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Weakly-Supervised Video Object Localization (WSVOL) involves localizing an object in videos using only video-level labels, also referred to as tags. State-of-the-art WSVOL methods like Temporal CAM (TCAM) rely on class activation mapping…

Computer Vision and Pattern Recognition · Computer Science 2024-07-09 Shakeeb Murtaza , Marco Pedersoli , Aydin Sarraf , Eric Granger

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

Weakly supervised object detection aims at reducing the amount of supervision required to train detection models. Such models are traditionally learned from images/videos labelled only with the object class and not the object bounding box.…

Computer Vision and Pattern Recognition · Computer Science 2019-04-04 Zhenheng Yang , Dhruv Mahajan , Deepti Ghadiyaram , Ram Nevatia , Vignesh Ramanathan

The spread of Deepfake videos has caused a trust crisis and impaired social stability. Although numerous approaches have been proposed to address the challenges of Deepfake detection and localization, there is still a lack of systematic…

Computer Vision and Pattern Recognition · Computer Science 2025-08-05 Wenbo Xu , Wei Lu , Xiangyang Luo

The present few-shot temporal action localization model can't handle the situation where videos contain multiple action instances. So the purpose of this paper is to achieve manifold action instances localization in a lengthy untrimmed…

Computer Vision and Pattern Recognition · Computer Science 2024-08-27 Fengshun Wang , Qiurui Wang , Yuting Wang

Weakly supervised instance segmentation reduces the cost of annotations required to train models. However, existing approaches which rely only on image-level class labels predominantly suffer from errors due to (a) partial segmentation of…

Computer Vision and Pattern Recognition · Computer Science 2021-03-25 Qing Liu , Vignesh Ramanathan , Dhruv Mahajan , Alan Yuille , Zhenheng Yang

We present a two-stage learning framework for weakly supervised object localization (WSOL). While most previous efforts rely on high-level feature based CAMs (Class Activation Maps), this paper proposes to localize objects using the…

Computer Vision and Pattern Recognition · Computer Science 2021-10-13 Jinheng Xie , Cheng Luo , Xiangping Zhu , Ziqi Jin , Weizeng Lu , Linlin Shen

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

Weakly-Supervised Dense Video Captioning aims to localize and describe events in videos trained only on caption annotations, without temporal boundaries. Prior work introduced an implicit supervision paradigm based on Gaussian masking and…

Computer Vision and Pattern Recognition · Computer Science 2026-03-10 Ye-Chan Kim , SeungJu Cha , Si-Woo Kim , Minju Jeon , Hyungee Kim , Dong-Jin Kim

Moving objects can greatly jeopardize the performance of a visual simultaneous localization and mapping (vSLAM) system which relies on the static-world assumption. Motion removal have seen successful on solving this problem. Two main…

Robotics · Computer Science 2019-08-01 Ting Sun , Yuxiang Sun , Ming Liu , Dit-Yan Yeung

Real-world videos often contain overlapping events and complex temporal dependencies, making multimodal interaction modeling particularly challenging. We introduce DEL, a framework for dense semantic action localization, aiming to…

Computer Vision and Pattern Recognition · Computer Science 2025-07-01 Mona Ahmadian , Amir Shirian , Frank Guerin , Andrew Gilbert

Despite the recent advances in video classification, progress in spatio-temporal action recognition has lagged behind. A major contributing factor has been the prohibitive cost of annotating videos frame-by-frame. In this paper, we present…

Computer Vision and Pattern Recognition · Computer Science 2020-07-22 Anurag Arnab , Chen Sun , Arsha Nagrani , Cordelia Schmid

Few-shot temporal action localization (TAL) methods that adapt large models via single-prompt tuning often fail to produce precise temporal boundaries. This stems from the model learning a non-discriminative mean representation of an action…

Computer Vision and Pattern Recognition · Computer Science 2025-07-25 Edward Fish , Andrew Gilbert

Current weakly supervised video anomaly detection (WSVAD) task aims to achieve frame-level anomalous event detection with only coarse video-level annotations available. Existing works typically involve extracting global features from…

Computer Vision and Pattern Recognition · Computer Science 2024-08-14 Peng Wu , Xuerong Zhou , Guansong Pang , Zhiwei Yang , Qingsen Yan , Peng Wang , Yanning Zhang

Feature matching across video streams remains a cornerstone challenge in computer vision. Increasingly, robust multimodal matching has garnered interest in robotics, surveillance, remote sensing, and medical imaging. While traditional rely…

Computer Vision and Pattern Recognition · Computer Science 2025-04-17 Jie Wang , Chen Ye Gan , Caoqi Wei , Jiangtao Wen , Yuxing Han

Online action detection in untrimmed videos aims to identify an action as it happens, which makes it very important for real-time applications. Previous methods rely on tedious annotations of temporal action boundaries for training, which…

Computer Vision and Pattern Recognition · Computer Science 2021-05-20 Mingfei Gao , Yingbo Zhou , Ran Xu , Richard Socher , Caiming Xiong

Multi-Object Tracking (MOT) in dynamic environments relies on robust temporal reasoning to maintain consistent object identities over time. Transformer-based end-to-end MOT models achieve strong performance by explicitly modeling temporal…

Computer Vision and Pattern Recognition · Computer Science 2026-05-12 Riku Inoue , Shogo Sato , Kazuhiko Murasaki , Tomoyasu Shimada , Toshihiko Nishimura , Ryuichi Tanida

Weakly-supervised Temporal Action Localization (WTAL) has achieved notable success but still suffers from a lack of temporal annotations, leading to a performance and framework gap compared with fully-supervised methods. While recent…

Computer Vision and Pattern Recognition · Computer Science 2025-04-22 Ziyi Liu , Yangcen Liu

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 detection is a Herculean task in understanding untrimmed videos, since no supervisory signal except the video-level category label is available on training data. Under the supervision of category labels,…

Computer Vision and Pattern Recognition · Computer Science 2018-07-19 Jia-Xing Zhong , Nannan Li , Weijie Kong , Tao Zhang , Thomas H. Li , Ge Li
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