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Micro-expression recognition (MER) is a challenging task due to the subtle and fleeting nature of micro-expressions. Traditional input modalities, such as Apex Frame, Optical Flow, and Dynamic Image, often fail to adequately capture these…

Computer Vision and Pattern Recognition · Computer Science 2026-05-26 Luu Tu Nguyen , Vu Tram Anh Khuong , Thanh Ha Le , Thi Duyen Ngo

Facial Action Coding System consists of 44 action units (AUs) and more than 7000 combinations. Hidden Markov models (HMMs) classifier has been used successfully to recognize facial action units (AUs) and expressions due to its ability to…

Computer Vision and Pattern Recognition · Computer Science 2010-04-06 Mahmoud Khademi , Mohammad T. Manzuri-Shalmani , Mohammad H. Kiapour , Ali A. Kiaei

Micro-expression has emerged as a promising modality in affective computing due to its high objectivity in emotion detection. Despite the higher recognition accuracy provided by the deep learning models, there are still significant scope…

Computer Vision and Pattern Recognition · Computer Science 2022-01-25 Viswanatha Reddy Gajjala , Sai Prasanna Teja Reddy , Snehasis Mukherjee , Shiv Ram Dubey

In this paper, we present our solution for the Second Multimodal Emotion Recognition Challenge Track 1(MER2024-SEMI). To enhance the accuracy and generalization performance of emotion recognition, we propose several methods for Multimodal…

Computer Vision and Pattern Recognition · Computer Science 2024-09-12 Anbin QI , Zhongliang Liu , Xinyong Zhou , Jinba Xiao , Fengrun Zhang , Qi Gan , Ming Tao , Gaozheng Zhang , Lu Zhang

Although state-of-the-art classifiers for facial expression recognition (FER) can achieve a high level of accuracy, they lack interpretability, an important feature for end-users. Experts typically associate spatial action units (\aus) from…

Computer Vision and Pattern Recognition · Computer Science 2024-05-15 Soufiane Belharbi , Marco Pedersoli , Alessandro Lameiras Koerich , Simon Bacon , Eric Granger

Expressions and facial action units (AUs) are two levels of facial behavior descriptors. Expression auxiliary information has been widely used to improve the AU detection performance. However, most existing expression representations can…

Computer Vision and Pattern Recognition · Computer Science 2022-10-31 Rudong An , Wei Zhang , Hao Zeng , Wei Chen , Zhigang Deng , Yu Ding

Detecting facial action units (AU) is one of the fundamental steps in automatic recognition of facial expression of emotions and cognitive states. Though there have been a variety of approaches proposed for this task, most of these models…

Computer Vision and Pattern Recognition · Computer Science 2019-11-28 Mihee Lee , Ognjen Rudovic , Vladimir Pavlovic , Maja Pantic

Facial expression recognition (FER) is an important research topic in emotional artificial intelligence. In recent decades, researchers have made remarkable progress. However, current FER paradigms face challenges in generalization, lack…

Computer Vision and Pattern Recognition · Computer Science 2024-08-22 Bohao Xing , Zitong Yu , Xin Liu , Kaishen Yuan , Qilang Ye , Weicheng Xie , Huanjing Yue , Jingyu Yang , Heikki Kälviäinen

Facial action unit (FAU) intensities are popular descriptors for the analysis of facial behavior. However, FAUs are sparsely represented when only a few are activated at a time. In this study, we explore the possibility of representing the…

Computer Vision and Pattern Recognition · Computer Science 2021-08-24 Minh Tran , Ellen Bradley , Michelle Matvey , Joshua Woolley , Mohammad Soleymani

The Facial Action Coding System (FACS) has been used by numerous studies to investigate the links between facial behavior and mental health. The laborious and costly process of FACS coding has motivated the development of machine learning…

Computer Vision and Pattern Recognition · Computer Science 2025-06-02 Evangelos Sariyanidi , Lisa Yankowitz , Robert T. Schultz , John D. Herrington , Birkan Tunc , Jeffrey Cohn

In recent years, Multimodal Emotion Recognition (MER) has made substantial progress. Nevertheless, most existing approaches neglect the semantic inconsistencies that may arise across modalities, such as conflicting emotional cues between…

Computer Vision and Pattern Recognition · Computer Science 2025-10-24 Guowei Zhong , Junjie Li , Huaiyu Zhu , Ruohong Huan , Yun Pan

Emotions play a crucial role in human behavior and decision-making, making emotion recognition a key area of interest in human-computer interaction (HCI). This study addresses the challenges of emotion recognition by integrating facial…

Computer Vision and Pattern Recognition · Computer Science 2025-02-04 Zaitian Wang , Jian He , Yu Liang , Xiyuan Hu , Tianhao Peng , Kaixin Wang , Jiakai Wang , Chenlong Zhang , Weili Zhang , Shuang Niu , Xiaoyang Xie

Facial expression recognition(FER) in the wild is crucial for building reliable human-computer interactive systems. However, current FER systems fail to perform well under various natural and un-controlled conditions. This report presents…

Computer Vision and Pattern Recognition · Computer Science 2020-10-13 Darshan Gera , S Balasubramanian

Facial action units (AUs), as defined in the Facial Action Coding System (FACS), have received significant research interest owing to their diverse range of applications in facial state analysis. Current mainstream FAU recognition models…

Computer Vision and Pattern Recognition · Computer Science 2024-08-02 Xuri Ge , Junchen Fu , Fuhai Chen , Shan An , Nicu Sebe , Joemon M. Jose

The Facial Action Coding System (FACS) for studying facial expressions is manual and requires significant effort and expertise. This paper explores the use of automated techniques to generate Action Units (AUs) for studying facial…

Computer Vision and Pattern Recognition · Computer Science 2024-06-14 Shivansh Chandra Tripathi , Rahul Garg

Micro-expression recognition is one of the most challenging topics in affective computing. It aims to recognize tiny facial movements difficult for humans to perceive in a brief period, i.e., 0.25 to 0.5 seconds. Recent advances in…

Computer Vision and Pattern Recognition · Computer Science 2023-04-07 Xuan-Bac Nguyen , Chi Nhan Duong , Xin Li , Susan Gauch , Han-Seok Seo , Khoa Luu

Deep learning vision models excel with abundant supervision, but many applications face label scarcity and class imbalance. Controllable image editing can augment scarce labeled data, yet edits often introduce artifacts and entangle…

Computer Vision and Pattern Recognition · Computer Science 2026-02-24 Joris Kirchner , Amogh Gudi , Marian Bittner , Chirag Raman

Understanding human affective behaviour, especially in the dynamics of real-world settings, requires Facial Expression Recognition (FER) models to continuously adapt to individual differences in user expression, contextual attributions, and…

Computer Vision and Pattern Recognition · Computer Science 2023-05-12 Nikhil Churamani , Tolga Dimlioglu , German I. Parisi , Hatice Gunes

Micro-expression recognition plays a pivotal role in understanding hidden emotions and has applications across various fields. Traditional recognition methods assume access to all training data at once, but real-world scenarios involve…

Computer Vision and Pattern Recognition · Computer Science 2026-03-31 Zhengqin Lai , Xiaopeng Hong , Yabin Wang , Xiaobai Li

Facial action unit (AU) detection and facial expression (FE) recognition can be jointly viewed as affective facial behavior tasks, representing fine-grained muscular activations and coarse-grained holistic affective states, respectively.…

Computer Vision and Pattern Recognition · Computer Science 2026-04-21 Jia Li , Yu Zhang , Yin Chen , Zhenzhen Hu , Yong Li , Richang Hong , Shiguang Shan , Meng Wang