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Weakly supervised temporal action localization (WTAL) aims to detect action instances in untrimmed videos using only video-level annotations. Since many existing works optimize WTAL models based on action classification labels, they…

Computer Vision and Pattern Recognition · Computer Science 2024-08-13 Geuntaek Lim , Hyunwoo Kim , Joonsoo Kim , Yukyung Choi

Temporal action proposal generation aims to estimate temporal intervals of actions in untrimmed videos, which is a challenging yet important task in the video understanding field. The proposals generated by current methods still suffer from…

Computer Vision and Pattern Recognition · Computer Science 2021-03-25 Zhiwu Qing , Haisheng Su , Weihao Gan , Dongliang Wang , Wei Wu , Xiang Wang , Yu Qiao , Junjie Yan , Changxin Gao , Nong Sang

Temporal Action Localization (TAL) in untrimmed video is important for many applications. But it is very expensive to annotate the segment-level ground truth (action class and temporal boundary). This raises the interest of addressing TAL…

Computer Vision and Pattern Recognition · Computer Science 2018-12-18 Zheng Shou , Hang Gao , Lei Zhang , Kazuyuki Miyazawa , Shih-Fu Chang

As of today, state-of-the-art activity recognition from wearable sensors relies on algorithms being trained to classify fixed windows of data. In contrast, video-based Human Activity Recognition, known as Temporal Action Localization (TAL),…

Machine Learning · Computer Science 2024-10-15 Marius Bock , Michael Moeller , Kristof Van Laerhoven

Temporal Action Localization (TAL) remains a fundamental challenge in video understanding, aiming to identify the start time, end time, and category of all action instances within untrimmed videos. While recent single-stage, anchor-free…

Computer Vision and Pattern Recognition · Computer Science 2025-12-02 Thisara Rathnayaka , Uthayasanker Thayasivam

Many video analysis tasks require temporal localization thus detection of content changes. However, most existing models developed for these tasks are pre-trained on general video action classification tasks. This is because large scale…

Computer Vision and Pattern Recognition · Computer Science 2021-03-29 Mengmeng Xu , Juan-Manuel Perez-Rua , Victor Escorcia , Brais Martinez , Xiatian Zhu , Li Zhang , Bernard Ghanem , Tao Xiang

Weakly-supervised temporal action localization aims to learn detecting temporal intervals of action classes with only video-level labels. To this end, it is crucial to separate frames of action classes from the background frames (i.e.,…

Computer Vision and Pattern Recognition · Computer Science 2020-12-18 Pilhyeon Lee , Jinglu Wang , Yan Lu , Hyeran Byun

Despite tremendous progress achieved in temporal action detection, state-of-the-art methods still suffer from the sharp performance deterioration when localizing the starting and ending temporal action boundaries. Although most methods…

Computer Vision and Pattern Recognition · Computer Science 2019-12-17 Weijie Kong , Nannan Li , Shan Liu , Thomas Li , Ge Li

Temporal Action Localization (TAL) requires identifying both the boundaries and categories of actions in untrimmed videos. While vision-language models (VLMs) offer rich semantics to complement visual evidence, existing approaches tend to…

Computer Vision and Pattern Recognition · Computer Science 2026-04-14 Jiaqi Li , Guangming Wang , Shuntian Zheng , Minzhe Ni , Xiaoman Lu , Guanghui Ye , Yu Guan

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

Temporal action proposal generation (TAPG) is a challenging task, which requires localizing action intervals in an untrimmed video. Intuitively, we as humans, perceive an action through the interactions between actors, relevant objects, and…

Computer Vision and Pattern Recognition · Computer Science 2022-10-07 Khoa Vo , Sang Truong , Kashu Yamazaki , Bhiksha Raj , Minh-Triet Tran , Ngan Le

Weakly-supervised temporal action localization aims to localize and recognize actions in untrimmed videos with only video-level category labels during training. Without instance-level annotations, most existing methods follow the…

Computer Vision and Pattern Recognition · Computer Science 2023-05-30 Huan Ren , Wenfei Yang , Tianzhu Zhang , Yongdong Zhang

We present our solution to the BinEgo-360 Challenge at ICCV 2025, which focuses on temporal action localization (TAL) in multi-perspective and multi-modal video settings. The challenge provides a dataset containing panoramic, third-person,…

Computer Vision and Pattern Recognition · Computer Science 2025-12-15 Anh-Kiet Duong , Petra Gomez-Krämer

The crux of semi-supervised temporal action localization (SS-TAL) lies in excavating valuable information from abundant unlabeled videos. However, current approaches predominantly focus on building models that are robust to the error-prone…

Computer Vision and Pattern Recognition · Computer Science 2024-03-19 Kun Xia , Le Wang , Sanping Zhou , Gang Hua , Wei Tang

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

The task of temporally grounding language queries in videos is to temporally localize the best matched video segment corresponding to a given language (sentence). It requires certain models to simultaneously perform visual and linguistic…

Computer Vision and Pattern Recognition · Computer Science 2019-12-19 Jingwen Wang , Lin Ma , Wenhao Jiang

Temporal Action Localization (TAL) has garnered significant attention in information retrieval. Existing supervised or weakly supervised methods heavily rely on labeled temporal boundaries and action categories, which are labor-intensive…

Computer Vision and Pattern Recognition · Computer Science 2025-06-06 Rui Xia , Dan Jiang , Quan Zhang , Ke Zhang , Chun Yuan

Temporal Action Proposal (TAP) generation is an important problem, as fast and accurate extraction of semantically important (e.g. human actions) segments from untrimmed videos is an important step for large-scale video analysis. We propose…

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

Temporal Action Localization (TAL) aims to identify actions' start, end, and class labels in untrimmed videos. While recent advancements using transformer networks and Feature Pyramid Networks (FPN) have enhanced visual feature recognition…

Computer Vision and Pattern Recognition · Computer Science 2023-10-06 Edward Fish , Jon Weinbren , Andrew Gilbert

Point-supervised Temporal Action Localization (PTAL) adopts a lightly frame-annotated paradigm (\textit{i.e.}, labeling only a single frame per action instance) to train a model to effectively locate action instances within untrimmed…

Computer Vision and Pattern Recognition · Computer Science 2026-02-06 Yunchuan Ma , Laiyun Qing , Guorong Li , Yuqing Liu , Yuankai Qi , Qingming Huang