Edge detection algorithm in image processing based on point-by-point threshold segmentation

A new segmentation algorithm in which each pixel in the image has its own threshold is proposed. The threshold of a pixel in an image is estimated by calculating the mean of the grayscale values of the neighborhood pixels of the pixel, and the square deviation of the grayscale values of the neighborhood pixels is also calculated as an additional judge condition, so that the result of the proposed algorithm is the edge of the image. Experimental results demonstrate that the proposed algorithm could get the precise edge of the image, while it is reasonable to estimate the threshold of a pixel through the statistic information of its neighborhood pixels.