EDGES

Sobel 3x3 edge masks:

X derivative
-101
-202
-101

Y derivative
-1-2-1
000
121


J. Canny, Finding edges and lines in images, Tech. Rep. 720, MIT, Artificial Intelligence Lab., 1983
J. Canny, A computational approach to edge detection, IEEE Trans. Pattern An. Machine Intell. 8, 1986, 679-698


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