Abstract
By representing a test sample with a linear combination of training samples, sparse representation-based classification (SRC) has shown promising performance in many applications such as computer vision and signal processing. However, there are several shortcomings in SRC such as 1) the l 2-norm employed by SRC to measure the reconstruction fidelity is noise sensitive and 2) the l 1-norm induced sparsity does not consider the correlation among the training samples. Furthermore, in real applications, face images with similar variations, such as illumination or expression, often have higher correlation than those from the same subject. Therefore, we correspondingly propose to improve the performance of SRC from two aspects by: 1) replacing the noise-sensitive l 2-norm with an M-estimator to enhance its robustness and 2) emphasizing the sparsity in terms of the number of classes instead of the number of training samples, which leads to the structured sparsity. The formulated robust structured sparse representation (RGSR) model can be efficiently optimized via alternating minimization method under the half-quadratic (HQ) optimization framework. Extensive experiments on representative face data sets show that RGSR can achieve competitive performance in face recognition and outperforms several state-of-the-art methods in dealing with various types of noise such as corruption, occlusion and disguise.















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Acknowledgments
The authors would like to thank the anonymous reviewers for their helpful comments on this paper. This work was partially supported by the National Natural Science Foundation of China (No.61272248), the National Basic Research Program of China (No.2013CB329401), the Science and Technology Commission of Shanghai Municipality (No.13511500200) and the funding of Hangzhou Dianzi University (KYS055616025).
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Peng, Y., Lu, BL. Robust structured sparse representation via half-quadratic optimization for face recognition. Multimed Tools Appl 76, 8859–8880 (2017). https://doi.org/10.1007/s11042-016-3510-3
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DOI: https://doi.org/10.1007/s11042-016-3510-3