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I recommend you to use cv::InputArray, cv::OutputArray and cv::InputOutputArray (link) instead of cv::Mat&.
Its much more flexible. In OpenCV 3.0 you can pass cv::Mat, std::vector, cv::UMat and even cv::cuda::GpuMat with it.
You can pass through cv::InputArray into OpenCV functions, where OpenCLwill be used, if available (cv::UMat).
And in my oppinion its cleaner to code with. You can take a look in the source code to learn how to use it.
