function?[xytc]=bdry_extract_3（V）;
%?[xytc]=bdry_extract_3（V）;
%?compute?（rtheta）?histograms?for?points?along?boundary?of?single?
%?region?in?binary?image?V?

%?extract?a?set?of?boundary?points?w/oriented?tangents
%sig=1;
%Vg=gauss_sig（Vsig）;
Vg=V;?%?if?no?smoothing?is?needed
c=contourc（Vg[.5?.5]）;
[G1G2]=gradient（Vg）;

%?need?to?deal?with?multiple?contours?（for?objects?with?holes）
fz=c（1:）~=0.5;
c（:find（~fz））=NaN;
B=c（:find（fz））;

npts=size（B2）;
t=zeros（npts1）;
for?n=1:npts
???x0=round（B（1n））;
???y0=round（B（2n））;
???t（n）=atan2（G2（y0x0）G1（y0x0））+pi/2;
end

x=B（1:）‘;
y=B（2:）‘;

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

?????文件?????965316??2005-06-13?09:29??shapecontext\2002shapematch-Belongie-Pami-ByContext.pdf

?????文件????????634??2000-09-04?23:51??shapecontext\bdry_extract_3.m

?????文件????????659??2000-09-04?20:28??shapecontext\bookstein.m

?????文件??????23891??2008-03-21?14:28??shapecontext\box1_5_coress.eps

?????文件??????34883??2008-03-21?14:28??shapecontext\box1_5_coress.fig

?????文件??????33970??2008-03-21?14:28??shapecontext\box1_5_trans.eps

?????文件??????18075??2008-03-21?14:28??shapecontext\box1_5_trans.fig

?????文件??????24026??2008-03-21?14:29??shapecontext\box1_9_coress.eps

?????文件??????35217??2008-03-21?14:29??shapecontext\box1_9_coress.fig

?????文件??????33929??2008-03-21?14:29??shapecontext\box1_9_trans.eps

?????文件??????18044??2008-03-21?14:29??shapecontext\box1_9_trans.fig

?????文件???????1154??2011-11-14?16:27??shapecontext\demo_1.m

?????文件???????1155??2000-09-05?15:00??shapecontext\demo_1.m~

?????文件???????8879??2000-09-25?21:16??shapecontext\demo_2.m

?????文件???????8879??2000-09-08?19:55??shapecontext\demo_2.m~

?????文件?????627576??2000-09-05?00:08??shapecontext\digit_100_train_easy.mat

?????文件?????627576??2000-09-05?00:08??shapecontext\digit_100_train_hard.mat

?????文件????????820??2000-09-04?20:26??shapecontext\dist2.m

?????文件????????115??2000-09-04?23:26??shapecontext\gaussker.m

?????文件????????577??2000-09-04?23:26??shapecontext\get_samples_1.m

?????文件????????432??2000-09-04?20:27??shapecontext\hist_cost_2.m

?????文件??????11250??2000-09-04?20:28??shapecontext\hungarian.m

?????文件????????335??2000-09-04?23:26??shapecontext\im.m

?????文件?????????96??2008-03-21?14:28??shapecontext\main_box.m

?????文件???????1153??2008-03-21?14:25??shapecontext\main_shapecontext.m

?????文件????????874??2000-09-05?15:25??shapecontext\README

?????文件???????7288??2000-09-05?00:28??shapecontext\save_fish_def_3_1.mat

?????文件???????7288??2000-09-05?00:28??shapecontext\save_fish_noise_3_2.mat

?????文件???????8856??2000-09-05?00:28??shapecontext\save_fish_outlier_3_2.mat

?????文件???????1963??2000-09-05?15:20??shapecontext\sc_compute.m

............此處省略6個文件信息