“…Among the most notable statistical classification algorithms are those proposed by Fukunaga and Koontz (1970), Foley and Sammon (1975), and the Hotelling trace algorithm (Fukunaga, 1972), all of which have been used in image-classification schemes Lee, 1982a, 1982b;Gu and Lee, 1984;Casasent and Sharma, 1984;Wu and Stark, 1985;Wernick and Morris, 1986). A broader interpretation of image classification reveals that image recognition in realistic environments is always, in fact, a sorting problem.…”