8000 Is it possible to access CuPy array directly within cuda_GpuMat? · Issue #818 · opencv/opencv-python · GitHub
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Is it possible to access CuPy array directly within cuda_GpuMat? #818

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amanda-peng opened this issue Mar 14, 2023 · 3 comments
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Is it possible to access CuPy array directly within cuda_GpuMat? #818

amanda-peng opened this issue Mar 14, 2023 · 3 comments
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@amanda-peng
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Is it possible to access CuPy array directly within cuda_GpuMat to support CudaArrayInterface?

Implemented a wrapper of CudaArrayInterface works fine to move GpuMat memory directly to CuPy. However, it failed with move from CuPy array to GpuMat.

Reference below link
rapidsai/cucim#329 (comment)

if initiated cuda_GpuMat with CuPy array pointer, the results is not as expected, it seems cv2.cuda_GpuMat calls some default allocator and does not use the passed pointer memory.

img_cv2_cu = cv2.cuda_GpuMat(img_cp.cuda_array_interface['shape'],
cv2.CV_8U, # or cv2.CV_8UC1
img_cp.cuda_array_interface['data'][0])

Is there anyone can help to check this ? any guidance on how to do this?
@asmorkalov
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Please use https://forum.opencv.org. It has larger audience for such questions.

@amanda-peng
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Thank you! Created a topic here
https://forum.opencv.org/t/is-it-possible-to-access-cupy-array-directly-within-cuda-gpumat/12404

@cudawarped cudawarped mentioned this issue Mar 17, 2023
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@amanda-peng
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Thank you! With this fix, I can create the GpuMat with the passed GPU memory pointer what as I expected.

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@asmorkalov @amanda-peng
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