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Issue No. 09 - September (1975 vol. 24)
ISSN: 0018-9340
pp: 944-948
C.W. Therrien , Massachusetts Institute of Technology Lincoln Laboratory
The subspace method proposed by Watanabe et al. is an important method of feature extraction in pattern recognition. Some new results described here provide a formulation of the subspace method that is particularly easy to implement and overcomes the various numerical difficulties that were inherent in earlier implementations of the method. The present formulation is also important in that it provides the key to the relation of this method to other methods of feature extraction.

C. Therrien, "Eigenvalue Properties of Projection Operators and Their Application to the Subspace Method of Feature Extraction," in IEEE Transactions on Computers, vol. 24, no. , pp. 944-948, 1975.
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