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I wish to interface OpenCV with Cuda. By this, I mean:

• given a T* pointer on a GPU memory block allocated with cudaMalloc, how create an OpenCV GpuMat using this allocation (without copy, and later losing my block when the GpuMat object is destroyed).
• given a GpuMat object, how to get the associated device pointer usable by cuda (seems from a previous answer that the ptr<> method can do this).

Thanks for your help.

Note: cuda5 is now able to compile the gpumat.hpp header.