CODEWITHSUNDEEP
pythonopencvopenclopencv3.0
Rui Martins
Rui Martins

Reputation: 3868

Python and T-API on OpenCV

OpenCV 3.0 now uses T-API (Transparent API), see:

https://github.com/Itseez/opencv/wiki/Opencv3

it does not need to specify cv::ocl::Canny, cv::gpu::Canny etc; cv::Canny just works on both CPU and GPU.

And this is an example:

http://www.learnopencv.com/opencv-transparent-api/

My question is:

This works with OpenCV with Python? Can anyone give me an example?

Upvotes: 2

Views: 2883

Answers (1)

Polar Nick
Polar Nick

Reputation: 75

In C++ to use OpenCL implementations of methods - you should pass UMat instead of Mat, when you call method from Python with numpy array or so - you effectively call it with Mat as argument.

UMat was adopted for Python bindings since OpenCV 3.2. Now you can pass cv2.UMat(someNumpyMat) to function just like in C++.

Example:

ps, descs_umat = orb.detectAndCompute(cv2.UMat(img), None)
descs = descs_umat.get()
matcher = cv2.BFMatcher(cv2.NORM_HAMMING, crossCheck=True)
res = matcher.match(descs_umat, descs_umat)

Upvotes: 4

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