Issue No. 02 - February (1987 vol. 9)
Ian D. Longstaff , Royal Signals and Radar Establishment (RSRE), Malvern WR14 3PS, England; Western Australia Institute of Technology, Perth, Western Australia.
This correspondence describes extensions to Fisher's linear discriminant function which allow both differences in class means and covariances to be systematically included in a process for feature reduction. It is shown how the Fukunaga-Koontz transform can be combined with Fisher's method to allow a reduction of feature space from many dimensions to two. Performance is seen to be superior in general to the Foley-Sammon method. The technique is developed to show how a new radius vector (or pair of radius vectors) can be combined with Fisher's vector to produce a classifier with even more power of discrimination. Illustrations of the technique show that good discrimination can be obtained even if there is considerable overlap of classes in any one projection.
I. D. Longstaff, "On Extensions to Fisher's Linear Discriminant Function," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 9, no. , pp. 321-325, 1987.