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Anomaly detection in videos has been attracting an increasing amount of attention. Despite the competitive performance of recent methods on benchmark datasets, they typically lack desirable features such as modularity, cross-domain…

Computer Vision and Pattern Recognition · Computer Science 2021-03-23 Keval Doshi , Yasin Yilmaz

Weakly-Supervised Video Anomaly Detection aims to identify anomalous events using only video-level labels, balancing annotation efficiency with practical applicability. However, existing methods often oversimplify the anomaly space by…

Computer Vision and Pattern Recognition · Computer Science 2025-12-30 Junhee Lee , ChaeBeen Bang , MyoungChul Kim , MyeongAh Cho

Video anomaly detection (VAD) mainly refers to identifying anomalous events that have not occurred in the training set where only normal samples are available. Existing works usually formulate VAD as a reconstruction or prediction problem.…

Computer Vision and Pattern Recognition · Computer Science 2021-11-17 Yue Lu , Congqi Cao , Yanning Zhang

Video anomaly detection (VAD) addresses the problem of automatically finding anomalous events in video data. The primary data modalities on which current VAD systems work on are monochrome or RGB images. Using depth data in this context…

Computer Vision and Pattern Recognition · Computer Science 2022-04-13 Pascal Schneider , Jason Rambach , Bruno Mirbach , Didier Stricker

Video Anomaly Detection (VAD) aims to locate unusual activities or behaviors within videos. Recently, offline VAD has garnered substantial research attention, which has been invigorated by the progress in large language models (LLMs) and…

Computer Vision and Pattern Recognition · Computer Science 2025-10-27 Shengtian Yang , Yue Feng , Yingshi Liu , Jingrou Zhang , Jie Qin

The rapid advancements in large language models (LLMs) have spurred growing interest in LLM-based video anomaly detection (VAD). However, existing approaches predominantly focus on video-level anomaly question answering or offline…

Computer Vision and Pattern Recognition · Computer Science 2025-03-31 Zhiwei Yang , Chen Gao , Jing Liu , Peng Wu , Guansong Pang , Mike Zheng Shou

Open-world video anomaly detection (OWVAD) aims to detect and explain abnormal events under different anomaly definitions, which is important for applications such as intelligent surveillance and live-streaming content moderation. Recent…

Computer Vision and Pattern Recognition · Computer Science 2026-04-10 Zihao Liu , Xiaoyu Wu , Wenna Li , Jianqin Wu , Linlin Yang

Video anomaly detection (VAD) remains a challenging task in the pattern recognition community due to the ambiguity and diversity of abnormal events. Existing deep learning-based VAD methods usually leverage proxy tasks to learn the normal…

Computer Vision and Pattern Recognition · Computer Science 2022-11-03 Mengyang Zhao , Yang Liu , Jing Li , Xinhua Zeng

Video Anomaly Detection (VAD) aims to identify anomalous events in videos and accurately determine their time intervals. Current VAD methods mainly fall into two categories: traditional DNN-based approaches that focus on temporal…

Computer Vision and Pattern Recognition · Computer Science 2025-07-30 Shibo Gao , Peipei Yang , Yangyang Liu , Yi Chen , Han Zhu , Xuyao Zhang , Linlin Huang

Most cross-domain unsupervised Video Anomaly Detection (VAD) works assume that at least few task-relevant target domain training data are available for adaptation from the source to the target domain. However, this requires laborious…

Computer Vision and Pattern Recognition · Computer Science 2022-12-15 Abhishek Aich , Kuan-Chuan Peng , Amit K. Roy-Chowdhury

Zero-shot anomaly detection (ZSAD) recognizes and localizes anomalies in previously unseen objects by establishing feature mapping between textual prompts and inspection images, demonstrating excellent research value in flexible industrial…

Computer Vision and Pattern Recognition · Computer Science 2026-04-02 Huilin Deng , Hongchen Luo , Wei Zhai , Yang Cao , Yu Kang

Anomaly detection has attracted considerable search attention. However, existing anomaly detection databases encounter two major problems. Firstly, they are limited in scale. Secondly, training sets contain only video-level labels…

Computer Vision and Pattern Recognition · Computer Science 2021-06-17 Boyang Wan , Wenhui Jiang , Yuming Fang , Zhiyuan Luo , Guanqun Ding

Video anomaly detection (VAD) plays a critical role in public safety applications such as intelligent surveillance. However, the rarity, unpredictability, and high annotation cost of real-world anomalies make it difficult to scale VAD…

Computer Vision and Pattern Recognition · Computer Science 2025-08-04 Suhang Cai , Xiaohao Peng , Chong Wang , Xiaojie Cai , Jiangbo Qian

Understanding abnormal events in videos is a vital and challenging task that has garnered significant attention in a wide range of applications. Although current video understanding Multi-modal Large Language Models (MLLMs) are capable of…

Computer Vision and Pattern Recognition · Computer Science 2025-11-04 Yingxian Chen , Jiahui Liu , Ruidi Fan , Yanwei Li , Chirui Chang , Shizhen Zhao , Wilton W. T. Fok , Xiaojuan Qi , Yik-Chung Wu

Recent advancements in reasoning capability of Multimodal Large Language Models (MLLMs) demonstrate its effectiveness in tackling complex visual tasks. However, existing MLLM-based Video Anomaly Detection (VAD) methods remain limited to…

Computer Vision and Pattern Recognition · Computer Science 2025-05-27 Chao Huang , Benfeng Wang , Jie Wen , Chengliang Liu , Wei Wang , Li Shen , Xiaochun Cao

Vision-language models (VLMs) have recently emerged as a promising paradigm for video anomaly detection (VAD) due to their strong visual reasoning ability and natural language-based explainability. In this paper, we aim to address a key…

Computer Vision and Pattern Recognition · Computer Science 2026-05-15 Mitchell Piehl , Muchao Ye

Video anomaly understanding (VAU) aims to provide detailed interpretation and semantic comprehension of anomalous events within videos, addressing limitations of traditional methods that focus solely on detecting and localizing anomalies.…

Computer Vision and Pattern Recognition · Computer Science 2025-12-15 Ying Cheng , Yu-Ho Lin , Min-Hung Chen , Fu-En Yang , Shang-Hong Lai

Recent progress in reasoning capabilities of Multimodal Large Language Models(MLLMs) has highlighted their potential for performing complex video understanding tasks. However, in the domain of Video Anomaly Detection and Understanding…

Computer Vision and Pattern Recognition · Computer Science 2026-01-16 Chao Huang , Benfeng Wang , Wei Wang , Jie Wen , Li Shen , Wenqi Ren , Yong Xu , Xiaochun Cao

Video Anomaly Detection(VAD) has been traditionally tackled in two main methodologies: the reconstruction-based approach and the prediction-based one. As the reconstruction-based methods learn to generalize the input image, the model merely…

Computer Vision and Pattern Recognition · Computer Science 2022-06-20 Joo-Yeon Lee , Woo-Jeoung Nam , Seong-Whan Lee

Recent video anomaly detection research has expanded rapidly with an emphasis on general models of normality intended to work across many different scenes. While this focus has led to improvements in scalability and multi-scene…

Computer Vision and Pattern Recognition · Computer Science 2026-05-14 Furkan Mumcu , Michael J. Jones , Anoop Cherian , Yasin Yilmaz