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Vadim Pisarevsky authored
* improved version of HoughCircles (HOUGH_GRADIENT_ALT method) * trying to fix build problems on Windows * fixed typo * * fixed warnings on Windows * make use of param2. make it minCos2 (minimal value of squared cosine between the gradient at the pixel edge and the vector connecting it with circle center). with minCos2=0.85 we can detect some more eyes :) * * added description of HOUGH_GRADIENT_ALT * cleaned up the implementation; added comments, replaced built-in numeic constants with symbolic constants * rewrote circle_popcount() to use built-in popcount() if possible * modified some of HoughCircles tests to use method parameter instead of the built-in loop * fixed warnings on Windows
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