TypeError

[Zumbalamambo]

Im getting the following error in this line
flow = cv2.calcOpticalFlowFarneback(prevgray, gray, 0.5, 5, 15, 3, 5, 1.1, cv2.OPTFLOW_FARNEBACK_GAUSSIAN)

Error:
flow = cv2.calcOpticalFlowFarneback(prevgray, gray, 0.5, 5, 15, 3, 5, 1.1, cv2.OPTFLOW_FARNEBACK_GAUSSIAN)
TypeError: integer argument expected, got float

[JosephRedfern]

This is probably because you're using OpenCV 3, which has changed the arguments to calcOpticalFlowFarneback (as I just discovered). I've written a hacky patch to fix this issue, you can check it out here: https://github.com/JosephRedfern/Python-optical-flow-tracking/tree/py3-ocv3

[JosephRedfern]

Oh, infact, there is an official CV3 compatible demo here: https://raw.githubusercontent.com/opencv/opencv/master/samples/python/opt_flow.py.

[3073]

how can I tell direction of motion using opticalflow?