Apply the Canny edge detector to image class.png. To compute Canny edges: help edge edge(im,'canny',[thres1 thres2],sigma) (i) Compute edges for sigma=2. (ii) Select thresholds thes1 and thres2 which give the best edge image without noise. (thres1 (iii) Repeat the experiment for sigma=0.5. How does the output depend on the scale and the thresholds?
What are the main operations in canny detector?