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import numpy as np
import cv2 as cv
cap = cv.VideoCapture(cv.samples.findFile("vtest.avi"))
ret, frame1 = cap.read()
prvs = cv.cvtColor(frame1,cv.COLOR_BGR2GRAY)
hsv = np.zeros_like(frame1)
hsv[...,1] = 255
while(1):
ret, frame2 = cap.read()
next = cv.cvtColor(frame2,cv.COLOR_BGR2GRAY)
flow = cv.calcOpticalFlowFarneback(prvs,next, None, 0.5, 3, 15, 3, 5, 1.2, 0)
mag, ang = cv.cartToPolar(flow[...,0], flow[...,1])
hsv[...,0] = ang*180/np.pi/2
hsv[...,2] = cv.normalize(mag,None,0,255,cv.NORM_MINMAX)
bgr = cv.cvtColor(hsv,cv.COLOR_HSV2BGR)
cv.imshow('frame2',bgr)
k = cv.waitKey(30) & 0xff
if k == 27:
break
elif k == ord('s'):
cv.imwrite('opticalfb.png',frame2)
cv.imwrite('opticalhsv.png',bgr)
prvs = next
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