Optimization-based methodology for training set selection to synthesize composite correlation filters for face recognition |
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Affiliation: | 1. Department of computer science, The University of Hong Kong, Hong Kong;2. School of Software, Dalian University of Technology, Dalian, Liaoning, China;3. School of Computer Science and Technology, HangZhou Dianzi University, China;4. Department of Information Engineering and Computer Science, Feng Chia University, Taichung 40724, Taiwan;5. Department of Computer Science and Information Engineering, Asia University, Wufeng 41354, Taiwan;1. School of Computer Science and Technology, China University of Mining and Technology, Xuzhou 221116, China;2. Engineering Research Center of Mining Digital Ministry of Education, Xuzhou 221116, China;3. Key Laboratory of Opto-technology and Intelligent Control, Ministry of Education, Lanzhou Jiaotong University, Lanzhou 730070, China |
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Abstract: | Face recognition has been addressed with pattern recognition techniques such as composite correlation filters. These filters are synthesized from training sets which are representative of facial classes. For this reason, the filter performance depends greatly on the appropriate selection of the training set. This set can be selected either by a filter designer or by a conventional method. This paper presents an optimization-based methodology for the automatic selection of the training set. Given an optimization algorithm, the proposed methodology uses its main mechanics to iteratively examine a given set of available images in order to find the best subset for the training set. To this end, three objective functions are proposed as optimization criteria for training set selection. The proposed methodology was evaluated by undertaking face recognition under variable illumination and facial expressions. Four optimization algorithms and three composite correlation filters were used to test the proposed methodology. The Maximum Average Correlation Height filter designed by Grey Wolf Optimizer obtained the best performance under homogeneous illumination and facial expressions, while the Unconstrained Nonlinear Composite Filter designed by either Grey Wolf Optimizer or (1+1)-Evolution Strategy obtained the best performance under variable illumination. The proposed methodology selects training sets for the synthesis of composite filters with competitive results comparable to the results reported in the face recognition literature. |
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Keywords: | Training set selection Face recognition Composite correlation filter Optimization algorithm Pattern recognition |
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