Nonorthogonal Projections for Feature Extraction in Pattern Recognition
Thomas W. Calvert · IEEE Transactions on Computers · 1970
It is known that R linearly separable classes of multidimensional pattern vectors can always be represented in a feature space of at most R dimensions. An approach is developed which can frequently be used to find a nonorthogonal transformation to project the patterns into a feature space of considerably lower dimensionality. Examples involving classification of handwritten and printed digits are used to illustrate the technique.