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Lite general network and MagFace CNN for micro-expression spotting in long videos

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Abstract

Facial expressions, especially spontaneous micro-expressions, as an intuitive reflection of human emotions, have come through much concern along with rapid advances in computer vision recently. Micro-expressions are small in amplitude and short in duration and often appear together with macro-expressions, making micro-expression spotting in long videos a challenging task. In this article, we propose intersection over minimum labelling method combined with a Lite General Network and MagFace CNN (LGNMNet) model to predict the possibility of video frames belonging to a micro-expression interval, which balances easy and difficult samples to improve the learning effect of training process. Experimental results show that our method achieves state-of-the-art performance in spotting micro-expressions in long videos of both the CAS(ME)2 and SAMM-LV datasets (with F1-scores of 0.2474 and 0.2555, respectively). Additionally, a new pair-merge way of combining nearby detected apex frames to construct micro-expression intervals in post-processing stage has been devised and analysed, providing a feasible solution for the task of macro- and micro-spotting in long videos.

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Data availability

The datasets including SAMM and CAS(ME)2 that support the findings of this study are available at http://www2.docm.mmu.ac.uk/STAFF/M.Yap/dataset.php and http://fu.psych.ac.cn/CASME/casme2-en.php respectively.

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Contributions

SY and TY: wrote the main manuscript text. Q-LG: discussed key methods and experiments. All authors reviewed the manuscript.

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Correspondence to Sai Yang.

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The authors declare no competing interests.

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Communicated by B. Bao.

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Gu, QL., Yang, S. & Yu, T. Lite general network and MagFace CNN for micro-expression spotting in long videos. Multimedia Systems 29, 3521–3530 (2023). https://doi.org/10.1007/s00530-023-01145-3

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  • DOI: https://doi.org/10.1007/s00530-023-01145-3