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The original creator of the estimateAffine2D and estimateAffinePartial2D has acknowledge the bug where int inputs lead to the identity matrix output https://github.com/opencv/opencv/pull/8089
I am trying to use estimateAffinePartial2D in Python and I am erroneously getting the identity matrix output even with float inputs, but there may be more wrong and I'm not on the latest version with the fix for you problem above.
