Distinctive and compact features

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We consider the problem of extracting features for multi-class recognition problems. The features are required to make fine distinctions between similar classes, combined with tolerance for distortions and missing information. We define and compare two general approaches, both based on maximizing the delivered information for recognition: one divides the problem into multiple binary classification tasks, while the other uses a single multi-class scheme. The two strategies result in markedly different sets of features, which we apply to face identification and detection. We show that the first produces a sparse set of distinctive features that are specific to an individual face, and are highly tolerant to distortions and missing input. The second produces compact features, each shared by about half of the faces, which perform better in general face detection. The results show the advantage of distinctive features for making fine distinctions in a robust manner. They also show that different features are optimal for recognition tasks at different levels of specificity.

论文关键词:Feature selection,Object recognition,Distinctive features,Facial features

论文评审过程:Received 16 March 2006, Revised 3 March 2008, Accepted 4 March 2008, Available online 27 March 2008.

论文官网地址:https://doi.org/10.1016/j.imavis.2008.03.005