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Issue No.01 - January (1981 vol.3)
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|).
Azriel Rosenfeld, "The Max Roberts Operator is a Hueckel-Type Edge Detector", IEEE Transactions on Pattern Analysis & Machine Intelligence, vol.3, no. 1, pp. 101-103, January 1981, doi:10.1109/TPAMI.1981.4767056
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