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Issue No. 01 - January (1983 vol. 5)
ISSN: 0162-8828
pp: 48-54
Alan H. Feiveson , NASA Johnson Space Center, Houston, TX 77058.
A procedure is given which substantially reduces the processing time needed to perform maximum likelihood classification on large data sets. The given method uses a set of fixed thresholds which, if exceeded by one probability density function, makes it unnecessary to evaluate a competing density function. Proofs are given of the existence and optimality of these thresholds for the class of continuous, unimodal, and quasi-concave density functions (which includes the multivariate normal), and a method for computing the thresholds is provided for the specifilc case of multivariate normal densities. An example with remote sensing data consisting of some 20 000 observations of four-dimensional data from nine ground-cover classes shows that by using thresholds, one could cut the processing time almost in half.

A. H. Feiveson, "Classification by Thresholding," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 5, no. , pp. 48-54, 1983.
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