A new discriminative sparse parameter classifier with iterative removal for face recognition

Abstract

Face recognition has been widely used and developed rapidly in recent years. The methods based on sparse representation have made great breakthroughs, and collaborative representation-based classification (CRC) is the typical representative. However, CRC cannot distinguish similar samples well, leading to a wrong classification easily. As an improved method based on CRC, the two-phase test sample sparse representation (TPTSSR) removes the samples that make little contribution to the representation of the testing sample. Nevertheless, only one removal is not sufficient, since some useless samples may still be retained, along with some useful samples maybe being removed randomly. In this work, a novel classifier, called discriminative sparse parameter (DSP) classifier with iterative removal, is proposed for face recognition. The proposed DSP classifier utilizes sparse parameter to measure the representation ability of training samples straight-forward. Moreover, to avoid some useful samples being removed randomly with only one removal, DSP classifier removes most uncorrelated samples gradually with iterations. Extensive experiments on different typical poses, expressions and noisy face datasets are conducted to assess the performance of the proposed DSP classifier. The experimental results demonstrate that DSP classifier achieves a better recognition rate than the well-known SRC, CRC, RRC, RCR, SRMVS, RFSR and TPTSSR classifiers for face recognition in various situations.

Keywords

collaborative representation-based classification / discriminative sparse parameter classifier / face recognition / iterative removal / sparse representation / two-phase test sample sparse representation

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