29 lines
918 B
Python
29 lines
918 B
Python
import numpy as np
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import cv2 as cv
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cap = cv.VideoCapture(cv.samples.findFile('data/production_id 4525346 (1080p).mp4'))
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ret, frame1 = cap.read()
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prvs = cv.cvtColor(frame1, cv.COLOR_BGR2GRAY)
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hsv = np.zeros_like(frame1)
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hsv[..., 1] = 255
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while(1):
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ret, frame2 = cap.read()
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if not ret:
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print('No frames grabbed!')
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break
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next = cv.cvtColor(frame2, cv.COLOR_BGR2GRAY)
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flow = cv.calcOpticalFlowFarneback(prvs, next, None, 0.5, 3, 15, 3, 5, 1.2, 0)
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mag, ang = cv.cartToPolar(flow[..., 0], flow[..., 1])
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hsv[..., 0] = ang*180/np.pi/2
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hsv[..., 2] = cv.normalize(mag, None, 0, 255, cv.NORM_MINMAX)
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bgr = cv.cvtColor(hsv, cv.COLOR_HSV2BGR)
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cv.imshow('frame2', bgr)
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k = cv.waitKey(30) & 0xff
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if k == 27:
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break
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elif k == ord('s'):
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cv.imwrite('opticalfb.png', frame2)
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cv.imwrite('opticalhsv.png', bgr)
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prvs = next
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cv.destroyAllWindows() |