Method and apparatus for detecting pixel defect of optical module, and device

1. A method for detecting pixel defect of an optical module, comprising:

graying an image obtained by imaging a test binary image by an optical module in a darkroom environment to obtain a first grayscale image;

determining a first grayscale area and a second grayscale area corresponding to two gray levels in the test binary image from the first grayscale image;

determining a pixel point not matching a grayscale feature of respective grayscale region from the first grayscale area and the second grayscale area respectively as a pixel defect point; and

determining the pixel defect of the optical module according to the pixel defect point.

2. The method according to claim 1 , wherein the determining the pixel defect of the optical module according to the pixel defect point comprises:

locating a contour of a pixel defect area composed of the pixel defect point;

calculating an area and a center-of-mass coordinate of the pixel defect area according to the contour of a pixel defect area; and

determining the pixel defect of the optical module on a display screen of the optical module according to the area and the center-of-mass coordinate of the pixel defect area.

3. The method according to claim 1 , wherein the determining the first grayscale area and the second grayscale area corresponding to two gray levels in the test binary image from the first gray scale image comprises:

analyzing a grayscale distribution of the first grayscale image line by line;

determining a pixel point with a grayscale change greater than a set grayscale contrast as a boundary pixel point based on the grayscale distribution; and

dividing the first grayscale image into the first grayscale area and the second grayscale area according to the boundary pixel point.

4. The method according to claim 1 , wherein the test binary image comprises: a white pattern with a gray level of 1 and a black pattern with a gray level of 0;

the first grayscale area and the second grayscale area are image areas in the first grayscale image corresponding to the white pattern and the black pattern in the test binary image respectively.

5. The method according to claim 4 , wherein the determining the pixel point not matching the grayscale feature of respective grayscale region from the first grayscale area and the second grayscale area respectively as a pixel defect point comprises:

determining a pixel point with a grayscale value being less than a first set threshold value from the first grayscale area as a pixel point not matching the grayscale feature of the first grayscale area; and

determining a pixel point with a grayscale value being greater than a second set threshold value from the second grayscale area as a pixel point not matching the grayscale feature of the second grayscale area.

6. The method according to claim 4 , wherein the test binary image comprises: a first test binary image and a second test binary image; wherein,

in the first test binary image, the white pattern is a white rectangle being located at a center of the first test binary image, and the black pattern is a black rectangular frame wrapping around the white rectangle;

in the second test binary image, the black pattern is a black rectangle being located at a center of the second test binary image, and the white pattern is a white rectangular frame wrapping around the black rectangle.

7. The method according to claim 6 , wherein a proportion of the white rectangle in the first test binary image is not equal to a proportion of black rectangle in the second test binary image.

8. An apparatus for detecting pixel defect of an optical module, comprising:

an image collecting module, configured to gray an image obtained by imaging a test binary image by an optical module in a darkroom environment to obtain a first grayscale image;

a grayscale area dividing module, configured to determine a pixel point not matching a grayscale feature of respective grayscale region from the first grayscale area and the second grayscale area respectively as a pixel defect point;

a pixel defect point detecting module, configured to determine a pixel point not matching a grayscale feature of respective grayscale region from the first grayscale area and the second grayscale area respectively as a pixel defect point; and

a pixel defect determining module, configured to determine the pixel defect of the optical module according to the pixel defect point.

9. The apparatus according to claim 8 , wherein the pixel defect determining module is specifically configured to:

locate a contour of a pixel defect area composed of the pixel defect point;

calculate an area and a center-of-mass coordinate of the pixel defect area according to the contour of a pixel defect area; and

determine the pixel defect of the optical module on a display screen of the optical module according to the area and the center-of-mass coordinate of the pixel defect area.

10. An electronic device, comprising: a memory and a processor; wherein,

the memory is used to store at least one computer instruction;

the processor is coupled with the memory for executing the method according to claim 1 .

11. The method according to claim 2 , wherein the test binary image comprises: a white pattern with a gray level of 1 and a black pattern with a gray level of 0;

the first grayscale area and the second grayscale area are image areas in the first grayscale image corresponding to the white pattern and the black pattern in the test binary image respectively.

12. The method according to claim 3 , wherein the test binary image comprises: a white pattern with a gray level of 1 and a black pattern with a gray level of 0;

the first grayscale area and the second grayscale area are image areas in the first grayscale image corresponding to the white pattern and the black pattern in the test binary image respectively.

13. The apparatus according to claim 8 , wherein the grayscale area dividing module is specifically configured to:

analyze a grayscale distribution of the first grayscale image line by line;

determine a pixel point with a grayscale change greater than a set grayscale contrast as a boundary pixel point based on the grayscale distribution; and

divide the first grayscale image into the first grayscale area and the second grayscale area according to the boundary pixel point.

14. The apparatus according to claim 8 , wherein the test binary image includes: a white pattern with a gray level of 1 and a black pattern with a gray level of 0;

the first grayscale area and the second grayscale area are image areas in the first grayscale image corresponding to the white pattern and the black pattern in the test binary image respectively.

15. The apparatus according to claim 9 , wherein the test binary image includes: a white pattern with a gray level of 1 and a black pattern with a gray level of 0;

the first grayscale area and the second grayscale area are image areas in the first grayscale image corresponding to the white pattern and the black pattern in the test binary image respectively.

16. The apparatus according to claim 14 , wherein the test binary image includes: a white pattern with a gray level of 1 and a black pattern with a gray level of 0;

the first grayscale area and the second grayscale area are image areas in the first grayscale image corresponding to the white pattern and the black pattern in the test binary image respectively.

17. The apparatus according to claim 14 , wherein the pixel defect point detecting module is specifically configured to:

determine a pixel point with a grayscale value being less than a first set threshold value from the first grayscale area as a pixel point not matching the grayscale feature of the first grayscale area; and

determine a pixel point with a grayscale value being greater than a second set threshold value from the second grayscale area as a pixel point not matching the grayscale feature of the second grayscale area.

18. The apparatus according to claim 14 , wherein the test binary image includes: a first test binary image and a second test binary image; wherein,

in the first test binary image, the white pattern is a white rectangle being located at a center of the first test binary image, and the black pattern is a black rectangular frame wrapping around the white rectangle;

in the second test binary image, the black pattern is a black rectangle being located at a center of the second test binary image, and the white pattern is a white rectangular frame wrapping around the black rectangle.

19. The apparatus according to claim 18 , wherein a proportion of the white rectangle in the first test binary image is not equal to a proportion of black rectangle in the second test binary image.