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In OpenCV 3.0-dev, user can decide the behavior of UMat by cv::ocl::setUseOpenCL().
cv::ocl::setUseOpenCL(true); // enable OpenCL in the processing of UMat
cv::ocl::setUseOpenCL(false); // disable OpenCL in the processing of UMat
And, you need to include the following header to use this function.
#include <opencv2/core/ocl.hpp>