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Edge operators are based on estimating derivatives.While first derivatives show approximately where the edges are, zero crossings of second derivatives were shown to be better.Ignoring that entirely, Canny developed his own edge detector that everyone uses now.After finding good edges, we have to group them into lines, circles, curves, etc. to use further.The Hough transform for circles works well, but for lines the performance can be poor. The Burns operator or some tracking operators (old ORT pkg) work better.