How to find intersection point

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Ezdihar
Ezdihar 2013-6-29
Hi, I have an image with 4 colors.
http://picturepush.com/public/13438199
I want to find the intersection points between four colors. How can I do that?
Thanks

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Matt J
Matt J 2013-6-29
编辑：Matt J 2013-6-29
Maybe as follows,
A=imdilate(img==color1, ones(3));
B=imdilate(img==color2, ones(3));
C=imdilate(img==color3, ones(3));
D=imdilate(img==color4, ones(3));
S=regionprops(A & B & C & D,'Centroid');
locations=vertcat(S.Centroid),

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