Abstract
Considering the distinctiveness of different group features in the sparse representation, a novel joint multi-task and weighted group sparsity (JMT-WGS) method is proposed. By weighting popular group sparsity, not only the representation coefficients from the same class over their associate dictionaries may share some similarity, but also the representation coefficients from different classes have enough diversity. The proposed method is cast into a multi-task framework with two-stage iteration. In the first stage, representation coefficient can be optimized by accelerated proximal gradient method when the weights are fixed. In the second stage, the weights are computed via the prior information about their entropy. The experimental results on three facial expression databases show that the proposed algorithm outperforms other state-of-the-art algorithms and demonstrate the promising performance of the proposed algorithm.
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Acknowledgements
This work was partially supported by the Project funded by China Postdoctoral Science Foundation (2014M5615556), the National Natural Science Foundation of China (Grant Nos. 61273300, 61232007) and Jiangsu Natural Science Funds for Distinguished Young Scholar (BK20140022). Also it is partially supported by Jiangsu University Natural Science Funds (15KJB520024), the State Key Laboratory for Novel Software Technology from Nanjing University (KFKT2014B18), Jiangsu Key Laboratory of Image and Video Understanding for Social Safety (30920140122007). Finally, the authors would like to thank the anonymous reviewers for their constructive advice.
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Hao Zheng received the his BS degree from Southeast University (SEU), China in 1998, the MS degree from Nanjing University Posts and Telecommunications, China in 2005, and the PhD degree in pattern recognition and intelligence system from Nanjing University of Science and Technology, China in 2013. He is currently a postdoctor of SEU. His research interests include pattern recognition, image processing, face recognition, and computer vision.
Xin Geng received the BS (2001) and MS (2004) degrees in computer science from Nanjing University, China and the PhD (2008) degree in computer science from Deakin University, Australia. He has published over 25 refereed papers in these areas, including those published in prestigious journals and top international conferences. He has been a guest editor of several international journals, such as PRL and IJPRAI. He has served as a program committee member for a number of international conferences. He is also a frequent reviewer for various international journals and conferences. His research interests include computer vision, pattern recognition, and machine learning.
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Zheng, H., Geng, X. Facial expression recognition via weighted group sparsity. Front. Comput. Sci. 11, 266–275 (2017). https://doi.org/10.1007/s11704-016-5204-4
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DOI: https://doi.org/10.1007/s11704-016-5204-4