Abstract
The performance of facial expression recognition (FER) would be degraded due to the influenced factors such as individual differences and limited number of training samples. Therefore, reducing the influenced factors in facial images may be useful for improving the performances of FER. In this paper, we propose to reduce the influenced factors for robust FER. First, we reduce the influences of individual differences by the auxiliary neutral dictionary and obtain the feature space which highlights the expression features. Then we exploit the difference training samples to synthesize the virtual training samples to alleviate the influenced factors of the limited training samples. Third, we combine the difference dictionary with virtual training samples to form the extended dictionary and select the optimal training samples from the extended dictionary. Finally, we exploit the optimal training samples based ℓ 2-norm representation algorithm for the classification.







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Acknowledgments
This work is supported by National Natural Science Foundation of China (No. 61071199), National Natural Science Foundation of China under Grant (No. 61771420), Natural Science Foundation of Hebei Province of China (No. F2016203422), and Postgraduate Innovation Project of Hebei Province (No. CXZZBS2017051). The authors declare that there is no conflict of interests regarding the publication of this paper.
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Sun, Z., Hu, Zp. & Wang, M. Influenced factors reduction for robust facial expression recognition. Multimed Tools Appl 77, 16947–16963 (2018). https://doi.org/10.1007/s11042-017-5264-y
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DOI: https://doi.org/10.1007/s11042-017-5264-y