Shallow Optical Flow Three-Stream CNN for Macro- and Micro-Expression Spotting from Long Videos

06/11/2021 ∙ by Gen-Bing Liong, et al. ∙ 5

Facial expressions vary from the visible to the subtle. In recent years, the analysis of micro-expressions - a natural occurrence resulting from the suppression of one's true emotions, has drawn the attention of researchers with a broad range of potential applications. However, spotting microexpressions in long videos becomes increasingly challenging when intertwined with normal or macro-expressions. In this paper, we propose a shallow optical flow three-stream CNN (SOFTNet) model to predict a score that captures the likelihood of a frame being in an expression interval. By fashioning the spotting task as a regression problem, we introduce pseudo-labeling to facilitate the learning process. We demonstrate the efficacy and efficiency of the proposed approach on the recent MEGC 2020 benchmark, where state-of-the-art performance is achieved on CAS(ME)^2 with equally promising results on SAMM Long Videos.

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SoftNet-SpotME

Shallow Optical Flow Three-Stream CNN For Macro and Micro-Expression Spotting From Long Videos


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