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Currently, the Canny operator is most commonly used, followed by Marr-Hildreth. Very many operators have been published but so far none have any significant advantage over the Canny operator in general situations. Work on multi-scale techniques is still very much in the labs.
Recently an edge detector were published, which allows edge extraction with sub-pixel precision. It combines advantages of 1st and 2nd ordered edge
@article{steger1998,
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