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Nice spot by @supra56. CUDA looks to be installed properly, you are just passing the wrong arguments and not using autocomplete for function names.

GpuMat should be working fine, you just have a typo (always best to use autocomplete), it should be

cv2.cuda_GpuMat()

not

cv2.cuda_GpuMAT()

I think the second problem is that you are passing a numpy array instead of a GpuMat to resize. Some cuda functions may accept numpy arrays but I would advise against it and always pass GpuMat unless the function explicitly requires a numpy array. All that said all the below should work

cuMat = cv2.cuda_GpuMat(npMat)
q = cv2.cuda.resize(cuMat,dsize=(100,100))

or

q=cv2.cuda.resize(cv2.cuda_GpuMat(npMat),dsize=(100,100))

or

q = cv2.cuda_GpuMat((100,100),cuMat.type())
cv2.cuda.resize(cv2.cuda_GpuMat(npMat),(100,100),q)

I would suggest the last one because it avoids allocating the return matrix on each invocation, so it will be much much faster, which you can verify by comparing

%timeit cv2.cuda.resize(cuMat,(100,100))
%timeit cv2.cuda.resize(cuMat,(100,100),q)

Nice spot by @supra56. CUDA looks to be installed properly, you are just passing the wrong arguments and not using autocomplete for function names.

GpuMat should be working fine, you just have a typo (always best to use autocomplete), it should be

cv2.cuda_GpuMat()

not

cv2.cuda_GpuMAT()

I think the second problem is that you are passing a numpy array instead of a GpuMat to resize. Some cuda functions may accept numpy arrays but I would advise against it and always pass GpuMat unless the function explicitly requires a numpy array. All that said all the below should work

cuMat = cv2.cuda_GpuMat(npMat)
q = cv2.cuda.resize(cuMat,dsize=(100,100))

or

q=cv2.cuda.resize(cv2.cuda_GpuMat(npMat),dsize=(100,100))

or

q = cv2.cuda_GpuMat((100,100),cuMat.type())
cv2.cuda.resize(cv2.cuda_GpuMat(npMat),(100,100),q)
cv2.cuda.resize(cuMat,(100,100),q)

I would suggest the last one because it avoids allocating the return matrix on each invocation, so it will be much much faster, which you can verify by comparing

%timeit cv2.cuda.resize(cuMat,(100,100))
%timeit cv2.cuda.resize(cuMat,(100,100),q)