Abstract
Facial expression recognition is an important task in human-computer interaction. Some methods work well on ”lab-controlled” data. However, their performances degenerate dramatically on real-world data as expression covers large variations, including pose, illumination, occlusion, and even culture change. To deal with this problem, large scale data is definitely needed. On the other hand, collecting and labeling wild expression data can be difficult and time consuming. In this paper, aiming at robust expression recognition in wild which suffers from the mentioned problems, we propose a semi-supervised method to make use of the large scale unlabeled data in two steps: 1) We enrich reference manifolds using selected unlabeled data which are closed to certain kind of expression. The learned manifolds can help smooth the variation of original data and provide reliable metric to maintain semantic similarity of expression; 2) To elevate the original labeled set for enhanced training, we iteratively employ the semi-supervised clustering to assign labels for unlabeled data and add the most discriminant ones into the labeled set. Experiments on the latest wild expression database SFEW and GENKI show that the proposed method can effectively exploit unlabeled data to improve the performance on real-world expression recognition.
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Liu, M., Li, S., Shan, S., Chen, X. (2013). Enhancing Expression Recognition in the Wild with Unlabeled Reference Data. In: Lee, K.M., Matsushita, Y., Rehg, J.M., Hu, Z. (eds) Computer Vision – ACCV 2012. ACCV 2012. Lecture Notes in Computer Science, vol 7725. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37444-9_45
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DOI: https://doi.org/10.1007/978-3-642-37444-9_45
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