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????????634??2000-09-05?11:51??sc_demo\bdry_extract_3.m

?????文件????????659??2000-09-05?08:28??sc_demo\bookstein.m

?????文件???????1155??2000-09-08?08:31??sc_demo\demo_1.m

?????文件???????1155??2000-09-06?03:00??sc_demo\demo_1.m~

?????文件???????8879??2000-09-26?09:16??sc_demo\demo_2.m

?????文件???????8879??2000-09-09?07:55??sc_demo\demo_2.m~

?????文件?????627576??2000-09-05?12:08??sc_demo\digit_100_train_easy.mat

?????文件?????627576??2000-09-05?12:08??sc_demo\digit_100_train_hard.mat

?????文件????????820??2000-09-05?08:26??sc_demo\dist2.m

?????文件????????115??2000-09-05?11:26??sc_demo\gaussker.m

?????文件????????577??2000-09-05?11:26??sc_demo\get_samples_1.m

?????文件????????432??2000-09-05?08:27??sc_demo\hist_cost_2.m

?????文件??????11250??2000-09-05?08:28??sc_demo\hungarian.m

?????文件????????335??2000-09-05?11:26??sc_demo\im.m

?????文件????????874??2000-09-06?03:25??sc_demo\README

?????文件???????7288??2000-09-05?12:28??sc_demo\save_fish_def_3_1.mat

?????文件???????7288??2000-09-05?12:28??sc_demo\save_fish_noise_3_2.mat

?????文件???????8856??2000-09-05?12:28??sc_demo\save_fish_outlier_3_2.mat

?????文件???????1963??2000-09-06?03:20??sc_demo\sc_compute.m

?????文件???????4810??2000-09-26?09:16??sc_demo\tps_iter_match_1.m

?????文件???????4810??2000-09-26?09:14??sc_demo\tps_iter_match_1.m~

?????文件?????????33??2008-12-29?18:53??sc_demo\由shape?context的提出者所寫的代碼.txt

?????目錄??????????0??2009-02-18?15:45??sc_demo

-----------?---------??----------?-----??----

??????????????1325964????????????????????23