1. Canny J (1986) A computational approach to edge detection. IEEE Transactions on Pattern Analysis and Machine Vision, 8:679?698
2. Fischler M, Wolf H (1983) Linear delineation. In: Proceedings of the IEEE Conference on Computer Vision and Image Processing, Washington, D.C., pp. 351?356
3. Fua P, Hanson A (1988) Extracting generic shapes using model-driven optimization. In: Proceedings of the 1988 DARPA Image Understanding Workshop, Boston, Massachusetts, pp. 994?1004
4. Hanson AJ, Quam L (1988) Overview of the SRI cartographic modeling environment. In: Proceedings of the Image Understanding Workshop, Boston, Massachusetts, pp. 576?582
5. Haralick RM (1984) Digital step edges from zero crossings of second directional derivatives. IEEE Transactions on Pattern Analysis and Machine Vision 6:58?68