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Sorry I noticed this question too late. I strongly believe the following Q&A helps your agony. http://answers.opencv.org/question/189154/using-opencv-in-mfc-cause-memory-leak

opencv indeed allocates some static buffers for mutexes, random pools, etc, which never are freed (tha's the os'es job)

this architecture was employed since ver.3. I believe it is the case for you.