WO2019085112A1 - Oled显示面板的灰阶补偿表的压缩方法 - Google Patents

Oled显示面板的灰阶补偿表的压缩方法 Download PDF

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WO2019085112A1
WO2019085112A1 PCT/CN2017/113685 CN2017113685W WO2019085112A1 WO 2019085112 A1 WO2019085112 A1 WO 2019085112A1 CN 2017113685 W CN2017113685 W CN 2017113685W WO 2019085112 A1 WO2019085112 A1 WO 2019085112A1
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compensation
compensation table
gray scale
quality
tables
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PCT/CN2017/113685
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English (en)
French (fr)
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邓宇帆
周明忠
许神贤
王荣刚
范逵
李好
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深圳市华星光电半导体显示技术有限公司
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Priority to JP2020519121A priority Critical patent/JP6913827B2/ja
Priority to KR1020207015708A priority patent/KR102316176B1/ko
Priority to EP17930677.4A priority patent/EP3706106A4/en
Priority to US15/744,809 priority patent/US10666292B2/en
Publication of WO2019085112A1 publication Critical patent/WO2019085112A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • 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]
    • G09G3/3225—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] using an active matrix
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/02—Handling of images in compressed format, e.g. JPEG, MPEG

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a method for compressing a gray scale compensation table of an OLED display panel.
  • the organic light emitting diode (OLED) display device has self-luminous, low driving voltage, high luminous efficiency, short response time, high definition and contrast, near 180° viewing angle, wide temperature range, and flexible display and large-area full-color display. And many other advantages, recognized by the industry as the most promising display device.
  • the OLED display device can be classified into two types: passive matrix OLED (PMOLED) and active matrix OLED (AMOLED) according to the driving method.
  • PMOLED passive matrix OLED
  • AMOLED active matrix OLED
  • the AMOLED has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used as a high-definition large-sized display device.
  • the prior art generally uses a compensation table to store compensation information of each pixel in the OLED display panel.
  • the driver board looks up the compensation table, adjusts the signal, raises the signal in the dark area of the panel, and lowers the signal in the over-bright area to present a uniform display effect.
  • each pixel corresponds to a set of compensation information, and each set of compensation information includes one or more compensation data.
  • the compensation data is an adjustment value of a specific gray scale.
  • the size of the compensation table is generally equal to the number of pixels multiplied by the size of each set of compensation information, and the compensation table occupies a large amount of system storage space.
  • An OLED display panel corresponds to a plurality of compensation tables of different color channels and different gray levels.
  • the compensation table needs to be compressed and stored first.
  • the compensation data stored in the compensation table is an adjustment value of a specific gray scale
  • each gray scale compensation table actually corresponds to one image, and the compression of the gray scale compensation table is actually equal to Compress the image.
  • each grayscale compensation table will affect the compensation of a certain color channel and a certain grayscale. effect. If there is insufficient quality of a compensation table in a set of gray scale compensation tables of the display panel, the quality of the panel will be affected.
  • the existing encoder can support the encoding of 4:0:0, 4:2:2 and 4:4:4 color space, and the existing encoder can be used to encode the image, that is, the gray scale compensation table can realize the compressed gray scale compensation table. the goal of.
  • the configuration used in the prior art for encoding the grayscale compensation table is All Intra, that is, intra coding is performed for each compensation table.
  • each compensation table is independent, and there is no correlation between the compensation table and the compensation table.
  • only the intra prediction module is used to reduce intraframe redundancy. Redundancy between different compensation tables is not considered.
  • the quantization coefficient (QP) when the quantization coefficient (QP) is set, only the compression effect of the compensation table is targeted, and the optimization of the overall target is not considered. In fact, the quality of the display panel is guaranteed only when all the picture quality of a set of compensation tables is up to standard.
  • the disadvantage of the compression method of the gray scale compensation table of the existing OLED display panel is that the redundancy between images is not considered when compressing each image; when the quantization coefficient (QP) is set, the The overall optimal performance of a compressed multiple compensation table.
  • the object of the present invention is to provide a compression method for a gray scale compensation table of an OLED display panel.
  • the redundancy between the same color channel and different gray scale images is eliminated as much as possible, and the compression compensation table is improved. Efficiency and performance.
  • the present invention provides a method for compressing a gray scale compensation table of an OLED display panel, including:
  • Step 10 When transmitting a set of gray scale compensation tables of the OLED panel to the encoder for encoding, first, different gray scale compensation tables having the same color channel and different gray levels in the gray scale compensation table are differentiated. Computing to obtain a corresponding reference image and a difference image as a substitute for the plurality of grayscale compensation tables;
  • Step 20 transmitting the corresponding reference image and the difference image to the encoder as a substitute for the multiple grayscale compensation table
  • Step 30 The encoder performs coding compression on the received grayscale compensation table.
  • step 30 when the encoder performs coding compression, the quantization coefficients of each compensation table are adaptively adjusted: under the premise of satisfying the overall compression ratio, the quality of each compensation table before and after the coding is expected to be expected, or each compensation The quality of the table is close.
  • step 10 for the N gray scale compensation tables having the same color channel and different gray levels, one gray scale compensation table is taken as the reference image, and the other N-1 gray scale compensation tables are differentially operated.
  • N gray scale compensation for the same color channel and different gray levels Table divide it into M group, M ⁇ N/2, each set of N/M gray scale compensation table, for each set of gray scale compensation table, do the following processing: take one gray scale compensation table as the reference image, Other N/M-1 grayscale compensation tables perform differential operations.
  • step 10 for the N gray scale compensation tables having the same color channel and different gray levels, one gray scale compensation table is taken as the reference image, and the other N-1 gray scale compensation tables are differentially operated to obtain N- One difference image; in the N-1 difference image, another difference image is taken as a reference, and the remaining N-2 sheets are subjected to differential operation again.
  • the method further includes: obtaining the corresponding reference image and the difference image during decoding, and adding the corresponding reference image and the difference image to each other to obtain a gray scale compensation table after decompression.
  • Step 30 includes:
  • the coding quality after sorting is evaluated as V1, V2, V3...VN (V1 ⁇ V2 ⁇ ... ⁇ VN), and the corresponding compensation table is G1, G2...GN;
  • V1 ⁇ V2 ⁇ ... ⁇ VN the coding quality after sorting
  • the N compensation tables are divided into three categories; if V i ⁇ V N/2 -value1, the picture is placed into the class ⁇ ; V N/2 -value1 ⁇ V i ⁇ V N/2 +value1, the picture is placed into the class ⁇ ; if V i >V N/2 +value1 , the picture is placed into the class ⁇ ; the compensation in the class ⁇
  • the table coding quality is the best; the compensation quality of the compensation table in the class ⁇ is medium; the compensation quality of the compensation table in the class ⁇ is the worst;
  • Steps b) to c) are repeated until the condition A or B is satisfied, and the code is exited.
  • the image quality is measured by a peak signal to noise ratio.
  • the quantized coefficient is initialized to 10.
  • the invention also provides a compression method for a gray scale compensation table of an OLED display panel, comprising:
  • Step 10 When transmitting a set of gray scale compensation tables of the OLED panel to the encoder for encoding, first, different gray scale compensation tables having the same color channel and different gray levels in the gray scale compensation table are differentiated. Computing to obtain a corresponding reference image and a difference image as a substitute for the plurality of grayscale compensation tables;
  • Step 20 transmitting the corresponding reference image and the difference image to the encoder as a substitute for the multiple grayscale compensation table
  • Step 30 The encoder encodes and compresses the received grayscale compensation table.
  • step 30 when the encoder performs coding compression, the quantization coefficients of each compensation table are adaptively adjusted: under the premise of satisfying the overall compression ratio, the quality of each compensation table before and after the coding is expected to be expected, or each compensation The quality of the table is close;
  • the method further includes: obtaining the corresponding reference image and the difference image when decoding, adding the corresponding reference image and the difference image to each other to decompress the gray scale compensation table;
  • Step 30 includes:
  • the coding quality after sorting is evaluated as V1, V2, V3...VN (V1 ⁇ V2 ⁇ ... ⁇ VN), and the corresponding compensation table is G1, G2...GN;
  • V1 ⁇ V2 ⁇ ... ⁇ VN the coding quality after sorting
  • the N compensation tables are divided into three categories; if V i ⁇ V N/2 -value1, the picture is placed into the class ⁇ ; V N/2 -value1 ⁇ V i ⁇ V N/2 +value1, the picture is placed into the class ⁇ ; if V i >V N/2 +value1 , the picture is placed into the class ⁇ ; the compensation in the class ⁇
  • the table coding quality is the best; the compensation quality of the compensation table in the class ⁇ is medium; the compensation quality of the compensation table in the class ⁇ is the worst;
  • the image quality is measured by a peak signal to noise ratio.
  • the compression method of the gray scale compensation table of the OLED display panel of the present invention performs frame level difference between the same color component and different gray scale compensation tables in the same group of OLED compensation tables, thereby improving the efficiency and performance of the compression compensation table. ; adaptively adjust the quantization coefficient of each compensation table, under the premise of satisfying the overall compression ratio, the quality of each compensation table before and after the coding is expected, or the quality of each compensation table is close.
  • FIG. 1 is a flow chart of a method for compressing a gray scale compensation table of an OLED display panel of the present invention
  • FIG. 2 is a flow chart of an overall algorithm of a preferred embodiment of a method for compressing a gray scale compensation table of an OLED display panel according to the present invention
  • FIG. 3 is a schematic diagram of a process of differentially encoding a compensation table according to a preferred embodiment of a method for compressing a gray scale compensation table of an OLED display panel of the present invention
  • 4a, 4b and 4c are schematic diagrams of gray scale compensation tables oled_2_024, oled_2_064 and their difference images, respectively.
  • FIG. 1 is a flowchart of a method for compressing a gray scale compensation table of an OLED display panel according to the present invention
  • the present invention mainly includes:
  • Step 10 When transmitting a set of gray scale compensation tables of the OLED panel to the encoder for encoding, first, different gray scale compensation tables having the same color channel and different gray levels in the gray scale compensation table are differentiated. Computing to obtain a corresponding reference image and a difference image as the plurality of grayscale patches Substitute for reimbursement;
  • Step 20 transmitting the corresponding reference image and the difference image to the encoder as a substitute for the multiple grayscale compensation table
  • Step 30 The encoder performs coding compression on the received grayscale compensation table.
  • FIG. 2 is a flowchart of an overall algorithm of a compression method of a gray scale compensation table of an OLED display panel according to the present invention
  • FIG. 3 is a schematic diagram of a process of differentially encoding a compensation table according to the preferred embodiment.
  • the invention eliminates redundancy between the same color channel and different gray-scale images as much as possible, and improves the efficiency and performance of the compression compensation table.
  • the quantization coefficient of each compensation table is adaptively adjusted at the encoding end, and the overall compression ratio is up to standard, and the overall image quality is optimized.
  • One OLED panel corresponds to multiple compensation tables.
  • the difference operation is first performed, then the reference quantity and the difference quantity are transmitted to the coding module, and the quantization coefficient is iteratively adjusted until the overall compression rate reaches the preset condition, and the images of the compensation tables are obtained.
  • the quality is up to standard, or the difference in image quality between the compensation tables is less than the threshold.
  • one of them is taken as a reference, and the other N-1 sheets are subjected to a differential operation. Then, one reference image and N-1 differential images are separately encoded. After decoding by the decoding end, the difference image and the reference image are restored and added to each other to obtain a decoded image.
  • these compensation tables are divided into M (M ⁇ N / 2) groups, each set of N / M sheet compensation table. The encoding end does this for each set of compensation tables: taking one picture as the reference and N/M-1 for the differential operation. After decoding at the decoding end, the difference image is restored and added to the corresponding reference image to obtain a decoded image.
  • N-1 differential images are encoded separately.
  • N-2 differential images are restored first, and then N-1 differential images are restored to obtain a decoded image.
  • the quantization coefficient is adaptively adjusted.
  • the decompressed compensation table needs to satisfy condition A or condition B: all image quality is greater than Vg, and the condition is denoted as A; in all images, the difference between the best quality and the lowest quality is less than Vt, and the condition is denoted as B.
  • the N compensation tables are divided into three categories. If V i ⁇ V N/2 -value1, the picture is placed into the class ⁇ ; if V N/2 -value1 ⁇ V i ⁇ V N/2 +value1, the picture is placed into the class ⁇ ; if V i >V N/2 +value1, the picture is placed in class ⁇ .
  • the compensation quality of the compensation table in class ⁇ is the best; the coding quality of the compensation table in class ⁇ is medium; the compensation quality of the compensation table in class ⁇ is the worst.
  • the average values of gray1 and gray2 are calculated, and are respectively referred to as mean(gray1) and mean(gray2).
  • mean(gray1) and mean(gray2) For each pixel value of gray1, perform differential operation according to formula (1) (set the resolution of the compensation table to width ⁇ height (width ⁇ height), width>i ⁇ 0, height>j ⁇ 0).
  • Gray1(i,j) gray2(i,j)+mean(gray1)-mean(gray2)-gray1(i,j)(1)
  • gray1 is adjusted according to formula (2) to ensure that each pixel value in the gray1 image is not less than zero.
  • the difference image gray1' of gray1 is obtained (the process of obtaining gray2' is similar).
  • Gray1(i,j)' gray2(i,j)-gray1(i,j)+diff_va (3)
  • code gray2, gray1', and gray3' are respectively encoded.
  • the encoding encodes a parameter diff_val for each of gray1' and gray3' images.
  • the decoding end reads the diff_val from the code stream, and decodes the compressed image gray2, gray1', and gray3'.
  • the difference image is restored according to formula (4).
  • Gray1(i,j) gray2(i,j)-gray1(i,j)'+diff_va (4)
  • 4a, 4b, and 4c are gray-scale compensation tables oled_2_024, oled_2_064, and their difference images, respectively, and the difference between the compensation tables is performed to remove high-frequency components.
  • the difference image of oled_2_024 has been much reduced compared to its original image, so the compression gain is naturally much improved when it is compressed.
  • the test sequence is 4 sets of OLED panels oled3, oled6, oled9 and oled12 (the number is used to distinguish the OLED panel size specifications), and the 4 sets of OLED compensation tables are composed of 4 chrominance components (R, G, B, W) and 3 kinds of ash.
  • the order composition, each chroma component corresponds to 3 gray scales, a total of 12 compensation table images.
  • the resolution of oled3 is 1920 ⁇ 2160
  • the resolution of oled6, oled9, and oled12 is 1080 ⁇ 1920.
  • Table 1 The compression performance results are shown in Table 1.
  • the N compensation tables are divided into three categories. If V i ⁇ V N/2 -2, the picture is placed into the class ⁇ ; if V N/2 -2 ⁇ V i ⁇ V N/2 + 2, the picture is placed into the class ⁇ ; if V i >V N/2 +2, the picture is placed in class ⁇ .
  • the compensation quality of the compensation table in class ⁇ is the best; the coding quality of the compensation table in class ⁇ is medium; the compensation quality of the compensation table in class ⁇ is the worst.
  • the PSNR of the compensation table in class ⁇ is >54; the PSNR of the compensation table in class ⁇ is ⁇ 50; and the compensation table of class ⁇ is 50 ⁇ PSNR ⁇ 54.
  • increase The quantization coefficient of the compensation table in the class ⁇ reduces the quantization coefficient of the compensation table in the class ⁇ , and the quantization coefficient of the compensation table in the class ⁇ remains unchanged.
  • the compression method of the gray scale compensation table of the OLED display panel of the present invention performs frame level difference between the same color component and different gray scale compensation tables in the same group of OLED compensation tables, thereby improving the efficiency and performance of the compression compensation table. ; adaptively adjust the quantization coefficient of each compensation table, under the premise of satisfying the overall compression ratio, the quality of each compensation table before and after the coding is expected, or the quality of each compensation table is close.

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Abstract

一种OLED显示面板的灰阶补偿表的压缩方法。OLED显示面板的灰阶补偿表的压缩方法包括：步骤10、在将OLED面板所具有的一组灰阶补偿表传输至编码器以编码时，首先对一组灰阶补偿表中具有相同色彩通道、不同灰阶的多张灰阶补偿表进行差分运算以得到相应的基准图像和差分图像作为多张灰阶补偿表的替代者；步骤20、将相应的基准图像和差分图像作为多张灰阶补偿表的替代者传输至编码器；步骤30、编码器对接收的灰阶补偿表进行编码压缩。OLED显示面板的灰阶补偿表的压缩方法在同一组OLED补偿表中，相同色彩分量、不同灰阶补偿表之间，进行帧级差分，提高压缩补偿表的效率和性能。

Description

OLED显示面板的灰阶补偿表的压缩方法 技术领域
本发明涉及显示技术领域，尤其涉及一种OLED显示面板的灰阶补偿表的压缩方法。
背景技术
有机发光二极管(OLED)显示装置具有自发光、驱动电压低、发光效率高、响应时间短、清晰度与对比度高、近180°视角、使用温度范围宽，可实现柔性显示与大面积全色显示等诸多优点，被业界公认为是最有发展潜力的显示装置。OLED显示装置按照驱动方式可以分为无源矩阵型OLED(Passive Matrix OLED，PMOLED)和有源矩阵型OLED(Active Matrix OLED，AMOLED)两大类。其中，AMOLED具有呈阵列式排布的像素，属于主动显示类型，发光效能高，通常用作高清晰度的大尺寸显示装置。
目前在平面显示面板生产过程中由于生产工艺等原因经常会产生亮度不均匀(Mura)等缺陷，出现亮点或暗点，导致面板的显示品质降低。为了消除OLED显示面板的亮度不均匀等缺陷，现有技术通常采用补偿表来存储OLED显示面板中各像素的补偿信息。放映影像时，驱动板查找补偿表，调整信号，将面板过暗区域的信号调高，过亮区域的信号调低，呈现均匀的显示效果。
在补偿表中，每个像素对应于一组补偿信息，每组补偿信息包含一个或多个补偿数据，对于灰阶补偿表，补偿数据为特定灰阶的调整值。在现有技术中，补偿表的大小一般等于像素数目乘以每组补偿信息的大小，补偿表占用大量系统存储空间。
一块OLED显示面板对应于多张不同色彩通道、不同灰阶的补偿表。为了节省成本，以及减少数据传输时间，需要将补偿表先压缩再存储。对于灰阶补偿表来说，由于补偿表中存储的补偿数据为特定灰阶的调整值，因此每张灰阶补偿表实际上都对应一张图像，并且对灰阶补偿表的压缩实际上等于对图像进行压缩。
不同灰阶补偿表即图像之间存在着大量冗余。对于相同色彩通道、不同灰阶的图像之间的冗余尤为显著，其图像间的纹理很相似。如果能有方法去除不同灰阶图像间的冗余，就能大大提高灰阶补偿表的压缩效率。
另一方面，每张灰阶补偿表都会影响某种色彩通道、某段灰阶的补偿 效果。如果显示面板的一组灰阶补偿表中有某张补偿表的质量不足，将会影响面板的质量。
现有的编码器能够支持4:0:0，4:2:2和4:4:4颜色空间的编码，利用现有编码器来编码图像即灰阶补偿表即可以实现压缩灰阶补偿表的目的。但是，现有技术中编码灰阶补偿表时使用的配置是全帧内(All Intra)，即对每张补偿表进行帧内编码。在对灰阶补偿表进行编码时，每张补偿表独立，补偿表与补偿表之间没有关联。在编码时，仅有帧内预测模块来减少帧内冗余。并没有考虑不同补偿表之间的冗余。而且设置量化系数(QP)时，仅以补偿表的压缩效果作为目标，没有考虑到整体目标的最优化。而实际上只有一组补偿表的所有图片质量全都达标时，显示面板的质量才有保证。总之，现有的OLED显示面板的灰阶补偿表的压缩方法的缺点在于：对每张图像进行压缩时，并未考虑图像之间的冗余；设置量化系数(QP)时，没有考虑到所压缩的多张补偿表的整体最优性能。
发明内容
因此，本发明的目的在于提供一种OLED显示面板的灰阶补偿表的压缩方法，在同一组OLED补偿表中，尽可能消除相同色彩通道、不同灰阶图像间的冗余，提高压缩补偿表的效率和性能。
为实现上述目的，本发明提供了一种OLED显示面板的灰阶补偿表的压缩方法，包括：
步骤10、在将OLED面板所具有的一组灰阶补偿表传输至编码器以编码时，首先对该组灰阶补偿表中具有相同色彩通道、不同灰阶的多张灰阶补偿表进行差分运算以得到相应的基准图像和差分图像作为该多张灰阶补偿表的替代者；
步骤20、将该相应的基准图像和差分图像作为该多张灰阶补偿表的替代者传输至编码器；
步骤30、编码器对接收的灰阶补偿表进行编码压缩。
其中，步骤30中，编码器进行编码压缩时，自适应调整各张补偿表的量化系数：在满足整体压缩率的前提下，使编码前后各张补偿表的质量均达到预期，或各张补偿表的质量接近。
其中，步骤10中，对于具有相同色彩通道、不同灰阶的N张灰阶补偿表，取其中一张灰阶补偿表作为基准图像，其他N－1张灰阶补偿表进行差分操作。
其中，步骤10中，对于具有相同色彩通道、不同灰阶的N张灰阶补偿 表，将其分为M组，M≤N/2，每组N/M张灰阶补偿表，对每组灰阶补偿表都做如下处理：取其中一张灰阶补偿表作为基准图像，其他N/M－1张灰阶补偿表进行差分操作。
其中，步骤10中，对于具有相同色彩通道、不同灰阶的N张灰阶补偿表，取其中一张灰阶补偿表作为基准图像，其他N－1张灰阶补偿表进行差分操作得到N－1张差分图像；在N－1张差分图像中，再取一张差分图像作为基准，剩下的N－2张再次进行差分操作。
其中，还包括：解码时得到该相应的基准图像和差分图像，将该相应的基准图像和差分图像彼此相加得解压后的灰阶补偿表。
其中，设解压后的灰阶补偿表需要满足条件A或者条件B：所有图像质量大于Vg，该条件记为A；所有图像中，最佳质量与最次质量之差小于Vt，该条件记为B；步骤30包括：
a)量化系数初始化；
b)压缩编码，若实际压缩率>预设压缩率，则增大量化系数；否则减小量化系数。按照这一准则重复编码，直至量化系数＝Qpbase时满足实际压缩率≤预设压缩率；且量化系数＝Qpbase-1时，实际压缩率>预设压缩率，停止循环；若所有补偿表解压后都满足条件A或B，则退出编码；
c)否则，设置阈值value1:
I.根据编码质量从小到大进行排序，设排序后的编码质量评价为V1、V2、V3…VN(V1<V2<…<VN)，对应的补偿表为G1、G2…GN；假定在此编码质量评估方法中，V值越小，质量越高；
II.以编码质量中等的那张补偿表GN/2为基准，共将N张补偿表分为三类；若Vi<VN/2-value1，则将图片放置到类α中；若VN/2-value1≤Vi≤VN/2+value1，则将图片放置到类β中；若Vi>VN/2+value1，则将图片放置到类γ中；类α中补偿表编码质量最好；类β中补偿表编码质量中等；类γ中补偿表编码质量最差；
III.减少类γ中补偿表的量化系数，增大类α中补偿表的量化系数，类β中补偿表的量化系数保持不变，进行重新 编码；
重复步骤b)～c)，直至满足条件A或B时，退出编码。
其中，所述图像质量以峰值信噪比来衡量。
其中，所述量化系数初始化为10。
本发明还提供一种OLED显示面板的灰阶补偿表的压缩方法，包括：
步骤10、在将OLED面板所具有的一组灰阶补偿表传输至编码器以编码时，首先对该组灰阶补偿表中具有相同色彩通道、不同灰阶的多张灰阶补偿表进行差分运算以得到相应的基准图像和差分图像作为该多张灰阶补偿表的替代者；
步骤20、将该相应的基准图像和差分图像作为该多张灰阶补偿表的替代者传输至编码器；
步骤30、编码器对接收的灰阶补偿表进行编码压缩；
其中，步骤30中，编码器进行编码压缩时，自适应调整各张补偿表的量化系数：在满足整体压缩率的前提下，使编码前后各张补偿表的质量均达到预期，或各张补偿表的质量接近；
还包括：解码时得到该相应的基准图像和差分图像，将该相应的基准图像和差分图像彼此相加得解压后的灰阶补偿表；
其中，设解压后的灰阶补偿表需要满足条件A或者条件B：所有图像质量大于Vg，该条件记为A；所有图像中，最佳质量与最次质量之差小于Vt，该条件记为B；步骤30包括：
a)量化系数初始化；
b)压缩编码，若实际压缩率>预设压缩率，则增大量化系数；否则减小量化系数。按照这一准则重复编码，直至量化系数＝Qpbase时满足实际压缩率≤预设压缩率；且量化系数＝Qpbase-1时，实际压缩率>预设压缩率，停止循环；若所有补偿表解压后都满足条件A或B，则退出编码；
c)否则，设置阈值value1:
I.根据编码质量从小到大进行排序，设排序后的编码质量评价为V1、V2、V3…VN(V1<V2<…<VN)，对应的补偿表为G1、G2…GN；假定在此编码质量评估方法中，V值越小，质量越高；
II.以编码质量中等的那张补偿表GN/2为基准，共将N张补偿表分为三类；若Vi<VN/2-value1，则将图片放置到类α中；若VN/2-value1≤Vi≤VN/2+value1，则将图片放置到类β中；若Vi>VN/2+value1，则将图片放置到类γ中；类α中补偿表编码质量最好；类β中补偿表编码质量中等；类γ中补偿表编码质量最差；
III.减少类γ中补偿表的量化系数，增大类α中补偿表的量化系数，类β中补偿表的量化系数保持不变，进行重新编码；
重复步骤b)～c)，直至满足条件A或B时，退出编码；
其中，所述图像质量以峰值信噪比来衡量。
综上，本发明的OLED显示面板的灰阶补偿表的压缩方法在同一组OLED补偿表中，相同色彩分量、不同灰阶补偿表之间，进行帧级差分，提高压缩补偿表的效率和性能；自适应调整各张补偿表的量化系数，在满足整体压缩率的前提下，编码前后各张补偿表的质量均达到预期，或各张补偿表的质量接近。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其他有益效果显而易见。
附图中，
图1为本发明OLED显示面板的灰阶补偿表的压缩方法的流程图；
图2为本发明OLED显示面板的灰阶补偿表的压缩方法一较佳实施例的整体算法流程图；
图3为本发明OLED显示面板的灰阶补偿表的压缩方法一较佳实施例对补偿表进行差分编码的过程示意图；
图4a，4b及4c分别是灰阶补偿表oled_2_024、oled_2_064和二者差分图像示意图。
具体实施方式
参见图1，其为本发明OLED显示面板的灰阶补偿表的压缩方法的流程图，本发明主要包括：
步骤10、在将OLED面板所具有的一组灰阶补偿表传输至编码器以编码时，首先对该组灰阶补偿表中具有相同色彩通道、不同灰阶的多张灰阶补偿表进行差分运算以得到相应的基准图像和差分图像作为该多张灰阶补 偿表的替代者；
步骤20、将该相应的基准图像和差分图像作为该多张灰阶补偿表的替代者传输至编码器；
步骤30、编码器对接收的灰阶补偿表进行编码压缩。
参见图2，其为本发明OLED显示面板的灰阶补偿表的压缩方法一较佳实施例的整体算法流程图；图3为该较佳实施例对补偿表进行差分编码的过程示意图。
本发明在同一组OLED补偿表中，尽可能消除相同色彩通道、不同灰阶图像间的冗余，提高压缩补偿表的效率和性能。在编码端自适应地调整每张补偿表的量化系数，整体压缩率达标，同时整体的图像质量最优化。
一个OLED面板对应于多张补偿表。对于相同色彩通道、不同灰阶的N幅图像，首先做差分运算，然后将基准量、差分量传输至编码模块，迭代调整量化系数，直至整体压缩率达到预设条件，且各补偿表的图像质量均达到标准，或各补偿表的图像质量之差小于阈值。
取一组OLED补偿表中相同色彩通道、不同灰阶的N幅图像，分别记为gray1、gray2、gray3…grayN，做差分运算：
可选地，在编码端，取其中一张作为基准，其他N-1张进行差分操作。然后分别编码1张基准图像和N-1张差分图像。解码端解码后，恢复差分图像及基准图像，彼此相加得到解码图像。
可选地，把这些补偿表分为M(M≤N/2)组，每组N/M张补偿表。编码端对每组补偿表都做这样的处理：取1张图片做基准，N/M-1张进行差分操作。在解码端解码后，恢复差分图像，与相应的基准图像相加，得到解码图像。
可选地，在编码端，取其中一张作为基准，其他N-1张进行差分操作；在N-1差分图像中，再取一张作为基准，剩下的N-2张再次进行差分操作。然后分别编码1张基准图像、1张差分1次的图片、N-2张差分2次的图像。解码端解码后，先恢复N-2张差分图像，再恢复N-1张差分图片，得到解码图像。
N幅补偿表编码时，自适应调节量化系数。首先设解压后的补偿表需要满足条件A或者条件B：所有图像质量大于Vg，该条件记为A；所有图像中，最佳质量与最次质量之差小于Vt，该条件记为B。
a)量化系数初始化；
b)压缩编码，若实际压缩率>预设压缩率，则增大量 化系数；否则减小量化系数。按照这一准则重复编码，直至量化系数＝Qpbase时实际压缩率≤预设压缩率；且量化系数＝Qpbase-1时，实际压缩率>预设压缩率，停止循环。若所有补偿表解压后都满足条件A或B，则退出编码。
c)否则，设置阈值value1:
I.根据编码质量从小到大进行排序，设排序后的编码质量评价为V1、V2、V3…VN(V1<V2<…<VN)，对应的补偿表为G1、G2…GN。假定在此编码质量评估方法中，V值越小，质量越高。
II.以编码质量中等的那张补偿表GN/2为基准，共将N张补偿表分为三类。若Vi<VN/2-value1，则将图片放置到类α中；若VN/2-value1≤Vi≤VN/2+value1，则将图片放置到类β中；若Vi>VN/2+value1，则将图片放置到类γ中。类α中补偿表编码质量最好；类β中补偿表编码质量中等；类γ中补偿表编码质量最差。
III.减少类γ中补偿表的量化系数，增大类α中补偿表的量化系数，类β中补偿表的量化系数保持不变，进行重新编码。
重复步骤②-③，直至满足条件A或B时，退出编码。此时能够保证N张补偿表的整体压缩性能最优。
1)下面举例说明帧级差分算法具体计算步骤(以三张补偿表为例)：
①以图像gray1为例，描述得到差分图像gray1′的过程：
首先计算gray1、gray2的平均值，分别记为mean(gray1)、mean(gray2)。对gray1每一个像素值，根据公式(1)进行差分操作(设补偿表的分辨率是width×height(宽度×高度)，width>i≥0，height>j≥0)。
gray1(i,j)＝gray2(i,j)+mean(gray1)-mean(gray2)-gray1(i,j)(1)
取gray1最小值，记为gray_min。此时，gray1图像中的像素值，有正值，也有负值。所以对gray1根据公式(2)进行调整，保证gray1图像中每个像素值不小于0。
gray1(i,j)′＝gray1(i,j)-gray_min               (2)
处理完gray1所有像素值后，就得到了gray1的差分图像gray1′(得到gray2′的过程与之类似)。
对于gray1，记diff_val＝mean(gray1)-mean(gray2)-gray_min，公式(1)和公式(2)等价于公式(3)。
gray1(i,j)′＝gray2(i,j)-gray1(i,j)+diff_va              (3)
②按照HEVC的编码流程，分别编码gray2、gray1′、gray3′。编码对gray1′、gray3′两幅图像分别编码一个参数diff_val。
③解码端从码流中读出diff_val，并解码得到压缩后的图像gray2、gray1′、gray3′。根据公式(4)恢复差分图像。
gray1(i,j)＝gray2(i,j)-gray1(i,j)′+diff_va             (4)
④调整图像的输出顺序，最终得到解压后的补偿表图像gray1、gray2、gray3。
图4a，4b及4c分别是灰阶补偿表oled_2_024、oled_2_064和二者差分图像，在补偿表间做差分，去除高频分量。观察可知，oled_2_024的差分图像相比于其原图像，信息已经减少了许多，因此对其进行压缩时，编码增益自然也会提高许多。
下面通过具体测试验证本发明补偿表间差分的压缩性能。
测试序列为4组OLED面板oled3、oled6、oled9及oled12(数字用于区分OLED面板尺寸规格)，4组OLED补偿表均由4种色度分量(R、G、B、W)和3种灰阶组成，每种色度分量对应3种灰阶，共12幅补偿表图像。其中oled3的分辨率是1920×2160，oled6、oled9、oled12的分辨率是1080×1920。压缩性能结果如表1所示。
表1 补偿表压缩性能结果
序列 BD-rate
oled3 -15.3％
oled6 -9.6％
oled9 -20.0％
oled12 -12.1％
平均 -14.2％
由表1可知，按照本发明的方法对4组OLED补偿表使用灰阶差分编码时，其BD-rate(相同质量下的码率)平均减少了14.2％，其编码增益相当可观。
2)下面具体举例说明本发明自适应调整补偿表QP，步骤简述如下：
对N张补偿表图像进行编码时，自适应调节量化系数。假设压缩后的每张图像都满足PSNR≥50，该条件记为A；假设压缩后图像间ΔPSNR≤2(ΔPSNR为不同图相间PSNR的差值)，该条件记为B；假设预设压缩率＝35％，将图片压缩到原来大小的35％。
①假设初始量化系数＝10；
②压缩编码，若实际压缩率>35％，增大量化系数。重复编码，直至量化系数＝Qpbase时满足实际压缩率≤35％，停止循环。若所有补偿表压缩后都满足条件A，则退出编码。
③否则(设置一个合适的阈值value1，假设value1＝2):
i.按照编码质量将图片从小到大进行排序(第一张补偿表的编码质量最好，最后一张补偿表的编码质量最差)，设排序后的编码质量评价为V1、V2、V3…VN，对应的补偿表为G1、G2…GN。
ii.以编码质量中等的那张补偿表GN/2为基准，共将N张补偿表分为三类。若Vi<VN/2-2，则将图片放置到类α中；若VN/2-2≤Vi≤VN/2+2，则将图片放置到类β中；若Vi>VN/2+2，则将图片放置到类γ中。类α中补偿表编码质量最好；类β中补偿表编码质量中等；类γ中补偿表编码质量最差。
iii.减少类γ中补偿表的量化系数，因为其质量最差；增大类α中补偿表的量化系数，因为其质量最好；类β中补偿表的量化系数保持不变，进行重新编码。
假如此时：类α中补偿表的PSNR>54；类γ中补偿表的PSNR<50；类β中补偿表的50≤PSNR≤54。会采取这样的策略调整量化系数：增大 类α中补偿表的量化系数，减少类γ中补偿表的量化系数，类β中补偿表的量化系数保持不变。
④重复步骤②至③，直至满足条件A或条件B时，退出编码。此时能够保证N张补偿表的整体压缩性能最优。
综上，本发明的OLED显示面板的灰阶补偿表的压缩方法在同一组OLED补偿表中，相同色彩分量、不同灰阶补偿表之间，进行帧级差分，提高压缩补偿表的效率和性能；自适应调整各张补偿表的量化系数，在满足整体压缩率的前提下，编码前后各张补偿表的质量均达到预期，或各张补偿表的质量接近。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (14)

  1. 一种OLED显示面板的灰阶补偿表的压缩方法，包括：
    步骤10、在将OLED面板所具有的一组灰阶补偿表传输至编码器以编码时，首先对该组灰阶补偿表中具有相同色彩通道、不同灰阶的多张灰阶补偿表进行差分运算以得到相应的基准图像和差分图像作为该多张灰阶补偿表的替代者；
    步骤20、将该相应的基准图像和差分图像作为该多张灰阶补偿表的替代者传输至编码器；
    步骤30、编码器对接收的灰阶补偿表进行编码压缩。
  2. 如权利要求1所述的OLED显示面板的灰阶补偿表的压缩方法，其中，步骤30中，编码器进行编码压缩时，自适应调整各张补偿表的量化系数：在满足整体压缩率的前提下，使编码前后各张补偿表的质量均达到预期，或各张补偿表的质量接近。
  3. 如权利要求1所述的OLED显示面板的灰阶补偿表的压缩方法，其中，步骤10中，对于具有相同色彩通道、不同灰阶的N张灰阶补偿表，取其中一张灰阶补偿表作为基准图像，其他N－1张灰阶补偿表进行差分操作。
  4. 如权利要求1所述的OLED显示面板的灰阶补偿表的压缩方法，其中，步骤10中，对于具有相同色彩通道、不同灰阶的N张灰阶补偿表，将其分为M组，M≤N/2，每组N/M张灰阶补偿表，对每组灰阶补偿表都做如下处理：取其中一张灰阶补偿表作为基准图像，其他N/M－1张灰阶补偿表进行差分操作。
  5. 如权利要求1所述的OLED显示面板的灰阶补偿表的压缩方法，其中，步骤10中，对于具有相同色彩通道、不同灰阶的N张灰阶补偿表，取其中一张灰阶补偿表作为基准图像，其他N－1张灰阶补偿表进行差分操作得到N－1张差分图像；在N－1张差分图像中，再取一张差分图像作为基准，剩下的N－2张再次进行差分操作。
  6. 如权利要求1所述的OLED显示面板的灰阶补偿表的压缩方法，还包括：解码时得到该相应的基准图像和差分图像，将该相应的基准图像和差分图像彼此相加得解压后的灰阶补偿表。
  7. 如权利要求2所述的OLED显示面板的灰阶补偿表的压缩方法，其中，设解压后的灰阶补偿表需要满足条件A或者条件B：所有图像质量大于Vg，该条件记为A；所有图像中，最佳质量与最次质量之差小于Vt，该 条件记为B；步骤30包括：
    a)量化系数初始化；
    b)压缩编码，若实际压缩率>预设压缩率，则增大量化系数；否则减小量化系数。按照这一准则重复编码，直至量化系数＝Qpbase时满足实际压缩率≤预设压缩率；且量化系数＝Qpbase-1时，实际压缩率>预设压缩率，停止循环；若所有补偿表解压后都满足条件A或B，则退出编码；
    c)否则，设置阈值value1:
    I.根据编码质量从小到大进行排序，设排序后的编码质量评价为V1、V2、V3…VN(V1<V2<…<VN)，对应的补偿表为G1、G2…GN；假定在此编码质量评估方法中，V值越小，质量越高；
    II.以编码质量中等的那张补偿表GN/2为基准，共将N张补偿表分为三类；若Vi<VN/2-value1，则将图片放置到类α中；若VN/2-value1≤Vi≤VN/2+value1，则将图片放置到类β中；若Vi>VN/2+value1，则将图片放置到类γ中；类α中补偿表编码质量最好；类β中补偿表编码质量中等；类γ中补偿表编码质量最差；
    III.减少类γ中补偿表的量化系数，增大类α中补偿表的量化系数，类β中补偿表的量化系数保持不变，进行重新编码；
    重复步骤b)～c)，直至满足条件A或B时，退出编码。
  8. 如权利要求7所述的OLED显示面板的灰阶补偿表的压缩方法，其中，所述图像质量以峰值信噪比来衡量。
  9. 如权利要求7所述的OLED显示面板的灰阶补偿表的压缩方法，其中，所述量化系数初始化为10。
  10. 一种OLED显示面板的灰阶补偿表的压缩方法，包括：
    步骤10、在将OLED面板所具有的一组灰阶补偿表传输至编码器以编码时，首先对该组灰阶补偿表中具有相同色彩通道、不同灰阶的多张灰阶补偿表进行差分运算以得到相应的基准图像和差分图像作为该多张灰阶补偿表的替代者；
    步骤20、将该相应的基准图像和差分图像作为该多张灰阶补偿表的替代者传输至编码器；
    步骤30、编码器对接收的灰阶补偿表进行编码压缩；
    其中，步骤30中，编码器进行编码压缩时，自适应调整各张补偿表的量化系数：在满足整体压缩率的前提下，使编码前后各张补偿表的质量均达到预期，或各张补偿表的质量接近；
    还包括：解码时得到该相应的基准图像和差分图像，将该相应的基准图像和差分图像彼此相加得解压后的灰阶补偿表；
    其中，设解压后的灰阶补偿表需要满足条件A或者条件B：所有图像质量大于Vg，该条件记为A；所有图像中，最佳质量与最次质量之差小于Vt，该条件记为B；步骤30包括：
    d)量化系数初始化；
    e)压缩编码，若实际压缩率>预设压缩率，则增大量化系数；否则减小量化系数。按照这一准则重复编码，直至量化系数＝Qpbase时满足实际压缩率≤预设压缩率；且量化系数＝Qpbase-1时，实际压缩率>预设压缩率，停止循环；若所有补偿表解压后都满足条件A或B，则退出编码；
    f)否则，设置阈值value1:
    I.根据编码质量从小到大进行排序，设排序后的编码质量评价为V1、V2、V3…VN(V1<V2<…<VN)，对应的补偿表为G1、G2…GN；假定在此编码质量评估方法中，V值越小，质量越高；
    II.以编码质量中等的那张补偿表GN/2为基准，共将N张补偿表分为三类；若Vi<VN/2-value1，则将图片放置到类α中；若VN/2-value1≤Vi≤VN/2+value1，则将图片放置到类β中；若Vi>VN/2+value1，则将图片放置到类γ中；类α中补偿表编码质量最好；类β中补偿表编码质量中等；类γ中补偿表编码质量最差；
    III.减少类γ中补偿表的量化系数，增大类α中补偿表的量化系数，类β中补偿表的量化系数保持不变，进行重新编码；
    重复步骤b)～c)，直至满足条件A或B时，退出编码；
    其中，所述图像质量以峰值信噪比来衡量。
  11. 如权利要求10所述的OLED显示面板的灰阶补偿表的压缩方法，其中，步骤10中，对于具有相同色彩通道、不同灰阶的N张灰阶补偿表，取其中一张灰阶补偿表作为基准图像，其他N－1张灰阶补偿表进行差分操作。
  12. 如权利要求10所述的OLED显示面板的灰阶补偿表的压缩方法，其中，步骤10中，对于具有相同色彩通道、不同灰阶的N张灰阶补偿表，将其分为M组，M≤N/2，每组N/M张灰阶补偿表，对每组灰阶补偿表都做如下处理：取其中一张灰阶补偿表作为基准图像，其他N/M－1张灰阶补偿表进行差分操作。
  13. 如权利要求10所述的OLED显示面板的灰阶补偿表的压缩方法，其中，步骤10中，对于具有相同色彩通道、不同灰阶的N张灰阶补偿表，取其中一张灰阶补偿表作为基准图像，其他N－1张灰阶补偿表进行差分操作得到N－1张差分图像；在N－1张差分图像中，再取一张差分图像作为基准，剩下的N－2张再次进行差分操作。
  14. 如权利要求10所述的OLED显示面板的灰阶补偿表的压缩方法，其中，所述量化系数初始化为10。
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