/zh
Priority to US16/550,744 priority patent/US11145039B2/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/90—Dynamic range modification of images or parts thereof
    • G06T5/92—Dynamic range modification of images or parts thereof based on global image properties
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/90—Dynamic range modification of images or parts thereof
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/20—Image enhancement or restoration using local operators
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/50—Image enhancement or restoration using two or more images, e.g. averaging or subtraction
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/90—Determination of colour characteristics
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10016—Video; Image sequence
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10024—Color image
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/20—Special algorithmic details
    • G06T2207/20021—Dividing image into blocks, subimages or windows
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/20—Special algorithmic details
    • G06T2207/20172—Image enhancement details
    • G06T2207/20208—High dynamic range [HDR] image processing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G09G5/06—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed using colour palettes, e.g. look-up tables

Definitions

  • the present application relates to the field of high dynamic range image processing technologies, and in particular, to a dynamic tone mapping method, a mobile terminal, and a computer readable storage medium.
  • HDR video has a dynamic range of brightness that matches the brightness of the real scene. Based on the concept of HDR video production, the current brightness range of HDR10 video is about 0.001 ⁇ 1000 nits, and ST.2084 itself covers 0.000001 ⁇ 10000 nits, which means that HDR10 video will have very high hardware requirements.
  • the hardware brightness range cannot cover the video content, according to the concept of the HDR video, it is necessary to design a method of compressing the brightness by referring to the condition of the hardware itself.
  • the average brightness of each frame in the video cannot be consistent from beginning to end.
  • the compression of the brightness cannot be adjusted according to the change of the average brightness of the frame picture, resulting in waste of the dynamic range of the hardware and not showing the HDR effect well.
  • the main purpose of the present application is to provide a dynamic tone mapping method, a mobile terminal, and a computer readable storage medium, which are intended to solve the problem that the HDR10 video picture cannot be adjusted according to the change of the average brightness of the frame picture when playing in the HDR display terminal, resulting in hardware.
  • the waste of dynamic range does not show the technical problems of HDR effects.
  • the embodiment of the present application provides a dynamic tone mapping method, where the dynamic tone mapping method includes:
  • the tone mapping data set is called to perform tone mapping transformation on the frame picture to be displayed on the display terminal.
  • the step of acquiring the maximum brightness information and the average brightness information of the frame picture to be displayed by the display terminal includes:
  • the maximum sub-brightness information and the average sub-brightness information of each block are counted, and the maximum brightness information and the average brightness information of the frame picture to be displayed on the display terminal are calculated.
  • the step of searching for the tone mapping data set corresponding to the maximum brightness information and the average brightness information in the preset tone mapping lookup table comprises:
  • the debug Based on the dynamic range specification of the high dynamic range hardware, the debug generates a plurality of sets of tone mapping data sets of different dynamic ranges and different average brightnesses, stores the generated tone mapping data sets, and generates a tone mapping lookup table.
  • the step of searching for the tone mapping data set corresponding to the maximum brightness information and the average brightness information in the preset tone mapping lookup table further includes:
  • the tone mapping data group is called to perform a tone mapping conversion step on the frame picture to be displayed on the display terminal.
  • the method further includes:
  • the maximum brightness information and the average brightness information do not have a logical relationship with the tone mapping data set in the tone mapping lookup table, it is confirmed whether the maximum brightness information and the average brightness information can be the maximum brightness information and the average brightness information of the adjacent interval. replace.
  • the method further includes:
  • the maximum brightness information and the average brightness information are replaced by the maximum brightness information and the average brightness information of the adjacent sections in the tone mapping lookup table, then the maximum brightness information and the average brightness information after the replacement are searched for in the tone mapping lookup table. Corresponding tone mapping data set.
  • the method further includes:
  • the maximum brightness information and the average brightness information are stored in the tone mapping lookup table corresponding to the dynamic range and the average brightness information in the debugged new tone mapping data set.
  • the step of acquiring the maximum brightness information and the average brightness information of the frame picture to be displayed by the display terminal further includes:
  • the lag time for acquiring the maximum brightness information and the average brightness information is set based on hardware parameters of the display terminal, and after the lag time is separated, the maximum brightness information and the average brightness information are acquired.
  • the present application also provides a mobile terminal, the mobile terminal comprising: a memory, a processor, and a dynamic tone mapping program stored on the memory and operable on the processor, the dynamic tone mapping program being The steps of the dynamic tone mapping method described above are implemented when the processor executes.
  • the present application also provides a computer readable storage medium having a dynamic tone mapping program stored thereon, the dynamic tone mapping program being executed by a processor to implement the steps of the dynamic tone mapping method described above.
  • the present application obtains the maximum brightness information and the average brightness information of the frame to be displayed of the display terminal in real time, and searches the preset tone mapping lookup table for the tone mapping data group corresponding to the maximum brightness information and the average brightness information, and invokes the The tone mapping data group performs tone mapping transformation on the frame of the display terminal to be displayed, thereby changing the tone mapping data group in real time according to the maximum brightness information and the average brightness information of the frame image detected in real time, so as to achieve reasonable utilization of the hardware dynamic range and better Show HDR effects.
  • FIG. 1 is a schematic structural diagram of hardware of an optional mobile terminal implementing various embodiments of the present application
  • FIG. 2 is a schematic flowchart of an embodiment of a dynamic tone mapping method according to the present application
  • 3 is an effect diagram of performing tone mapping transformation on different brightness pictures by the same tone mapping data group in the dynamic tone mapping method of the present application
  • FIG. 4 is a rendering diagram of the tone mapping transformation of different luminance pictures by different tone mapping data sets according to the dynamic tone mapping method of the present application.
  • FIG. 1 is a schematic structural diagram of a terminal in a hardware operating environment involved in an embodiment of the present application.
  • the terminal in the embodiment of the present application may be a PC, or may be a smart phone, a tablet computer, an e-book reader, an MP3 (Moving Picture Experts Group Audio Layer III) player, and an MP4 (Moving Picture Experts). Group Audio Layer IV, dynamic video experts compress standard audio layers 3) Players, portable computers and other portable terminal devices with display functions.
  • the terminal may include a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002.
  • the communication bus 1002 is used to implement connection communication between these components.
  • the user interface 1003 can include a display, an input unit such as a keyboard, and the optional user interface 1003 can also include a standard wired interface, a wireless interface.
  • the network interface 1004 can optionally include a standard wired interface, a wireless interface (such as a WI-FI interface).
  • the memory 1005 may be a high speed RAM memory or a non-volatile memory such as a disk memory.
  • the memory 1005 can also optionally be a storage device independent of the aforementioned processor 1001.
  • the terminal may further include a camera, an RF (Radio Frequency) circuit, a sensor, an audio circuit, a WiFi module, and the like.
  • sensors such as light sensors, motion sensors, and other sensors.
  • the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display according to the brightness of the ambient light, and the proximity sensor may turn off the display and/or when the mobile terminal moves to the ear. Backlighting.
  • the gravity acceleration sensor can detect the magnitude of acceleration in each direction (usually three axes), and can detect the magnitude and direction of gravity when stationary, and can be used to identify the posture of the mobile terminal (such as horizontal and vertical screen switching, Related games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tapping), etc.; of course, the mobile terminal can also be equipped with other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor, etc. No longer.
  • terminal structure shown in FIG. 1 does not constitute a limitation to the terminal, and may include more or less components than those illustrated, or a combination of certain components, or different component arrangements.
  • an operating system may be included in the memory 1005 as a computer storage medium.
  • a network communication module may be included in the memory 1005 as a computer storage medium.
  • a user interface module may be included in the memory 1005 as a computer storage medium.
  • a dynamic tone mapping program may be included in the memory 1005 as a computer storage medium.
  • the network interface 1004 is mainly used to connect to the background server and perform data communication with the background server;
  • the user interface 1003 is mainly used to connect the client (user end), and perform data communication with the client;
  • the processor 1001 can be used to invoke a dynamic tone mapping program stored in memory 1005.
  • the present application provides a dynamic tone mapping method.
  • the method includes:
  • Step S10 Acquire maximum brightness information and average brightness information of a frame to be displayed on the display terminal;
  • the display terminal to be displayed frame screen is a picture of each frame of the HDR10 video to be tone-mapped obtained by the HDR Decoder step of the HDR10 video, and the mobile terminal can play the HDR10 video to be tone-mapped according to the user instruction.
  • Brightness refers to the brightness of the picture, in units of candela per square meter (cd/m 2 ) or nits, which is the candle per square meter.
  • the maximum luminance information and the average luminance information of each frame of the HDR10 video are acquired.
  • Step S20 searching for a tone mapping data group corresponding to the maximum brightness information and the average brightness information in a preset tone mapping lookup table
  • the tone mapping lookup table is a dynamic mapping specification based on high dynamic range hardware, and the tone mapping lookup table made by the tone mapping data sets of different sets of different dynamic ranges and different average brightnesses is debugged. For example, the maximum brightness information and the average brightness information of the actually acquired frame picture are 4000 nits and 500 nits, respectively, and then the tone mapping data set debugged according to the average brightness of 500 nits and the maximum brightness of 4000 nits is searched in the tone mapping lookup table.
  • Step S30 calling the tone mapping data group to perform tone mapping transformation on a frame to be displayed on the display terminal;
  • the corresponding tone mapping data group in the tone mapping lookup table is called to perform tone mapping transformation on the frame to be displayed. For example, when the average brightness of the picture is 500 nits and the maximum brightness of 4000 nits is debugged, the tone mapping data set in the tone mapping lookup table with a dynamic range of 0.001 to 2000 nits and an average brightness of 300 nits is obtained, then the maximum brightness and the average brightness of the acquired frame picture are respectively For 4000 nits and 500 nits, a set of tone mapping data sets with a dynamic range of 0.001 to 2000 nits and an average brightness of 300 nits in the tone mapping lookup table are retrieved for tone mapping.
  • the tone mapping data set corresponding to the maximum brightness information and the average brightness information is searched in a preset tone mapping lookup table, and the The tone mapping data group performs tone mapping transformation on the frame of the display terminal to be displayed, and performs the above steps until the video is played; thereby changing the tone mapping data group in real time according to the maximum brightness information and the average brightness information of the frame image monitored in real time. Rational use of hardware dynamic range to better demonstrate HDR effects.
  • the step of acquiring the maximum brightness information and the average brightness information of the frame picture to be displayed by the display terminal in step S10 includes:
  • Step S11 Separating the frame to be displayed of the display terminal into a plurality of blocks based on hardware parameters of the display terminal, and monitoring maximum sub-luminance information and average sub-luminance information of each block;
  • the entire picture is divided into m*n areas in a matrix according to the hardware backlight partitioning mode. For example, based on the size of the display terminal and the number of the illuminated bead, the original frame picture image is correspondingly divided into 20*12 sub-regions, that is, the frame picture is horizontally divided into 20 equal-sized sub-blocks, and the vertical direction is divided into 12 equal-sized sub-blocks. Block, a total of 240 sub-blocks. Specifically, all the LEDs in the direct type backlight are divided into a plurality of small units, and at the same time, the area backlight brightness control circuit in the hardware main control circuit or the separately set area backlight brightness control circuit divides the entire image picture into corresponding small numbers.
  • the unit, the number of units corresponds to the number of LED units in the hardware.
  • the LED of one unit may contain several or a dozen LEDs, and the backlight LEDs in the same small unit are controlled by the same LED driving circuit, and the illumination brightness is equal.
  • the maximum sub-luminance information and the average luminance information of each block are monitored, that is, the color coordinate points of each pixel of each sub-area are calculated and counted.
  • the luminance coding value corresponds to the luminance value one by one, and the YUV color coding method; wherein "Y" represents brightness, that is, gray scale value, and "U” and "V” represent color Degree, the role is to describe the image color and saturation, used to specify the color of the pixel.
  • the YUV color space Since the importance of the YUV color space is that its luminance signal Y and chrominance signals U, V are separated, then only the Y value of the YUV code of each pixel of the signal is extracted, and the maximum sub-luminance information of each block can be obtained. Average sub-brightness information.
  • Step S12 the maximum sub-luminance information and the average sub-luminance information of each block are counted, and the maximum brightness information and the average brightness information of the frame picture to be displayed by the display terminal are calculated.
  • the maximum luminance information and the average luminance information of the frame picture can be obtained by directly statistically averaging.
  • tone mapping The whole process of tone mapping is to first calculate the average brightness of the picture according to the current picture, and then select an appropriate dynamic range according to the average brightness, and then map the entire picture to this dynamic range to obtain the mapping result.
  • log-average brightness As the average brightness, which can be calculated by the following companies:
  • L w (x, y) is the brightness of the pixel point (x, y)
  • N is the number of pixels in the picture
  • ⁇ is the overflow constant, which is a small number used to cope with the case where the pixel is pure black.
  • each sub-block performs the detection of the block brightness by counting the Y value of each pixel YUV code, and finally, the result of each block detection is statistically averaged, thereby obtaining the maximum brightness information of the frame picture to be displayed quickly and accurately. And average brightness information.
  • step S20 the step of searching for the tone mapping data set corresponding to the maximum brightness information and the average brightness information in the preset tone mapping lookup table is performed in step S20.
  • Step S21 based on the dynamic range specification of the high dynamic range hardware, debug generating a plurality of sets of tone mapping data sets of different dynamic ranges and different average brightnesses, storing the generated tone mapping data sets, and generating a tone mapping lookup table.
  • tone mapping data is stored in the form of a lookup table. For example, according to the dynamic range specification of the specific hardware parameter, the following 40 sets of tone mapping data are generated, and the 40 sets of tone mapping data are rented and stored, that is, a tone mapping lookup table.
  • the dynamic range is 0.001 to 500 nits, and the average brightness is 100, 200, 300, 500 nits;
  • the dynamic range is 0.001 to 1000 nits, and the average brightness is 100, 200, 300, 500, 800, 1000 nits;
  • the dynamic range is 0.001 to 1500 nits, and the average brightness is 100, 200, 300, 500, 800, 1000, 1200, 1500 nits;
  • the dynamic range is 0.001 to 2000 nits, and the average brightness is 100, 200, 300, 500, 800, 1000, 1200, 1500, 1800, 2000 nits;
  • the dynamic range is 0.001 to 4000 nits, and the average brightness is 100, 200, 300, 500, 800, 1000, 1200, 1500, 1800, 2000, 3000, 4000 nits, respectively.
  • the set of tone mapping data sets having a dynamic range of 0.001 to 500 nits and an average brightness of 200 nits are debugged according to a maximum brightness of 500 nits and an average brightness of 200 nits, so when searching for the tone mapping lookup table,
  • the brightness data of the maximum brightness of 500 nits and the average brightness of 200 nits corresponds to the set of tone mapping data sets in the tone mapping lookup table with a dynamic range of 0.001 to 500 nits and an average brightness of 200 nits.
  • the tone mapping data set is generated according to the specific hardware parameter debugging in advance, and stored as a tone mapping lookup table, so that the tone mapping data group needs to be generated in real time during the tone mapping transformation process, and the running resource is generated.
  • a large amount of consumption affects the processing efficiency of the processor.
  • the step of searching for the tone mapping data set corresponding to the maximum brightness information and the average brightness information in the preset tone mapping lookup table in step S20 ,Also includes:
  • Step S22 determining whether the maximum brightness information and the average brightness information have a logical relationship with the tone mapping data set in the tone mapping lookup table.
  • the logical relationship is a correspondence between the maximum luminance information and the average luminance information of the actually acquired frame to be displayed and the maximum luminance information and the average luminance information of the tone mapping data group in the generated tone mapping lookup table.
  • Step S23 if the maximum brightness information and the average brightness information have a logical relationship with the tone mapping data group in the tone mapping lookup table, then the tone mapping data group is called to perform a tone mapping conversion step on the frame picture to be displayed on the display terminal.
  • the set of tone mapping data sets having a dynamic range of 0.001 to 500 nits and an average brightness of 200 nits are debugged according to a maximum brightness of 500 nits and an average brightness of 200 nits.
  • the actually obtained frame to be displayed has a maximum brightness of 500 nits and an average brightness of 200 nits.
  • the maximum brightness information and the average brightness information obtained above are found in a logical relationship with the tone mapping data set in the tone mapping lookup table.
  • the actual maximum brightness is 500 nits
  • the average brightness is 200 nits
  • the maximum brightness used for debugging is 500 nits
  • the average brightness is 200 nits.
  • tone mapping transformation The maximum brightness information and average brightness information actually obtained and the tone mapping data set in the tone mapping lookup table exist.
  • the set of tone mapping data sets with a dynamic range of 0.001 to 500 nits and an average brightness of 200 nits are called for tone mapping transformation.
  • step S22 after determining, in step S22, whether the maximum brightness information and the average brightness information have a logical relationship with the tone mapping data group in the tone mapping lookup table, include:
  • Step S24 if the maximum brightness information and the average brightness information do not have a logical relationship with the tone mapping data group in the tone mapping lookup table, it is confirmed whether the maximum brightness information and the average brightness information can be the maximum brightness information of the adjacent interval. Average brightness information replacement;
  • Step S241 if the maximum brightness information and the average brightness information are replaced by the maximum brightness information and the average brightness information of the adjacent sections in the tone mapping lookup table, the tone mapping is further searched according to the maximum brightness information and the average brightness information after the replacement. Find the corresponding tone mapping data set in the table.
  • Each of the sets of tone mapping data sets may correspond to a range of maximum brightness and average brightness.
  • a certain group in the tone mapping data group has a dynamic range of 0.001 to 500 nits and an average brightness of 200 nits.
  • the tone mapping data set is debugged according to a maximum brightness of 500 nits and an average brightness of 200 nits, and the maximum brightness is 450 nits according to hardware parameters.
  • the maximum brightness and average brightness within its range correspond to the set of tone mapping data sets.
  • the maximum brightness is detected to be 490 nits
  • the average brightness is 210 nits
  • the maximum brightness used for debugging is 500 nits
  • the average brightness is 200 nits
  • the maximum brightness detected is 490 nits
  • the average brightness is 210 nits at a maximum brightness of 500 nits and an average brightness of 200 nits.
  • the maximum brightness is 500 nits
  • the average brightness is 200 nits
  • the maximum brightness is 490 nits
  • the average brightness is 210 nits
  • the maximum brightness is 500 nits
  • the dynamic range of the average brightness of 200 nits is 0.001 to 500 nits
  • the average brightness is 200 nits for tone mapping conversion.
  • the adjacent interval substitutability is determined, and the alternative tone mapping data group is selected nearby, thereby expanding the
  • the search range of the tone mapping lookup table facilitates changing the tone mapping data set in real time for tone mapping transformation.
  • step S24 after the step of confirming whether the maximum brightness information and the average brightness information can be replaced by the maximum brightness information and the average brightness information of the adjacent interval, in step S24 ,Also includes:
  • Step S242 if the maximum brightness information and the average brightness information cannot be replaced by the maximum brightness information and the average brightness information of the adjacent sections in the tone mapping lookup table, the new tone mapping is generated according to the maximum brightness information and the average brightness information.
  • Step S243 the maximum brightness information and the average brightness information are stored in the tone mapping lookup table corresponding to the dynamic range and the average brightness information in the debugged new tone mapping data set.
  • the maximum brightness information and the average brightness information are debugged, and a new tone mapping data set suitable for the dynamic range of the actual hardware platform is debugged, and the debugged tone mapping data set is added to the tone mapping lookup table. in.
  • the acquired maximum brightness information and average brightness information that cannot be matched to the tone mapping data set in the tone mapping lookup table are re-commissioned in the actual running hardware platform, and the tone mapping data set obtained by debugging is obtained.
  • Adding to the tone mapping lookup table to update the data information in the tone mapping lookup table facilitates the tone mapping transformation of the HDR10 video again, reduces the cost of running resources in the tone mapping transformation process, and improves the processing efficiency of the processor.
  • the step of acquiring the maximum brightness information and the average brightness information of the frame picture to be displayed by the display terminal in step S10 further includes:
  • Step S13 setting a lag time for acquiring the maximum brightness information and the average brightness information based on hardware parameters of the display terminal, and after obtaining the lag time, acquiring the maximum brightness information and the average brightness information.
  • the lag time is the time between the maximum luminance information and the average luminance information of the frame picture acquired twice.
  • the maximum brightness information and the average brightness information of the frame picture collected this time may be the same as the maximum brightness information and the average brightness information of the frame picture acquired next time, then, this
  • the tone mapping transformation is performed. If the same set of tone mapping data is frequently called, the same set of tone mapping data will be calculated to obtain different tone mapping transformation results, resulting in unstable picture brightness.
  • the hysteresis time is set, and the time between acquiring the tone mapping data and performing the tone mapping transformation is increased, and the same set of tone mapping data is frequently called for tone mapping conversion, thereby shielding the two sets of the same
  • the tone mapping data set calculates the result of calling other tone mapping transformations, thereby keeping the picture brightness stable.
  • a video of HDR10 is obtained by HDR Decoder, and the frame is divided into m*n blocks, and each frame of the frame is monitored.
  • the maximum sub-luminance information and the average sub-luminance information of the block and statistically generate the maximum brightness information and the average brightness information of the current frame picture, such as a maximum brightness of 4000 nits, an average brightness of 500 nits, and find a set of tone mapping data in the tone mapping lookup table.
  • the group is obtained according to the average brightness of 500 nits and the maximum brightness of 4000 nits.
  • the set of tone mapping data sets has a dynamic range of 0.001 to 2000 nits and an average brightness of 300 nits
  • the dynamic range is 0.001 to 2000 nits and the average brightness is 300 nits.
  • the tone mapping data set performs tone mapping conversion on the frame picture, and the above steps are repeated until the HDR10 video is played.
  • the left three figures in FIG. 4 are all based on the average brightness of 500 nits and the maximum brightness of 4000 nits to obtain the right three frames.
  • the three images with different brightness are converted by the tone mapping under the same conditions, and the highlighted part of the picture can be displayed normally, but the lower brightness part of the picture is compressed because it exceeds the dynamic range of the hardware display. Fully expanded, causing it to not display properly.
  • the left side is also the three pictures on the left side of Fig. 4.
  • the three pictures are respectively subjected to tone mapping according to the maximum brightness and the average brightness of each picture, and the three pictures on the right side in Fig. 5 are obtained.
  • three different brightness maps are subjected to tone mapping transformation through the maximum brightness and average brightness information of the tone map obtained according to the brightness information of different pictures, and the highlighted part and the low brightness part of the picture can be normally displayed. Therefore, according to the maximum brightness and average brightness information of the frame image monitored in real time, the tone mapping data set is changed in real time to realize dynamic tone mapping, thereby achieving reasonable utilization of the hardware dynamic range and better displaying the HDR effect.
  • the present application also provides a mobile terminal, the mobile terminal comprising: a memory, a processor, and a dynamic tone mapping program stored on the memory and operable on the processor, the dynamic tone mapping program being The steps of the embodiments of the dynamic tone mapping method described above are implemented when the processor executes.
  • the present application also provides a computer readable storage medium having a dynamic tone mapping program stored thereon, the dynamic tone mapping program being executed by a processor to implement the steps of the embodiments of the dynamic tone mapping method described above.
  • the foregoing embodiment method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is better.
  • Implementation Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a mobile terminal (which may be a cell phone, computer, server, air conditioner, or network device, etc.) to perform the methods described in various embodiments of the present application.

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Abstract

本申请公开了一种动态色调映射方法、移动终端及计算机可读存储介质，所述动态色调映射方法包括：获取显示终端待显示帧画面的最大亮度信息和平均亮度信息；在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组；调用所述色调映射数据组，对显示终端待显示帧画面进行色调映射变换。本申请根据实时监测到的帧画面最大亮度信息和平均亮度信息，实时改变进行色调映射变换的色调映射数据组，达到合理利用硬件动态范围、更好地展示HDR效果。

Description

动态色调映射方法、移动终端及计算机可读存储介质
本申请要求于2017年12月22日提交中国专利局、申请号为201711418472.9、发明名称为“动态色调映射方法、移动终端及计算机可读存储介质”的中国专利申请的优先权，其全部内容通过引用结合在申请中。
技术领域
本申请涉及高动态范围图像处理技术领域，尤其涉及一种动态色调映射方法、移动终端及计算机可读存储介质。
背景技术
高动态范围(High Dynamic Range,HDR)影像在计算机图形学和图像处理这些领域中正被广泛使用，HDR视频具有与真实场景的亮度相匹配的亮度动态范围。基于HDR视频的制作理念，目前HDR10视频普遍的亮度范围均在0.001～1000尼特左右，而ST.2084本身覆盖了0.000001～10000尼特，这意味着HDR10视频对于硬件要求会非常高。
因此，在硬件亮度范围不能覆盖视频内容时，依照HDR视频的理念，就必须参考硬件本身的条件，设计对亮度进行压缩的方法。然而，视频中各帧画面平均亮度不可能从头到尾保持一致，对亮度进行压缩也不能根据帧画面平均亮度的变化作调整，从而导致硬件的动态范围的浪费，不能很好的展示HDR效果。
发明内容
本申请的主要目的在于提供一种动态色调映射方法、移动终端及计算机可读存储介质，旨在解决HDR10视频画面在HDR显示终端播放时，不能根据帧画面平均亮度的变化作调整，导致硬件的动态范围的浪费，不能很好的展示HDR效果的技术问题。
为实现上述目的，本申请实施例提供一种动态色调映射方法，所 述动态色调映射方法包括：
获取显示终端待显示帧画面的最大亮度信息和平均亮度信息；
在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组；
调用所述色调映射数据组，对显示终端待显示帧画面进行色调映射变换。
可选地，所述获取显示终端待显示帧画面的最大亮度信息和平均亮度信息的步骤包括：
基于显示终端的硬件参数，将显示终端待显示帧画面分隔为多个区块，监测各区块的最大子亮度信息和平均子亮度信息；
统计各区块的最大子亮度信息和平均子亮度信息，计算出显示终端待显示帧画面的最大亮度信息和平均亮度信息。
可选地，所述在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组的步骤之前包括：
基于高动态范围硬件的动态范围规格，调试生成多组不同动态范围、不同平均亮度的色调映射数据组，将生成的色调映射数据组存储并生成色调映射查找表。
可选地，所述在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组的步骤，还包括：
判断所述最大亮度信息和平均亮度信息是否与色调映射查找表中色调映射数据组存在逻辑关系；
若所述最大亮度信息和平均亮度信息与色调映射查找表中色调映射数据组存在逻辑关系，则执行调用所述色调映射数据组，对显示终端待显示帧画面进行色调映射变换步骤。
可选地，所述判断所述最大亮度信息和平均亮度信息是否与色调映射查找表中色调映射数据组存在逻辑关系步骤之后，还包括：
若所述最大亮度信息和平均亮度信息与色调映射查找表中色调映射数据组不存在逻辑关系，则确认所述最大亮度信息和平均亮度信息是否可被相邻区间的最大亮度信息和平均亮度信息替换。
可选地，所述确认所述最大亮度信息和平均亮度信息是否可被相 邻区间的最大亮度信息和平均亮度信息替换的步骤之后，还包括：
若所述最大亮度信息和平均亮度信息可被色调映射查找表中相邻区间的最大亮度信息和平均亮度信息替换，则根据替换之后的最大亮度信息和平均亮度信息重新在色调映射查找表中查找对应的色调映射数据组。
可选地，所述确认所述最大亮度信息和平均亮度信息是否可被相邻区间的最大亮度信息和平均亮度信息替换的步骤之后，还包括：
若所述最大亮度信息和平均亮度信息不能被色调映射查找表中相邻区间的最大亮度信息和平均亮度信息替换，则根据所述最大亮度信息和平均亮度信息调试生成新的色调映射数据组；
将所述最大亮度信息和平均亮度信息与调试得到的新的色调映射数据组中的动态范围和平均亮度信息对应存储到色调映射查找表中。
可选地，所述获取显示终端待显示帧画面的最大亮度信息和平均亮度信息的步骤，还包括：
基于显示终端的硬件参数，设定获取所述最大亮度信息和平均亮度信息的迟滞时间，间隔所述迟滞时间之后，进行所述最大亮度信息和平均亮度信息的获取。
本申请还提供一种移动终端，所述移动终端包括：存储器、处理器以及存储在所述存储器上并可在所述处理器上运行的动态色调映射程序，所述动态色调映射程序被所述处理器执行时实现上述的动态色调映射方法的步骤。
本申请还提供一种计算机可读存储介质，所述计算机可读存储介质上存储有动态色调映射程序，所述动态色调映射程序被处理器执行时实现上述的动态色调映射方法的步骤。
本申请通过实时获取显示终端待显示帧画面的最大亮度信息和平均亮度信息，在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组，调用所述色调映射数据组，对显示终端待显示帧画面进行色调映射变换，从而根据实时监测到的帧画面最大亮度信息和平均亮度信息，实时改变色调映射数据组，达 到合理利用硬件动态范围、更好地展示HDR效果。
附图说明
图1为实现本申请各个实施例一个可选的移动终端的硬件结构示意图；
图2为本申请动态色调映射方法一实施例的流程示意图；
图3为本申请动态色调映射方法通过同一色调映射数据组对不同亮度图片进行色调映射变换的效果图；
图4为本申请动态色调映射方法通过不同色调映射数据组对不同亮度图片进行色调映射变换的效果图。
本申请目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
在后续的描述中，使用用于表示元件的诸如“模块”、“部件”或“单元”的后缀仅为了有利于本申请的说明，其本身没有特定的意义。因此，“模块”、“部件”或“单元”可以混合地使用。
如图1所示，图1是本申请实施例方案涉及的硬件运行环境的终端结构示意图。
本申请实施例终端可以是PC，也可以是智能手机、平板电脑、电子书阅读器、MP3(Moving Picture Experts Group Audio Layer III，动态影像专家压缩标准音频层面3)播放器、MP4(Moving Picture Experts Group Audio Layer IV，动态影像专家压缩标准音频层面3)播放器、便携计算机等具有显示功能的可移动式终端设备。
如图1所示，该终端可以包括：处理器1001，例如CPU，网络接口1004，用户接口1003，存储器1005，通信总线1002。其中，通信总线1002用于实现这些组件之间的连接通信。用户接口1003可以 包括显示屏(Display)、输入单元比如键盘(Keyboard)，可选用户接口1003还可以包括标准的有线接口、无线接口。网络接口1004可选的可以包括标准的有线接口、无线接口(如WI-FI接口)。存储器1005可以是高速RAM存储器，也可以是稳定的存储器(non-volatile memory)，例如磁盘存储器。存储器1005可选的还可以是独立于前述处理器1001的存储装置。
可选地，终端还可以包括摄像头、RF(Radio Frequency，射频)电路，传感器、音频电路、WiFi模块等等。其中，传感器比如光传感器、运动传感器以及其他传感器。具体地，光传感器可包括环境光传感器及接近传感器，其中，环境光传感器可根据环境光线的明暗来调节显示屏的亮度，接近传感器可在移动终端移动到耳边时，关闭显示屏和/或背光。作为运动传感器的一种，重力加速度传感器可检测各个方向上(一般为三轴)加速度的大小，静止时可检测出重力的大小及方向，可用于识别移动终端姿态的应用(比如横竖屏切换、相关游戏、磁力计姿态校准)、振动识别相关功能(比如计步器、敲击)等；当然，移动终端还可配置陀螺仪、气压计、湿度计、温度计、红外线传感器等其他传感器，在此不再赘述。
本领域技术人员可以理解，图1中示出的终端结构并不构成对终端的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
如图1所示，作为一种计算机存储介质的存储器1005中可以包括操作系统、网络通信模块、用户接口模块以及动态色调映射程序。
在图1所示的终端中，网络接口1004主要用于连接后台服务器，与后台服务器进行数据通信；用户接口1003主要用于连接客户端(用户端)，与客户端进行数据通信；而处理器1001可以用于调用存储器1005中存储的动态色调映射程序。
基于上述移动终端硬件结构以及通信网络系统，提出本申请动态 色调映射方法和移动终端各个实施例。
本申请提供一种动态色调映射方法，在动态色调映射方法一实施例中，参照图2，该方法包括：
步骤S10，获取显示终端待显示帧画面的最大亮度信息和平均亮度信息；
显示终端待显示帧画面为HDR10视频经HDR Decoder步骤所得到的待进行色调映射的HDR10视频中每一帧的画面，移动终端可根据用户指令，播放待进行色调映射的HDR10视频。亮度是指画面的明亮程度，单位是堪德拉每平米(cd/m 2)或称nits，也就是每平方公尺分之烛光。将HDR10视频中的每一帧画面的最大亮度信息和平均亮度信息进行获取。
步骤S20，在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组；
色调映射查找表为基于高动态范围硬件的动态范围规格，调试生成的多组不同动态范围、不同平均亮度的色调映射数据组制成的色调映射查找表。例如，实际获取的帧画面的最大亮度信息和平均亮度信息分别为4000nits和500nits，那么在色调映射查找表中查找根据平均亮度500nits和最大亮度4000nits调试得出的色调映射数据组。
步骤S30，调用所述色调映射数据组，对显示终端待显示帧画面进行色调映射变换；
调用色调映射查找表中对应的色调映射数据组对待显示帧画面进行色调映射变换。例如，当画面平均亮度500nits，最大亮度4000nits调试得出动态范围为0.001～2000nits、平均亮度为300nits的色调映射查找表中的色调映射数据组，那么当获取的帧画面的最大亮度和平均亮度分别为4000nits和500nits，则调取色调映射查找表中动态范围为0.001～2000nits，平均亮度为300nits这一套色调映射数据组进行色调映射变换。
在本实施例中，通过实时获取帧画面的最大亮度信息和平均亮度信息，在预设的色调映射查找表中查找与所述最大亮度信息和平均亮 度信息对应的色调映射数据组，调用所述色调映射数据组，对显示终端待显示帧画面进行色调映射变换，循环执行上述步骤直至视频播放完毕；从而根据实时监测到的帧画面最大亮度信息和平均亮度信息，实时改变色调映射数据组，达到合理利用硬件动态范围、更好地展示HDR效果。
可选地，在本申请动态色调映射方法另一实施例中，步骤S10所述获取显示终端待显示帧画面的最大亮度信息和平均亮度信息的步骤包括：
步骤S11，基于显示终端的硬件参数，将显示终端待显示帧画面分隔为多个区块，监测各区块的最大子亮度信息和平均子亮度信息；
分隔为多个区块，根据硬件背光分区方式，将整个画面按矩阵式分成m*n个区域。例如，基于显示终端尺寸，发光灯珠数量，将原始帧画面图像对应分割为20*12个子区域，即将帧画面横向分为20个等大的子区块，纵向分为12个等大的子区块，一共240个子区块。具体的，将直下式背光中所有的LED划分为若干个小单元，同时，硬件主控电路内的区域背光亮度控制电路或单独设置的区域背光亮度控制电路将整个图像画面分割成相应数量的小单元，单元数与硬件中的LED单元数相对应，一个单元的LED可以包含几个或十几个LED，同一小单元内的背光LED受同一LED驱动电路控制，发光亮度相等。监测各区块的最大子亮度信息和平均亮度信息，即对每个子区域的各个像素的色坐标点进行计算与统计。基于ST.2084标准的特性，亮度编码值与亮度值一一对应，YUV颜色编码方法；其中“Y”表示明亮度，也就是灰阶值，而“U”和“V”表示的则是色度，作用是描述影像色彩及饱和度，用于指定像素的颜色。由于采用的YUV色彩空间的重要性是它的亮度信号Y和色度信号U、V是分离的，那么只需提取信号各像素YUV编码的Y值，即可得到各区块的最大子亮度信息和平均子亮度信息。
步骤S12，统计各区块的最大子亮度信息和平均子亮度信息，计算出显示终端待显示帧画面的最大亮度信息和平均亮度信息。
据上述步骤S11中得到的各个区块的最大子亮度信息和平均子亮度信息，直接统计平均即可得到帧画面的最大亮度信息和平均亮度信息。
整个色调映射的过程就是首先要根据当前的画面推算出画面的平均亮度，再根据平均亮度选取一个合适的动态范围，再将整个画面映射到这个动态范围得到映射结果。目前常用的是使用log-average亮度作为平均亮度，通过下面公司可以计算得到：
Figure PCTCN2018102096-appb-000001
其中，L w(x,y)是像素点(x,y)的亮度，N是画面内像素数，δ为溢出常数，是一个很小的数用来应对像素点纯黑的情况。
在本实施例中，基于提高检测各个待显示帧画面的最大亮度信息和平均亮度信息的效率和准确率，采用将帧画面进行分区块，并且基于使用的硬件的参数分为m*n个区块，每个子区块通过统计各个像素YUV编码的Y值，进行区块亮度的检测，最后，将各个区块检测的结果进行统计平均，从而快速、准确的得到待显示帧画面的最大亮度信息和平均亮度信息。
可选地，在本申请动态色调映射方法另一实施例中，步骤S20所述在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组的步骤之前包括：
步骤S21，基于高动态范围硬件的动态范围规格，调试生成多组不同动态范围、不同平均亮度的色调映射数据组，将生成的色调映射数据组存储并生成色调映射查找表。
由于色调映射数据通常较大，实时计算生成色调映射数据会耗费大量运行资源，从而影响处理器处理效率，理想的做法是采用查找表的形式存储色调映射数据。例如，根据具体的硬件参数的动态范围规格调试生成如下40组色调映射数据，将所述40组色调映射数据租进行存储，即为色调映射查找表。
动态范围为0.001～500nits、平均亮度分别为100、200、300、 500nits；
动态范围为0.001～1000nits、平均亮度分别为100、200、300、500、800、1000nits；
动态范围为0.001～1500nits、平均亮度分别为100、200、300、500、800、1000、1200、1500nits；
动态范围为0.001～2000nits、平均亮度分别为100、200、300、500、800、1000、1200、1500、1800、2000nits；
动态范围为0.001～4000nits、平均亮度分别为100、200、300、500、800、1000、1200、1500、1800、2000、3000、4000nits。
例如，上述色调映射查找表中动态范围为0.001～500nits，平均亮度为200nits的这组色调映射数据组是根据最大亮度500nits，平均亮度200nits调试得出的，那么在查找所述色调映射查找表时，最大亮度500nits，平均亮度200nits这组亮度数据即对应色调映射查找表中动态范围为0.001～500nits，平均亮度为200nits的这组色调映射数据组。
在本实施例中，通过预先根据具体硬件参数调试生成色调映射数据组，并将其存储为色调映射查找表，避免在进行色调映射变换过程中需要实时计算生成色调映射数据组，而造成运行资源的大量消耗，影响处理器的处理效率。
可选地，在本申请动态色调映射方法另一实施例中，在步骤S20所述在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组的步骤，还包括：
步骤S22，判断所述最大亮度信息和平均亮度信息是否与色调映射查找表中色调映射数据组存在逻辑关系。
逻辑关系为实际获取的待显示帧画面的最大亮度信息和平均亮度信息与生成的色调映射查找表中色调映射数据组的最大亮度信息和平均亮度信息之间的对应关系。
步骤S23，若所述最大亮度信息和平均亮度信息与色调映射查找表中色调映射数据组存在逻辑关系，则执行调用所述色调映射数据 组，对显示终端待显示帧画面进行色调映射变换步骤。
例如，上述40组色调映射数据组中动态范围为0.001～500nits，平均亮度为200nits的这组色调映射数据组是根据最大亮度500nits，平均亮度200nits调试得出的。实际获取的待显示帧画面的最大亮度为500nits，平均亮度为200nits，将上述实际获得的最大亮度信息和平均亮度信息与色调映射查找表中的色调映射数据组寻找逻辑关系，在本实例中，实际获取的最大亮度为500nits，平均亮度为200nits，与调试使用的最大亮度为500nits，平均亮度为200nits一致，则实际获取的最大亮度信息和平均亮度信息与色调映射查找表中色调映射数据组存在逻辑关系，则调用动态范围为0.001～500nits，平均亮度为200nits的这组色调映射数据组进行色调映射变换。
在本实施例中，通过判断实际获取的显示终端待显示画面的最大亮度信息和平均亮度信息与色调映射查找表中进行调试色调映射数据组使用的最大亮度信息和平均亮度信息进行比对，从而得到实际获取的最大亮度信息和平均亮度信息与色调映射查找表中色调映射数据组的关系，便于通过实际获得的最大亮度信息和平均和平均亮度信息调用进行色调映射变换的色调映射数据组。
可选地，在本申请动态色调映射方法另一实施例中，在步骤S22所述判断所述最大亮度信息和平均亮度信息是否与色调映射查找表中色调映射数据组存在逻辑关系步骤之后，还包括：
步骤S24，若所述最大亮度信息和平均亮度信息与色调映射查找表中色调映射数据组不存在逻辑关系，则确认所述最大亮度信息和平均亮度信息是否可被相邻区间的最大亮度信息和平均亮度信息替换；
步骤S241，若所述最大亮度信息和平均亮度信息可被色调映射查找表中相邻区间的最大亮度信息和平均亮度信息替换，则根据替换之后的最大亮度信息和平均亮度信息重新在色调映射查找表中查找对应的色调映射数据组。
不存在逻辑关系，即所述最大亮度信息和平均亮度信息与色调映射查找表中所有经调试得到的色调映射数据组使用的最大亮度信息 和平均亮度信息均不相同。所述的色调映射数据组的每一组可以对应一个最大亮度和平均亮度的范围。例如，色调映射数据组中的某一组为动态范围0.001～500nits，平均亮度200nits，该色调映射数据组是根据最大亮度500nits，平均亮度200nits调试得到的，根据硬件参数，调试出最大亮度450nits～550nits，平均亮度120nits～220nits，将在其范围内的最大亮度和平均亮度均对应到该组色调映射数据组。例如，在检测到最大亮度为490nits，平均亮度为210nits，与调试使用的最大亮度500nits，平均亮度200nits并不一致，但是检测到的最大亮度490nits，平均亮度210nits在最大亮度500nits，平均亮度200nits范围附近，即用最大亮度500nits，平均亮度200nits替换最大亮度490nits，平均亮度210nits，调用最大亮度500nits，平均亮度200nits调试得到的动态范围0.001～500nits，平均亮度200nits进行色调映射变换。
在本实施例中，通过对在色调映射查找表未找到对应色调映射数据组的最大亮度信息和平均亮度信息进行相邻区间可替代性的判断，就近选取替代的色调映射数据组，从而扩展了色调映射查找表的查找范围，利于实时改变色调映射数据组进行色调映射变换。
可选地，在本申请动态色调映射方法另一实施例中，在步骤S24所述确认所述最大亮度信息和平均亮度信息是否可被相邻区间的最大亮度信息和平均亮度信息替换的步骤之后，还包括：
步骤S242，若所述最大亮度信息和平均亮度信息不能被色调映射查找表中相邻区间的最大亮度信息和平均亮度信息替换，则根据所述最大亮度信息和平均亮度信息调试生成新的色调映射数据组；
步骤S243，将所述最大亮度信息和平均亮度信息与调试得到的新的色调映射数据组中的动态范围和平均亮度信息对应存储到色调映射查找表中。
基于实际硬件平台参数，根据所述最大亮度信息和平均亮度信息进行调试，调试得到适合实际硬件平台动态范围的新的色调映射数据组，并将调试得到的色调映射数据组添加到色调映射查找表中。
在本实施例中，将获取的无法在色调映射查找表中匹配到色调映射数据组的最大亮度信息和平均亮度信息，在实际运行的硬件平台中进行重新调试，将调试得到的色调映射数据组添加到色调映射查找表中，从而更新色调映射查找表中数据信息，利于再次对HDR10视频进行色调映射变换，降低色调映射变换过程中运行资源的耗费，提高处理器的处理效率。
进一步地，在本申请动态色调映射方法另一实施例中，在步骤S10所述获取显示终端待显示帧画面的最大亮度信息和平均亮度信息的步骤，还包括：
步骤S13，基于显示终端的硬件参数，设定获取所述最大亮度信息和平均亮度信息的迟滞时间，间隔所述迟滞时间之后，进行所述最大亮度信息和平均亮度信息的获取。
所述迟滞时间为两次获取帧画面的最大亮度信息和平均亮度信息之间的时间。在实时监测帧画面的最大亮度、平均亮度的过程中，本次采集的帧画面的最大亮度信息和平均亮度信息与下一次采集的帧画面的最大亮度信息和平均亮度信息可能一样，那么，此时调用色调映射查找表中相同的一套色调映射数据组，进行色调映射变换。若频繁调用相同一套色调映射数据，会出现同一套色调映射数据计算得出不同的色调映射变换结果，导致画面亮度不稳定。
在本实施例中，设定迟滞时间，将获取到符合色调映射数据到进行色调映射变换之间的时间变大，避免频繁调用同一套色调映射数据进行色调映射变换，从而屏蔽掉用两套相同色调映射数据组计算出调用其它色调映射变换的结果，进而保持画面亮度表现稳定。
为辅助理解本申请动态色调映射方法，现举一实例进行说明，例如，一段HDR10的视频，经过HDR Decoder得到其中一帧画面，将该帧画面划分为m*n个区块，监测帧画面各区块的最大子亮度信息和平均子亮度信息，并统计平均生成当前帧画面的最大亮度信息和平均亮度信息，如最大亮度4000nits，平均亮度500nits，在色调映射查 找表中查找到某套色调映射数据组为根据平均亮度500nits，最大亮度4000nits调试得出的，如，该组色调映射数据组为动态范围为0.001～2000nits、平均亮度为300nits，则，根据动态范围为0.001～2000nits、平均亮度为300nits的色调映射数据组对该帧画面进行色调映射变换，循环上述步骤，直至HDR10视频播放完毕。
为辅助理解本申请动态色调映射方法的有益效果，现举一实例进行说明，如图4所示，图4中左边三幅图均根据平均亮度500nits，最大亮度4000nits进行色调映射变换得到右边三幅图，从图中可以看出，三幅亮度不同的图经在同等条件下进行色调映射变换，画面中高亮部分可以正常显示，但画面较低亮度部分则因为超出硬件显示动态范围被压缩，无法充分展开，导致不能正常显示。在图5中，左边同样是图4左边三幅图，此时，将三幅图根据各个图片的最大亮度、平均亮度的情况分别进行色调映射，得到图5中右边三幅图，此时，可以看出三幅不同亮度的图，经过根据不同图片的亮度信息得到的色调映射的最大亮度、平均亮度信息，进行色调映射变换，画面中高亮部分、低亮度部分均能正常显示。因此根据实时监测到的帧画面最大亮度、平均亮度信息，实时改变色调映射数据组，实现动态色调映射，达到合理利用硬件动态范围、更好地展示HDR效果。
本申请还提供一种移动终端，所述移动终端包括：存储器、处理器以及存储在所述存储器上并可在所述处理器上运行的动态色调映射程序，所述动态色调映射程序被所述处理器执行时实现上述动态色调映射方法各实施例的步骤。
本申请还提供一种计算机可读存储介质，所述计算机可读存储介质上存储有动态色调映射程序，所述动态色调映射程序被处理器执行时实现上述动态色调映射方法各实施例的步骤。
在本申请移动终端和计算机可读存储介质的实施例中，包含了上述动态色调映射方法各实施例的全部技术特征，说明书拓展和解释内 容与上述动态色调映射方法各实施例基本相同，在此不做赘述。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
上述本申请实施例序号仅仅为了描述，不代表实施例的优劣。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台移动终端(可以是手机，计算机，服务器，空调器，或者网络设备等)执行本申请各个实施例所述的方法。
上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，这些均属于本申请的保护之内。

Claims (20)

  1. 一种动态色调映射方法，其特征在于，所述动态色调映射方法包括：
    获取显示终端待显示帧画面的最大亮度信息和平均亮度信息；
    在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组；
    调用所述色调映射数据组，对显示终端待显示帧画面进行色调映射变换。
  2. 如权利要求1所述的动态色调映射方法，其特征在于，所述获取显示终端待显示帧画面的最大亮度信息和平均亮度信息的步骤包括：
    基于显示终端的硬件参数，将显示终端待显示帧画面分隔为多个区块，监测各区块的最大子亮度信息和平均子亮度信息；
    统计各区块的最大子亮度信息和平均子亮度信息，计算出显示终端待显示帧画面的最大亮度信息和平均亮度信息。
  3. 如权利要求1所述的动态色调映射方法，其特征在于，所述在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组的步骤之前包括：
    基于高动态范围硬件的动态范围规格，调试生成多组不同动态范围、不同平均亮度的色调映射数据组，将生成的色调映射数据组存储并生成色调映射查找表。
  4. 如权利要求1所述的动态色调映射方法，其特征在于，所述在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组的步骤，还包括：
    判断所述最大亮度信息和平均亮度信息是否与色调映射查找表中色调映射数据组存在逻辑关系；
    若所述最大亮度信息和平均亮度信息与色调映射查找表中色调映射数据组存在逻辑关系，则执行调用所述色调映射数据组，对显示终端待显示帧画面进行色调映射变换步骤。
  5. 如权利要求4所述的动态色调映射方法，其特征在于，所述判断所述最大亮度信息和平均亮度信息是否与色调映射查找表中色调映射数据组存在逻辑关系步骤之后，还包括：
    若所述最大亮度信息和平均亮度信息与色调映射查找表中色调映射数据组不存在逻辑关系，则确认所述最大亮度信息和平均亮度信息是否可被相邻区间的最大亮度信息和平均亮度信息替换。
  6. 如权利要求5所述的动态色调映射方法，其特征在于，所述确认所述最大亮度信息和平均亮度信息是否可被相邻区间的最大亮度信息和平均亮度信息替换的步骤之后，还包括：
    若所述最大亮度信息和平均亮度信息可被色调映射查找表中相邻区间的最大亮度信息和平均亮度信息替换，则根据替换之后的最大亮度信息和平均亮度信息重新在色调映射查找表中查找对应的色调映射数据组。
  7. 如权利要求5所述的动态色调映射方法，其特征在于，所述确认所述最大亮度信息和平均亮度信息是否可被相邻区间的最大亮度信息和平均亮度信息替换的步骤之后，还包括：
    若所述最大亮度信息和平均亮度信息不能被色调映射查找表中相邻区间的最大亮度信息和平均亮度信息替换，则根据所述最大亮度信息和平均亮度信息调试生成新的色调映射数据组；
    将所述最大亮度信息和平均亮度信息与调试得到的新的色调映射数据组中的动态范围和平均亮度信息对应存储到色调映射查找表中。
  8. 如权利要求1所述的动态色调映射方法，其特征在于，所述获取显示终端待显示帧画面的最大亮度信息和平均亮度信息的步骤，还包括：
    基于显示终端的硬件参数，设定获取所述最大亮度信息和平均亮度信息的迟滞时间，间隔所述迟滞时间之后，进行所述最大亮度信息和平均亮度信息的获取。
  9. 一种移动终端，其特征在于，所述移动终端包括：存储器、处理器以及存储在所述存储器上并可在所述处理器上运行的动态色 调映射程序，所述动态色调映射程序被所述处理器执行时实现以下步骤：
    获取显示终端待显示帧画面的最大亮度信息和平均亮度信息；
    在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组；
    调用所述色调映射数据组，对显示终端待显示帧画面进行色调映射变换。
  10. 如权利要求9所述的移动终端，其特征在于，所述获取显示终端待显示帧画面的最大亮度信息和平均亮度信息的步骤包括：
    基于显示终端的硬件参数，将显示终端待显示帧画面分隔为多个区块，监测各区块的最大子亮度信息和平均子亮度信息；
    统计各区块的最大子亮度信息和平均子亮度信息，计算出显示终端待显示帧画面的最大亮度信息和平均亮度信息。
  11. 如权利要求9所述的移动终端，其特征在于，所述在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组的步骤之前包括：
    基于高动态范围硬件的动态范围规格，调试生成多组不同动态范围、不同平均亮度的色调映射数据组，将生成的色调映射数据组存储并生成色调映射查找表。
  12. 如权利要求9所述的移动终端，其特征在于，所述在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组的步骤，还包括：
    判断所述最大亮度信息和平均亮度信息是否与色调映射查找表中色调映射数据组存在逻辑关系；
    若所述最大亮度信息和平均亮度信息与色调映射查找表中色调映射数据组存在逻辑关系，则执行调用所述色调映射数据组，对显示终端待显示帧画面进行色调映射变换步骤。
  13. 如权利要求12所述的移动终端，其特征在于，所述判断所述最大亮度信息和平均亮度信息是否与色调映射查找表中色调映射数据组存在逻辑关系步骤之后，还包括：
    若所述最大亮度信息和平均亮度信息与色调映射查找表中色调映射数据组不存在逻辑关系，则确认所述最大亮度信息和平均亮度信息是否可被相邻区间的最大亮度信息和平均亮度信息替换。
  14. 如权利要求13所述的移动终端，其特征在于，所述确认所述最大亮度信息和平均亮度信息是否可被相邻区间的最大亮度信息和平均亮度信息替换的步骤之后，还包括：
    若所述最大亮度信息和平均亮度信息可被色调映射查找表中相邻区间的最大亮度信息和平均亮度信息替换，则根据替换之后的最大亮度信息和平均亮度信息重新在色调映射查找表中查找对应的色调映射数据组。
  15. 如权利要求13所述的移动终端，其特征在于，所述确认所述最大亮度信息和平均亮度信息是否可被相邻区间的最大亮度信息和平均亮度信息替换的步骤之后，还包括：
    若所述最大亮度信息和平均亮度信息不能被色调映射查找表中相邻区间的最大亮度信息和平均亮度信息替换，则根据所述最大亮度信息和平均亮度信息调试生成新的色调映射数据组；
    将所述最大亮度信息和平均亮度信息与调试得到的新的色调映射数据组中的动态范围和平均亮度信息对应存储到色调映射查找表中。
  16. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质上存储有动态色调映射程序，所述动态色调映射程序被处理器执行时实现以下步骤：
    获取显示终端待显示帧画面的最大亮度信息和平均亮度信息；
    在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组；
    调用所述色调映射数据组，对显示终端待显示帧画面进行色调映射变换。
  17. 如权利要求16所述的计算机可读存储介质，其特征在于，所述获取显示终端待显示帧画面的最大亮度信息和平均亮度信息的步骤包括：
    基于显示终端的硬件参数，将显示终端待显示帧画面分隔为多个区块，监测各区块的最大子亮度信息和平均子亮度信息；
    统计各区块的最大子亮度信息和平均子亮度信息，计算出显示终端待显示帧画面的最大亮度信息和平均亮度信息。
  18. 如权利要求16所述的计算机可读存储介质，其特征在于，所述在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组的步骤之前包括：
    基于高动态范围硬件的动态范围规格，调试生成多组不同动态范围、不同平均亮度的色调映射数据组，将生成的色调映射数据组存储并生成色调映射查找表。
  19. 如权利要求16所述的计算机可读存储介质，其特征在于，所述在预设的色调映射查找表中查找与所述最大亮度信息和平均亮度信息对应的色调映射数据组的步骤，还包括：
    判断所述最大亮度信息和平均亮度信息是否与色调映射查找表中色调映射数据组存在逻辑关系；
    若所述最大亮度信息和平均亮度信息与色调映射查找表中色调映射数据组存在逻辑关系，则执行调用所述色调映射数据组，对显示终端待显示帧画面进行色调映射变换步骤。
  20. 如权利要求19所述的计算机可读存储介质，其特征在于，所述判断所述最大亮度信息和平均亮度信息是否与色调映射查找表中色调映射数据组存在逻辑关系步骤之后，还包括：
    若所述最大亮度信息和平均亮度信息与色调映射查找表中色调映射数据组不存在逻辑关系，则确认所述最大亮度信息和平均亮度信息是否可被相邻区间的最大亮度信息和平均亮度信息替换。
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