Method and apparatus for performing correction processing on grayscale of a pixel in an image

Patent metadata

Field	Value
Publication number	US-10504400-B2
Application number	US-201815890362-A
Country	US
Kind code	B2
Filing date	Feb 7, 2018
Priority date	Sep 29, 2017
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

Disclosed are an image processing method, apparatus, system and a display device, which can be allowed to perform correction processing on the grayscale of each of the pixels, without any limitation on the shape of the display panel, and have relatively high flexibility. In addition, because the pre-created correction data table has the pixel position, the marker and the correction data contained herein, the correction data are correction data integrated from displaying correction data and edge correction data if the pixel position belongs to the preset edge portion and the correction data are the displaying correction data if the pixel position is other than that belonging to the edge portion, the displaying correction data and the correction data integrated from the displaying correction data and the edge correction data are contained in the correction data table, so that the logic resource occupied in the system can be effectively reduced.

First claim

The invention claimed is:

1. An image processing method, comprising:
receiving a signal for an image to be displayed, wherein the image includes pixels;
performing correction processing on grayscale of each of the pixels in the image to be displayed, according to a pixel position of each of the pixels within an active area of a display panel and a pre-created correction data table containing a pixel position, a marker and correction data, wherein when the pixel position of a pixel belongs to a edge portion, the correction data corresponding to the pixel are correction data integrated from displaying correction data and edge correction data; when the position of the pixel does not belong to the edge portion, the correction data corresponding to the pixel is the displaying correction data; and
displaying the image according to the processed grayscale of each of the pixels.

2. The method according to claim 1 , wherein the displaying correction data is demura correction data;
the operation of performing correction processing on the grayscale of each of the pixels in the image to be displayed according to a pixel position of each of the pixels within an active area of the display panel and the pre-created correction data table containing a pixel position, a marker and correction data, comprises:
determining a marker corresponding to each of the pixels, according to the pre-created correction data table containing a pixel position, a marker and correction data;
determining whether the pixel position of each of the pixels belongs to the edge portion, according to the determined marker corresponding to each of the pixels;
when it is determined that the position of the pixel belongs to the edge portion, performing an edge correction processing and a demura correction processing on the grayscale of the pixel in the image to be displayed, according to the pre-created correction data table containing a pixel position, a marker and correction data; and
when it is determined that the position of the pixel does not belong to the edge portion, performing the demura correction processing on the grayscale of the pixel in the image to be displayed, according to the pre-created correction data table containing a pixel position, a marker and correction data.

3. The method according to claim 2 , the operation of determining whether the pixel position of each of the pixels belongs to the edge portion, according to the determined marker corresponding to each of the pixels comprises:
determining that the pixel position of a pixel belongs to the edge portion when it is determined that the marker corresponding to the pixel is a first marker; and
determining that the pixel position of a pixel does not belong to the edge portion when it is determined that the marker corresponding to the pixel is a second marker.

4. The method according to claim 2 , wherein the operation of performing the edge correction processing and demura correction processing on the grayscale of the pixel in the image to be displayed, according to the pre-created correction data table containing a pixel position, a marker and correction data comprises:
reading the correction data corresponding to the pixel from the correction data table;
invoking a pre-stored first algorithm for performing both of the edge correction processing and demura correction processing, and
performing the edge correction processing and the demura correction processing on the grayscale of the pixel in the image to be displayed, according to the first algorithm and the correction data.

5. The method according to claim 2 , wherein the operation of performing demura correction processing on the grayscale of the pixel in the image to be displayed, according to the pre-created correction data table containing a pixel position, a marker and correction data comprises:
reading the correction data corresponding to the pixel from the correction data table;
invoking a pre-stored second algorithm for performing the demura correction processing; and
performing the demura correction processing on the grayscale of the pixel in the image to be displayed, according to the second algorithm and the correction data.

6. The method according to claim 2 , before receiving the signal for the image to be displayed, a correction data table containing a pixel position, a marker and correction data is determined as follows:
determining the edge portion in the display region, and a marker for indicating whether the pixel position of a pixel belongs to the edge portion, according to the pixel position of each of the pixels within an active area, and an edge correction policy in a preset edge correction rule; wherein the edge portion comprises at least the position at which a jagged edge is located if the display panel is irregular;
determining actual brightness information corresponding to each of the pixels within the active area at multiple groups of grayscales;
determining the demura correction data corresponding to each of the pixels, according to the determined actual brightness information corresponding to each of the pixels at multiple groups of grayscales;
determining the edge correction data corresponding to each of the pixels which belong to the edge portion, according to the pixel position of each of the pixels in the active area and the edge correction algorithm in the edge correction rule;
in accordance with the preset rule, integrating the edge correction data and demura correction data corresponding to each of the pixels which belong to the edge portion to determine the correction data corresponding to each of the pixels which belong to the edge portion;
determining the demura correction data corresponding to each of the pixels not belonging to the edge portion as the correction data corresponding to each of the pixels not belonging to the edge portion; and
creating a correction data table containing a pixel position, a marker and correction data, according to the determined marker and correction data corresponding to each of the pixels and the pixel position of each of the pixels in the display panel.

7. The method according to claim 6 , wherein a position at which each of the pixels is located in the correction data table is mapped one by one into a position at which each of the pixels is located in the active area; and a correction data group comprising a marker and correction data corresponding to a pixel is stored in the position at which the pixel is located in the correction data table.

8. The method according to claim 7 , wherein the correction data group includes n bits; wherein m bits represent a marker, n-m bits represent correction data, m is 1 or 2, and n is 8 or 10.

9. The method according to claim 7 , wherein after creating the correction data table containing a pixel position, a marker and correction data, burning the correction data into a memory.

10. The method according to claim 6 , wherein the edge correction rule at least specifies that as the pixel is closer to the edge of the display panel, the value of the edge correction data for the pixel becomes smaller.

11. The method according to claim 6 , wherein the operation of determining actual brightness information corresponding to each of the pixels within the active area at multiple groups of grayscales comprises:
lighting up the display panel respectively at multiple groups of grayscales;
acquiring, by an optical acquisition device, actual brightness of each of the pixels at the multiple groups of grayscales;
determining actual brightness information of each of the pixels at the multiple groups of grayscales, according to the actual brightness of each of the pixels acquired by the optical acquisitio

Assignees

• Shanghai Tianma Am Oled Co Ltd

Inventors

• Wang Guang
• Zhou Jingxiong

Classifications

• G06T2207/20192

  Edge enhancement; Edge preservation · CPC title

• G09G2320/0271

  Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping · CPC title

• G09G2340/14

  Solving problems related to the presentation of information to be displayed · CPC title

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• G09G3/2003 Primary

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title