ogn-52-fiducial-marker-dete.../examples/threshold.py

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import cv2
cap = cv2.VideoCapture(2)
cap.set(cv2.CAP_PROP_FRAME_WIDTH, 640)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 480)
while True:
_, frame = cap.read()
grey = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
_, thresh = cv2.threshold(grey, 127, 255, cv2.THRESH_BINARY)
cv2.imshow('original', frame)
cv2.imshow('thresh', thresh)
cv2.waitKey(1)