I’ve just made a discovery, in IDLE if I type
help(cv2.FarnebackOpticalFlow)
it will return
Help on class FarnebackOpticalFlow in module cv2:
....
| Methods inherited from DenseOpticalFlow:
|
| calc(...)
| calc(I0, I1, flow) -> flow
| . @brief Calculates an optical flow.
| .
| . @param I0 first 8-bit single-channel input image.
| . @param I1 second input image of the same size and the same type as prev.
| . @param flow computed flow image that has the same size as prev and type CV_32FC2.
Next I typed
help(cv2.cuda_FarnebackOpticalFlow)
fully expecting that it will not work, but to my surprise it returned a result:
Help on class FarnebackOpticalFlow in module cv2.cuda:
...
| Methods inherited from DenseOpticalFlow:
|
| calc(...)
| calc(I0, I1, flow[, stream]) -> flow
| . @brief Calculates a dense optical flow.
| .
| . @param I0 first input image.
| . @param I1 second input image of the same size and the same type as I0.
| . @param flow computed flow image that has the same size as I0 and type CV_32FC2.
| . @param stream Stream for the asynchronous version.
So there is a distinct CUDA version of the Farneback Optical Flow on my Python, it has an extra ‘stream’ parameter
The help function in IDLE also exposes the rest of the classes in the cv2::cuda namespace in pyopencv_generated_types.h, as well as the functions listed under PyMethodDef methods_cuda[] in pyopencv_generated_modules_content.h
So the problem seems to be that Visual Studio Code’s stub file , __init__.pyi , has not been updated after repeated reinstalls of OpenCV-Python , and has been misleading by only showing the modules from my very first installation of OpenCV-Python before I embarked my attempt to enable CUDA