[1] Kass M,Witkin A,Terzopoulos D. Snake: Active Contour Models [J]. International Journal of Computer Vision (S0920-5691),1987,8: 321-331.
[2] Xu C,Prince P L. Snakes Shapes and Gradient Vector Flow [J]. IEEE Trans. on Image Processing(S1057-7149),1998,7: 359-369.
[3] Cohen L D. On Active Contour Models and Balloons [J]. CVGIP(S1049-9660),1991,53(2): 211-218.
[4] Terzopoulos D. Matching Deformable Models to Images Technical Digest Series [C]// Topical Meeting in Machine Vision, Incline Village,Nevada,1987,12: 160-163.
[5] Amini a,Tehrani S,Whemouth T. Using dynamic programming for minimizing the energy of active contours in the presence of hard constraints [C]// Second International Conference on Computer Vision,Dec 5-8,1988: 95-99.
[6] Osher S,Rudin I J.Feature-oriented Image Enhancement Using Shock Filters [J].SIAM J Num Analysis(S1095-7170),1990,27: 919-940.