000 remove dotted line in opencv - smart1004/doc GitHub Wiki
https://stackoverflow.com/questions/29200472/opencv-detect-dotted-lines
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https://www.geeksforgeeks.org/line-detection-python-opencv-houghline-method/
how-to-connect-broken-lines-in-a-binary-image-using-python-opencv
https://stackoverflow.com/questions/43859750/how-to-connect-broken-lines-in-a-binary-image-using-python-opencv