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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

There has been a remarkable progress in learning a model which could recognise novel classes with only a few labeled examples in the last few years. Few-shot learning (FSL) for action recognition is a challenging task of recognising novel…

Computer Vision and Pattern Recognition · Computer Science 2021-08-23 Neeraj Kumar , Siddhansh Narang

Early action recognition is an important and challenging problem that enables the recognition of an action from a partially observed video stream where the activity is potentially unfinished or even not started. In this work, we propose a…

Computer Vision and Pattern Recognition · Computer Science 2023-12-12 Guglielmo Camporese , Alessandro Bergamo , Xunyu Lin , Joseph Tighe , Davide Modolo

Although action recognition systems can achieve top performance when evaluated on in-distribution test points, they are vulnerable to unanticipated distribution shifts in test data. However, test-time adaptation of video action recognition…

Computer Vision and Pattern Recognition · Computer Science 2023-03-22 Wei Lin , Muhammad Jehanzeb Mirza , Mateusz Kozinski , Horst Possegger , Hilde Kuehne , Horst Bischof

This paper presents a novel approach for automatic recognition of human activities for video surveillance applications. We propose to represent an activity by a combination of category components, and demonstrate that this approach offers…

Computer Vision and Pattern Recognition · Computer Science 2015-03-03 Weiyao Lin , Ming-Ting Sun , Radha Poovendran , Zhengyou Zhang

This paper presents the first-rank solution for the Multi-Modal Action Recognition Challenge, part of the Multi-Modal Visual Pattern Recognition Workshop at the \acl{ICPR} 2024. The competition aimed to recognize human actions using a…

Computer Vision and Pattern Recognition · Computer Science 2025-02-11 Anh-Kiet Duong , Petra Gomez-Krämer

Recognition in planning seeks to find agent intentions, goals or activities given a set of observations and a knowledge library (e.g. goal states, plans or domain theories). In this work we introduce the problem of Online Action…

Artificial Intelligence · Computer Science 2021-08-04 Alejandro Suárez-Hernández , Javier Segovia-Aguas , Carme Torras , Guillem Alenyà

Human doing actions will result in WiFi distortion, which is widely explored for action recognition, such as the elderly fallen detection, hand sign language recognition, and keystroke estimation. As our best survey, past work recognizes…

Signal Processing · Electrical Eng. & Systems 2019-04-29 Fei Wang , Yunpeng Song , Jimuyang Zhang , Jinsong Han , Dong Huang

Fine-grained action recognition is attracting increasing attention due to the emerging demand of specific action understanding in real-world applications, whereas the data of rare fine-grained categories is very limited. Therefore, we…

Computer Vision and Pattern Recognition · Computer Science 2021-08-17 Jiahao Wang , Yunhong Wang , Sheng Liu , Annan Li

In this paper we propose a novel approach to multi-action recognition that performs joint segmentation and classification. This approach models each action using a Gaussian mixture using robust low-dimensional action features. Segmentation…

Computer Vision and Pattern Recognition · Computer Science 2015-02-09 Johanna Carvajal , Conrad Sanderson , Chris McCool , Brian C. Lovell

In the few-shot scenario, a learner must effectively generalize to unseen classes given a small support set of labeled examples. While a relatively large amount of research has gone into few-shot learning for image classification, little…

Computer Vision and Pattern Recognition · Computer Science 2019-09-23 Chris Careaga , Brian Hutchinson , Nathan Hodas , Lawrence Phillips

Deep learning has revolutionized object detection thanks to large-scale datasets, but their object categories are still arguably very limited. In this paper, we attempt to enrich such categories by addressing the one-shot object detection…

Computer Vision and Pattern Recognition · Computer Science 2020-05-11 Xiang Li , Lin Zhang , Yau Pun Chen , Yu-Wing Tai , Chi-Keung Tang

This paper investigates the problem of zero-shot action recognition, in the setting where no training videos with seen actions are available. For this challenging scenario, the current leading approach is to transfer knowledge from the…

Computer Vision and Pattern Recognition · Computer Science 2021-10-27 Carlo Bretti , Pascal Mettes

While many action recognition techniques have great success on public benchmarks, such performance is not necessarily replicated in real-world scenarios, where the data comes from specific application requirements. The specific real-world…

Computer Vision and Pattern Recognition · Computer Science 2021-11-29 Saif Sayed , Vassilis Athitsos

Few-shot action recognition aims to recognize novel action classes using only a small number of labeled training samples. In this work, we propose a novel approach that first summarizes each video into compound prototypes consisting of a…

Computer Vision and Pattern Recognition · Computer Science 2023-10-17 Yifei Huang , Lijin Yang , Yoichi Sato

Multi-shot pedestrian re-identification problem is at the core of surveillance video analysis. It matches two tracks of pedestrians from different cameras. In contrary to existing works that aggregate single frames features by time series…

Computer Vision and Pattern Recognition · Computer Science 2018-05-10 Jianfu Zhang , Naiyan Wang , Liqing Zhang

In this study, we propose a method for single sensor-based activity recognition, trained with data from multiple sensors. There is no doubt that the performance of complex activity recognition systems increases when we use enough sensors…

Human-Computer Interaction · Computer Science 2020-02-27 Paula Lago , Moe Matsuki , Sozo Inoue

Continuous action recognition is more challenging than isolated recognition because classification and segmentation must be simultaneously carried out. We build on the well known dynamic time warping (DTW) framework and devise a novel…

Computer Vision and Pattern Recognition · Computer Science 2015-03-30 Kaustubh Kulkarni , Georgios Evangelidis , Jan Cech , Radu Horaud

State-of-the-art temporal action detectors inefficiently search the entire video for specific actions. Despite the encouraging progress these methods achieve, it is crucial to design automated approaches that only explore parts of the video…

Computer Vision and Pattern Recognition · Computer Science 2018-07-30 Humam Alwassel , Fabian Caba Heilbron , Bernard Ghanem

Human action understanding is a fundamental and challenging task in computer vision. Although there exists tremendous research on this area, most works focus on action recognition, while action retrieval has received less attention. In this…

Computer Vision and Pattern Recognition · Computer Science 2024-07-30 Hongsong Wang , Jianhua Zhao , Jie Gui