Local demura algorithms for correcting display artifacts

Patent metadata

Field	Value
Publication number	US-12469428-B1
Application number	US-202418757227-A
Country	US
Kind code	B1
Filing date	Jun 27, 2024
Priority date	Jun 27, 2024
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

Implementations of local demura algorithms for correcting display artifacts are provided. One aspect includes a method comprising: receiving image data; segmenting the image data into a plurality of regions of interest; applying a plurality of demura algorithms to the plurality of regions of interest to generate a plurality of corrected regions of interest by at least: applying a first demura algorithm to a first region of interest; and applying a second demura algorithm different from the first demura algorithm to a second region of interest; and generating a corrected image using at least the plurality of corrected regions of interest.

First claim

The invention claimed is:

1 . A method for performing local demura corrections for processing display artifacts, the method comprising:
receiving image data; segmenting the image data into a plurality of regions of interest; applying a plurality of demura algorithms to the plurality of regions of interest to generate a plurality of corrected regions of interest by at least:
applying a first demura algorithm to a first region of interest; and
applying a second demura algorithm different from the first demura algorithm to a second region of interest;
generating a corrected image using at least the plurality of corrected regions of interest; determining whether the corrected image satisfies one or more predetermined criteria, wherein the one or more predetermined criteria comprises determining whether structural similarity indices of the plurality of corrected regions of interest are within a predetermined range; and upon determining that the corrected image satisfies the one or more predetermined criteria, outputting demura parameters associated with the plurality of demura algorithms.

2 . The method of claim 1 , further comprising:
upon determining that the corrected image does not satisfy the one or more predetermined criteria:
adjusting demura parameters associated with the plurality of demura algorithms;
applying the plurality of demura algorithms to the plurality of regions of interest using the adjusted demura parameters to generate an updated plurality of corrected regions of interest; and
generating an updated corrected image using at least the updated plurality of corrected regions of interest.

3 . The method of claim 2 , wherein adjusting the demura parameters comprises adjusting a correction strength of at least one of the demura parameters.

4 . The method of claim 1 , wherein each of the plurality of demura algorithms comprises a correction strength derived from a contrast sensitivity function and a spatial frequency of the region of interest to which the demura algorithm is applied.

5 . The method of claim 1 , wherein the plurality of demura algorithms comprises one or more of applying a dithering process, applying a low pass filter, or applying a pixel-by-pixel look-up-table correction.

6 . The method of claim 1 , wherein segmenting the image data is performed using manual user selection.

7 . The method of claim 1 , wherein segmenting the image data is performed using an automatic process comprising one or more of adaptive thresholding, edge detection, or clustering techniques.

8 . The method of claim 1 , wherein applying the plurality of demura algorithms further comprises:
for each of the plurality of regions of interest, determining whether a display artifact is present, wherein the demura algorithm to be applied to the region of interest is selected based on a type of the determined display artifact.

9 . A computing system for performing local demura corrections for processing display artifacts, the computing system comprising:
processing circuitry and memory storing instructions that, during execution, cause the processing circuitry to:
receive image data;
segment the image data into a plurality of regions of interest;
apply a plurality of demura algorithms to the plurality of regions of interest to generate a plurality of corrected regions of interest by at least:
applying a first demura algorithm to a first region of interest; and
applying a second demura algorithm different from the first demura algorithm to a second region of interest;

generate a corrected image using at least the plurality of corrected regions of interest;
determine whether the corrected image satisfies one or more predetermined criteria, wherein the one or more predetermined criteria comprises determining whether structural similarity indices of the plurality of corrected regions of interest are within a predetermined range; and
upon determining that the corrected image satisfies the one or more predetermined criteria, output demura parameters associated with the plurality of demura algorithms.

10 . The computing system of claim 9 , wherein the instructions, during execution, further cause the processing circuitry to:
upon determining that the corrected image does not satisfy the one or more predetermined criteria:
adjust demura parameters associated with the plurality of demura algorithms;
apply the plurality of demura algorithms to the plurality of regions of interest using the adjusted demura parameters to generate an updated plurality of corrected regions of interest; and
generate an updated corrected image using at least the updated plurality of corrected regions of interest.

11 . The computing system of claim 10 , wherein adjusting the demura parameters comprises adjusting a correction strength of at least one of the demura parameters.

12 . The computing system of claim 9 , wherein each of the plurality of demura algorithms comprises a correction strength derived from a contrast sensitivity function and a spatial frequency of the region of interest to which the demura algorithm is applied.

13 . The computing system of claim 9 , wherein the plurality of demura algorithms comprises one or more of applying a dithering process, applying a low pass filter, or applying a pixel-by-pixel look-up-table correction.

14 . The computing system of claim 9 , wherein segmenting the image data is performed using manual user selection.

15 . The computing system of claim 9 , wherein segmenting the image data is performed using an automatic process comprising one or more of adaptive thresholding, edge detection, or clustering techniques.

16 . A method for performing local demura corrections for processing display artifacts, the method comprising:
receiving image data; segmenting the image data into a plurality of regions of interest, wherein segmenting the image data is performed using an automatic process comprising one or more of adaptive thresholding, edge detection, or clustering techniques; applying a plurality of demura algorithms to the plurality of regions of interest to generate a plurality of corrected regions of interest by at least:
applying a first demura algorithm to a first region of interest; and
applying a second demura algorithm different from the first demura algorithm to a second region of interest; and
generating a corrected image using at least the plurality of corrected regions of interest.

17 . The method of claim 16 , further comprising:
determining whether the corrected image satisfies one or more predetermined criteria; and upon determining that the corrected image satisfies the one or more predetermined criteria, outputting demura parameters associated with the plurality of demura algorithms.

18 . The method of claim 17 , further comprising:
upon determining that the corrected image does not satisfy the one or more predetermined criteria:
adjusting demura parameters associated with the plurality of demura algorithms;
applying the plurality of demura algorithms to the plurality of regions of interest using the adjusted demura parameters to generate an updated plurality of corrected regions of interest; and
generating an updated corrected image using at least the updated plurality of corrected regions of interest.

19 . The method of claim 18 , wherein adjusting the demura parameters comprises adjusting a correction strength of at least one of the demura parameters.

20 . The method of claim 16 , wherein each of the p

Assignees

• Microsoft Technology Licensing Llc

Inventors

• Sun Ruipeng
• Pu Chuan
• Liao Wenjun

Classifications

• G09G2330/10

  Dealing with defective pixels · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2320/046

  Dealing with screen burn-in prevention or compensation of the effects thereof · CPC title

• G09G3/2092 Primary

  Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto (suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165) · CPC title