need help with Shape recognition and classification

2017 3 31
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更新时间：2017 12 29
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i used this code to highlight only signboard .
figure
I = imread('prj9.jpg');
pic=I(1:size(I,1)/2,1:size(I,2)/2,:);
for mm = 1:size(pic,1)
for nn = 1:size(pic,2)
if pic(mm,nn,1) < 80 || pic(mm,nn,2) > 80 || pic(mm,nn,3) > 100
gsc = 0.3*pic(mm,nn,1) + 0.59*pic(mm,nn,2) + 0.11*pic(mm,nn,3);
pic(mm,nn,:) = [gsc gsc gsc];
end
end
end
imshow(pic)
Now i need to classify differnt shapes such as circle,triangle,hexagon for efficiency purpose pls help with code

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