WO2019100418A1 - 亮度补偿的装置及方法、存储器 - Google Patents

亮度补偿的装置及方法、存储器 Download PDF

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WO2019100418A1
WO2019100418A1 PCT/CN2017/113411 CN2017113411W WO2019100418A1 WO 2019100418 A1 WO2019100418 A1 WO 2019100418A1 CN 2017113411 W CN2017113411 W CN 2017113411W WO 2019100418 A1 WO2019100418 A1 WO 2019100418A1
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pixel
brightness
gray
compensation factor
pixel points
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PCT/CN2017/113411
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English (en)
French (fr)
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谭力
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武汉华星光电半导体显示技术有限公司
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Priority to US15/736,164 priority Critical patent/US20190385544A1/en
Publication of WO2019100418A1 publication Critical patent/WO2019100418A1/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
    • G09G3/34—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
    • G09G3/36—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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G09G2360/147—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen the originated light output being determined for each pixel
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in 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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to a device and method for brightness compensation, and a memory.
  • OLED products Due to process reasons, OLED products have poor consistency among pixels. OLED products that have not been subjected to any treatment will have a more severe brightness display (MURA). Therefore, OLED products require brightness compensation (DEMURA) for each OLED product before leaving the factory.
  • MURA brightness compensation
  • DEMURA's method is mainly to take pictures of each pixel of an OLED product under several specific gray levels through a high-performance CCD optical camera.
  • the GAMMA curve of the pixel is fitted by the luminance value of each pixel under these gray levels.
  • the brightness compensation factor of the pixel is obtained by comparing the fitted GAMMA curve with the standard 2.2 curve.
  • the brightness compensation factor of all pixels is burned into the FLASH of the display.
  • the DRIVER IC will compensate the corresponding pixels according to the information in the FLASH, thereby improving the brightness unevenness.
  • each pixel point is pre-stored with a brightness compensation factor, and the required storage capacity is large.
  • the DRIVER IC has a large difficulty in designing a large-capacity storage area in terms of design difficulty and cost.
  • the GAMMA curve of each pixel is fitted according to several grayscale brightness values, which may not be accurate, even if the fitted GAMMA curve is accurate, according to the fitted GAMMA curve and the standard curve.
  • the multiplication brightness compensation factor is not necessarily applicable to the compensation under all gray levels, and the final display effect after compensation has great uncertainty.
  • the present invention provides a device and method for brightness compensation, and a memory, which can improve the uniformity of brightness of the display, improve the display effect of the display, and save the storage space of the display.
  • the specific technical solution proposed by the present invention is to provide a method for brightness compensation, the method comprising the steps of:
  • M pixel points are grouped according to luminance values of N gray levels according to each of the M pixel points to obtain a plurality of pixel groups;
  • a brightness compensation factor lookup table is established according to a brightness compensation factor of each of the plurality of pixel groups under N gray levels.
  • the step of grouping the M pixel points according to the brightness values of the N gray levels according to each of the M pixel points, the step of obtaining the plurality of pixel groups specifically includes:
  • the ungrouped pixel points of the M pixel points are sequentially grouped again, until all the pixel points of the M pixel points are completed, and a plurality of pixel groups are obtained.
  • the method for fitting the luminance values of the N gray scales for each of the M pixel points is a polynomial fitting method.
  • the step of grouping the M pixel points according to the brightness values of the N gray levels according to each of the M pixel points, the step of obtaining the plurality of pixel groups specifically includes:
  • the two pixel points are grouped into one group;
  • the ungrouped pixel points of the M pixel points are sequentially grouped again, until all the pixel points of the M pixel points are completed, and a plurality of pixel groups are obtained.
  • the method further comprises: storing the brightness compensation factor lookup table.
  • the value corresponding to each row in the luma compensation factor lookup table is an offset of a luma compensation factor of the pixel group corresponding to the row and the pixel group corresponding to the previous row in N gray scales.
  • the value corresponding to each column in the brightness compensation factor lookup table is an offset of a brightness compensation factor of the plurality of pixel groups corresponding to the column and the plurality of pixel groups corresponding to the previous column respectively under N gray levels the amount.
  • the invention also provides a device for brightness compensation, the device comprising:
  • An acquisition module is configured to collect gray scale images corresponding to each gray scale of the N gray scales to obtain N gray scale images
  • a brightness obtaining module configured to acquire brightness values of M pixels of each of the gray scale images of the N gray scale images, and obtain brightness values of N gray scales of each of the M pixel points;
  • a grouping module configured to group M pixel points according to brightness values of N gray levels according to each of the M pixel points to obtain a plurality of pixel groups
  • a calculation module configured to calculate, according to an average brightness value of each pixel group of each of the plurality of pixel groups, a brightness compensation factor of each pixel group under each gray level, and obtain a plurality of pixel groups a brightness compensation factor for each pixel group under N gray levels;
  • a table building module configured to establish a brightness compensation factor lookup table according to a brightness compensation factor of each of the plurality of pixel groups under N gray levels.
  • the acquisition module is a CCD.
  • the present invention also provides a memory in which a plurality of instructions are stored, the plurality of instructions being adapted to be loaded and executed by a processor:
  • M pixel points are grouped according to luminance values of N gray levels according to each of the M pixel points to obtain a plurality of pixel groups;
  • a brightness compensation factor lookup table is established according to a brightness compensation factor of each of the plurality of pixel groups under N gray levels.
  • the method for brightness compensation proposed by the present invention obtains the brightness compensation factor of each group of pixels under each gray level by grouping different pixel points, and establishes brightness according to the brightness compensation factor of each pixel group under each gray level.
  • the compensation factor lookup table only needs to obtain the brightness compensation factor of the pixel group under the gray level according to the group number and the gray level of the pixel group in which the pixel is located in the subsequent brightness compensation, each pixel point in each Under the gray scale, a brightness compensation factor is added, which improves the uniformity of the brightness of the display and improves the display effect of the display.
  • the storage space of the display is greatly saved by grouping.
  • Embodiment 1 is a flow chart of a method of brightness compensation in Embodiment 1;
  • Embodiment 2 is a schematic structural view of an apparatus for brightness compensation in Embodiment 1;
  • FIG. 3 is a schematic structural diagram of a grouping module in Embodiment 1;
  • FIG. 4 is a schematic structural diagram of a memory and a processor in Embodiment 1.
  • the method for brightness compensation provided by this embodiment includes the following steps:
  • step S1 the number of gray scales is 256, and it is necessary to collect gray scale images corresponding to 256 gray scales respectively, that is, 256 gray scale images need to be collected.
  • step S2 the number of pixels is determined according to the resolution of the display.
  • the resolution of the display is high, the number of pixels is large, that is, the value of M is relatively large, and the resolution of the display is low, and the number of pixels is small. That is, the value of M is relatively small.
  • the value of M is 5
  • the value of N is 3
  • the luminance values of 5 pixel points under 3 gray levels are (x 11 , y 12 , z 13 ), (x 21 , y 22 , z 23 , respectively).
  • the luminance values of 5 pixel points under 3 gray levels are (x 11 , y 12 , z 13 ), (x 21 , y 22 , z 23 , respectively).
  • the luminance values of 5 pixel points under 3 gray levels are (x 11 , y 12 , z 13 ), (x 21 , y 22 , z 23 , respectively).
  • the x 31 , y 32 , z 33 e.g., x 41 , y 42 , z 43
  • the first, second, and fourth The pixel belongs to the first pixel group
  • the third and fifth pixel points belong to the second pixel group.
  • step S4 the average luminance values of the first pixel group under three gray levels are respectively The average brightness value of the second pixel group under three gray levels is The brightness compensation factor of the pixel group at each gray level is calculated according to the average brightness value of each pixel group under each gray level.
  • step S4 the present embodiment acquires the brightness compensation factor in the following manner. First, obtain the brightness value of the standard 2.2 curve under each gray level, then according to the average brightness value of each pixel group under each gray level, and finally according to the average brightness value and standard of each pixel group under each gray level.
  • the brightness compensation factor can also be calculated by other existing methods, which is not limited herein.
  • the brightness compensation factors of the first pixel group under three gray levels are ⁇ 11 , ⁇ 12 , ⁇ 13 respectively, and the brightness compensation factors of the second pixel group under three gray levels are respectively ⁇ 21 , ⁇ 22 , ⁇ 23 .
  • step S5 each pixel group is numbered, and a brightness compensation factor lookup table is established according to the brightness compensation factor of each pixel group under each gray level, so that the brightness compensation factor lookup table is directly called later, and the table below is brightness.
  • the method for brightness compensation further includes storing a brightness compensation factor lookup table, wherein the brightness compensation factor lookup table is burned into the flash of the display, and the brightness compensation can be directly called when the display performs brightness compensation.
  • Factor lookup table is storing a brightness compensation factor lookup table, wherein the brightness compensation factor lookup table is burned into the flash of the display, and the brightness compensation can be directly called when the display performs brightness compensation.
  • the brightness compensation factor of the grouped pixel groups under each gray level is obtained, and a brightness compensation factor lookup table is established according to the brightness compensation factor of each pixel group under each gray level, which is performed in the subsequent In the brightness compensation, it is only necessary to obtain the brightness compensation factor of the pixel group under the gray level according to the group number and the gray level of the pixel group in which the pixel is located, and each pixel point corresponds to a brightness compensation under each gray level.
  • the factor which improves the uniformity of the brightness of the display, improves the display effect of the display, and at the same time, greatly saves the storage space of the display by grouping.
  • step S3 includes:
  • each of the M pixel points is in the The method of fitting the luminance values of the N gray scales is a polynomial fitting method.
  • the values of a, b, and c are obtained to obtain the brightness fitting curve of the first pixel, and the above process is repeated to sequentially obtain the brightness fitting curves of the second, third, fourth, and fifth pixel points.
  • step S33 repeating step S32, sequentially grouping the ungrouped pixel points of the M pixel points, until all the pixel points of the M pixel points are completed, and obtaining a plurality of pixel groups, that is, for the third and fifth
  • the pixels are grouped, and the correlation coefficient between the brightness fitting curve of the third pixel and the brightness fitting curve of the fifth pixel is calculated to be greater than 0.9, and if greater, the third and fifth pixels are The point belongs to the second pixel group. If it is not greater than, the third pixel belongs to the second pixel group, and the fifth pixel belongs to the third pixel group. In this embodiment, the third and fifth pixels are assumed.
  • the point belongs to the second pixel group.
  • the device for brightness compensation includes an acquisition module 1, a brightness acquisition module 2, a grouping module 3, a calculation module 4, and a table construction module 5.
  • the acquisition module 1 is configured to collect gray scale images corresponding to each gray scale of the N gray scales, and obtain N gray scale images.
  • the brightness obtaining module 2 is configured to acquire brightness values of M pixels of each of the N grayscale images, and obtain brightness values of the N gray levels of each of the M pixel points.
  • the grouping module 3 is configured to group the M pixel points according to the brightness values of the N gray levels according to each of the M pixel points to obtain a plurality of pixel groups.
  • the calculation module 4 is configured to calculate a brightness compensation factor of the pixel group under each gray level according to an average brightness value of each pixel group of each of the plurality of pixel groups, and obtain a plurality of pixel groups.
  • the table building module 5 is configured to establish a brightness compensation factor lookup table according to the brightness compensation factors of each of the plurality of pixel groups under N gray levels.
  • the acquisition module 1 in this embodiment is a CCD.
  • the grouping module 3 further includes a fitting unit 31 and a cross-correlation calculation unit 32.
  • the fitting unit 31 is configured to fit the luminance values of the N gray scales for each of the M pixel points to obtain a brightness fitting curve corresponding to each pixel point.
  • the cross-correlation calculation unit 32 is configured to calculate a correlation coefficient between a brightness fitting curve corresponding to each pixel point of the M pixel points and a brightness fitting curve corresponding to other pixel points in the M pixel points, and the correlation coefficient Other pixel points larger than the first threshold are grouped with the pixel points.
  • the embodiment further provides a memory 6 in which a plurality of instructions are stored, the plurality of instructions being adapted to be loaded and executed by the processor 7: collecting each of the N gray scales Obtaining N gray scale images corresponding to the gray scale image corresponding to the order; obtaining brightness values of M pixel points of each gray scale image in the N gray scale images, obtaining each pixel point of the M pixel points in N grays a luminance value of the order; grouping the M pixel points according to the luminance values of the N gray scales according to each of the M pixel points to obtain a plurality of pixel groups; according to the pixel points of each of the plurality of pixel groups Calculating a brightness compensation factor of each pixel group under each gray level by using an average brightness value under each gray level, and obtaining a brightness compensation factor of each of the plurality of pixel groups under N gray levels; A brightness compensation factor lookup table is established for each of the pixel groups in each pixel group under the N gray scales.
  • Embodiment 1 differs from Embodiment 1 in the grouping method employed and the method of establishing a brightness compensation factor lookup table.
  • Step S3 in this embodiment includes:
  • S31 calculates the difference between the luminance values of any two of the M pixels in each pixel in a gray scale, by way of example, the luminance values of five pixels in three gradations are (x 11, y 12, z 13 ), (x 21 , y 22 , z 23 ), (x 31 , y 32 , z 33 ), (x 41 , y 42 , z 43 ), (x 51 , y 52 , z 53 ), calculation
  • the difference between the luminance values of one pixel point and the second, third, fourth, and fifth pixel points under three gray levels is x 11 -x 21 , y 12 -y 22 , z 13 - z 23 , x 11 -x 31 , y 12 -y 32 , z 13 -z 33 , x 11 -x 41 , y 12 -y 42 , z 13 -z 43 , x 11 -x 51 , y 12 -y 52 , z 13
  • the second threshold is 2, if x 11 -x 21 ⁇ 2 , y 12 -y 22 ⁇ 2, z 13 -z 23 ⁇ 2, x 11 -x 41 ⁇ 2, y 12 -y 42 ⁇ 2, z 13 -z 43 ⁇ 2, then the first, second, The fourth pixel belongs to the first pixel group;
  • step S33 repeating step S32, sequentially grouping the ungrouped pixel points of the M pixel points
  • the third and fifth pixel points are grouped, and the third pixel point and the fifth pixel point are calculated in three gray levels.
  • the difference in luminance values under the order is x 31 -x 51 , y 32 -y 52 , z 33 -z 53 , if x 31 -x 51 ⁇ 2, y 32 -y 52 ⁇ 2, z 33 -z 53 ⁇ 2, the third and fifth pixels belong to the second pixel group. If not, the third pixel belongs to the second pixel group, and the fifth pixel belongs to the third pixel group. It is assumed in the embodiment that the third and fifth pixel points belong to the second pixel group.
  • each pixel group is numbered, and a brightness compensation factor lookup table is established according to a brightness compensation factor of each pixel group under each gray level, wherein each row of the brightness compensation factor lookup table corresponds to The value is the offset of the luminance compensation factor of the pixel group corresponding to the row and the pixel group corresponding to the previous row in the N gray scales, and the following table is taken as an example:
  • the corresponding value of each column in the lookup table is a partial value of the brightness compensation factor of the plurality of pixel groups corresponding to the column and the plurality of pixel groups corresponding to the previous column respectively under N gray levels.
  • the brightness compensation factor lookup table can also be established by defining the offset of the brightness compensation factor in other ways.

Abstract

本发明提供一种亮度补偿的装置及方法、存储器，所述方法包括步骤：采集N个灰阶中每一个灰阶所对应的灰阶图像；获取N个灰阶图像中每一个灰阶图像的M个像素点的亮度值；根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组；根据多个像素组中每一个像素组的像素点在每一个灰阶下的平均亮度值计算所述像素组在每一个灰阶下的亮度补偿因子，获得多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子；根据多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子建立亮度补偿因子查找表。本发明提出的亮度补偿的方法提升了显示器的亮度的均匀性，改善了显示器的显示效果，节省了显示器的存储空间。

Description

亮度补偿的装置及方法、存储器 技术领域
本发明涉及液晶显示技术领域，尤其涉及一种亮度补偿的装置及方法、存储器。
背景技术
OLED产品由于制程原因，各像素点的一致性较差。未经过任何处理的OLED产品会有较严重的亮度显示不均(MURA)。因此，OLED产品在出厂之前，需要对每片OLED产品进行亮度补偿(DEMURA)。
目前，DEMURA的方法主要是通过高性能的CCD光学照相机对OLED产品的每个像素点在数个特定灰阶下进行拍照。通过每个像素点在这些灰阶下的亮度值来拟合出该像素点的GAMMA曲线。通过拟合出的GAMMA曲线和标准2.2曲线进行对比计算得到该像素点的亮度补偿因子。将所有像素点的亮度补偿因子烧录到显示器的FLASH中。在OLED产品显示时，DRIVER IC会根据FLASH中的信息对相应像素点做亮度补偿，从而达到改善亮度不均的效果。该方法中每个像素点要预存亮度补偿因子，所需的存储容量较大，而DRIVER IC由于内部空间有限，布置大容量的存储区在设计难度和成本上都会面临很大的困难。而且，每个像素点的GAMMA曲线是根据几个灰阶亮度值拟合出来的，实际可能并不准确，即使拟合出的GAMMA曲线是准确的，根据拟合出的GAMMA曲线和标准曲线得到的乘亮度补偿因子也不一定适用于所有灰阶下的补偿，最终补偿后的显示效果有很大的不确定性。
发明内容
为了解决现有技术的不足，本发明提供一种亮度补偿的装置及方法、存储器，能够提升显示器的亮度的均匀性，改善显示器的显示效果，同时能够节省显示器的存储空间。
本发明提出的具体技术方案为：提供一种亮度补偿的方法，所述方法包括步骤：
采集N个灰阶中每一个灰阶所对应的灰阶图像，获得N个灰阶图像；
获取N个灰阶图像中每一个灰阶图像的M个像素点的亮度值，获得M个像素点中每一个像素点在N个灰阶的亮度值；
根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组；
根据多个像素组中每一个像素组的像素点在每一个灰阶下的平均亮度值计算所述像素组在每一个灰阶下的亮度补偿因子，获得多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子；
根据多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子建立亮度补偿因子查找表。
可选地，所述根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组步骤具体包括：
对M个像素点中每一个像素点在N个灰阶的亮度值进行拟合，分别获得每一个像素点对应的亮度拟合曲线；
计算M个像素点中每一个像素点对应的亮度拟合曲线与M个像素点中其他像素点对应的亮度拟合曲线之间的互相关系数，将互相关系数大于第一阈值的其他像素点与所述像素点分为一组；
依次对M个像素点中未分组的像素点再次进行分组，直到M个像素点中所有的像素点均完成分组，获得多个像素组。
可选地，对M个像素点中每一个像素点在N个灰阶的亮度值进行拟合采用的方法为多项式拟合方法。
可选地，所述根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组步骤具体包括：
计算M个像素点中任意两个像素点在每一个灰阶下的亮度值之差；
若所述两个像素点在每一个灰阶下的亮度值之差小于第二阈值，则将所述两个像素点分为一组；
依次对M个像素点中未分组的像素点再次进行分组，直到M个像素点中所有的像素点均完成分组，获得多个像素组。
可选地，在根据多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子建立亮度补偿因子查找表步骤之后，所述方法还包括：存储所述亮度补偿因子查找表。
可选地，所述亮度补偿因子查找表中每一行对应的值为所述行对应的像素组与上一行对应的像素组分别在N个灰阶下的亮度补偿因子的偏移量。
可选地，所述亮度补偿因子查找表中每一列对应的值为所述列对应的多个像素组与前一列对应的多个像素组分别在N个灰阶下的亮度补偿因子的偏移量。
本发明还提供了一种亮度补偿的装置，所述装置包括：
采集模块，用于采集N个灰阶中每一个灰阶所对应的灰阶图像，获得N个灰阶图像；
亮度获取模块，用于获取N个灰阶图像中每一个灰阶图像的M个像素点的亮度值，获得M个像素点中每一个像素点在N个灰阶的亮度值；
分组模块，用于根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组；
计算模块，用于根据多个像素组中每一个像素组的像素点在每一个灰阶下的平均亮度值计算所述像素组在每一个灰阶下的亮度补偿因子，获得多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子；
建表模块，用于根据多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子建立亮度补偿因子查找表。
可选地，所述采集模块为CCD。
本发明还提供了一种存储器，所述存储器中存储有多条指令，所述多条指令适于由处理器加载并执行：
采集N个灰阶中每一个灰阶所对应的灰阶图像，获得N个灰阶图像；
获取N个灰阶图像中每一个灰阶图像的M个像素点的亮度值，获得M个像素点中每一个像素点在N个灰阶的亮度值；
根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组；
根据多个像素组中每一个像素组的像素点在每一个灰阶下的平均亮度值计算所述像素组在每一个灰阶下的亮度补偿因子，获得多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子；
根据多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子建立亮度补偿因子查找表。
本发明提出的亮度补偿的方法通过将不同的像素点进行分组，得到分组后的像素组在各个灰阶下的亮度补偿因子，根据每一个像素组在每一个灰阶下的亮度补偿因子建立亮度补偿因子查找表，在后续进行亮度补偿时只需要根据该像素点所在的像素组的组号及灰阶便可以得到该像素组在该灰阶下的亮度补偿因子，每一个像素点在每一个灰阶下都对应一个亮度补偿因子，提升了显示器的亮度的均匀性，改善了显示器的显示效果，同时，通过分组大大节省了显示器的存储空间。
附图说明
图1为实施例1中亮度补偿的方法的流程图；
图2为实施例1中亮度补偿的装置的结构示意图；
图3为实施例1中分组模块的结构示意图；
图4为实施例1中存储器与处理器的结构示意图。
具体实施方式
以下，将参照附图来详细描述本发明的实施例。然而，可以以许多不同的形式来实施本发明，并且本发明不应该被解释为限制于这里阐述的具体实施例。相反，提供这些实施例是为了解释本发明的原理及其实际应用，从而使本领域的其他技术人员能够理解本发明的各种实施例和适合于特定预期应用的各种修改。在附图中，相同的标号将始终被用于表示相同的元件。
实施例1
参照图1，本实施例提供的亮度补偿的方法包括步骤：
S1、采集N个灰阶中每一个灰阶所对应的灰阶图像，获得N个灰阶图像；
S2、获取N个灰阶图像中每一个灰阶图像的M个像素点的亮度值，获得M个像素点中每一个像素点在N个灰阶的亮度值；
S3、根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组；
S4、根据多个像素组中每一个像素组的像素点在每一个灰阶下的平均亮度值计算所述像素组在每一个灰阶下的亮度补偿因子，获得多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子；
S5、根据多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子建立亮度补偿因子查找表。
在步骤S1中，灰阶的数量为256，需要采集256个灰阶分别对应的灰阶图像即需要采集256个灰阶图像。
在步骤S2中，像素点的个数根据显示器的分辨率确定，显示屏的分辨率高则像素点的个数多即M的值比较大，显示屏的分辨率低则像素点的个数少即M的值比较小。获得每一个灰阶图像的M个像素点的亮度值便可以得到M个像素点在N个灰阶下的亮度值，本实施例中第i个像素点在第j个灰阶下的亮度值为xij,1≤i≤M,1≤j≤N。
作为示例，M的值为5，N的值为3，5个像素点在3个灰阶下的亮度值分别为(x11,y12,z13)、(x21,y22,z23)、(x31,y32,z33)、(x41,y42,z43)、(x51,y52,z53)在步骤S3中，第1个、第2个、第4个像素点属于第一个像素组，第3个、第5个 像素点属于第二个像素组。在步骤S4中，第一个像素组在3个灰阶下的平均亮度值分别为
Figure PCTCN2017113411-appb-000001
第二个像素组在3个灰阶下的平均亮度值分别为
Figure PCTCN2017113411-appb-000002
根据每个像素组在每个灰阶下的平均亮度值计算得到该像素组在每个灰阶下的亮度补偿因子。
在步骤S4中，本实施例通过下面的方式来获取亮度补偿因子。首先获取标准2.2曲线在每个灰阶下的亮度值，然后根据每个像素组在每个灰阶下的平均亮度值，最后根据每个像素组在每个灰阶下的平均亮度值和标准2.2曲线在每个灰阶下的亮度值，分别获取该像素组在每个灰阶下的亮度补偿因子。例如，假设标准2.2曲线在32灰阶下的亮度值为A，第一个像素组在32灰阶下的平均亮度值为B，则第一个像素组在32灰阶下的亮度补偿因子为δ＝A/B。这里，亮度补偿因子也可以采用现有的其他方法来计算，这里不做限定。通过计算后便可以得到第一个像素组在3个灰阶下的亮度补偿因子分别为δ11，δ12，δ13，第二个像素组在3个灰阶下的亮度补偿因子分别为δ21，δ22，δ23。
在步骤S5中，对每一个像素组进行编号，根据每一个像素组在每一个灰阶下的亮度补偿因子建立亮度补偿因子查找表，以便后面直接调用该亮度补偿因子查找表，下表为亮度补偿因子查找表的一个示例：
表一亮度补偿因子查找表
Figure PCTCN2017113411-appb-000003
在步骤S5之后，所述亮度补偿的方法还包括存储亮度补偿因子查找表，其中，将亮度补偿因子查找表烧录至显示器的Flash中，显示器在进行亮度补偿的时候便可以直接调用该亮度补偿因子查找表。
通过将不同的像素点进行分组，得到分组后的像素组在各个灰阶下的亮度补偿因子，根据每一个像素组在每一个灰阶下的亮度补偿因子建立亮度补偿因子查找表，在后续进行亮度补偿时只需要根据该像素点所在的像素组的组号及灰阶便可以得到该像素组在该灰阶下的亮度补偿因子，每一个像素点在每一个灰阶下都对应一个亮度补偿因子，从而提升了显示器的亮度的均匀性，改善了显示器的显示效果，同时，通过分组大大节省了显示器的存储空间。
具体地，步骤S3包括：
S31、对M个像素点中每一个像素点在N个灰阶的亮度值进行拟合，分别获得每一个像素点对应的亮度拟合曲线；其中，对M个像素点中每一个像素点在N个灰阶的亮度值进行拟合采用的方法为多项式拟合方法，作为示例，假设3个灰阶为32灰阶、64灰阶、128灰阶，则第1个像素点对应的三个拟合点为(32，x11)，(64，y12)，(128，z13)，拟合多项式为f(x)＝ax2+bx+c，根据三个拟合点便可以确定a，b，c的值，从而获得第1个像素点的亮度拟合曲线，重复上面的过程依次获取第2个、第3个、第4个、第5个像素点的亮度拟合曲线。
S32、计算M个像素点中每一个像素点对应的亮度拟合曲线与M个像素点中其他像素点对应的亮度拟合曲线之间的互相关系数，将互相关系数大于第一阈值的其他像素点与所述像素点分为一组，作为示例，第一阈值为0.9，分别计算第1个像素点的亮度拟合曲线与第2个、第3个、第4个、第5个像素点的亮度拟合曲线的互相关系数，第1个与第2个、第4个像素点的互相关系数均大于0.9，则第1个、第2个、第4个像素点属于第一个像素组；
S33、重复步骤S32，依次对M个像素点中未分组的像素点再次进行分组，直到M个像素点中所有的像素点均完成分组，获得多个像素组，即对第3个、第5个像素点进行分组，计算第3个像素点的亮度拟合曲线与第5个像素点的亮度拟合曲线之间的互相关系数是否大于0.9，若大于，则第3个、第5个像素点属于第二个像素组，若不大于，则第3个像素点属于第二个像素组，第5个像素点属于第三个像素组，本实施例中假设第3个、第5个像素点属于第二个像素组。
参照图2，本实施示例提供的亮度补偿的装置包括采集模块1、亮度获取模块2、分组模块3、计算模块4、建表模块5。
采集模块1用于采集N个灰阶中每一个灰阶所对应的灰阶图像，获得N个灰阶图像。亮度获取模块2用于获取N个灰阶图像中每一个灰阶图像的M个像素点的亮度值，获得M个像素点中每一个像素点在N个灰阶的亮度值。分组模块3用于根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组。计算模块4用于根据多个像素组中每一个像素组的像素点在每一个灰阶下的平均亮度值计算所述像素组在每一个灰阶下的亮度补偿因子，获得多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子。建表模块5用于根据多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子建立亮度补偿因子查找表。本实施例中的采集模块1为CCD。
参照图3，分组模块3还包括拟合单元31、互相关系数计算单元32。拟合单元31用于对M个像素点中每一个像素点在N个灰阶的亮度值进行拟合，分别获得每一个像素点对应的亮度拟合曲线。互相关系数计算单元32用于计算M个像素点中每一个像素点对应的亮度拟合曲线与M个像素点中其他像素点对应的亮度拟合曲线之间的互相关系数，将互相关系数大于第一阈值的其他像素点与所述像素点分为一组。
参照图4，本实施例还提供了一种存储器6，所述存储器6中存储有多条指令，所述多条指令适于由处理器7加载并执行：采集N个灰阶中每一个灰阶所对应的灰阶图像，获得N个灰阶图像；获取N个灰阶图像中每一个灰阶图像的M个像素点的亮度值，获得M个像素点中每一个像素点在N个灰阶的亮度值；根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组；根据多个像素组中每一个像素组的像素点在每一个灰阶下的平均亮度值计算所述像素组在每一个灰阶下的亮度补偿因子，获得多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子；根据多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子建立亮度补偿因子查找表。
实施例2
本实施例与实施例1的不同之处在于采用的分组方法以及建立亮度补偿因子查找表的方法。
本实施例中的步骤S3包括：
S31、计算M个像素点中任意两个像素点在每一个灰阶下的亮度值之差，作为示例，5个像素点在3个灰阶下的亮度值分别为(x11,y12,z13)、(x21,y22,z23)、(x31,y32,z33)、(x41,y42,z43)、(x51,y52,z53)，计算第1个像素点与第2个、第3个、第4个、第5个像素点在3个灰阶下的亮度值之差分别为x11-x21,y12-y22,z13-z23，x11-x31,y12-y32,z13-z33，x11-x41,y12-y42,z13-z43，x11-x51,y12-y52,z13-z53。
S32、若两个像素点在每一个灰阶下的亮度之差小于第二阈值，则将两个像素点分为一组，作为示例，第二阈值为2，若x11-x21≤2,y12-y22≤2,z13-z23≤2，x11-x41≤2,y12-y42≤2,z13-z43≤2，则第1个、第2个、第4个像素点属于第一个像素组；
S33、重复步骤S32，依次对M个像素点中未分组的像素点再次进行分组，
直到M个像素点中所有的像素点均完成分组，获得多个像素组，即对第3个、第5个像素点进行分组，计算第3个像素点与第5个像素点在3个灰阶下的亮度值之差分别为x31-x51,y32-y52,z33-z53，若满足x31-x51≤2,y32-y52≤2,z33-z53≤2，则第3个、第5个像素点属于第二个像素组，若不满足，则第3个像素点属于第二个像素组，第5个像素点属于第三个像素组，本实施例中假设第3个、第5个像素点属于第二个像素组。
本实施例在步骤S5中，对每一个像素组进行编号，根据每一个像素组在每一个灰阶下的亮度补偿因子建立亮度补偿因子查找表，其中，亮度补偿因子查找表中每一行对应的值为所述行对应的像素组与上一行对应的像素组分别在N个灰阶下的亮度补偿因子的偏移量，以下表为例：
表二亮度补偿因子查找表
Figure PCTCN2017113411-appb-000004
其中，第二个像素组在3个灰阶下的亮度补偿因子分别为δ21＝δ11+2，δ22＝δ12-1，δ23＝δ13+1，由于两个像素组之间的亮度补偿因子的差值不会太大，因此，通过像素组分别在N个灰阶下的亮度补偿因子的偏移量建立亮度补偿因子查找表可以进一步的节省存储空间。
本实施例中还可以根据亮度补偿因子查找表中每一列对应的值为所述列对应的多个像素组与前一列对应的多个像素组分别在N个灰阶下的亮度补偿因子的偏移量来建立亮度补偿因子查找表，如下表所示：
表三亮度补偿因子查找表
Figure PCTCN2017113411-appb-000005
其中，第一个像素组在3个灰阶下的亮度补偿因子分别为δ11，δ12＝δ11+3，δ13＝δ12+1＝δ11+4，第二个像素组在3个灰阶下的亮度补偿因子分别为δ21，δ22＝δ21+2，δ23＝δ22-1＝δ21+1。
当然，还可以通过定义其他方式的亮度补偿因子的偏移量来建立亮度补偿因子查找表。
以上所述仅是本申请的具体实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。

Claims (10)

  1. 一种亮度补偿的方法，其中，包括步骤：
    采集N个灰阶中每一个灰阶所对应的灰阶图像，获得N个灰阶图像；
    获取N个灰阶图像中每一个灰阶图像的M个像素点的亮度值，获得M个像素点中每一个像素点在N个灰阶的亮度值；
    根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组；
    根据多个像素组中每一个像素组的像素点在每一个灰阶下的平均亮度值计算所述像素组在每一个灰阶下的亮度补偿因子，获得多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子；
    根据多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子建立亮度补偿因子查找表。
  2. 根据权利要求1所述的方法，其中，所述根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组步骤具体包括：
    对M个像素点中每一个像素点在N个灰阶的亮度值进行拟合，分别获得每一个像素点对应的亮度拟合曲线；
    计算M个像素点中每一个像素点对应的亮度拟合曲线与M个像素点中其他像素点对应的亮度拟合曲线之间的互相关系数，将互相关系数大于第一阈值的其他像素点与所述像素点分为一组；
    依次对M个像素点中未分组的像素点再次进行分组，直到M个像素点中所有的像素点均完成分组，获得多个像素组。
  3. 根据权利要求2所述的方法，其中，对M个像素点中每一个像素点在N个灰阶的亮度值进行拟合采用的方法为多项式拟合方法。
  4. 根据权利要求1所述的方法，其中，所述根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组步骤具体包括：
    计算M个像素点中任意两个像素点在每一个灰阶下的亮度值之差；
    若所述两个像素点在每一个灰阶下的亮度值之差小于第二阈值，则将所述两个像素点分为一组；
    依次对M个像素点中未分组的像素点再次进行分组，直到M个像素点中所有的像素点均完成分组，获得多个像素组。
  5. 根据权利要求1所述的方法，其中，在根据多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子建立亮度补偿因子查找表步骤之后，所述方法还包括：存储所述亮度补偿因子查找表。
  6. 根据权利要求5所述的方法，其中，所述亮度补偿因子查找表中每一行对应的值为所述行对应的像素组与上一行对应的像素组分别在N个灰阶下的亮度补偿因子的偏移量。
  7. 根据权利要求5所述的方法，其中，所述亮度补偿因子查找表中每一列对应的值为所述列对应的多个像素组与前一列对应的多个像素组分别在N个灰阶下的亮度补偿因子的偏移量。
  8. 一种亮度补偿的装置，其中，包括：
    采集模块，用于采集N个灰阶中每一个灰阶所对应的灰阶图像，获得N个灰阶图像；
    亮度获取模块，用于获取N个灰阶图像中每一个灰阶图像的M个像素点的亮度值，获得M个像素点中每一个像素点在N个灰阶的亮度值；
    分组模块，用于根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组；
    计算模块，用于根据多个像素组中每一个像素组的像素点在每一个灰阶下的平均亮度值计算所述像素组在每一个灰阶下的亮度补偿因子，获得多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子；
    建表模块，用于根据多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子建立亮度补偿因子查找表。
  9. 根据权利要求8所述的装置，其中，所述采集模块为CCD。
  10. 一种存储器，其中，所述存储器中存储有多条指令，所述多条指令适于由处理器加载并执行：
    采集N个灰阶中每一个灰阶所对应的灰阶图像，获得N个灰阶图像；
    获取N个灰阶图像中每一个灰阶图像的M个像素点的亮度值，获得M个像素点中每一个像素点在N个灰阶的亮度值；
    根据M个像素点中每一个像素点在N个灰阶的亮度值将M个像素点进行分组，获得多个像素组；
    根据多个像素组中每一个像素组的像素点在每一个灰阶下的平均亮度值计算所述像素组在每一个灰阶下的亮度补偿因子，获得多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子；
    根据多个像素组中每一个像素组分别在N个灰阶下的亮度补偿因子建立亮度补偿因子查找表。
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