Automatic adjustment method for optimizing exposure brightness

The invention relates to an automatic adjustment method for optimizing exposure brightness. The method comprises the following steps: S1, teaching and reading a standard image; s2, measuring and taking an image; s3, comparing and calculating, and calculating an average gray scale difference ratio and a gray scale deviation difference ratio of the two images; s4, interpretation: the system interprets whether the average gray scale difference value ratio and the gray scale deviation difference value ratio are in a preset value range; and S5, adjusting the exposure time, measuring and taking images again, comparing, calculating and interpreting. According to the method, the average gray scale and the gray scale deviation of a group of standard images are used as calibration standards of subsequent measurement images, and measurement image taking, comparison calculation and interpretation are repeated, so that the exposure time of an image system is automatically and quickly adjusted, a measurement image with the