Contour Feature Point Detection Algorithm of CCD Image

The image is segmented to Bi-value image with max variance algorithm, and then the edge is detected by a series of image morphology algorithm including grads, thinning and cutting. The eleven point curvature-computing method is used to locate the area of corner and point of tangency. An improved algorithm based on least square fitting is given to search corner and point of tangency. This algorithm is applied to the cutting tools measurement system based on image processing and the actual result proves it has a good noise-resisted performance and can detect feature points accurately.