SIZE DETECTION METHOD FOR PITTING SURFACE DFECTS WITH DUE ACCOUNT FOR CLOSED AREAS

摘要

A size detection method for pitting-like surface defects with due account for closed areas includes picture image analysis according to which with the help of image segmentation they determine areas corresponding to sample defects. On the image segmentation wit the help of multiple-level threshold discrimination they isolate areas corresponding to open defect areas as well as they take into account little informative areas around open defects which along with open defects are extracted by means of division of this image into fragments for each of them they build a local intensity histogram and separate local maximums on it where they form intensity clusters and find their centers. The set value of image segmentation thresholds is selected equal to the mean value of two adjacent cluster centers.