The Simplest 'Hueckel' Edge Detector is a Roberts Operator
MARYLAND UNIV COLLEGE PARK COMPUTER SCIENCE CENTER
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Hueckels edge detector finds the best-fitting ideal step edge to a given picture neighborhood, by expanding the neighborhood and step edge in terms of a set of nine basis functions. The simplest case of this approach uses a 2- by-2 neighborhood and three basis functions. This case is solved explicitly using elementary methods. The magnitude of the best-fitting step edge for the neighborhood AB over CD turns out to be the Roberts operator max abs. val. A- D, abs. val. B-C.
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