WO2019010801A1 - 适用rgbw显示的分区背光显示方法及装置 - Google Patents

适用rgbw显示的分区背光显示方法及装置 Download PDF

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Publication number
WO2019010801A1
WO2019010801A1 PCT/CN2017/101159 CN2017101159W WO2019010801A1 WO 2019010801 A1 WO2019010801 A1 WO 2019010801A1 CN 2017101159 W CN2017101159 W CN 2017101159W WO 2019010801 A1 WO2019010801 A1 WO 2019010801A1
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rgb
pixel
pixels
saturation
rgbw
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PCT/CN2017/101159
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English (en)
French (fr)
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查国伟
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武汉华星光电技术有限公司
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Priority to US15/574,360 priority Critical patent/US10629140B2/en
Publication of WO2019010801A1 publication Critical patent/WO2019010801A1/zh

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    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
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    • 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
    • G09G3/34—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 by control of light from an independent source
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    • 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
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    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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    • 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
    • G09G3/34—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 by control of light from an independent source
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    • 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
    • G09G3/34—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 by control of light from an independent source
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    • G09G3/34—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 by control of light from an independent source
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    • G09G3/3607—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 by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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Definitions

  • the present invention relates to the field of liquid crystal display, and in particular to a partitioned backlight display method and apparatus suitable for RGBW display.
  • LCD display technology still has obvious advantages in terms of cost and reliability.
  • OLED technology still faces problems such as high cost and limited life.
  • OLED display technology has gradually narrowed the distance from LCD display technology, and OLED display technology has the advantages of high color gamut and high contrast.
  • the dynamic partition backlight enables the backlights of different partitions to independently adjust the brightness of the partition backlight according to the content of the current display screen.
  • the adjustment of the backlight is still limited to a large range of a single partition, and the pixels in any partition still share the backlight of the same brightness, which is difficult to match the self-luminous adjustment effect of the OLED single sub-pixel.
  • RGBW Four-color display technology
  • white pixels typically use a high-transmittance OC flat layer instead of a low-transmission color resist layer
  • the RGB pixel arrangement has the advantages of high brightness and low power consumption.
  • the brightness of the liquid crystal display module based on the conventional RGB pixel arrangement reaches a level of 400-500 nits, and the transmittance of the W sub-pixel is increased by about 100-150% with respect to the transmittance of the RGB pixel, thereby achieving a maximum of about 700-1200 nits. brightness.
  • the display brightness of a single pixel can be adjusted at the pixel level, and has a similar function of "dynamic backlight", so that the LCD technology has a dynamic backlight adjustment level comparable to that of the OLED.
  • the invention provides a partition backlight display method suitable for RGBW display, comprising the following steps:
  • each of the RGB pixels Determining, according to the saturation, each of the RGB pixels as a high-purity color RGB pixel or a non-high-purity color RGB pixel, and generating a determination result;
  • the target backlight is obtained according to a grayscale value of each of the RGBW pixels in each of the image partitions and a saturation gain threshold corresponding to the image partition.
  • the steps of brightness gain include:
  • the step of optimizing the target saturation gain of each RGB pixel in the image partition according to the saturation gain threshold includes:
  • the target saturation gain of one RGB pixel in the image partition is greater than the corresponding saturation gain threshold, the target saturation gain of the RGB pixel is adjusted to the corresponding saturation gain threshold.
  • the saturation gain of each of the RGB pixels is corrected according to the determination result and the visual brightness gain coefficient of each RGB pixel to obtain a correction.
  • the steps of the target saturation gain afterwards include:
  • the target saturation gain n m
  • m is the saturation gain of the RGB pixel.
  • the grayscale value of each of the RGB pixels is acquired, and the grayscale value of the RGB pixel is converted into an HSV space to acquire the RGB.
  • the steps of pixel saturation include:
  • the invention also has a partitioned backlight display device suitable for RGBW display, comprising:
  • a dividing module configured to divide the RGB image into a plurality of image partitions according to the backlight partition setting information, each of the image partitions including a plurality of RGB pixels;
  • a first acquiring module configured to acquire a grayscale value of each of the RGB pixels, and convert a grayscale value of the RGB pixel into an HSV space to obtain a saturation of the RGB pixel;
  • a determining module configured to determine, according to the saturation, each of the RGB pixels as a high-purity color RGB pixel or a non-high-purity color RGB pixel, and generate a determination result
  • a second acquiring module configured to acquire a saturation gain corresponding to each of the RGB pixels when each of the RGB pixels is pre-converted into RGBW pixels;
  • a correction module configured to correct a saturation gain of each of the RGB pixels according to the determination result and a visual brightness gain coefficient of each of the RGB pixels to obtain a corrected target saturation gain
  • An optimization module configured to set a saturation gain threshold corresponding to each of the image partitions, and perform an optimization processing operation on a target saturation gain of each RGB pixel in the image partition according to the saturation gain threshold;
  • a third acquiring module configured to convert the RGB pixel into an RGBW pixel according to the target saturation gain after the optimization process, and acquire a grayscale value of the RGBW pixel;
  • a fourth acquiring module configured to acquire a target backlight brightness gain coefficient according to a grayscale value of each of the RGBW pixels in each of the image partitions and a saturation gain threshold corresponding to the image partition;
  • a fifth obtaining module configured to acquire a grayscale compensation screen of the image partition according to a target backlight luminance gain coefficient of the image partition and a grayscale value of the RGBW pixel in the image partition;
  • a display module configured to display according to the grayscale compensation screen of each image partition.
  • the fourth acquiring module includes:
  • a setting unit configured to set, according to a grayscale value of each of the RGBW pixels in each of the image partitions, a backlight brightness gain coefficient in the image partition;
  • a correction unit configured to correct the backlight brightness gain coefficient in the image partition according to the saturation gain threshold corresponding to the image partition to obtain a target backlight brightness gain coefficient.
  • the optimization module includes:
  • a first setting unit configured to set a saturation gain threshold corresponding to each of the image partitions
  • an optimization unit configured to adjust a target saturation gain of the RGB pixel to a corresponding saturation gain threshold when a target saturation gain of an RGB pixel in the image partition is greater than a corresponding saturation gain threshold.
  • the correction module includes:
  • a first obtaining unit configured to acquire a visual brightness gain coefficient x of each RGB pixel
  • a second setting unit configured to set a target saturation gain of the RGB pixel to mx when the RGB pixel is a high-purity color RGB pixel;
  • a third setting unit configured to set the target saturation gain to m when the RGB pixel is a high-purity color RGB pixel;
  • m is the saturation gain of the RGB pixel.
  • the first acquiring module includes:
  • a normalization unit configured to normalize the RGB pixels, and obtain a grayscale value of the normalized RGB pixels
  • a second acquiring unit configured to convert a grayscale value of the RGB pixel to an HSV space to obtain saturation of the RGB pixel.
  • the present invention converts the RGB display into RGBW display, avoiding the problem of solid color darkness caused by inconsistent gain of different pixels, and the saturation gain value in different partitions can be independently set according to a specific screen, thereby maximizing the W sub-pixel.
  • the brightness gain effect increases the penetration rate.
  • FIG. 1 is a flow chart of a method of displaying a partitioned backlight suitable for RGBW display in a preferred embodiment of the present invention.
  • FIG. 2 is a block diagram showing the structure of a partitioned backlight display device suitable for RGBW display in a preferred embodiment of the present invention.
  • FIG. 1 is a flow chart of a method for displaying a partition backlight suitable for RGBW display in a preferred embodiment of the present invention. The method includes the following steps:
  • S110 Display according to the grayscale compensation screen of each image partition.
  • each RGB pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel.
  • the backlight partition setting information is divided according to the display content of the screen.
  • step S102 before the step of acquiring the grayscale value of each of the RGB pixels, it is necessary to perform normalization processing on each image partition.
  • normalization processing can be performed by gamma conversion rules to normalize each image partition.
  • the step S102 includes the following sub-steps:
  • S1021 Perform normalization processing on the RGB pixels, and obtain grayscale values of the normalized RGB pixels.
  • S1022 Convert a grayscale value of the RGB pixel to an HSV space to obtain saturation of the RGB pixel.
  • each RGB pixel grayscale value before the normalization process is labeled as Pic(H, L, a), where H and L are the abscissa and the ordinate of the subpixel, respectively, and a is used to identify the subpixel.
  • gamma 2.2
  • the grayscale values of the respective sub-pixels are converted to the HSV space to obtain the saturation of the RGB pixels.
  • the main screening colors are R (red), G (green), B (blue), C (cyan), M (purple), and Y (yellow).
  • the determination that the saturation of the RGB pixel is higher is a high-purity color pixel, and the determination that the saturation is lower than the threshold is a non-high-purity color pixel.
  • the pixels are calibrated for the above several colors.
  • the threshold can be set with reference to the image taste, and in the present embodiment, the threshold is set to 0.8.
  • each RGB pixel is pre-converted into RGBW pixels, and the conversion is not actually performed here, just to obtain the saturation gain corresponding to the sub-pixels of the respective RGB pixels at the time of conversion.
  • the RGBW pixels include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel.
  • the visual brightness gain coefficients corresponding to R (red), G (green), B (blue), C (cyan), M (purple), and Y (yellow) are set to 1.5, 1.2, 1.5, 1.35, 1.5, and 1.1, respectively.
  • For high-purity color pixels multiply the visual brightness gain coefficients corresponding to R (red), G (green), B (blue), C (cyan), M (purple), and Y (yellow) for non-high-purity color pixels. Multiply by 1 to get the target saturation gain.
  • step S106 it is necessary to first count the target saturation gain situation of each RGB pixel. Then, according to the statistical situation, for each different image partition, a saturation gain threshold gain_final is set, and then the grayscale value of the RGB pixels in the image partition is optimized according to the saturation threshold gain_final.
  • the target saturation gain of one RGB pixel in the image partition is greater than the corresponding saturation gain threshold
  • the target saturation gain of the RGB pixel is adjusted to a corresponding saturation gain threshold.
  • step S107 the RGB pixels are converted into RGBW pixels according to the target saturation gain after the optimization processing, and the grayscale values of the sub-pixels of the respective RGBW pixels are acquired.
  • an RGBW pixel its grayscale value is recorded as (Rin, Gin, Bin, Win).
  • step S108 the step includes the following sub-steps:
  • S1081 Set a backlight brightness gain coefficient in the image partition according to a grayscale value of each RGBW pixel in each image partition.
  • S1082 Correct the backlight brightness gain coefficient in the image partition according to a saturation gain threshold corresponding to the image partition to obtain a target backlight brightness gain coefficient.
  • the grayscale compensation image out is calculated according to the grayscale values (Rin, Gin, Bin, Win) of the converted RGBW pixels and the determined target backlight luminance gain coefficient Blu.
  • step S110 the de-gamma operation corresponding to the gamma normalization is used, and the out of each RGBW pixel is taken out. (H, W, b) is restored to gray scale and output to the image controller to control the display of the image.
  • the present invention can reduce the solid color darkness caused by the inconsistent gain of different pixels by converting the RGB display into RGBW display, and the saturation gain value in different partitions can be independently set according to the specific screen, which can be maximized. Improve the brightness gain effect of the W sub-pixel to increase the transmittance.
  • FIG. 2 is a partitioned backlight display device for RGBW display according to an embodiment of the present invention, including: a partitioning module 201, a first obtaining module 202, a determining module 203, a second acquiring module 204, and a correcting module 205.
  • the dividing module 201 is configured to divide the RGB image into a plurality of image partitions according to the backlight partition setting information, and each of the image partitions includes a plurality of RGB pixels.
  • the first obtaining module 202 is configured to obtain grayscale values of each of the RGB pixels, and convert the grayscale values of the RGB pixels into an HSV space to obtain saturation of the RGB pixels.
  • the first obtaining module includes: a normalization unit, configured to normalize the RGB pixels, and obtain a grayscale value of the normalized RGB pixels; and a second acquiring unit, configured to: the RGB pixels The grayscale value is converted to the HSV space to obtain the saturation of the RGB pixel.
  • the determining module 203 is configured to determine, according to the saturation, that each of the RGB pixels is a high-purity color RGB pixel or a non-high-purity color RGB pixel, and generate a determination result.
  • the second obtaining module 204 is configured to acquire a saturation gain corresponding to each of the RGB pixels when each of the RGB pixels is pre-converted into RGBW pixels.
  • the correction module 205 is configured to correct a saturation gain of each of the RGB pixels according to the determination result and a visual brightness gain coefficient of each of the RGB pixels to obtain a corrected target saturation gain.
  • the correction module 205 includes: a first acquiring unit, configured to acquire a visual brightness gain coefficient x of each RGB pixel; and a second setting unit, configured to: when the RGB pixel is a high-purity color RGB pixel, the target of the RGB pixel The saturation gain is set to mx; a third setting unit is configured to set the target saturation gain to m when the RGB pixel is a high-purity color RGB pixel; wherein m is a saturation gain of the RGB pixel.
  • the optimization module 206 is configured to set a saturation gain threshold corresponding to each of the image partitions, and perform optimization processing operations on target saturation gains of the respective RGB pixels in the image partition according to the saturation gain threshold.
  • the optimization module 206 includes: a first setting unit, configured to set a saturation gain threshold corresponding to each of the image partitions; and an optimization unit, configured to: when a target saturation gain of an RGB pixel in the image partition is greater than a corresponding At the saturation gain threshold, the target saturation gain of the RGB pixel is adjusted to the corresponding saturation gain threshold.
  • the third obtaining module 207 is configured to convert the RGB pixels into RGBW pixels according to the target saturation gain after the optimization process, and acquire grayscale values of the RGBW pixels.
  • the fourth obtaining module 208 is configured to obtain a target backlight brightness gain coefficient according to a grayscale value of each of the RGBW pixels in each of the image partitions and a saturation gain threshold corresponding to the image partition.
  • the fourth obtaining module 208 includes: a setting unit, configured to set, according to a grayscale value of each of the RGBW pixels in each of the image partitions, a backlight brightness gain coefficient in the image partition; a correction unit, configured to The saturation gain threshold corresponding to the image partition is corrected for the backlight luminance gain coefficient in the image partition to obtain a target backlight luminance gain coefficient.
  • the fifth obtaining module 209 is configured to obtain a grayscale compensation screen of the image partition according to the target backlight luminance gain coefficient of the image partition and the grayscale value of the RGBW pixel in the image partition.
  • the display module 210 is configured to display according to the grayscale compensation screen of each image partition.
  • the present invention converts the RGB display into RGBW display, avoiding the problem of solid color darkness caused by inconsistent gain of different pixels, and the saturation gain value in different partitions can be independently set according to a specific screen, thereby maximizing the W sub-pixel.
  • the brightness gain effect increases the penetration rate.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

一种适用RGBW显示的分区背光显示方法及装置。该方法通过将RGB显示转换RGBW显示，避免由于不同像素增益不一致导致的纯色偏暗问题，同时不同分区内的饱和度增益值可根据具体画面独立设置，能够最大限度提升W子像素的亮度增益效果提升穿透率。

Description

适用RGBW显示的分区背光显示方法及装置 技术领域
本发明涉及液晶显示领域，特别是涉及一种适用RGBW显示的分区背光显示方法及装置。
 背景技术
显示技术的核心在于再现人眼对于自然界的视觉认知。目前主流的显示技术包括LCD显示技术和OLED显示技术。其中LCD显示技术在成本、可靠性方面依然具有明显的优势。而OLED技术作为起步较晚的显示技术，依然面临着成本较高、寿命受限等问题。
但是随着技术的进步和供应链的改善，OLED显示技术已经逐渐拉近与LCD显示技术的距离，OLED显示技术同时具备高色域和高对比度等优势。
动态分区背光使得不同分区的背光可以根据当前显示画面的内容独立调整分区背光的亮度。但背光的调节依然限定在单个分区的较大范围内，任意分区内的像素仍然共用相同亮度的背光，难以匹敌OLED单个子像素自发光的调节效果。
四色显示技术（如RGBW）通过在传统RGB色阻排列的基础上增加白色W画素，由于通常白色画素W采用高透过率的OC平坦层替代低透过率的色阻层，因而相对于RGB画素排列具有高亮度、低功耗的优势。 目前基于传统RGB画素排列的液晶显示模组亮度达到400-500nits水平，而W子像素的穿透率相对于RGB像素的穿透率提高100-150%左右，因而可以实现最高700-1200nits左右的亮度。同时W作为单个子像素能够在像素水平调节单个像素的显示亮度，具有“动态背光”类似的功能，使得LCD技术具有与OLED相匹敌的动态背光调整水平。
另一方面，如何采用合适的演算法将分区背光与RGBW显示技术相结合也是实现该技术的难点。
因此，现有技术存在缺陷，急需改进。
 技术问题
本发明的目的在于提供适用RGBW显示的分区背光显示方法及装置，从而实现适用RGBW的分区背光显示功能。
 技术解决方案
为解决上述问题，本发明提供的技术方案如下：
本发明提供了一种适用RGBW显示的分区背光显示方法，包括以下步骤：
根据背光分区设置信息将RGB图像划分成多个图像分区，每一所述图像分区包括多个RGB像素；
获取每一所述RGB像素的灰阶值，并将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度；
根据所述饱和度判断每一所述RGB像素为高纯度颜色RGB像素或非高纯度颜色RGB像素，并生成判断结果；
获取将各个所述RGB像素预转换为RGBW像素时，各个所述RGB像素对应的饱和度增益；
根据所述判断结果以及每一所述RGB像素的视觉亮度增益系数对每一所述RGB像素的饱和度增益进行修正，以得到修正后的目标饱和度增益；
对每一所述图像分区对应设置一饱和度增益阈值，并根据所述饱和度增益阈值对所述图像分区内的各个RGB像素的目标饱和度增益进行优化处理操作，以得到优化处理后的目标饱和度增益；
根据优化处理后的目标饱和度增益将所述RGB像素转换为RGBW像素，并获取所述RGBW像素的灰阶值；
根据每一所述图像分区内的各个所述RGBW像素的灰阶值以及所述图像分区对应的饱和度增益阈值获取目标背光亮度增益系数；
根据所述图像分区的目标背光亮度增益系数以及该图像分区内的RGBW像素的灰阶值，获取该图像分区的灰阶补偿画面；
根据所述各个图像分区的灰阶补偿画面进行显示。
在本发明所述的适用RGBW显示的分区背光显示方法中，所述根据每一所述图像分区内的各个所述RGBW像素的灰阶值以及所述图像分区对应的饱和度增益阈值获取目标背光亮度增益的步骤包括：
根据每一所述图像分区内各个所述RGBW像素的灰阶值设定该图像分区内的背光亮度增益系数；
根据所述图像分区对应的所述饱和度增益阈值对该图像分区内的所述背光亮度增益系数进行修正，以得到目标背光亮度增益系数。
在本发明所述的适用RGBW显示的分区背光显示方法中，所述根据所述饱和度增益阈值对所述图像分区内的各个RGB像素的目标饱和度增益进行优化处理操作的步骤包括：
当所述图像分区内的一RGB像素的目标饱和度增益大于对应的饱和度增益阈值时，将该RGB像素的目标饱和度增益调整为对应的所述饱和度增益阈值。
在本发明所述的适用RGBW显示的分区背光显示方法中，所述根据所述判断结果以及每一RGB像素的视觉亮度增益系数对每一所述RGB像素的饱和度增益进行修正，以得到修正后的目标饱和度增益的步骤包括：
获取每一RGB像素的视觉亮度增益系数x；
当所述RGB像素为高纯度颜色RGB像素时，该RGB像素的目标饱和度增益有n=mx；
当所述RGB像素为高纯度颜色RGB像素时，所述目标饱和度增益n=m；
其中，m为该RGB像素的饱和度增益。
在本发明所述的适用RGBW显示的分区背光显示方法中，所述获取每一所述RGB像素的灰阶值，并将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度的步骤包括：
对所述RGB像素进行归一化处理，并获取归一化后的RGB像素的灰阶值；
将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度。
本发明还一种适用RGBW显示的分区背光显示装置，包括：
划分模块，用于根据背光分区设置信息将RGB图像划分成多个图像分区，每一所述图像分区包括多个RGB像素；
第一获取模块，用于获取每一所述RGB像素的灰阶值，并将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度；
判断模块，用于根据所述饱和度判断每一所述RGB像素为高纯度颜色RGB像素或非高纯度颜色RGB像素，并生成判断结果；
第二获取模块，用于获取将各个所述RGB像素预转换为RGBW像素时，各个所述RGB像素对应的饱和度增益；
修正模块，用于根据所述判断结果以及每一所述RGB像素的视觉亮度增益系数对每一所述RGB像素的饱和度增益进行修正，以得到修正后的目标饱和度增益；
优化模块，用于对每一所述图像分区对应设置一饱和度增益阈值，并根据所述饱和度增益阈值对所述图像分区内的各个RGB像素的目标饱和度增益进行优化处理操作；
第三获取模块，用于根据优化处理后的目标饱和度增益将所述RGB像素转换为RGBW像素，并获取所述RGBW像素的灰阶值；
第四获取模块，用于根据每一所述图像分区内的各个所述RGBW像素的灰阶值以及所述图像分区对应的饱和度增益阈值获取目标背光亮度增益系数；
第五获取模块，用于根据所述图像分区的目标背光亮度增益系数以及该图像分区内的RGBW像素的灰阶值，获取该图像分区的灰阶补偿画面；
显示模块，用于根据所述各个图像分区的灰阶补偿画面进行显示。
在本发明所述的适用RGBW显示的分区背光显示装置中，所述第四获取模块包括：
设定单元，用于根据每一所述图像分区内各个所述RGBW像素的灰阶值设定该图像分区内的背光亮度增益系数；
修正单元，用于根据所述图像分区对应的所述饱和度增益阈值对该图像分区内的所述背光亮度增益系数进行修正，以得到目标背光亮度增益系数。
在本发明所述的适用RGBW显示的分区背光显示装置中，所述优化模块包括：
第一设置单元，用于对每一所述图像分区对应设置一饱和度增益阈值；
优化单元，用于当所述图像分区内的一RGB像素的目标饱和度增益大于对应的饱和度增益阈值时，将该RGB像素的目标饱和度增益调整为对应的所述饱和度增益阈值。
在本发明所述的适用RGBW显示的分区背光显示装置中，所述修正模块包括：
第一获取单元，用于获取每一RGB像素的视觉亮度增益系数x；
第二设置单元，用于当所述RGB像素为高纯度颜色RGB像素时，将该RGB像素的目标饱和度增益设置为mx；
第三设置单元，用于当所述RGB像素为高纯度颜色RGB像素时，将所述目标饱和度增益设置为m；
其中，m为该RGB像素的饱和度增益。
在本发明所述的适用RGBW显示的分区背光显示装置中，所述第一获取模块包括：
归一化单元，用于对所述RGB像素进行归一化处理，并获取归一化后的RGB像素的灰阶值；
第二获取单元，用于将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度。
 有益效果
由上可知，本发明通过将RGB显示转换RGBW显示，避免由于不同像素增益不一致导致的纯色偏暗问题，同时不同分区内的饱和度增益值可根据具体画面独立设置，能够最大限度提升W子像素的亮度增益效果提升穿透率。
 附图说明
图1是本发明的一优选实施例中的适用RGBW显示的分区背光显示方法的流程图。
图2是本发明的一优选实施例中的适用RGBW显示的分区背光显示装置的结构示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
在图中，结构相似的模块是以相同标号表示。
请参照图1，图1是本发明一优选实施例中的适用RGBW显示的分区背光显示方法的流程图。该方法包括以下步骤：
S101、根据背光分区设置信息将RGB图像划分成多个图像分区，每一所述图像分区包括多个RGB像素；
S102、获取每一所述RGB像素的灰阶值，并将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度；
S103、根据所述饱和度判断每一所述RGB像素为高纯度颜色RGB像素或非高纯度颜色RGB像素，并生成判断结果；
S104、获取将各个所述RGB像素预转换为RGBW像素时，各个所述RGB像素对应的饱和度增益；
S105、根据所述判断结果以及每一所述RGB像素的视觉亮度增益系数对每一所述RGB像素的饱和度增益进行修正，以得到修正后的目标饱和度增益；
S106、对每一所述图像分区对应设置一饱和度增益阈值，并根据所述饱和度增益阈值对所述图像分区内的各个RGB像素的目标饱和度增益进行优化处理操作；
S107、根据优化处理后的目标饱和度增益将所述RGB像素转换为RGBW像素，并获取所述RGBW像素的灰阶值；
S108、根据每一所述图像分区内的各个所述RGBW像素的灰阶值以及所述图像分区对应的饱和度增益阈值获取目标背光亮度增益系数；
S109、根据所述图像分区的目标背光亮度增益系数以及该图像分区内的RGBW像素的灰阶值，获取该图像分区的灰阶补偿画面；
S110、根据所述各个图像分区的灰阶补偿画面进行显示。
下面结合附图给该分区背光显示方法的各个步骤进行详细说明。
在步骤S101中，每一RGB像素包括红色子像素、绿色子像素以及蓝色子像素。该背光分区设置信息是根据画面的显示内容进行划分设置的。
在步骤S102中，在获取每一所述RGB像素的灰阶值的步骤之前，需要先对各个图像分区进行归一化处理。例如可以采用gamma转化规则进行归一化处理对各个图像分区进行归一化处理。该步骤S102包括以下子步骤：
S1021、对所述RGB像素进行归一化处理，并获取归一化后的RGB像素的灰阶值。
S1022、将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度。
具体地，归一化处理前每一RGB像素灰阶值标记为Pic（H，L，a），其中，H和L分别是该子像素的横坐标和纵坐标，a用于标识该子像素的颜色，例如，当a=1时，该子像素为红色子像素，当a=2时，该子像素为绿色子像素，当a=3时，该子像素为蓝色子像素。通常取gamma=2.2, 归一化处理后的子像素的灰阶值记为In（H，L，a）= Pic（（H，L，a）/255）2.2。
在归一化处理后并获取到归一化处理后的子像素的灰阶值后，将各个子像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度。其主要甄别颜色为R(红)、G(绿)、B(蓝)、C(青)、M（紫红）、Y(黄色)。
在该步骤S103中，RGB像素的饱和度高于的判定为高纯度颜色像素，饱和度低于阈值的判定为非高纯度颜色像素。针对上述几种颜色对像素进行标定。阈值可以参考图像品味进行设定，在本实施例中，该阈值设定为0.8。
在该步骤S104中，对各个RGB像素预转换为RGBW像素，这里并非真正进行转换，只是为了获取进行转换时各个RGB像素的子像素对应的饱和度增益。RGBW像素包括红色子像素、绿色子像素、蓝色子像素以及白色子像素。
在该步骤S105中，将 R(红)、G(绿)、B(蓝)、C(青)、M（紫红）、Y(黄色)对应的视觉亮度增益系数分别设置为1.5、1.2、1.5、1.35、1.5以及1.1。对于高纯度颜色像素分别乘以R(红)、G(绿)、B(蓝)、C(青)、M（紫红）、Y(黄色)对应的视觉亮度增益系数，对于非高纯度颜色像素直接乘以1，以得到目标饱和度增益。
在该步骤S106中，需要先对各个RGB像素的目标饱和度增益情况进行统计。然后根据统计的情况，针对各个不同的图像分区，设置一个饱和度增益阈值gain_final，然后根据该饱和度阈值gain_final对该图像分区内的RGB像素的灰阶值进行优化。
具体地，优化时，当图像分区内的一RGB像素的目标饱和度增益大于对应的饱和度增益阈值时，将RGB像素的目标饱和度增益调整为对应的饱和度增益阈值。
在步骤S107中，根据优化处理后的目标饱和度增益将所述RGB像素转换为RGBW像素，并获取各个RGBW像素的子像素的灰阶值。对于一个RGBW像素而言，其灰阶值记录为（Rin，Gin，Bin，Win）。
在步骤S108中，该步骤包括以下子步骤：
S1081、根据每一图像分区内各个RGBW像素的灰阶值设定该图像分区内的背光亮度增益系数。其中，根据当前的图像分区内所有RGBW像素（R,G,B,W）值统计分布确定当前分区的背光亮度增益系数Blu_temp。具体地，可参考当前图像分区的RGBW像素的灰阶值的最大值或者平均值。以最大值为例，当前分区所有RGBW像素（R,G,B,W）灰阶值最大值为1时，设定背光亮度增益系数Blu_temp=1；当前分区所有RGBW像素灰阶值最大值为0时，设定背光亮度系数Blu_temp=0。
S1082、根据图像分区对应的饱和度增益阈值对该图像分区内的所述背光亮度增益系数进行修正，以得到目标背光亮度增益系数。目标背光亮度增益系数Blu=Blu_temp/gain_final，并将该背光增益系数输出给背光驱动单元以点亮相应图像分区的背光。
在该步骤S109中，根据转化后的RGBW像素的灰度值（Rin、Gin、Bin、Win），以及确定后的目标背光亮度增益系数Blu，计算灰阶补偿图像out (H,W,b)，其中，H为该子像素的横坐标，W为纵坐标，b用于标识子像素的种类。例如，当b=1时为红色子像素，当b=2时为绿色子像素，当b=3时为蓝色子像素，当b=4时为白色子像素。
在该步骤S110中，采用于gamma归一化相对应的de-gamma操作，将各个RGBW像素的out (H,W,b)还原为灰阶，并输出给图像控制器来控制图像的显示。
由上可知，由上可知，本发明通过将RGB显示转换RGBW显示，避免由于不同像素增益不一致导致的纯色偏暗问题，同时不同分区内的饱和度增益值可根据具体画面独立设置，能够最大限度提升W子像素的亮度增益效果提升穿透率。
请参照图2，图2是本发明一实施例中的适用RGBW显示的分区背光显示装置，包括：划分模块201、第一获取模块202、判断模块203、第二获取模块204、修正模块205、优化模块206、第三获取模块207、第四获取模块208、第五获取模块209以及显示模块210。
其中，该划分模块201用于根据背光分区设置信息将RGB图像划分成多个图像分区，每一所述图像分区包括多个RGB像素。
其中，该第一获取模块202，用于获取每一所述RGB像素的灰阶值，并将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度。第一获取模块包括：归一化单元，用于对所述RGB像素进行归一化处理，并获取归一化后的RGB像素的灰阶值；第二获取单元，用于将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度。
其中，该判断模块203用于根据所述饱和度判断每一所述RGB像素为高纯度颜色RGB像素或非高纯度颜色RGB像素，并生成判断结果。
其中，该第二获取模块204用于获取将各个所述RGB像素预转换为RGBW像素时，各个所述RGB像素对应的饱和度增益。
其中，该修正模块205用于根据所述判断结果以及每一所述RGB像素的视觉亮度增益系数对每一所述RGB像素的饱和度增益进行修正，以得到修正后的目标饱和度增益。修正模块205包括：第一获取单元，用于获取每一RGB像素的视觉亮度增益系数x；第二设置单元，用于当所述RGB像素为高纯度颜色RGB像素时，将该RGB像素的目标饱和度增益设置为mx；第三设置单元，用于当所述RGB像素为高纯度颜色RGB像素时，将所述目标饱和度增益设置为m；其中，m为该RGB像素的饱和度增益。
其中，该优化模块206用于对每一所述图像分区对应设置一饱和度增益阈值，并根据所述饱和度增益阈值对所述图像分区内的各个RGB像素的目标饱和度增益进行优化处理操作。优化模块206包括：第一设置单元，用于对每一所述图像分区对应设置一饱和度增益阈值；优化单元，用于当所述图像分区内的一RGB像素的目标饱和度增益大于对应的饱和度增益阈值时，将该RGB像素的目标饱和度增益调整为对应的所述饱和度增益阈值。
其中，该第三获取模块207用于根据优化处理后的目标饱和度增益将所述RGB像素转换为RGBW像素，并获取所述RGBW像素的灰阶值。
其中，该第四获取模块208用于根据每一所述图像分区内的各个所述RGBW像素的灰阶值以及所述图像分区对应的饱和度增益阈值获取目标背光亮度增益系数。
其中，第四获取模块208包括：设定单元，用于根据每一所述图像分区内各个所述RGBW像素的灰阶值设定该图像分区内的背光亮度增益系数；修正单元，用于根据所述图像分区对应的所述饱和度增益阈值对该图像分区内的所述背光亮度增益系数进行修正，以得到目标背光亮度增益系数。
其中，该第五获取模块209用于根据所述图像分区的目标背光亮度增益系数以及该图像分区内的RGBW像素的灰阶值，获取该图像分区的灰阶补偿画面。
其中，该显示模块210用于根据所述各个图像分区的灰阶补偿画面进行显示。
由上可知，本发明通过将RGB显示转换RGBW显示，避免由于不同像素增益不一致导致的纯色偏暗问题，同时不同分区内的饱和度增益值可根据具体画面独立设置，能够最大限度提升W子像素的亮度增益效果提升穿透率。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (11)

  1. 一种适用RGBW显示的分区背光显示方法，其中，包括以下步骤：
    根据背光分区设置信息将RGB图像划分成多个图像分区，每一所述图像分区包括多个RGB像素；
    获取每一所述RGB像素的灰阶值，并将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度；
    根据所述饱和度判断每一所述RGB像素为高纯度颜色RGB像素或非高纯度颜色RGB像素，并生成判断结果；
    获取将各个所述RGB像素预转换为RGBW像素时，各个所述RGB像素对应的饱和度增益；
    根据所述判断结果以及每一所述RGB像素的视觉亮度增益系数对每一所述RGB像素的饱和度增益进行修正，以得到修正后的目标饱和度增益；
    对每一所述图像分区对应设置一饱和度增益阈值，并根据所述饱和度增益阈值对所述图像分区内的各个RGB像素的目标饱和度增益进行优化处理操作；
    根据优化处理后的目标饱和度增益将所述RGB像素转换为RGBW像素，并获取所述RGBW像素的灰阶值；
    根据每一所述图像分区内的各个所述RGBW像素的灰阶值以及所述图像分区对应的饱和度增益阈值获取目标背光亮度增益系数；
    根据所述图像分区的目标背光亮度增益系数以及该图像分区内的RGBW像素的灰阶值，获取该图像分区的灰阶补偿画面；
    根据所述各个图像分区的灰阶补偿画面进行显示。
  2. 根据权利要求1所述的适用RGBW显示的分区背光显示方法，其中，所述根据每一所述图像分区内的各个所述RGBW像素的灰阶值以及所述图像分区对应的饱和度增益阈值获取目标背光亮度增益的步骤包括：
    根据每一所述图像分区内各个所述RGBW像素的灰阶值设定该图像分区内的背光亮度增益系数；
    根据所述图像分区对应的所述饱和度增益阈值对该图像分区内的所述背光亮度增益系数进行修正，以得到目标背光亮度增益系数。
  3. 根据权利要求2所述的适用RGBW显示的分区背光显示方法，其中，所述根据所述饱和度增益阈值对所述图像分区内的各个RGB像素的目标饱和度增益进行优化处理操作的步骤包括：
    当所述图像分区内的一RGB像素的目标饱和度增益大于对应的饱和度增益阈值时，将该RGB像素的目标饱和度增益调整为对应的所述饱和度增益阈值。
  4. 根据权利要求1所述的适用RGBW显示的分区背光显示方法，其中，所述根据所述判断结果以及每一RGB像素的视觉亮度增益系数对每一所述RGB像素的饱和度增益进行修正，以得到修正后的目标饱和度增益的步骤包括：
    获取每一RGB像素的视觉亮度增益系数x；
    当所述RGB像素为高纯度颜色RGB像素时，该RGB像素的目标饱和度增益有n=mx；
    当所述RGB像素为高纯度颜色RGB像素时，所述目标饱和度增益n=m；
    其中，m为该RGB像素的饱和度增益。
  5. 根据权利要求1所述的适用RGBW显示的分区背光显示方法，其中，所述获取每一所述RGB像素的灰阶值，并将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度的步骤包括：
    对所述RGB像素进行归一化处理，并获取归一化后的RGB像素的灰阶值；
    将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度。
  6. 一种适用RGBW显示的分区背光显示装置，其中，，包括：
    划分模块，用于根据背光分区设置信息将RGB图像划分成多个图像分区，每一所述图像分区包括多个RGB像素；
    第一获取模块，用于获取每一所述RGB像素的灰阶值，并将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度；
    判断模块，用于根据所述饱和度判断每一所述RGB像素为高纯度颜色RGB像素或非高纯度颜色RGB像素，并生成判断结果；
    第二获取模块，用于获取将各个所述RGB像素预转换为RGBW像素时，各个所述RGB像素对应的饱和度增益；
    修正模块，用于根据所述判断结果以及每一所述RGB像素的视觉亮度增益系数对每一所述RGB像素的饱和度增益进行修正，以得到修正后的目标饱和度增益；
    优化模块，用于对每一所述图像分区对应设置一饱和度增益阈值，并根据所述饱和度增益阈值对所述图像分区内的各个RGB像素的目标饱和度增益进行优化处理操作；
    第三获取模块，用于根据优化处理后的目标饱和度增益将所述RGB像素转换为RGBW像素，并获取所述RGBW像素的灰阶值；
    第四获取模块，用于根据每一所述图像分区内的各个所述RGBW像素的灰阶值以及所述图像分区对应的饱和度增益阈值获取目标背光亮度增益系数；
    第五获取模块，用于根据所述图像分区的目标背光亮度增益系数以及该图像分区内的RGBW像素的灰阶值，获取该图像分区的灰阶补偿画面；
    显示模块，用于根据所述各个图像分区的灰阶补偿画面进行显示。
  7. 根据权利要求6所述的适用RGBW显示的分区背光显示装置，其中，所述第四获取模块包括：
    设定单元，用于根据每一所述图像分区内各个所述RGBW像素的灰阶值设定该图像分区内的背光亮度增益系数；
    修正单元，用于根据所述图像分区对应的所述饱和度增益阈值对该图像分区内的所述背光亮度增益系数进行修正，以得到目标背光亮度增益系数。
  8. 根据权利要求7所述的适用RGBW显示的分区背光显示装置，其中，所述优化模块包括：
    第一设置单元，用于对每一所述图像分区对应设置一饱和度增益阈值；
    优化单元，用于当所述图像分区内的一RGB像素的目标饱和度增益大于对应的饱和度增益阈值时，将该RGB像素的目标饱和度增益调整为对应的所述饱和度增益阈值。
  9. 根据权利要求6所述的适用RGBW显示的分区背光显示装置，其中，所述修正模块包括：
    第一获取单元，用于获取每一RGB像素的视觉亮度增益系数x；
    第二设置单元，用于当所述RGB像素为高纯度颜色RGB像素时，将该RGB像素的目标饱和度增益设置为mx；
    第三设置单元，用于当所述RGB像素为高纯度颜色RGB像素时，将所述目标饱和度增益设置为m；
    其中，m为该RGB像素的饱和度增益。
  10. 根据权利要求6所述的适用RGBW显示的分区背光显示装置，其中，所述第一获取模块包括：
    归一化单元，用于对所述RGB像素进行归一化处理，并获取归一化后的RGB像素的灰阶值；
    第二获取单元，用于将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度。
  11. 一种适用RGBW显示的分区背光显示装置，其中，包括：划分模块，用于根据背光分区设置信息将RGB图像划分成多个图像分区，每一所述图像分区包括多个RGB像素；
    第一获取模块，用于获取每一所述RGB像素的灰阶值，并将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度；
    判断模块，用于根据所述饱和度判断每一所述RGB像素为高纯度颜色RGB像素或非高纯度颜色RGB像素，并生成判断结果；
    第二获取模块，用于获取将各个所述RGB像素预转换为RGBW像素时，各个所述RGB像素对应的饱和度增益；
    修正模块，用于根据所述判断结果以及每一所述RGB像素的视觉亮度增益系数对每一所述RGB像素的饱和度增益进行修正，以得到修正后的目标饱和度增益；
    优化模块，用于对每一所述图像分区对应设置一饱和度增益阈值，并根据所述饱和度增益阈值对所述图像分区内的各个RGB像素的目标饱和度增益进行优化处理操作；
    第三获取模块，用于根据优化处理后的目标饱和度增益将所述RGB像素转换为RGBW像素，并获取所述RGBW像素的灰阶值；
    第四获取模块，用于根据每一所述图像分区内的各个所述RGBW像素的灰阶值以及所述图像分区对应的饱和度增益阈值获取目标背光亮度增益系数；
    第五获取模块，用于根据所述图像分区的目标背光亮度增益系数以及该图像分区内的RGBW像素的灰阶值，获取该图像分区的灰阶补偿画面；
    显示模块，用于根据所述各个图像分区的灰阶补偿画面进行显示；
    所述第四获取模块包括：
    设定单元，用于根据每一所述图像分区内各个所述RGBW像素的灰阶值设定该图像分区内的背光亮度增益系数；
    修正单元，用于根据所述图像分区对应的所述饱和度增益阈值对该图像分区内的所述背光亮度增益系数进行修正，以得到目标背光亮度增益系数；
    所述优化模块包括：
    第一设置单元，用于对每一所述图像分区对应设置一饱和度增益阈值；
    优化单元，用于当所述图像分区内的一RGB像素的目标饱和度增益大于对应的饱和度增益阈值时，将该RGB像素的目标饱和度增益调整为对应的所述饱和度增益阈值；
    所述修正模块包括：
    第一获取单元，用于获取每一RGB像素的视觉亮度增益系数x；
    第二设置单元，用于当所述RGB像素为高纯度颜色RGB像素时，将该RGB像素的目标饱和度增益设置为mx；
    第三设置单元，用于当所述RGB像素为高纯度颜色RGB像素时，将所述目标饱和度增益设置为m；
    其中，m为该RGB像素的饱和度增益；
    所述第一获取模块包括：
    归一化单元，用于对所述RGB像素进行归一化处理，并获取归一化后的RGB像素的灰阶值；
    第二获取单元，用于将所述RGB像素的灰阶值转换到HSV空间，以获取所述RGB像素的饱和度。
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