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Spatio-temporal video grounding (STVG) aims at localizing the spatio-temporal tube of a video, as specified by the input text query. In this paper, we utilize multimodal large language models (MLLMs) to explore a zero-shot solution in STVG.…

Computer Vision and Pattern Recognition · Computer Science 2025-09-19 Zaiquan Yang , Yuhao Liu , Gerhard Hancke , Rynson W. H. Lau

Temporal action localization (TAL) is a fundamental yet challenging task in video understanding. Existing TAL methods rely on pre-training a video encoder through action classification supervision. This results in a task discrepancy problem…

Computer Vision and Pattern Recognition · Computer Science 2021-11-01 Mengmeng Xu , Juan-Manuel Perez-Rua , Xiatian Zhu , Bernard Ghanem , Brais Martinez

Weakly-supervised temporal action localization aims to identify and localize the action instances in the untrimmed videos with only video-level action labels. When humans watch videos, we can adapt our abstract-level knowledge about actions…

Computer Vision and Pattern Recognition · Computer Science 2023-12-27 Xijun Wang , Aggelos K. Katsaggelos

Recent breakthroughs in Multimodal Large Language Models (MLLMs) have gained significant recognition within the deep learning community, where the fusion of the Video Foundation Models (VFMs) and Large Language Models(LLMs) has proven…

Computer Vision and Pattern Recognition · Computer Science 2025-06-10 Quan Zhang , Jinwei Fang , Rui Yuan , Xi Tang , Yuxin Qi , Ke Zhang , Chun Yuan

We address the problem of temporal action localization in videos. We pose action localization as a structured prediction over arbitrary-length temporal windows, where each window is scored as the sum of frame-wise classification scores.…

Computer Vision and Pattern Recognition · Computer Science 2017-04-18 Zehuan Yuan , Jonathan C. Stroud , Tong Lu , Jia Deng

Weakly-supervised temporal action localization (WTAL) learns to detect and classify action instances with only category labels. Most methods widely adopt the off-the-shelf Classification-Based Pre-training (CBP) to generate video features…

Computer Vision and Pattern Recognition · Computer Science 2022-12-20 Chen Ju , Kunhao Zheng , Jinxiang Liu , Peisen Zhao , Ya Zhang , Jianlong Chang , Yanfeng Wang , Qi Tian

Recently, Weakly-supervised Temporal Action Localization (WTAL) has been densely studied but there is still a large gap between weakly-supervised models and fully-supervised models. It is practical and intuitive to annotate temporal…

Computer Vision and Pattern Recognition · Computer Science 2020-03-24 Xudong Lin , Zheng Shou , Shih-Fu Chang

Temporal Action Localization (TAL) involves localizing and classifying action snippets in an untrimmed video. The emergence of large video foundation models has led RGB-only video backbones to outperform previous methods needing both RGB…

Computer Vision and Pattern Recognition · Computer Science 2024-12-06 Akshita Gupta , Gaurav Mittal , Ahmed Magooda , Ye Yu , Graham W. Taylor , Mei Chen

This paper addresses spatio-temporal localization of human actions in video. In order to localize actions in time, we propose a recurrent localization network (RecLNet) designed to model the temporal structure of actions on the level of…

Computer Vision and Pattern Recognition · Computer Science 2018-06-29 Guilhem Chéron , Anton Osokin , Ivan Laptev , Cordelia Schmid

Dense video captioning, a task of localizing meaningful moments and generating relevant captions for videos, often requires a large, expensive corpus of annotated video segments paired with text. In an effort to minimize the annotation…

Computer Vision and Pattern Recognition · Computer Science 2023-07-13 Yongrae Jo , Seongyun Lee , Aiden SJ Lee , Hyunji Lee , Hanseok Oh , Minjoon Seo

Semantic segmentation is a crucial task in computer vision that involves segmenting images into semantically meaningful regions at the pixel level. However, existing approaches often rely on expensive human annotations as supervision for…

Computer Vision and Pattern Recognition · Computer Science 2023-06-02 Jun Chen , Deyao Zhu , Guocheng Qian , Bernard Ghanem , Zhicheng Yan , Chenchen Zhu , Fanyi Xiao , Mohamed Elhoseiny , Sean Chang Culatana

Given an untrimmed video and a language query depicting a specific temporal moment in the video, video grounding aims to localize the time interval by understanding the text and video simultaneously. One of the most challenging issues is an…

Computer Vision and Pattern Recognition · Computer Science 2022-10-25 Dahye Kim , Jungin Park , Jiyoung Lee , Seongheon Park , Kwanghoon Sohn

Trained on large datasets, deep learning (DL) can accurately classify videos into hundreds of diverse classes. However, video data is expensive to annotate. Zero-shot learning (ZSL) proposes one solution to this problem. ZSL trains a model…

Computer Vision and Pattern Recognition · Computer Science 2020-06-23 Biagio Brattoli , Joseph Tighe , Fedor Zhdanov , Pietro Perona , Krzysztof Chalupka

Temporal action localization plays an important role in video analysis, which aims to localize and classify actions in untrimmed videos. The previous methods often predict actions on a feature space of a single-temporal scale. However, the…

Computer Vision and Pattern Recognition · Computer Science 2022-08-17 Zan Gao , Xinglei Cui , Tao Zhuo , Zhiyong Cheng , An-An Liu , Meng Wang , Shenyong Chen

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

The growing number of action classes has posed a new challenge for video understanding, making Zero-Shot Action Recognition (ZSAR) a thriving direction. The ZSAR task aims to recognize target (unseen) actions without training examples by…

Computer Vision and Pattern Recognition · Computer Science 2021-08-20 Shizhe Chen , Dong Huang

Zero-shot skeleton-based action recognition aims to classify unseen skeleton-based human actions without prior exposure to such categories during training. This task is extremely challenging due to the difficulty in generalizing from known…

Computer Vision and Pattern Recognition · Computer Science 2025-07-25 Kai Zhou , Shuhai Zhang , Zeng You , Jinwu Hu , Mingkui Tan , Fei Liu

Temporal Action Detection (TAD) is an essential and challenging topic in video understanding, aiming to localize the temporal segments containing human action instances and predict the action categories. The previous works greatly rely upon…

Computer Vision and Pattern Recognition · Computer Science 2021-09-21 Jiannan Wu , Peize Sun , Shoufa Chen , Jiewen Yang , Zihao Qi , Lan Ma , Ping Luo

In this paper, we investigate a weakly-supervised object detection framework. Most existing frameworks focus on using static images to learn object detectors. However, these detectors often fail to generalize to videos because of the…

Computer Vision and Pattern Recognition · Computer Science 2017-08-03 Yuan Yuan , Xiaodan Liang , Xiaolong Wang , Dit-Yan Yeung , Abhinav Gupta

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