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This work proposes a subspace approach that regularizes and extracts eigenfeatures from the face image. Eigenspace of the within-class scatter matrix is decomposed into three subspaces: a reliable subspace spanned mainly by the facial variation, an unstable subspace due to noise and finite number of training samples and a null subspace. Eigenfeatures are regularized differently in these three subspaces based on an eigenspectrum model to alleviate problems of instability, over-fitting or poor generalization. This also enables the discriminant evaluation performed in the whole space. Feature extraction or dimensionality reduction occurs only at the final stage after the discriminant assessment. These efforts facilitate a discriminative and stable low-dimensional feature representation of the face image. Experiments comparing the proposed approach with some other popular subspace methods on the FERET, ORL, AR and GT databases show that our method consistently outperforms others.
Face recognition, linear discriminant analysis, regularization, feature extraction, subspace methods

A. Kot, B. Mandal and X. Jiang, "Eigenfeature Regularization and Extraction in Face Recognition," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 30, no. , pp. 383-394, 2007.
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