3[2]Martelli A. An application of heuristic search methods to edge and contour detection[J]. Communs ACM, 1976,19(1):73~83.
4[3]Law T, Itoh H, Seki H. Image filtering,edge detection,and edge tracing using fuzzy reasoning[J]. IEEE Trans. Pattern Analysis and Machine Intelligence, 1996,18(5) :220~227.
5[4]Farag A A, Delp E J. Edge linking by sequential search[J].Pattern Recognition, 1995,28 (5): 611~633.
6[5]Ashkar G, Modestino J. The contour extraction problem with biomedical applications [J]. Comput. Graphics Image Process,1978,7(6) :331~355.
7[6]Eichel P H, Delp E J, Koral K et al. A method for fully automatic detection of coronary arterial edges for cineangiograms [J]. IEEE Trans. Medical Image. 1988,12(5) :313~320.