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Issue No. 01 - January (1981 vol. 3)
ISSN: 0162-8828
pp: 101-103
Azriel Rosenfeld , Computer Science Center, University of Maryland, College Park, MD 20742.
Hueckel's 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. A very simple case of this approach uses a 2 - 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 CD turns out to be the Roberts operator max (|A - D|, |B - C|).

A. Rosenfeld, "The Max Roberts Operator is a Hueckel-Type Edge Detector," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 3, no. , pp. 101-103, 1981.
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