A Regularized Framework for Feature Selection in Face Detection and Authentication

Authors:
Augusto Destrero;Christine Mol;Francesca Odone;Alessandro Verri
Affiliations:
DISI, Università degli Studi di Genova, Genova, Italy 16146 and Imavis s.r.l., Genova, Italy 16152;Department of Mathematics and ECARES, Universite Libre de Bruxelles, Brussels, Belgium 1050;DISI, Università degli Studi di Genova, Genova, Italy 16146;DISI, Università degli Studi di Genova, Genova, Italy 16146
Venue:
International Journal of Computer Vision
Year:
2009

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Abstract

This paper proposes a general framework for selecting features in the computer vision domain--i.e., learning descriptions from data--where the prior knowledge related to the application is confined in the early stages. The main building block is a regularization algorithm based on a penalty term enforcing sparsity. The overall strategy we propose is also effective for training sets of limited size and reaches competitive performances with respect to the state-of-the-art. To show the versatility of the proposed strategy we apply it to both face detection and authentication, implementing two modules of a monitoring system working in real time in our lab. Aside from the choices of the feature dictionary and the training data, which require prior knowledge on the problem, the proposed method is fully automatic. The very good results obtained in different applications speak for the generality and the robustness of the framework.