%?EXAMPLE?????GVF?snake?examples?on?two?simulated?object?boundaries.
%
%?NOTE:?
%?
%?traditional?snake?and?distance?snake?differed?from?GVF?snake?only?
%???by?using?different?external?force?field.?In?order?to?produce?the
%???corresponding?external?force?field?use?the?following?（all
%???assuming?edge?map?f?is?in?memory）.
%
%?traditional?snake:
%???f0?=?gaussianBlur（f1）;
%???[pxpy]?=?gradient（f0）;
%
%?distance?snake:
%???D?=?dt（f>0.5）;??%?distance?transform?（dt）?require?binary?edge?map
%???[pxpy]?=?gradient（-D）;
%
%?[pxpy]?is?the?external?force?field?in?both?cases
%
%?balloon?model?using?a?different?matlab?function?“snakedeform2“
%?instead?of?“snakedeform“.?The?external?force?could?be?any?force
%?field?generated?above.
%
%?an?example?of?using?it?is?as?follows
%???????[xy]?=?snakedeform2（xy?alpha?beta?gamma?kappa?kappap?pxpy2）;
%?do?a?“help?snakedeform2“?for?more?details
?

%???Chenyang?Xu?and?Jerry?Prince?6/17/97
%???Copyright?（c）?1996-97?by?Chenyang?Xu?and?Jerry?Prince

???cd?..;???s?=?cd;???s?=?[s?‘/snake‘];?path（s?path）;?cd?examples;
???
???help?gvf_ex;

???%?====?Example?1:?U-shape?object?====

???%?Read?in?the?64x64?U-shape?image
?????[Imap]?=?rawread（‘../images/U64.pgm‘）;??
?????
???%?Compute?its?edge?map
?????disp（‘?Compute?edge?map?...‘）;
?????f?=?1?-?I/255;?

???%?Compute?the?GVF?of?the?edge?map?f
?????disp（‘?Compute?GVF?...‘）;
?????[uv]?=?GVF（f?0.2?80）;?
?????disp（‘?Nomalizing?the?GVF?external?force?...‘）;
?????mag?=?sqrt（u.*u+v.*v）;
?????px?=?u./（mag+1e-10）;?py?=?v./（mag+1e-10）;?

??%?display?the?results
?????figure（1）;?
?????subplot（221）;?imdisp（I）;?title（‘test?image‘）;
?????subplot（222）;?imdisp（f）;?title（‘edge?map‘）;

?????%?display?the?gradient?of?the?edge?map
?????[fxfy]?=?gradient（f）;?
?????subplot（223）;?quiver（fxfy）;?
?????axis?off;?axis?equal;?axis?‘ij‘;?????%?fix?the?axis?
?????title（‘edge?map?gradient‘）;

?????%?display?the?GVF?
?????subplot（224）;?quiver（pxpy）;
?????axis?off;?axis?equal;?axis?‘ij‘;?????%?fix?the?axis?
?????title（‘normalized?GVF?field‘）;

???%?snake?deformation
?????disp（‘?Press?any?key?to?start?GVF?snake?deformation‘）;
?????pause;
?????subplot（221）;
?????image（（（1-f）+1）*40）;?
?????axis（‘square‘?‘off‘）;
?????colormap（gray（64））;?
?????t?=?0:0.05:6.28;
?????x?=?32?+?30*cos（t）;
?????y?=?32?+?30*sin（t）;
?????[xy]?=?snakeinterp（xy31）;?%?this?is?for?student?version
?????%?for?professional?version?use?
?????%???[xy]?=?snakeinterp（xy20.5）;

?????snakedisp（xy‘r‘）?
?????pause（1）;

?????for?i=1:25
???????[xy]?=?snakedeform（xy0.05010.6pxpy5）;
???????[xy]?=?snakeinterp（xy31）;?%?this?is?for?student?version
???????%?for?professional?version?use?
???????%???[xy]?=?snakeinterp（xy20.5）;
???????snakedisp（xy‘r‘）?
???????title（[‘Deformation?in?progress??iter?=?‘?num2str（i*5）]）
???????pause（0.5）;
???end

?????disp（‘?Press?any?key?to?display?the?final?result‘）;
?????pause;
?????cla;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????4963??1999-09-28?08:58??gvf_ex.m

????..AD...?????????0??2008-01-27?20:42??images

?????文件???????4109??1999-09-28?08:58??images\room.pgm

?????文件???????4109??1999-09-28?08:58??images\U64.pgm

?????文件????????298??1999-09-28?08:58??images\WS_FTP.LOG

????..AD...?????????0??2008-01-27?20:42??papers

?????文件????2073541??1999-09-28?08:58??papers\cvpr97.ps

?????文件????4148055??1999-09-28?08:58??papers\tip.ps

?????文件????????298??1999-09-28?08:58??papers\WS_FTP.LOG

????..AD...?????????0??2008-01-27?20:41??snake

?????文件????????916??1999-12-13?13:41??snake\BoundMirrorEnsure.m

?????文件????????699??1999-09-28?08:58??snake\BoundMirrorExpand.m

?????文件????????488??1999-09-28?08:58??snake\BoundMirrorShrink.m

?????文件???????1096??1999-09-28?08:58??snake\Contents.m

?????文件????????608??1999-09-28?08:58??snake\dt.m

?????文件????????500??1999-09-28?08:58??snake\gaussianBlur.m

?????文件????????255??1999-09-28?08:58??snake\gaussianMask.m

?????文件???????1637??1999-09-28?08:58??snake\GVF.m

?????文件????????252??1999-09-28?08:58??snake\imdisp.m

?????文件???????3256??1999-09-28?08:58??snake\rawread.m

?????文件???????1526??1999-09-28?08:58??snake\rawwrite.m

?????文件???????1501??1999-09-28?08:58??snake\snakedeform.m

?????文件???????1856??1999-09-28?08:58??snake\snakedeform2.m

?????文件????????551??1999-09-28?08:58??snake\snakedisp.m

?????文件????????190??1999-09-28?08:58??snake\snakeindex.m

?????文件????????894??1999-09-28?08:58??snake\snakeinit.m

?????文件???????1593??1999-09-28?08:58??snake\snakeinterp.m

?????文件???????1310??1999-09-28?08:58??snake\snakeinterp1.m

?????文件????????913??1999-09-28?08:58??snake\xconv2.m

?????目錄??????????0??2008-01-31?21:25??GVFSnake（matlab）

............此處省略34個文件信息