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Effective recognition of facial micro-expressions with video motion magnification

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Abstract

Facial expression recognition has been intensively studied for decades, notably by the psychology community and more recently the pattern recognition community. What is more challenging, and the subject of more recent research, is the problem of recognizing subtle emotions exhibited by so-called micro-expressions. Recognizing a micro-expression is substantially more challenging than conventional expression recognition because these micro-expressions are only temporally exhibited in a fraction of a second and involve minute spatial changes. Until now, work in this field is at a nascent stage, with only a few existing micro-expression databases and methods. In this article, we propose a new micro-expression recognition approach based on the Eulerian motion magnification technique, which could reveal the hidden information and accentuate the subtle changes in micro-expression motion. Validation of our proposal was done on the recently proposed CASME II dataset in comparison with baseline and state-of-the-art methods. We achieve a good recognition accuracy of up to 75.30 % by using leave-one-out cross validation evaluation protocol. Extensive experiments on various factors at play further demonstrate the effectiveness of our proposed approach.

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Notes

  1. 1 Original paper [49] reported the best possible result of 63.41 % using different set of settings.

  2. 2 Leave-one-subject-out cross validation (LOSOCV) is a subject-independent evaluation where the videos of one object are held out as testing set while the remaining videos form the training set. This is then repeated for all subjects in dataset, and the average accuracy rate across all folds is taken.

    Table 2 Confusion tables of the proposed and baseline methods using SVM classifier with linear kernel (LOSOCV protocol)
    Table 3 Confusion tables of the proposed and baseline methods using SVM classifier with RBF kernel (LOSOCV protocol)
  3. 3 We empirically found that k=5 yielded the best possible result for kNN.

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Acknowledgments

This work is supported by Zhejiang Provincial Natural Science Foundation of China (Grant Nos. LQ17F020002 and LQ14F020006), TM Grant under project UbeAware and 2beAware, and MOHE Grant FRGS/1/2016/ICT02/MMU/02/2. The authors would like to thank the Chinese Academy of Sciences for the CASME II micro-expression database and Su-Jing Wang for providing more details of their CASME II work in [49].

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Correspondence to Yandan Wang.

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Wang, Y., See, J., Oh, YH. et al. Effective recognition of facial micro-expressions with video motion magnification. Multimed Tools Appl 76, 21665–21690 (2017). https://doi.org/10.1007/s11042-016-4079-6

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