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Hi,

If you have managed to use gpu::HoughLines, you should be able to use gpu::HoughCircles.

It seems for me at first sight that you just have to supply the correct arguments like for gpu::HoughLines or you should be more explicit on what you cannot do: convert an image to grayscale ?, load a cv::Mat to cv::GpuMat ?, the correct values for the arguments ?, how to get / display the result ?, etc.

For the cpu version of cv::HoughCircles, the corresponding tutorial.