Image analysis – Histogram processing – For setting a threshold
Patent
1983-03-18
1985-11-12
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
364752, 382 41, G06K 946
Patent
active
045532605
ABSTRACT:
Means and methods are provided for processing the quantity Si which corresponds to a point i in space where Si=(Xi.sup.2 +Yi.sup.2).sup.1/2 and Xi and Yi are quantities lying along mutually orthogonal axes in the space. Si is approximated by the expression A.vertline.Xi.vertline.+B.vertline.Yi.vertline. where A and B are constant coefficients selected to minimize the error in value of Si according to a selected error computation. A and B can be approximated as a binary power series with each series including a preselected number of terms. Another embodiment does not require means for approximating A and B as binary power series, but segments the coordinate space into m sectors and computes and Am and Bm for each of said m sectors. A particularly advantageous application of the invention is its use in a device and method for processing edge data concerning an edge in an optical image where Si is the Sobel, Prewitt or Roberts square root edge operators.
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I. E. Abdou, et al., "Fast Nearest-Neighbor 2-Dimensional Interpolation Method for Imaging Devices of Dissimilar Resolution", IBM Technical Disclosure Bulletin, vol. 22, No. 4, Sep. 1979.
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R. A. Duda, et al., Pattern Classification and Scene Analysis, Wiley, New York, 1973.
Belt Ronald A.
Joseph James D.
Boudreau Leo H.
Honeywell Inc.
Udseth William T.
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