cv2 optflow attributes part of main module in newest version

[RubenImhoff]

Hi Georgy,

I found out that in the latest version(s) of cv2, the creatOptFlow attributes are no longer part of cv2.optflow, but of the main branch of cv2, so:

    # calculate dense flow
    if method == "Farneback":
        of_instance = cv2.optflow.createOptFlow_Farneback()
    elif method == "DIS":
        of_instance = cv2.optflow.createOptFlow_DIS()
    elif method == "DeepFlow":
        of_instance = cv2.optflow.createOptFlow_DeepFlow()
    elif method == "PCAFlow":
        of_instance = cv2.optflow.createOptFlow_PCAFlow()
    elif method == "SimpleFlow":
        of_instance = cv2.optflow.createOptFlow_SimpleFlow()
    elif method == "SparseToDense":
        of_instance = cv2.optflow.createOptFlow_SparseToDense()

will become (e.g.):

    # calculate dense flow
    elif method == "DIS":
        of_instance = cv2.DISOpticalFlow_create()

For robustness, perhaps an idea to check for the cv2-version and adjust this part of the code to that?

[hydrogo]

Hi @RubenImhoff,
Thanks for pointing that out. I will definitely do that in the next release (sad frog).
At the moment, rainymotion explicitly requires OpenCV of version 3.4.* (in .yml file). I hope this solution will work further until a more elegant solution comes.

All the best,
Georgy