Can't find convex quadrilaterals

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Who Im
Who Im on 27 Feb 2015
I need to find centers of markers on this photo(now I need only circles-in-square markers).
Using Local Adaptive Thresholding I found contours. But don't know how to find quadrilaterals. Advise article, commands, links. Anything. Please!
P.S. Sorry for my English. I'm Russian.

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