Meter-Reading
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Using with OpenCV v4.2
On OpenCV 4.0 or later version, findContours()
return 2 values.
https://docs.opencv.org/4.3.0/d3/dc0/group__imgproc__shape.html#gadf1ad6a0b82947fa1fe3c3d497f260e0
I fixed codes below.
# BEFORE
image, contours, hierarchy = cv2.findContours(mask, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
# AFTER
contours, hierarchy = cv2.findContours(mask, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)