Canonical correlation analysis using within-class coupling

Authors:
Olcay Kursun;Ethem Alpaydin;Oleg V. Favorov
Affiliations:
Department of Computer Engineering, Istanbul University, Avcilar, Istanbul 34320, Turkey;Department of Computer Engineering, Bogazici University, Bebek, Istanbul 34342, Turkey;Biomedical Engineering Department, University of North Carolina, Chapel Hill, NC 27599-7575, USA
Venue:
Pattern Recognition Letters
Year:
2011

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Abstract

Fisher's linear discriminant analysis (LDA) is one of the most popular supervised linear dimensionality reduction methods. Unfortunately, LDA is not suitable for problems where the class labels are not available and only the spatial or temporal association of data samples is implicitly indicative of class membership. In this study, a new strategy for reducing LDA to Hotelling's canonical correlation analysis (CCA) is proposed. CCA seeks prominently correlated projections between two views of data and it has been long known to be equivalent to LDA when the data features are used in one view and the class labels are used in the other view. The basic idea of the new equivalence between LDA and CCA, which we call within-class coupling CCA (WCCCA), is to apply CCA to pairs of data samples that are most likely to belong to the same class. We prove the equivalence between LDA and such an application of CCA. With such an implicit representation of the class labels, WCCCA is applicable both to regular LDA problems and to problems in which only spatial and/or temporal continuity provides clues to the class labels.