1. On edge detection;Torre;IEEE Transactions on Pattern Analysis and Machine Intelligence,1984
2. A geometric approach to edge detection;Bezdek;IEEE Transactions on Fuzzy Systems,1998
3. Image filtering, edge detection, and edge tracing using fuzzy reasoning;Law;IEEE Transactions on Pattern Analysis and Machine Intelligence,1996
4. FIRE operators for image processing;Russo;Fuzzy Sets and Systems,1999
5. I. Sobel, G. Feldman, A 3×3 isotropic gradient operator for image processing, Presented at a talk at the Stanford Artificial Intelligence Project, 1968.