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We address temporal action localization in untrimmed long videos. This is important because videos in real applications are usually unconstrained and contain multiple action instances plus video content of background scenes or other…

Computer Vision and Pattern Recognition · Computer Science 2016-04-25 Zheng Shou , Dongang Wang , Shih-Fu Chang

Temporal action detection (TAD) aims to determine the semantic label and the temporal interval of every action instance in an untrimmed video. It is a fundamental and challenging task in video understanding. Previous methods tackle this…

Computer Vision and Pattern Recognition · Computer Science 2022-08-12 Xiaolong Liu , Qimeng Wang , Yao Hu , Xu Tang , Shiwei Zhang , Song Bai , Xiang Bai

Temporal action detection (TAD) aims to detect the semantic labels and boundaries of action instances in untrimmed videos. Current mainstream approaches are multi-step solutions, which fall short in efficiency and flexibility. In this…

Computer Vision and Pattern Recognition · Computer Science 2022-04-07 Shimin Chen , Chen Chen , Wei Li , Xunqiang Tao , Yandong Guo

Temporal action localization has recently attracted significant interest in the Computer Vision community. However, despite the great progress, it is hard to identify which aspects of the proposed methods contribute most to the increase in…

Computer Vision and Pattern Recognition · Computer Science 2019-05-30 Tingting Xie , Xiaoshan Yang , Tianzhu Zhang , Changsheng Xu , Ioannis Patras

Temporal action localization (TAL) requires long-form reasoning to predict actions of various durations and complex content. Given limited GPU memory, training TAL end to end (i.e., from videos to predictions) on long videos is a…

Computer Vision and Pattern Recognition · Computer Science 2023-03-29 Chen Zhao , Shuming Liu , Karttikeya Mangalam , Bernard Ghanem

Temporal action detection aims at not only recognizing action category but also detecting start time and end time for each action instance in an untrimmed video. The key challenge of this task is to accurately classify the action and…

Computer Vision and Pattern Recognition · Computer Science 2018-10-22 Wen Wang , Yongjian Wu , Haijun Liu , Shiguang Wang , Jian Cheng

Locating actions in long untrimmed videos has been a challenging problem in video content analysis. The performances of existing action localization approaches remain unsatisfactory in precisely determining the beginning and the end of an…

Computer Vision and Pattern Recognition · Computer Science 2018-06-27 Haonan Qiu , Yingbin Zheng , Hao Ye , Yao Lu , Feng Wang , Liang He

This paper focuses on temporal localization of actions in untrimmed videos. Existing methods typically train classifiers for a pre-defined list of actions and apply them in a sliding window fashion. However, activities in the wild consist…

Computer Vision and Pattern Recognition · Computer Science 2017-08-07 Jiyang Gao , Chen Sun , Zhenheng Yang , Ram Nevatia

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 Detection(TAD) is a crucial but challenging task in video understanding.It is aimed at detecting both the type and start-end frame for each action instance in a long, untrimmed video.Most current models adopt both RGB and…

Computer Vision and Pattern Recognition · Computer Science 2024-02-05 Bowen Deng , Dongchang Liu

Temporal action localization is a recently-emerging task, aiming to localize video segments from untrimmed videos that contain specific actions. Despite the remarkable recent progress, most two-stage action localization methods still suffer…

Computer Vision and Pattern Recognition · Computer Science 2019-08-05 Guoqiang Gong , Liangfeng Zheng , Kun Bai , Yadong Mu

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

Temporally localizing actions in a video is a fundamental challenge in video understanding. Most existing approaches have often drawn inspiration from image object detection and extended the advances, e.g., SSD and Faster R-CNN, to produce…

Computer Vision and Pattern Recognition · Computer Science 2019-09-10 Fuchen Long , Ting Yao , Zhaofan Qiu , Xinmei Tian , Jiebo Luo , Tao Mei

This paper addresses the challenges of fault prediction and delayed response in distributed systems by proposing an intelligent prediction method based on temporal feature learning. The method takes multi-dimensional performance metric…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-05-28 Yang Wang , Wenxuan Zhu , Xuehui Quan , Heyi Wang , Chang Liu , Qiyuan Wu

Temporal action detection (TAD) aims to locate and recognize the actions in an untrimmed video. Anchor-free methods have made remarkable progress which mainly formulate TAD into two tasks: classification and localization using two separate…

Computer Vision and Pattern Recognition · Computer Science 2022-11-22 Junshan Hu , Chaoxu guo , Liansheng Zhuang , Biao Wang , Tiezheng Ge , Yuning Jiang , Houqiang Li

Existing Temporal Action Detection (TAD) methods typically take a pre-processing step in converting an input varying-length video into a fixed-length snippet representation sequence, before temporal boundary estimation and action…

Computer Vision and Pattern Recognition · Computer Science 2023-03-06 Sauradip Nag , Xiatian Zhu , Yi-Zhe Song , Tao Xiang

State of the art architectures for untrimmed video Temporal Action Localization (TAL) have only considered RGB and Flow modalities, leaving the information-rich audio modality totally unexploited. Audio fusion has been explored for the…

Computer Vision and Pattern Recognition · Computer Science 2021-10-19 Anurag Bagchi , Jazib Mahmood , Dolton Fernandes , Ravi Kiran Sarvadevabhatla

Temporal Action Detection (TAD), the task of localizing and classifying actions in untrimmed video, remains challenging due to action overlaps and variable action durations. Recent findings suggest that TAD performance is dependent on the…

Computer Vision and Pattern Recognition · Computer Science 2024-09-09 Aglind Reka , Diana Laura Borza , Dominick Reilly , Michal Balazia , Francois Bremond

Temporal representation is the cornerstone of modern action detection techniques. State-of-the-art methods mostly rely on a dense anchoring scheme, where anchors are sampled uniformly over the temporal domain with a discretized grid, and…

Computer Vision and Pattern Recognition · Computer Science 2022-03-15 Qiang Wang , Yanhao Zhang , Yun Zheng , Pan Pan

In the task of temporal action localization of ActivityNet-1.3 datasets, we propose to locate the temporal boundaries of each action and predict action class in untrimmed videos. We first apply VideoSwinTransformer as feature extractor to…

Computer Vision and Pattern Recognition · Computer Science 2024-11-05 Shimin Chen , Wei Li , Jianyang Gu , Chen Chen , Yandong Guo