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Rather playing with the parameters of Canny Edge Detection use adaptive Canny Edge Detector. It will give a far better result. Adaptive Canny works on finding median over the image and uses that value for upper and lower threshold. You can go through this documentation:- Zero Parameter Auto Canny Detection://www.pyimagesearch.com/2015/04/06/zero-parameter-automatic-canny-edge-detection-with-python-and-opencv/) I think this will help you find better edges.
