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Online Temporal Action Localization (On-TAL) aims to detect the occurrence time and category of actions in untrimmed streaming videos immediately upon their completion. Recent advancements in this field focus on developing more…

Computer Vision and Pattern Recognition · Computer Science 2026-05-12 Chaolei Han , Hongsong Wang , Xin Gong , Jie Gui

Online temporal action localization (On-TAL) is the task of identifying multiple action instances given a streaming video. Since existing methods take as input only a video segment of fixed size per iteration, they are limited in…

Computer Vision and Pattern Recognition · Computer Science 2024-08-07 Youngkil Song , Dongkeun Kim , Minsu Cho , Suha Kwak

Temporal action localization (TAL) is a task of identifying a set of actions in a video, which involves localizing the start and end frames and classifying each action instance. Existing methods have addressed this task by using predefined…

Computer Vision and Pattern Recognition · Computer Science 2022-07-22 Tae-Kyung Kang , Gun-Hee Lee , Seong-Whan Lee

Online video understanding often relies on individual frames, leading to frame-by-frame predictions. Recent advancements such as Online Temporal Action Localization (OnTAL), extend this approach to instance-level predictions. However,…

Computer Vision and Pattern Recognition · Computer Science 2024-08-14 Sakib Reza , Yuexi Zhang , Mohsen Moghaddam , Octavia Camps

Online temporal action localization from an untrimmed video stream is a challenging problem in computer vision. It is challenging because of i) in an untrimmed video stream, more than one action instance may appear, including background…

Computer Vision and Pattern Recognition · Computer Science 2020-03-18 Da-Hye Yoon , Nam-Gyu Cho , Seong-Whan Lee

Online Temporal Action Localization (On-TAL) is a critical task that aims to instantaneously identify action instances in untrimmed streaming videos as soon as an action concludes -- a major leap from frame-based Online Action Detection…

Computer Vision and Pattern Recognition · Computer Science 2024-07-19 Hyolim Kang , Jeongseok Hyun , Joungbin An , Youngjae Yu , Seon Joo Kim

We propose TAL-Net, an improved approach to temporal action localization in video that is inspired by the Faster R-CNN object detection framework. TAL-Net addresses three key shortcomings of existing approaches: (1) we improve receptive…

Computer Vision and Pattern Recognition · Computer Science 2018-04-23 Yu-Wei Chao , Sudheendra Vijayanarasimhan , Bryan Seybold , David A. Ross , Jia Deng , Rahul Sukthankar

Most work on temporal action detection is formulated as an offline problem, in which the start and end times of actions are determined after the entire video is fully observed. However, important real-time applications including…

Computer Vision and Pattern Recognition · Computer Science 2019-03-26 Mingze Xu , Mingfei Gao , Yi-Ting Chen , Larry S. Davis , David J. Crandall

Temporal Action Localization (TAL) is a critical task in video analysis, identifying precise start and end times of actions. Existing methods like CNNs, RNNs, GCNs, and Transformers have limitations in capturing long-range dependencies and…

Computer Vision and Pattern Recognition · Computer Science 2024-07-19 Sangyoun Lee , Juho Jung , Changdae Oh , Sunghee Yun

Self-attention based Transformer models have demonstrated impressive results for image classification and object detection, and more recently for video understanding. Inspired by this success, we investigate the application of Transformer…

Computer Vision and Pattern Recognition · Computer Science 2022-08-30 Chenlin Zhang , Jianxin Wu , Yin Li

Existing temporal action localization (TAL) works rely on a large number of training videos with exhaustive segment-level annotation, preventing them from scaling to new classes. As a solution to this problem, few-shot TAL (FS-TAL) aims to…

Computer Vision and Pattern Recognition · Computer Science 2021-10-22 Sauradip Nag , Xiatian Zhu , Tao Xiang

Weakly-supervised Temporal Action Localization (WS-TAL) methods learn to localize temporal starts and ends of action instances in a video under only video-level supervision. Existing WS-TAL methods rely on deep features learned for action…

Computer Vision and Pattern Recognition · Computer Science 2021-03-31 Ziyi Liu , Le Wang , Wei Tang , Junsong Yuan , Nanning Zheng , Gang Hua

We introduce Activity Graph Transformer, an end-to-end learnable model for temporal action localization, that receives a video as input and directly predicts a set of action instances that appear in the video. Detecting and localizing…

Computer Vision and Pattern Recognition · Computer Science 2021-01-29 Megha Nawhal , Greg Mori

Weakly-supervised temporal action localization aims to recognize and localize action segments in untrimmed videos given only video-level action labels for training. Without the boundary information of action segments, existing methods…

Computer Vision and Pattern Recognition · Computer Science 2022-03-30 Bo He , Xitong Yang , Le Kang , Zhiyu Cheng , Xin Zhou , Abhinav Shrivastava

Point-Level temporal action localization (PTAL) aims to localize actions in untrimmed videos with only one timestamp annotation for each action instance. Existing methods adopt the frame-level prediction paradigm to learn from the sparse…

Computer Vision and Pattern Recognition · Computer Science 2020-12-16 Chen Ju , Peisen Zhao , Ya Zhang , Yanfeng Wang , Qi Tian

Nowadays, the interaction between humans and robots is constantly expanding, requiring more and more human motion recognition applications to operate in real time. However, most works on temporal action detection and recognition perform…

Computer Vision and Pattern Recognition · Computer Science 2021-06-29 Vasiliki I. Vasileiou , Nikolaos Kardaris , Petros Maragos

Inspired by the recent success of transformers and multi-stage architectures in video recognition and object detection domains. We thoroughly explore the rich spatio-temporal properties of transformers within a multi-stage architecture…

Computer Vision and Pattern Recognition · Computer Science 2025-07-21 Hayat Ullah , Arslan Munir , Oliver Nina

Temporal action localization (TAL), which involves recognizing and locating action instances, is a challenging task in video understanding. Most existing approaches directly predict action classes and regress offsets to boundaries, while…

Computer Vision and Pattern Recognition · Computer Science 2023-09-14 Jiayi Shao , Xiaohan Wang , Ruijie Quan , Junjun Zheng , Jiang Yang , Yi Yang

Temporal action localization is an important and challenging task that aims to locate temporal regions in real-world untrimmed videos where actions occur and recognize their classes. It is widely acknowledged that video context is a…

Computer Vision and Pattern Recognition · Computer Science 2021-03-10 Xin Qin , Hanbin Zhao , Guangchen Lin , Hao Zeng , Songcen Xu , Xi Li

Detecting actions in videos have been widely applied in on-device applications. Practical on-device videos are always untrimmed with both action and background. It is desirable for a model to both recognize the class of action and localize…

Computer Vision and Pattern Recognition · Computer Science 2022-08-29 Yue Tang , Yawen Wu , Peipei Zhou , Jingtong Hu
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