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Responsive and accurate facial expression recognition is crucial to human-robot interaction for daily service robots. Nowadays, event cameras are becoming more widely adopted as they surpass RGB cameras in capturing facial expression…

Computer Vision and Pattern Recognition · Computer Science 2025-12-11 Zhe Wang , Qijin Song , Yucen Peng , Weibang Bai

Facial expression recognition has been an active research area over the past few decades, and it is still challenging due to the high intra-class variation. Traditional approaches for this problem rely on hand-crafted features such as SIFT,…

Computer Vision and Pattern Recognition · Computer Science 2019-02-05 Shervin Minaee , Amirali Abdolrashidi

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

Compound Expression Recognition (CER) is vital for effective interpersonal interactions. Human emotional expressions are inherently complex due to the presence of compound expressions, requiring the consideration of both local and global…

Computer Vision and Pattern Recognition · Computer Science 2024-07-29 Xuxiong Liu , Kang Shen , Jun Yao , Boyan Wang , Minrui Liu , Liuwei An , Zishun Cui , Weijie Feng , Xiao Sun

Automated Facial Expression Recognition (FER) has remained a challenging and interesting problem. Despite efforts made in developing various methods for FER, existing approaches traditionally lack generalizability when applied to unseen…

Neural and Evolutionary Computing · Computer Science 2016-11-18 Ali Mollahosseini , David Chan , Mohammad H. Mahoor

In this work, we leverage ensemble learning as a tool for the creation of faster, smaller, and more accurate deep learning models. We demonstrate that we can jointly optimize for accuracy, inference time, and the number of parameters by…

Neural and Evolutionary Computing · Computer Science 2021-05-04 Marc Ortiz , Florian Scheidegger , Marc Casas , Cristiano Malossi , Eduard Ayguadé

Deep facial expression recognition faces two challenges that both stem from the large number of trainable parameters: long training times and a lack of interpretability. We propose a novel method based on evolutionary algorithms, that deals…

Neural and Evolutionary Computing · Computer Science 2020-10-14 Emmanuel Dufourq , Bruce A. Bassett

Facial expressions are one of the most powerful ways for depicting specific patterns in human behavior and describing human emotional state. Despite the impressive advances of affective computing over the last decade, automatic video-based…

Computer Vision and Pattern Recognition · Computer Science 2021-01-18 Thomas Teixeira , Eric Granger , Alessandro Lameiras Koerich

Recently, deep learning based facial expression recognition (FER) methods have attracted considerable attention and they usually require large-scale labelled training data. Nonetheless, the publicly available facial expression databases…

Computer Vision and Pattern Recognition · Computer Science 2020-02-07 Yan Yan , Ying Huang , Si Chen , Chunhua Shen , Hanzi Wang

In person re-identification (re-ID), the key task is feature representation, which is used to compute distance or similarity in prediction. Person re-ID achieves great improvement when deep learning methods are introduced to tackle this…

Computer Vision and Pattern Recognition · Computer Science 2019-01-18 Jiabao Wang , Yang Li , Zhuang Miao

Artificial neural networks have been successfully applied to a variety of machine learning tasks, including image recognition, semantic segmentation, and machine translation. However, few studies fully investigated ensembles of artificial…

Machine Learning · Statistics 2017-04-07 Cheng Ju , Aurélien Bibaut , Mark J. van der Laan

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

Ensemble learning is a general technique to improve accuracy in machine learning. However, the heavy computation of a ConvNets ensemble limits its usage in deep learning. In this paper, we present Group Ensemble Network (GENet), an…

Computer Vision and Pattern Recognition · Computer Science 2020-07-02 Hao Chen , Abhinav Shrivastava

Ensemble learning has had many successes in supervised learning, but it has been rare in unsupervised learning and dimensionality reduction. This study explores dimensionality reduction ensembles, using principal component analysis and…

Machine Learning · Statistics 2017-10-13 Colleen M. Farrelly

With the transition of facial expression recognition (FER) from laboratory-controlled to challenging in-the-wild conditions and the recent success of deep learning techniques in various fields, deep neural networks have increasingly been…

Computer Vision and Pattern Recognition · Computer Science 2020-04-20 Shan Li , Weihong Deng

Residual-based neural networks have shown remarkable results in various visual recognition tasks including Facial Expression Recognition (FER). Despite the tremendous efforts have been made to improve the performance of FER systems using…

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

Ensemble methods can deliver surprising performance gains but also bring significantly higher computational costs, e.g., can be up to 2048X in large-scale ensemble tasks. However, we found that the majority of computations in ensemble…

Machine Learning · Computer Science 2023-01-31 Ziyue Li , Kan Ren , Yifan Yang , Xinyang Jiang , Yuqing Yang , Dongsheng Li

Facial Expressions Recognition(FER) on low-resolution images is necessary for applications like group expression recognition in crowd scenarios(station, classroom etc.). Classifying a small size facial image into the right expression…

Computer Vision and Pattern Recognition · Computer Science 2020-04-07 Wei Jing , Feng Tian , Jizhong Zhang , Kuo-Ming Chao , Zhenxin Hong , Xu Liu

In this paper, a deep learning framework is proposed for automatic facial emotion based on deep convolutional networks. In order to increase the generalization ability and the robustness of the method, the dataset size is increased by…

Computer Vision and Pattern Recognition · Computer Science 2026-04-23 Serap Kırbız

Recognizing facial expressions from static images or video sequences is a widely studied but still challenging problem. The recent progresses obtained by deep neural architectures, or by ensembles of heterogeneous models, have shown that…

Computer Vision and Pattern Recognition · Computer Science 2018-10-25 Lisa Graziani , Stefano Melacci , Marco Gori