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How to detect concentric squares?

I have vector of approximated 4-point closed contours. How I can determine that some of that are concentric?

How to detect concentric squares?

I have vector of approximated 4-point closed contours. How I can determine that some of that them are concentric?

How to detect concentric squares?

I have vector of approximated 4-point closed contours. How I can determine that some of them are concentric?concentric? image description