How to find intersection point

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

Answer 1

[Matt J]

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),

[Ezdihar]

Yes, Thanks a lot :)