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This paper presents a subject-independent facial action unit (AU) detection method by introducing the concept of relative AU detection, for scenarios where the neutral face is not provided. We propose a new classification objective function…

Computer Vision and Pattern Recognition · Computer Science 2014-05-02 Mahmoud Khademi , Louis-Philippe Morency

Facial expression is the most natural means for human beings to communicate their emotions. Most facial expression analysis studies consider the case of acted expressions. Spontaneous facial expression recognition is significantly more…

Computer Vision and Pattern Recognition · Computer Science 2018-10-02 Dawood Al Chanti , Alice Caplier

People naturally understand emotions, thus permitting a machine to do the same could open new paths for human-computer interaction. Facial expressions can be very useful for emotion recognition techniques, as these are the biggest…

Computer Vision and Pattern Recognition · Computer Science 2023-11-21 Pietro B. S. Masur , Willams Costa , Lucas S. Figueredo , Veronica Teichrieb

Facial Action Units (AUs) represent a set of facial muscular activities and various combinations of AUs can represent a wide range of emotions. AU recognition is often used in many applications, including marketing, healthcare, education,…

Computer Vision and Pattern Recognition · Computer Science 2021-07-09 Junya Saito , Xiaoyu Mi , Akiyoshi Uchida , Sachihiro Youoku , Takahisa Yamamoto , Kentaro Murase , Osafumi Nakayama

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

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

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

Facial pain expression is an important modality for assessing pain, especially when the patient's verbal ability to communicate is impaired. The facial muscle-based action units (AUs), which are defined by the Facial Action Coding System…

Computer Vision and Pattern Recognition · Computer Science 2018-11-21 Zhanli Chen , Rashid Ansari , Diana Wilkie

Facial expression recognition (FER) has emerged as a promising approach to the development of emotion-aware intelligent agents and systems. However, key challenges remain in utilizing FER in real-world contexts, including ensuring user…

Human-Computer Interaction · Computer Science 2025-07-31 Sanjeev Nahulanthran , Leimin Tian , Dana Kulić , Mor Vered

Automated recognition of facial expressions of emotions, and detection of facial action units (AUs), from videos depends critically on modeling of their dynamics. These dynamics are characterized by changes in temporal phases…

Computer Vision and Pattern Recognition · Computer Science 2015-10-15 Robert Walecki , Ognjen Rudovic , Vladimir Pavlovic , Maja Pantic

Light field (LF) cameras provide rich spatio-angular visual representations by sensing the visual scene from multiple perspectives and have recently emerged as a promising technology to boost the performance of human-machine systems such as…

Computer Vision and Pattern Recognition · Computer Science 2021-02-24 Alireza Sepas-Moghaddam , Ali Etemad , Fernando Pereira , Paulo Lobato Correia

Facial action unit recognition is an important task for facial analysis. Owing to the complex collection environment, facial action unit recognition in the wild is still challenging. The 3rd competition on affective behavior analysis…

Computer Vision and Pattern Recognition · Computer Science 2022-03-29 Shangfei Wang , Yanan Chang , Jiahe Wang

Automatic facial expression classification (FER) from videos is a critical problem for the development of intelligent human-computer interaction systems. Still, it is a challenging problem that involves capturing high-dimensional…

Computer Vision and Pattern Recognition · Computer Science 2016-07-22 Arnaud Dapogny , Kévin Bailly , Séverine Dubuisson

We present a new end-to-end network architecture for facial expression recognition with an attention model. It focuses attention in the human face and uses a Gaussian space representation for expression recognition. We devise this…

Computer Vision and Pattern Recognition · Computer Science 2019-02-12 Pedro D. Marrero Fernandez , Fidel A. Guerrero Peña , Tsang Ing Ren , Alexandre Cunha

Automated Facial Expression Recognition (FER) has been a challenging task for decades. Many of the existing works use hand-crafted features such as LBP, HOG, LPQ, and Histogram of Optical Flow (HOF) combined with classifiers such as Support…

Computer Vision and Pattern Recognition · Computer Science 2020-04-17 Behzad Hasani , Mohammad H. Mahoor

Automatic facial expression spotting, which aims to identify facial expression instances in untrimmed videos, is crucial for facial expression analysis. Existing methods primarily focus on fully-supervised learning and rely on costly,…

Computer Vision and Pattern Recognition · Computer Science 2026-01-07 Yicheng Deng , Hideaki Hayashi , Hajime Nagahara

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

The automatic recognition of facial expressions has been an active research topic since the early nineties. There have been several advances in the past few years in terms of face detection and tracking, feature extraction mechanisms and…

Computer Vision and Pattern Recognition · Computer Science 2012-04-02 Vinay Bettadapura

Recognizing human emotion/expressions automatically is quite an expected ability for intelligent robotics, as it can promote better communication and cooperation with humans. Current deep-learning-based algorithms may achieve impressive…

Computer Vision and Pattern Recognition · Computer Science 2021-04-05 Tao Pu , Tianshui Chen , Yuan Xie , Hefeng Wu , Liang Lin

In this paper an accurate real-time sequence-based system for representation, recognition, interpretation, and analysis of the facial action units (AUs) and expressions is presented. Our system has the following characteristics: 1)…

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