WO2020125049A1 - 一种基于背光调整的图像处理方法、智能电视及存储介质 - Google Patents

一种基于背光调整的图像处理方法、智能电视及存储介质 Download PDF

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WO2020125049A1
WO2020125049A1 PCT/CN2019/102436 CN2019102436W WO2020125049A1 WO 2020125049 A1 WO2020125049 A1 WO 2020125049A1 CN 2019102436 W CN2019102436 W CN 2019102436W WO 2020125049 A1 WO2020125049 A1 WO 2020125049A1
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preset
backlight
image processing
processing method
backlight adjustment
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PCT/CN2019/102436
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English (en)
French (fr)
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许娜
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深圳创维－Rgb电子有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/44008—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H04N21/4318—Generation of visual interfaces for content selection or interaction; Content or additional data rendering by altering the content in the rendering process, e.g. blanking, blurring or masking an image region
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/485—End-user interface for client configuration
    • H04N21/4854—End-user interface for client configuration for modifying image parameters, e.g. image brightness, contrast

Definitions

  • the present disclosure relates to the field of smart TV technology, and in particular, to an image processing method based on backlight adjustment, a smart TV, and a storage medium.
  • DolbyVision Dolby Vision, to enhance the image effect by increasing the brightness and expanding the dynamic range
  • Dolby Laboratories to improve the quality of video signals. It has been gradually popularized in China in recent years. The whole process from video production to display improves the brightness and expands the dynamic range, retains rich color pixels, restores a more layered picture, and thus exhibits better image effects.
  • more and more players support Dolby Vision decoding and playback, and online video service providers also provide more and more Dolby Vision sources for users to choose.
  • Dolby Vision technology requires a combination of film source and TV software and hardware.
  • the mainstream LED TV screen in the market is mainly liquid crystal material, which is composed of horizontally and vertically arranged pixel units.
  • the pixels are controlled by voltage to form an image, but its It can't emit light by external backlight source, so no matter the brighter or darker images are played, the backlight remains unchanged, so the black screen will not turn black, and it is not conducive to reducing power consumption. It cannot be further improved at the TV level. Image effects.
  • the present disclosure provides an image processing method based on backlight adjustment, a smart TV and a storage medium, aiming to establish the relationship between the Dolby Vision video source and the TV backlight To ensure that the backlight changes smoothly, when the parameters of the Dolby Vision video source change, the TV backlight is controlled to change in real time according to the corresponding relationship, which realizes the effect of dynamically adjusting the backlight according to different pictures of the film source, and improves the playback of video images. effect.
  • An image processing method based on backlight adjustment wherein the image processing method based on backlight adjustment includes:
  • the mapped grayscale data is mapped to the PWM dimming duty cycle, and the backlight value is set to the mapped PWM dimming duty cycle.
  • the image processing method based on backlight adjustment, wherein, when the preset parameter exists, it is determined whether the preset switch is turned on, and when the preset switch is turned on, the preset parameter and the preset gray
  • the order value mapping also includes:
  • the backlight is not adjusted again.
  • the preset grayscale value is a 256-bit grayscale value.
  • the image processing method based on backlight adjustment, in which the Dolby Vision video source is acquired and played, the attribute parameters of the Dolby Vision video source are analyzed by the driving module, and a preset for realizing global light control is judged Whether the parameter exists includes:
  • the drive module analyzes the Dolby Vision video source to obtain attribute parameters, and determines whether a preset parameter for realizing global light control exists.
  • the image processing method based on backlight adjustment wherein, after determining whether a preset parameter for realizing global light control exists, the method further includes:
  • the preset parameter is separated from the attribute parameter.
  • the image processing method based on backlight adjustment wherein, when the preset parameter exists, it is determined whether the preset switch is turned on, and when the preset switch is turned on, the preset parameter and the preset gray scale Before the value is mapped, it also includes:
  • a preset switch for judging whether it is necessary to readjust the backlight parameters is preset.
  • the image processing method based on backlight adjustment, wherein, when the preset parameter exists, determining whether the preset switch is turned on specifically includes:
  • the image processing method based on backlight adjustment, wherein the mapping of the preset parameter and the preset grayscale value when the preset switch is turned on specifically includes:
  • the preset switch When the preset switch is in the on state, the preset parameter and the 256-bit grayscale value are mapped for the first time.
  • the first mapping process specifically includes:
  • the adjustment range of the TV's backlight adjustment UI is from 0 to 100. Take 5 points 0, 25, 50, 75, 100 and measure the corresponding actual brightness value with the instrument;
  • the second mapping process is performed on the 256-bit grayscale data after the first mapping process and the PWM dimming duty cycle.
  • the image processing method based on backlight adjustment described above, wherein setting the backlight value to the mapped PWM dimming duty ratio specifically includes:
  • the image processing method based on backlight adjustment, wherein the 256-bit gray scale data after the first mapping process and the PWM dimming duty ratio before the second mapping process includes:
  • the 256-bit grayscale data after the first mapping process establishes a linear relationship with the PWM dimming duty cycle.
  • a smart TV wherein the smart TV includes: a memory, a processor, and an image processing program based on backlight adjustment stored on the memory and capable of running on the processor, the image processing based on backlight adjustment
  • the program is executed by the processor, the steps of the image processing method based on backlight adjustment described above are realized.
  • a storage medium wherein the storage medium stores an image processing program based on backlight adjustment, and when the image processing program based on backlight adjustment is executed by a processor, the steps of the image processing method based on backlight adjustment described above are implemented.
  • the present disclosure relates to an image processing method based on backlight adjustment, a smart TV, and a storage medium.
  • the method includes: acquiring and playing a Dolby Vision video source, analyzing the attribute parameters of the Dolby Vision video source through a driver module, and judging Whether a preset parameter for realizing global light control exists; when the preset parameter exists, determine whether the preset switch is turned on, and perform the preset parameter and the preset grayscale value when the preset switch is turned on Mapping; the mapped grayscale data is mapped to the PWM dimming duty cycle, and the backlight value is set to the mapped PWM dimming duty cycle.
  • the present disclosure establishes the relationship between the Dolby Vision video source and the TV backlight to ensure that the backlight changes smoothly.
  • the TV backlight is controlled to change in real time according to the corresponding relationship. Different screens of the source dynamically adjust the backlight effect, which improves the playback effect of video images.
  • FIG. 1 is a flowchart of a preferred embodiment of an image processing method based on backlight adjustment of the present disclosure
  • step S10 is a flowchart of step S10 in a preferred embodiment of an image processing method based on backlight adjustment of the present disclosure
  • step S20 is a flowchart of step S20 in a preferred embodiment of an image processing method based on backlight adjustment of the present disclosure
  • step S30 is a flowchart of step S30 in a preferred embodiment of an image processing method based on backlight adjustment of the present disclosure
  • FIG. 5 is a schematic diagram of an operating environment of a preferred embodiment of a smart TV of the present disclosure.
  • the image processing method based on backlight adjustment includes the following steps:
  • Step S10 Obtain and play the Dolby Vision video source, analyze the attribute parameters of the Dolby Vision video source through the driving module, and determine whether the preset parameters for realizing the global light control exist.
  • FIG. 2 is a flowchart of step S10 in the image processing method based on backlight adjustment provided by the present disclosure.
  • the step S10 includes:
  • Dolby Vision video source refers to Dolby Vision (Dolby Vision) video resources.
  • Dolby Vision video source is a video that enhances the image effect by increasing the brightness and expanding the dynamic range, so that the video image can be used regardless of Brightness, color, and contrast are all very realistic.
  • the parameters of the Dolby Vision source are constantly changing during playback (that is, the parameters of the Dolby Vision source vary according to the screen during playback), it is necessary to dynamically adjust the backlight according to the different pictures of the Dolby Vision source. To achieve a better viewing effect.
  • Dolby Driver analyzes the DM metadata parameter (the attribute parameter of the DolbyVision source is called DM metadata), and separates the GD metadata (that is, the preset parameter, which is used to realize the global light control attribute parameter) ,
  • the backlight will not be reset again, that is to say, when the preset parameters for realizing global light control in the attribute parameters are separated, when it is judged that the preset parameters do not exist, it will not Then adjust the backlight again.
  • Step S20 When the preset parameter exists, determine whether the preset switch is turned on, and map the preset parameter and the preset grayscale value when the preset switch is turned on.
  • FIG. 3 is a flowchart of step S20 in the image processing method based on backlight adjustment provided by the present disclosure.
  • the step S20 includes:
  • the preset grayscale value is a 256-bit grayscale value
  • a preset switch for determining whether the backlight parameter needs to be readjusted (set) is preset, and after the GD metadata is separated, the predetermined grayscale value is determined
  • the switch is turned on, the preset parameter and the 256-bit gray scale value are subjected to the first mapping process (mapping refers to the relationship that the elements of the two elements are "corresponding" to each other).
  • the brightness level of the image can be expressed by 256-bit gray scale.
  • the so-called gray scale is to divide the brightness change between the brightest and the darkest into several parts to facilitate the control of the screen brightness corresponding to the signal input.
  • Each digital image It is composed of many points, which are also called pixels. Usually each pixel can show many different colors. It is composed of three sub-pixels of red, green, and blue (RGB). Each sub-pixel, the light source behind it can show different brightness levels, and the gray scale represents the different brightness levels from the darkest to the brightest. The more intermediate levels, the more the picture effect can be presented. The more delicate. Taking 8bitpanel as an example, it can express the 8th power of 2, equal to 256 brightness levels, which is called 256 gray scale.
  • the backlight is no longer readjusted. Turning off the preset switch means that the backlight does not need to be set.
  • Step S30 Map the mapped grayscale data with the PWM dimming duty cycle, and set the backlight value to the mapped PWM dimming duty cycle.
  • FIG. 4 is a flowchart of step S30 in the image processing method based on backlight adjustment provided by the present disclosure.
  • the step S30 includes:
  • the current TV uses PWM duty cycle dimming
  • the TV backlight control is the PWM signal
  • adjusting the TV backlight is to adjust the PWM signal duty cycle (ie, PWM dimming duty cycle, PWM, Pulse Width Modulation, pulse Width modulation, pulse width modulation is a very effective technology that uses the digital output of a microprocessor to control analog circuits, and is widely used in many fields from measurement, communication to power control and conversion).
  • the backlight value is set to the PWM dimming duty cycle after the second mapping process, that is The purpose of dynamically adjusting the backlight according to different pictures is achieved.
  • the DM metadata of each frame of this source contains GD metadata (variable range is 0 to 4096), and the front screen of GD metadata remains at 0, the middle screen remains at 4096, and the rear screen The picture return to 0 remains unchanged.
  • the TV uses PWM duty cycle dimming.
  • the Dolby Driver needs to analyze the DM metadata of the source to obtain the GD metadata parameters. Then establish the mapping between GD metadata and 256-bit grayscale value, the method is as follows: the TV backlight adjustment UI adjustment range is 0 ⁇ 100, the step size is 1, take 5 points 0, 25, 50, 75, 100 respectively use the instrument to measure the corresponding actual brightness, expressed as Lum0, Lum1, Lum2, Lum3, Lum4, the 256-bit gray scale value corresponding to these 5 points is 0, 64, 128, 192, 255, that is, 5 sampling points are gray The level value corresponds to 5 actual brightness values, so that Dolby Driver will output the 256-bit gray level value corresponding to GD according to the above settings.
  • GD_PWM (Distance Y*Backlight_255/Distance X)+Intercept;
  • Distance X and Distance Y are coefficients
  • the coefficients of the linear expression are:
  • PWM_V0, PWM_V64, PWM_V128, PWM_V192, PWM_V255 are the PWM duty cycle corresponding to 0, 25, 50, 75, 100 in the backlight UI, 0, 64, 128, 192, 255 are 256-bit gray scale values, which are divided into four segments. 5 values.
  • the value calculated according to the above expression is the set backlight value.
  • This disclosure establishes the relationship between the Dolby Vision source and the TV backlight, to ensure that the change of the backlight is smooth and unobtrusive.
  • the change of the backlight is real-time and synchronized, which provides for the improvement of the image effect. New directions.
  • the present disclosure also correspondingly provides a smart TV, which includes a processor 10, a memory 20, and a display 30 (when a display screen is connected or (In the case of an external display).
  • FIG. 5 shows only some components of the smart TV, but it should be understood that it is not required to implement all the components shown, and more or fewer components may be implemented instead.
  • the memory 20 may be an internal storage unit of the smart TV, such as a hard disk or a memory of the smart TV.
  • the memory 20 may also be an external storage device of the smart TV, for example, a plug-in hard disk equipped on the smart TV, a smart memory card (Smart Media, Card, SMC), and a secure digital (Secure Digital, SD) card, flash card (Flash Card), etc.
  • the memory 20 may also include both an internal storage unit of the smart TV and an external storage device.
  • the memory 20 is used to store application software and various types of data installed on the smart TV, such as the program code of the smart TV installation.
  • the memory 20 may also be used to temporarily store data that has been or will be output.
  • the memory 20 stores an image processing program 40 based on backlight adjustment.
  • the image processing program 40 based on backlight adjustment can be executed by the processor 10 to implement the image processing method based on backlight adjustment in the present application.
  • the processor 10 may be a central processing unit (CPU), a microprocessor, or other data processing chip, which is used to run the program code or process data stored in the memory 20, for example Perform the image processing method based on backlight adjustment and the like.
  • CPU central processing unit
  • microprocessor or other data processing chip, which is used to run the program code or process data stored in the memory 20, for example Perform the image processing method based on backlight adjustment and the like.
  • the display 30 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode, organic light emitting diode) touch device, or the like.
  • the display 30 is used to display information on the smart TV and to display a visual user interface.
  • the components 10-30 of the smart TV communicate with each other through a system bus.
  • the processor 10 executes the image processing program 40 based on backlight adjustment in the memory 20, the following steps are implemented:
  • the mapped grayscale data is mapped to the PWM dimming duty cycle, and the backlight value is set to the mapped PWM dimming duty cycle.
  • the acquiring and playing the Dolby Vision video source, analyzing the attribute parameters of the Dolby Vision video source through the driving module, and judging whether the preset parameters for realizing the global light control include:
  • the determining whether the preset switch is turned on when the preset parameter exists, and mapping the preset parameter to the preset grayscale value when the preset switch is turned on also includes:
  • the backlight is not adjusted again.
  • the preset gray scale value is a 256-bit gray scale value.
  • the acquiring and playing the Dolby Vision video source, analyzing the attribute parameters of the Dolby Vision video source through the driving module, and determining whether the preset parameters for realizing the global light control include
  • the drive module analyzes the Dolby Vision video source to obtain attribute parameters, and determines whether preset parameters for realizing global light control exist.
  • the method further includes:
  • the preset parameter is separated from the attribute parameter.
  • the determining whether the preset switch is turned on when the preset parameter exists, before mapping the preset parameter and the preset gray scale value when the preset switch is turned on includes:
  • a preset switch for judging whether it is necessary to readjust the backlight parameters is preset.
  • determining whether the preset switch is turned on specifically includes:
  • the mapping of the preset parameter and the preset gray scale value when the preset switch is turned on specifically includes:
  • the preset switch When the preset switch is in the on state, the preset parameter and the 256-bit grayscale value are mapped for the first time.
  • the first mapping process specifically includes:
  • the adjustment range of the TV's backlight adjustment UI is from 0 to 100. Take 5 points 0, 25, 50, 75, 100 and measure the corresponding actual brightness value with the instrument;
  • mapping of the mapped grayscale data and the PWM dimming duty cycle specifically includes:
  • the second mapping process is performed on the 256-bit grayscale data after the first mapping process and the PWM dimming duty cycle.
  • the setting of the backlight value to the mapped PWM dimming duty ratio specifically includes:
  • the 256-bit grayscale data after the first mapping process establishes a linear relationship with the PWM dimming duty cycle.
  • the present disclosure also provides a storage medium, wherein the storage medium stores an image processing program based on backlight adjustment, and the image processing program based on backlight adjustment realizes the image processing based on backlight adjustment as described above when executed by the processor Method steps.
  • the present disclosure provides an image processing method based on backlight adjustment, a smart TV, and a storage medium.
  • the method includes: acquiring and playing a Dolby Vision video source, and analyzing the Dolby Vision video source through a driving module Attribute parameters, and determine whether a preset parameter for realizing global light control exists; when the preset parameter exists, determine whether a preset switch is turned on, and when the preset switch is turned on, set the preset parameter and Set the grayscale value for mapping; map the grayscale data after mapping with the PWM dimming duty cycle, and set the backlight value to the mapped PWM dimming duty cycle.
  • the present disclosure establishes the relationship between the Dolby Vision video source and the TV backlight to ensure that the backlight changes smoothly.
  • the TV backlight is controlled to change in real time according to the corresponding relationship. Different screens of the source dynamically adjust the backlight effect, which improves the playback effect of video images.
  • a computer program instructing relevant hardware (such as a processor, a controller, etc.).
  • the program may include the processes of the foregoing method embodiments when executed.
  • the storage medium may be a memory, a magnetic disk, an optical disk, and so on.

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Abstract

本公开涉及一种基于背光调整的图像处理方法、智能电视及存储介质，所述方法包括：获取并播放杜比视界视频源，通过驱动模块解析所述杜比视界视频源的属性参数，并判断用于实现全域控光的预设参数是否存在；当所述预设参数存在时，判断预设开关是否开启，当所述预设开关开启时将所述预设参数与预设灰阶值进行映射；将映射后的灰阶数据与PWM调光占空比进行映射，并将背光值设置为映射后的PWM调光占空比。本公开通过建立杜比视界视频源与电视背光之间的关系，保证背光的变化是平滑过渡的，当杜比视界视频源参数变化时，控制电视背光根据对应关系实时进行变化，实现了根据片源的不同画面动态调整背光的效果，提升了视频图像的播放效果。

Description

一种基于背光调整的图像处理方法、智能电视及存储介质 技术领域
本公开涉及智能电视技术领域，尤其涉及一种基于背光调整的图像处理方法、智能电视及存储介质。
背景技术
Dolby Vision(杜比视界，通过提升亮度、扩展动态范围来提升影像效果)是美国杜比实验室提出的提高视频信号画质的技术，近几年开始在国内逐渐普及。它从视频制作到显示的整个过程提高亮度扩展动态范围，保留丰富的色彩像素，还原更具层次感的画面，从而展现更好的图像效果。目前越来越多的播放器支持Dolby Vision的解码播放，在线视频服务提供商也提供越来越多的Dolby Vision片源供用户选择。在电视应用领域，Dolby Vision技术是需要片源与电视软硬件相结合实现的，市场主流的LED电视屏幕主要是液晶材料，由横竖规则排列的像素单元构成，通过电压控制像素形成图像，但其本身无法发光需要借助外部背光源，所以不管播放较亮还是较暗的图像，其背光都是保持不变的，所以导致黑色画面黑不下来，还不利于降低功耗，在电视层面无法进一步提高图像效果。
因此，现有技术还有待于改进和发展。
发明内容
本公开要解决的技术问题在于，针对现有技术缺陷，本公开提供一种基于背光调整的图像处理方法、智能电视及存储介质，旨在通过建立杜比视界视频源与电视背光之间的关系，保证背光的变化是平滑过渡的，当杜比视界视频源参数变化时，控制电视背光根据对应关系实时进行变化，实现了根据片源的不同画面动态调整背光的效果，提升了视频图像的播放效果。
本公开解决技术问题所采用的技术方案如下：
一种基于背光调整的图像处理方法，其中，所述基于背光调整的图像处理方法包括：
获取并播放杜比视界视频源，通过驱动模块解析所述杜比视界视频源的属性 参数，并判断用于实现全域控光的预设参数是否存在；
当所述预设参数存在时，判断预设开关是否开启，当所述预设开关开启时将所述预设参数与预设灰阶值进行映射；
将映射后的灰阶数据与PWM调光占空比进行映射，并将背光值设置为映射后的PWM调光占空比。
所述的基于背光调整的图像处理方法，其中，所述获取并播放杜比视界视频源，通过驱动模块解析所述杜比视界视频源的属性参数，并判断用于实现全域控光的预设参数是否存在还包括：
将所述属性参数中用于实现全域控光的预设参数分离出来时，当判断所述预设参数不存在时，则不再重新调整背光。
所述的基于背光调整的图像处理方法，其中，所述当所述预设参数存在时，判断预设开关是否开启，当所述预设开关开启示时将所述预设参数与预设灰阶值进行映射还包括：
当所述预设参数存在且判断预设开关处于关闭状态时，则不再重新调整背光。
所述的基于背光调整的图像处理方法，其中，所述预设灰阶值为256位灰阶值。
所述的基于背光调整的图像处理方法，其中，所述获取并播放杜比视界视频源，通过驱动模块解析所述杜比视界视频源的属性参数，并判断用于实现全域控光的预设参数是否存在具体包括：
通过播放器在资源数据库中获取杜比视界视频源，并开始播放所述杜比视界视频源；
通过驱动模块解析所述杜比视界视频源获取属性参数，判断用于实现全域控光的预设参数是否存在。
所述的基于背光调整的图像处理方法，其中，所述判断用于实现全域控光的预设参数是否存在之后还包括：
当所述预设参数存在时，将所述预设参数从所述属性参数中分离出来。
所述的基于背光调整的图像处理方法，其中，所述当所述预设参数存在时，判断预设开关是否开启，当所述预设开关开启时将所述预设参数与预设灰阶值进行映射之前还包括：
预先设置一用于判断是否需要重新调整背光参数的预设开关。
所述的基于背光调整的图像处理方法，其中，所述当所述预设参数存在时，判断预设开关是否开启具体包括：
当所述预设参数存在且已将所述预设参数从所述属性参数中分离出来后，判断所述预设开关是否处于开启状态。
所述的基于背光调整的图像处理方法，其中，所述当所述预设开关开启时将所述预设参数与预设灰阶值进行映射具体包括：
当所述预设开关处于开启状态时，将所述预设参数与256位灰阶值进行第一次映射处理。
所述的基于背光调整的图像处理方法，其中，第一次映射处理具体包括：
电视机的背光调节UI调节范围为0～100，取5个点0，25，50，75，100分别用仪器测量对应的实际亮度值；
5个实际亮度值对应5个256位灰阶值。所述的基于背光调整的图像处理方法，其中，所述将映射后的灰阶数据与PWM调光占空比进行映射具体包括：
将第一次映射处理后的256位灰阶数据与PWM调光占空比进行第二次映射处理。
所述的基于背光调整的图像处理方法，其中，将背光值设置为映射后的PWM调光占空比具体包括：
将背光值设置为第二次映射处理后的PWM调光占空比。
所述的基于背光调整的图像处理方法，其中，所述将第一次映射处理后的256位灰阶数据与PWM调光占空比进行第二次映射处理之前包括：
所述第一次映射处理后的256位灰阶数据与PWM调光占空比建立线性关系。
一种智能电视，其中，所述智能电视包括：存储器、处理器及存储在所述存储器上并可在所述处理器上运行的基于背光调整的图像处理程序，所述基于背光调整的图像处理程序被所述处理器执行时实现如上所述的基于背光调整的图像处理方法的步骤。
一种存储介质，其中，所述存储介质存储有基于背光调整的图像处理程序，所述基于背光调整的图像处理程序被处理器执行时实现如上所述的基于背光调整的图像处理方法的步骤。
本公开涉及一种基于背光调整的图像处理方法、智能电视及存储介质，所述方法包括：获取并播放杜比视界视频源，通过驱动模块解析所述杜比视界视频源的属性参数，并判断用于实现全域控光的预设参数是否存在；当所述预设参数存在时，判断预设开关是否开启，当所述预设开关开启时将所述预设参数与预设灰阶值进行映射；将映射后的灰阶数据与PWM调光占空比进行映射，并将背光值设置为映射后的PWM调光占空比。本公开通过建立杜比视界视频源与电视背光之间的关系，保证背光的变化是平滑过渡的，当杜比视界视频源参数变化时，控制电视背光根据对应关系实时进行变化，实现了根据片源的不同画面动态调整背光的效果，提升了视频图像的播放效果。
附图说明
图1是本公开基于背光调整的图像处理方法的较佳实施例的流程图；
图2是本公开基于背光调整的图像处理方法的较佳实施例中步骤S10的流程图；
图3是本公开基于背光调整的图像处理方法的较佳实施例中步骤S20的流程图；
图4是本公开基于背光调整的图像处理方法的较佳实施例中步骤S30的流程图；
图5为本公开智能电视的较佳实施例的运行环境示意图。
具体实施方式
为使本公开的目的、技术方案及优点更加清楚、明确，以下参照附图并举实施例对本公开进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本公开，并不用于限定本公开。
实施例一
本公开较佳实施例所述的基于背光调整的图像处理方法，如图1所示，所述基于背光调整的图像处理方法包括以下步骤：
步骤S10、获取并播放杜比视界视频源，通过驱动模块解析所述杜比视界视频源的属性参数，并判断用于实现全域控光的预设参数是否存在。
具体过程请参阅图2，其为本公开提供的基于背光调整的图像处理方法中步骤S10的流程图。
如图2所示，所述步骤S10包括：
S11、通过播放器在资源数据库中获取杜比视界视频源，并开始播放所述杜比视界视频源；
S12、通过驱动模块解析所述杜比视界视频源获取属性参数，判断用于实现全域控光的预设参数是否存在；
S13、当所述预设参数存在时，将所述预设参数从所述属性参数中分离出来。
具体地，杜比视界视频源是指基于杜比视界(Dolby Vision)的视频资源，杜比视界视频源是通过提升亮度、扩展动态范围来提升影像效果的视频，从而让视频的图像的无论从亮度、色彩还是对比度角度看都非常逼真。
由于Dolby Vision片源在播放的过程中参数是不断变化(也就是说Dolby Vision片源在播放过程中参数根据画面不同而变化)，所以需要根据Dolby Vision片源的不同的画面动态调整背光，来达到更好的观看效果。
获取Dolby Vision片源后播放，Dolby Driver(驱动模块)解析DM metadata参数(DolbyVision片源的属性参数称为DM metadata)，分离GD metadata(即预设参数，用于实现全域控光的属性参数)，当此参数不存在时不再重新设置背光，也就是说，将所述属性参数中用于实现全域控光的预设参数分离出来时，当判断所述预设参数不存在时，则不再重新调整背光。
步骤S20、当所述预设参数存在时，判断预设开关是否开启，当所述预设开关开启时将所述预设参数与预设灰阶值进行映射。
具体过程请参阅图3，其为本公开提供的基于背光调整的图像处理方法中步骤S20的流程图。
如图3所示，所述步骤S20包括：
S21、当所述预设参数存在且已将所述预设参数从所述属性参数中分离出来后，判断所述预设开关是否处于开启状态；
S22、当所述预设开关处于开启状态时，将所述预设参数与256位灰阶值进行第一次映射处理。
具体地，其中，所述预设灰阶值为256位灰阶值；预先设置一用于判断是否 需要重新调整(设置)背光参数的预设开关，当分离出GD metadata之后，判断所述预设开关处于开启状态时，将所述预设参数与256位灰阶值进行第一次映射处理(映射是指两个元素的集之间元素相互“对应”的关系)。
图像的亮度层级可以用256位灰阶表示，所谓灰阶，是将最亮与最暗之间的亮度变化，区分为若干份，以便于进行信号输入相对应的屏幕亮度管控，每张数字影像都是由许多点所组合而成的,这些点又称为像素(pixels)，通常每一个像素可以呈现出许多不同的颜色，它是由红、绿、蓝(RGB)三个子像素组成的，每一个子像素，其背后的光源都可以显现出不同的亮度级别，而灰阶代表了由最暗到最亮之间不同亮度的层次级别，这中间层级越多，所能够呈现的画面效果也就越细腻。以8bitpanel为例，能表现2的8次方，等于256个亮度层次，就称之为256灰阶。
进一步地，当所述预设参数存在且判断预设开关处于关闭状态时，则不再重新调整背光，预设开关关闭表示不需要设置背光。
步骤S30、将映射后的灰阶数据与PWM调光占空比进行映射，并将背光值设置为映射后的PWM调光占空比。
具体的过程请参阅图4，其为本公开提供的基于背光调整的图像处理方法中步骤S30的流程图。
如图4所示，所述步骤S30包括：
S31、将第一次映射处理后的256位灰阶数据与PWM调光占空比进行第二次映射处理；
S32、将背光值设置为第二次映射处理后的PWM调光占空比。
具体地，目前电视采用的是PWM占空比调光，电视背光的控制就是PWM信号，调整电视的背光就是调整PWM信号占空比(即PWM调光占空比，PWM，Pulse Width Modulation，脉冲宽度调制，脉冲宽度调制是利用微处理器的数字输出来对模拟电路进行控制的一种非常有效的技术，广泛应用在从测量、通信到功率控制与变换的许多领域中)。
因此，将第一次映射处理后的256位灰阶数据与PWM调光占空比进行第二次映射处理之后，将背光值设置为第二次映射处理后的PWM调光占空比，即达到了根据不同画面动态调整背光的目的。
进一步地，为了更加清楚的解释本公开的技术方案，下面具体进行说明：
播放一个Dolby Vision的片源，此片源每帧画面的DM metadata中包含GD metadata(变化范围为0～4096)，且GD metadata前段画面保持0不变，中段画面保持4096不变，后段画面画面恢复为0保持不变。
目前电视机采用的是PWM占空比调光，得到256位灰阶值后，需要在当Dolby Vision片源播放时，Dolby Driver解析片源的DM metadata，获得GD metadata参数。然后建立GD metadata与256位灰阶值之间的映射，采用的方式为：电视机的背光调节UI调节范围为0～100，步长为1，取5个点0，25，50，75，100分别用仪器测量对应的实际亮度，以Lum0，Lum1，Lum2，Lum3，Lum4表示，这5个点对应的256位灰阶值为0，64，128，192，255，即5个采样点灰阶值对应5个实际亮度值，这样Dolby Driver根据以上设定才会输出GD metada对应的256位灰阶值。
其与PWM占空比建立映射关系，两者之间建立线性关系，表达式为：
GD_PWM＝(Distance Y*Backlight_255/Distance X)+Intercept；
其中，Distance X和Distance Y都是系数，线性表达式的系数为：
DistanceY＝ucY1-ucY0
DistanceX＝ucX1-ucX0
Intercept＝ucY0；
线性表达式的系数的计算方法为：
当Backlight_255<＝64时，
ucY0＝PWM_V0
ucY1＝PWM_V64
ucX0＝0
ucX1＝64；
当Backlight_255<＝128时，
ucY0＝PWM_V64
ucY1＝PWM_V128
ucX0＝64
ucX1＝128；
当Backlight_255<＝192时，
ucY0＝PWM_V128
ucY1＝PWM_V192
ucX0＝128
ucX1＝192；
当Backlight_255<＝255时，
ucY0＝PWM_V192
ucY1＝PWM_V255
ucX0＝192
ucX1＝255；
其中PWM_V0,PWM_V64,PWM_V128,PWM_V192,PWM_V255为背光UI中0，25，50，75，100对应的PWM占空比，0，64，128，192，255为256位灰阶值均分四段取5个值。
根据上述表达式算出的值即为设置的背光值。
本公开建立了Dolby Vision片源与电视背光之间的关系，保证背光的变化是平滑过渡不突兀，当片源参数变化时，背光的变化是实时的且保持同步，为图像效果的提升提供了新的方向。
实施例二
如图5所示，基于上述基于背光调整的图像处理方法，本公开还相应提供了一种智能电视，所述智能电视包括处理器10、存储器20及显示器30(连接有显示屏的情况下或者外接显示屏的情况)。图5仅示出了智能电视的部分组件，但是应理解的是，并不要求实施所有示出的组件，可以替代的实施更多或者更少的组件。
所述存储器20在一些实施例中可以是所述智能电视的内部存储单元，例如智能电视的硬盘或内存。所述存储器20在另一些实施例中也可以是所述智能电视的外部存储设备，例如所述智能电视上配备的插接式硬盘，智能存储卡(Smart Media Card,SMC)，安全数字(Secure Digital,SD)卡，闪存卡(Flash Card)等。进一步地，所述存储器20还可以既包括所述智能电视的内部存储单元也包括外部存储设备。所述存储器20用于存储安装于所述智能电视的应用软件及各类数据，例如所述安装智能电视的程序代码等。所述存储器20还可以用于暂时地存储已经输出或者将要输出的数据。在一实施例中，存储器20上存储有基于背光 调整的图像处理程序40，该基于背光调整的图像处理程序40可被处理器10所执行，从而实现本申请中基于背光调整的图像处理方法。
所述处理器10在一些实施例中可以是一中央处理器(Central Processing Unit,CPU)，微处理器或其他数据处理芯片，用于运行所述存储器20中存储的程序代码或处理数据，例如执行所述基于背光调整的图像处理方法等。
所述显示器30在一些实施例中可以是LED显示器、液晶显示器、触控式液晶显示器以及OLED(Organic Light-Emitting Diode，有机发光二极管)触摸器等。所述显示器30用于显示在所述智能电视的信息以及用于显示可视化的用户界面。所述智能电视的部件10-30通过系统总线相互通信。在一实施例中，当处理器10执行所述存储器20中基于背光调整的图像处理程序40时实现以下步骤：
获取并播放杜比视界视频源，通过驱动模块解析所述杜比视界视频源的属性参数，并判断用于实现全域控光的预设参数是否存在；
当所述预设参数存在时，判断预设开关是否开启，当所述预设开关开启时将所述预设参数与预设灰阶值进行映射；
将映射后的灰阶数据与PWM调光占空比进行映射，并将背光值设置为映射后的PWM调光占空比。
所述获取并播放杜比视界视频源，通过驱动模块解析所述杜比视界视频源的属性参数，并判断用于实现全域控光的预设参数是否存在还包括：
将所述属性参数中用于实现全域控光的预设参数分离出来时，当判断所述预设参数不存在时，则不再重新调整背光。
所述当所述预设参数存在时，判断预设开关是否开启，当所述预设开关开启示时将所述预设参数与预设灰阶值进行映射还包括：
当所述预设参数存在且判断预设开关处于关闭状态时，则不再重新调整背光。
其中，所述预设灰阶值为256位灰阶值。
所述获取并播放杜比视界视频源，通过驱动模块解析所述杜比视界视频源的属性参数，并判断用于实现全域控光的预设参数是否存在具体包括：
通过播放器在资源数据库中获取杜比视界视频源，并开始播放所述杜比视界视频源；
通过驱动模块解析所述杜比视界视频源获取属性参数，判断用于实现全域控 光的预设参数是否存在。
所述判断用于实现全域控光的预设参数是否存在之后还包括：
当所述预设参数存在时，将所述预设参数从所述属性参数中分离出来。
所述当所述预设参数存在时，判断预设开关是否开启，当所述预设开关开启时将所述预设参数与预设灰阶值进行映射之前还包括：
预先设置一用于判断是否需要重新调整背光参数的预设开关。
所述当所述预设参数存在时，判断预设开关是否开启，具体包括：
当所述预设参数存在且已将所述预设参数从所述属性参数中分离出来后，判断所述预设开关是否处于开启状态。
所述当所述预设开关开启时将所述预设参数与预设灰阶值进行映射具体包括：
当所述预设开关处于开启状态时，将所述预设参数与256位灰阶值进行第一次映射处理。
所述第一次映射处理具体包括：
电视机的背光调节UI调节范围为0～100，取5个点0，25，50，75，100分别用仪器测量对应的实际亮度值；
5个实际亮度值对应5个256位灰阶值。
所述将映射后的灰阶数据与PWM调光占空比进行映射具体包括：
将第一次映射处理后的256位灰阶数据与PWM调光占空比进行第二次映射处理。
所述将背光值设置为映射后的PWM调光占空比具体包括：
将背光值设置为第二次映射处理后的PWM调光占空比。
所述将第一次映射处理后的256位灰阶数据与PWM调光占空比进行第二次映射处理之前包括：
所述第一次映射处理后的256位灰阶数据与PWM调光占空比建立线性关系。
本公开还提供一种存储介质，其中，所述存储介质存储有基于背光调整的图像处理程序，所述基于背光调整的图像处理程序被处理器执行时实现如上所述的基于背光调整的图像处理方法的步骤。
综上所述，本公开提供一种基于背光调整的图像处理方法、智能电视及存储 介质，所述方法包括：获取并播放杜比视界视频源，通过驱动模块解析所述杜比视界视频源的属性参数，并判断用于实现全域控光的预设参数是否存在；当所述预设参数存在时，判断预设开关是否开启，当所述预设开关开启时将所述预设参数与预设灰阶值进行映射；将映射后的灰阶数据与PWM调光占空比进行映射，并将背光值设置为映射后的PWM调光占空比。本公开通过建立杜比视界视频源与电视背光之间的关系，保证背光的变化是平滑过渡的，当杜比视界视频源参数变化时，控制电视背光根据对应关系实时进行变化，实现了根据片源的不同画面动态调整背光的效果，提升了视频图像的播放效果。
当然，本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关硬件(如处理器，控制器等)来完成，所述的程序可存储于一计算机可读取的存储介质中，所述程序在执行时可包括如上述各方法实施例的流程。其中所述的存储介质可为存储器、磁碟、光盘等。
应当理解的是，本公开的应用不限于上述的举例，对本领域普通技术人员来说，可以根据上述说明加以改进或变换，所有这些改进和变换都应属于本公开所附权利要求的保护范围。

Claims (15)

  1. 一种基于背光调整的图像处理方法，其特征在于，所述基于背光调整的图像处理方法包括：
    获取并播放杜比视界视频源，通过驱动模块解析所述杜比视界视频源的属性参数，并判断用于实现全域控光的预设参数是否存在；
    当所述预设参数存在时，判断预设开关是否开启，当所述预设开关开启时将所述预设参数与预设灰阶值进行映射；
    将映射后的灰阶数据与PWM调光占空比进行映射，并将背光值设置为映射后的PWM调光占空比。
  2. 根据权利要求1所述的基于背光调整的图像处理方法，其特征在于，所述获取并播放杜比视界视频源，通过驱动模块解析所述杜比视界视频源的属性参数，并判断用于实现全域控光的预设参数是否存在还包括：
    将所述属性参数中用于实现全域控光的预设参数分离出来时，当判断所述预设参数不存在时，则不再重新调整背光。
  3. 根据权利要求1所述的基于背光调整的图像处理方法，其特征在于，所述当所述预设参数存在时，判断预设开关是否开启，当所述预设开关开启示时将所述预设参数与预设灰阶值进行映射还包括：
    当所述预设参数存在且判断预设开关处于关闭状态时，则不再重新调整背光。
  4. 根据权利要求1所述的基于背光调整的图像处理方法，其特征在于，所述预设灰阶值为256位灰阶值。
  5. 根据权利要求1所述的基于背光调整的图像处理方法，其特征在于，所述获取并播放杜比视界视频源，通过驱动模块解析所述杜比视界视频源的属性参数，并判断用于实现全域控光的预设参数是否存在具体包括：
    通过播放器在资源数据库中获取杜比视界视频源，并开始播放所述杜比视界视频源；
    通过驱动模块解析所述杜比视界视频源获取属性参数，判断用于实现全域控光的预设参数是否存在。
  6. 根据权利要求5所述的基于背光调整的图像处理方法，其特征在于，所述判断用于实现全域控光的预设参数是否存在之后还包括：当所述预设参数存在时，将所述预设参数从所述属性参数中分离出来。
  7. 根据权利要求6所述的基于背光调整的图像处理方法，其特征在于，所述当所述预设参数存在时，判断预设开关是否开启，当所述预设开关开启时将所述预设参数与预设灰阶值进行映射之前还包括：
    预先设置一用于判断是否需要重新调整背光参数的预设开关。
  8. 根据权利要求7所述的基于背光调整的图像处理方法，其特征在于，所述当所述预设参数存在时，判断预设开关是否开启具体包括：
    当所述预设参数存在且已将所述预设参数从所述属性参数中分离出来后，判断所述预设开关是否处于开启状态。
  9. 根据权利要求8所述的基于背光调整的图像处理方法，其特征在于，所述当所述预设开关开启时将所述预设参数与预设灰阶值进行映射具体包括：
    当所述预设开关处于开启状态时，将所述预设参数与256位灰阶值进行第一次映射处理。
  10. 根据权利要求9所述的基于背光调整的图像处理方法，其特征在于，所述第一次映射处理具体包括：
    电视机的背光调节UI调节范围为0～100，取5个点0，25，50，75，100分别用仪器测量对应的实际亮度值；
    5个实际亮度值对应5个256位灰阶值。
  11. 根据权利要求9所述的基于背光调整的图像处理方法，其特征在于，所述将映射后的灰阶数据与PWM调光占空比进行映射具体包括：
    将第一次映射处理后的256位灰阶数据与PWM调光占空比进行第二次映射处理。
  12. 根据权利要求10所述的基于背光调整的图像处理方法，其特征在于，所述将背光值设置为映射后的PWM调光占空比具体包括：
    将背光值设置为第二次映射处理后的PWM调光占空比。
  13. 根据权利要求11所述的基于背光调整的图像处理方法，其特征在于，所述将第一次映射处理后的256位灰阶数据与PWM调光占空比进行第二次映射处理之前包括：
    所述第一次映射处理后的256位灰阶数据与PWM调光占空比建立线性关系。
  14. 一种智能电视，其特征在于，所述智能电视包括：存储器、处理器及存 储在所述存储器上并可在所述处理器上运行的基于背光调整的图像处理程序，所述基于背光调整的图像处理程序被所述处理器执行时实现如权利要求1-13任一项所述的基于背光调整的图像处理方法的步骤。
  15. 一A种存储介质，其特征在于，所述存储介质存储有基于背光调整的图像处理程序，所述基于背光调整的图像处理程序被处理器执行时实现如权利要求1-13任一项所述的基于背光调整的图像处理方法的步骤。
PCT/CN2019/102436 2018-12-21 2019-08-26 一种基于背光调整的图像处理方法、智能电视及存储介质 WO2020125049A1 (zh)

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