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Micro-Expression Recognition (MER) is a challenging task as the subtle changes occur over different action regions of a face. Changes in facial action regions are formed as Action Units (AUs), and AUs in micro-expressions can be seen as the…

Computer Vision and Pattern Recognition · Computer Science 2021-03-24 Ling Zhou , Qirong Mao , Ming Dong

Micro-expression recognition (MER) has drawn increasing attention in recent years due to its potential applications in intelligent medical and lie detection. However, the shortage of annotated data has been the major obstacle to further…

Computer Vision and Pattern Recognition · Computer Science 2024-06-05 Hanting Li , Hongjing Niu , Feng Zhao

Micro-expressions (MEs) are spontaneous, unconscious facial expressions that have promising applications in various fields such as psychotherapy and national security. Thus, micro-expression recognition (MER) has attracted more and more…

Computer Vision and Pattern Recognition · Computer Science 2024-07-11 Ruolin Li , Lu Wang , Tingting Yang , Lisheng Xu , Bingyang Ma , Yongchun Li , Hongchao Wei

Micro-expressions (MEs) are involuntary and subtle facial expressions that are thought to reveal feelings people are trying to hide. ME spotting detects the temporal intervals containing MEs in videos. Detecting such quick and subtle…

Computer Vision and Pattern Recognition · Computer Science 2023-05-10 Yini Fang , Didan Deng , Liang Wu , Frederic Jumelle , Bertram Shi

Facial micro-expressions are sudden involuntary minute muscle movements which reveal true emotions that people try to conceal. Spotting a micro-expression and recognizing it is a major challenge owing to its short duration and intensity.…

Computer Vision and Pattern Recognition · Computer Science 2019-04-22 Sauradip Nag , Ayan Kumar Bhunia , Aishik Konwer , Partha Pratim Roy

Facial micro-expressions (MEs) are involuntary movements of the face that occur spontaneously when a person experiences an emotion but attempts to suppress or repress the facial expression, typically found in a high-stakes environment. In…

Computer Vision and Pattern Recognition · Computer Science 2025-10-16 Xinqi Fan , Jingting Li , John See , Moi Hoon Yap , Wen-Huang Cheng , Xiaobai Li , Xiaopeng Hong , Su-Jing Wang , Adrian K. Davision

Facial micro-expressions are spontaneous, brief and subtle facial motions that unveil the underlying, suppressed emotions. Detecting Action Units (AUs) in micro-expressions is crucial because it yields a finer representation of facial…

Computer Vision and Pattern Recognition · Computer Science 2025-04-15 Huai-Qian Khor , Yante Li , Xingxun Jiang , Guoying Zhao

Spontaneous subtle emotions are expressed through micro-expressions, which are tiny, sudden and short-lived dynamics of facial muscles; thus poses a great challenge for visual recognition. The abrupt but significant dynamics for the…

Computer Vision and Pattern Recognition · Computer Science 2016-02-12 Anh Cat Le Ngo , John See , Raphael Chung-Wei Phan

Micro-expression recognition (MER) aims to recognize the short and subtle facial movements from the Micro-expression (ME) video clips, which reveal real emotions. Recent MER methods mostly only utilize special frames from ME video clips or…

Computer Vision and Pattern Recognition · Computer Science 2024-05-07 Haihong Hao , Shuo Wang , Huixia Ben , Yanbin Hao , Yansong Wang , Weiwei Wang

How to extract effective expression representations that invariant to the identity-specific attributes is a long-lasting problem for facial expression recognition (FER). Most of the previous methods process the RGB images of a sequence,…

Computer Vision and Pattern Recognition · Computer Science 2021-06-08 Xiaofeng Liu , Linghao Jin , Xu Han , Jane You

Facial expression recognition (FER) is an essential task for understanding human behaviors. As one of the most informative behaviors of humans, facial expressions are often compound and variable, which is manifested by the fact that…

Computer Vision and Pattern Recognition · Computer Science 2023-03-02 Hanting Li , Hongjing Niu , Zhaoqing Zhu , Feng Zhao

As artificial intelligence (AI) systems become increasingly embedded in our daily life, the ability to recognize and adapt to human emotions is essential for effective human-computer interaction. Facial expression recognition (FER) provides…

Computer Vision and Pattern Recognition · Computer Science 2025-12-16 Thibault Geoffroy , Myriam Maumy , Lionel Prevost

Micro-expressions (MEs) are brief and involuntary facial expressions that occur when people are trying to hide their true feelings or conceal their emotions. Based on psychology research, MEs play an important role in understanding genuine…

Computer Vision and Pattern Recognition · Computer Science 2020-12-29 Thuong-Khanh Tran , Quang-Nhat Vo , Xiaopeng Hong , Xiaobai Li , Guoying Zhao

In this work, we present a lightweight and privacy-preserving Multimodal Emotion Recognition (MER) framework designed for deployment on edge devices. To demonstrate framework's versatility, our implementation uses three modalities - speech,…

Artificial Intelligence · Computer Science 2026-02-11 Rémi Grzeczkowicz , Eric Soriano , Ali Janati , Miyu Zhang , Gerard Comas-Quiles , Victor Carballo Araruna , Aneesh Jonelagadda

Facial expression is temporally dynamic event which can be decomposed into a set of muscle motions occurring in different facial regions over various time intervals. For dynamic expression recognition, two key issues, temporal alignment and…

Computer Vision and Pattern Recognition · Computer Science 2016-11-23 Mengyi Liu , Shiguang Shan , Ruiping Wang , Xilin Chen

Micro-expression recognition (MER) is a highly challenging task in affective computing. With the reduced-sized micro-expression (ME) input that contains key information based on key-frame indexes, key-frame-based methods have significantly…

Computer Vision and Pattern Recognition · Computer Science 2025-08-12 Zheyuan Zhang , Weihao Tang , Hong Chen

Micro-expressions (MEs), brief and low-intensity facial movements revealing concealed emotions, are crucial for affective computing. Despite notable progress in ME recognition, existing methods are largely confined to discrete emotion…

Computer Vision and Pattern Recognition · Computer Science 2025-12-10 Sirui Zhao , Zhengye Zhang , Shifeng Liu , Xinglong Mao , Shukang Yin , Chaoyou Fu , Tong Xu , Enhong Chen

Dynamic facial expression recognition (DFER) aims to identify emotional states by modeling the temporal changes in facial movements across video sequences. A key challenge in DFER is the many-to-one labeling problem, where a video composed…

Computer Vision and Pattern Recognition · Computer Science 2025-11-17 Gunho Jung , Heejo Kong , Seong-Whan Lee

Facial Expression Recognition (FER) is a critical task within computer vision with diverse applications across various domains. Addressing the challenge of limited FER datasets, which hampers the generalization capability of expression…

Computer Vision and Pattern Recognition · Computer Science 2024-05-14 Bach Nguyen-Xuan , Thien Nguyen-Hoang , Thanh-Huy Nguyen , Nhu Tai-Do

Micro-expressions (MEs) are brief, involuntary facial movements that reveal genuine emotions, offering valuable insights for psychological assessment and criminal investigations. Despite significant progress in automatic ME recognition…

Human-Computer Interaction · Computer Science 2025-08-06 Xinglong Mao , Shifeng Liu , Sirui Zhao , Tong Xu , Hanchao Wang , Baozhi Jia , Enhong Chen