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- import cv2
- cv2.namedWindow("preview")
- vc = cv2.VideoCapture(0)
- if vc.isOpened(): # try to get the first frame
- rval, frame = vc.read()
- else:
- rval = False
- while rval:
- cv2.imshow("preview", frame)
- rval, frame = vc.read()
- key = cv2.waitKey(20)
- if key == 27: # exit on ESC
- break
- else:
- cv2.line(img=frame, pt1=(700,5), pt2=(5, 450), color=(255, 0, 0), thickness=1, lineType=8, shift=0)
- vc.release()
- cv2.destroyWindow("preview")
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