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OpenCV 2.4.10 CPU HoughCircles retrieves different results compared with gpu::HoughCircles on my sample scenario. Using exactly the same parameters the CPU variant retrieves 1 circle but the GPU variant 5 circles (all with the same center but different radius).

The used parameters are: method = CV_HOUGH_GRADIENT; dp = 1.0; minDist = 48; cannyThreshold = 46; votesThreshold = 54; minRadius = 36; maxRadius = 60;

C:\fakepath\CircleData.png

What I'm doing wrong?