Method and device for marking image position of sub-pixel of display screen, and storage medium

A method for marking an image position of a sub-pixel of a display screen, comprising:

• obtaining an original image of the sub-pixel of the display screen that has been taken, and performing average filtering and binarization processing on the original image of the sub-pixel to obtain a first image with noise removed;
• performing a first local threshold segmentation on the original sub-pixel image to obtain a second image with an interference pixel removed;
• the interference pixel comprising at least one of a dust-covered point and a defective pixel point;
• performing a first convolution operation and a second local threshold segmentation on the original image of the sub-pixel to obtain a third image with specific morphological characteristics;
• performing a second convolution operation and a third local threshold segmentation on the original image of the sub-pixel to obtain a fourth image with specific morphological characteristics;
• performing a second convolution operation and a local maximum mark on the original image of the sub-pixel to obtain a fifth image;
• performing an intersection operation on the first image, the second image, the third image, and the fourth image to obtain an intermediate image with specific morphological characteristics that removes noise and the interference pixel;
• performing an intersection operation on the intermediate image and the fifth image to obtain a sub-pixel mark map that comprises all sub-pixel bright points;
• searching for points to be filled among adjacent points of the bright point of each sub-pixel in the sub-pixel mark map according to a first direction pixel pitch and a second direction pixel pitch in the original image of the sub-pixel, filling the points to be filled until the points to be filled do not exist in the original image of the sub-pixel, to obtain a filling mark map;
• and
• obtaining a target sub-pixel mark map based on the sub-pixel mark map and the filling mark map.