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中文说明：蛇形算法，用于提取物体的轮廓，对于一般的图形（只要边缘的角度不大于90度）识别率还是很高的。
English Description：
Snake algorithm, which is used to extract the contour of objects, has a high recognition rate for general graphics (as long as the angle of the edge is not greater than 90 degrees).snake_demo
..........\images
..........\......\chest.pgm
..........\......\heart.mat
..........\......\heart.pgm
..........\......\heart2.mat
..........\......\heart3.mat
..........\......\new.pgm
..........\......\room.mat
..........\......\room.pgm
..........\......\room2.mat
..........\......\room3.mat
..........\......\u64.mat
..........\......\U64.pgm
..........\......\u642.mat
..........\sdemo.m
..........\snake
..........\.....\BoundMirrorEnsure.m
..........\.....\BoundMirrorExpand.m
..........\.....\BoundMirrorShrink.m
..........\.....\Contents.m
..........\.....\dt.m
..........\.....\gaussianBlur.m
..........\.....\gaussianMask.m
..........\.....\GGVF.m
..........\.....\GVF.m
..........\.....\imdisp.m
..........\.....\rawread.m
..........\.....\rawwrite.m
..........\.....\snakedeform.m
..........\.....\snakedeform2.m
..........\.....\snakedisp.m
..........\.....\snakeindex.m
..........\.....\snakeinit.m
..........\.....\snakeinterp.m
..........\.....\snakeinterp1.m
..........\.....\xconv2.m
..........\subf
..........\....\caclVF.m
..........\....\CallBackHelpSlider.m
..........\....\closeapl.m
..........\....\gradient2.m
..........\....\iterset.m
..........\....\iterset2.m
..........\....\menu0.m
..........\....\menu1.m
..........\....\menu2.m
..........\....\menu3.m
..........\....\muset.m
..........\....\RadioUPDATE.m
..........\....\sigmaset.m
..........\....\SnakeIter.m
..........\....\snakeset.m
..........\....\WriteHelp.m