Subclass discriminant Nonnegative Matrix Factorization for facial image analysis

Authors:
Symeon Nikitidis;Anastasios Tefas;Nikos Nikolaidis;Ioannis Pitas
Affiliations:
Department of Informatics, Aristotle University of Thessaloniki, Greece and Informatics and Telematics Institute, Center for Research and Technology, Hellas, Greece;Department of Informatics, Aristotle University of Thessaloniki, Greece;Department of Informatics, Aristotle University of Thessaloniki, Greece and Informatics and Telematics Institute, Center for Research and Technology, Hellas, Greece;Department of Informatics, Aristotle University of Thessaloniki, Greece and Informatics and Telematics Institute, Center for Research and Technology, Hellas, Greece
Venue:
Pattern Recognition
Year:
2012

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Abstract

Nonnegative Matrix Factorization (NMF) is among the most popular subspace methods, widely used in a variety of image processing problems. Recently, a discriminant NMF method that incorporates Linear Discriminant Analysis inspired criteria has been proposed, which achieves an efficient decomposition of the provided data to its discriminant parts, thus enhancing classification performance. However, this approach possesses certain limitations, since it assumes that the underlying data distribution is unimodal, which is often unrealistic. To remedy this limitation, we regard that data inside each class have a multimodal distribution, thus forming clusters and use criteria inspired by Clustering based Discriminant Analysis. The proposed method incorporates appropriate discriminant constraints in the NMF decomposition cost function in order to address the problem of finding discriminant projections that enhance class separability in the reduced dimensional projection space, while taking into account subclass information. The developed algorithm has been applied for both facial expression and face recognition on three popular databases. Experimental results verified that it successfully identified discriminant facial parts, thus enhancing recognition performance.