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Video Anomaly Detection (VAD) serves as a pivotal technology in the intelligent surveillance systems, enabling the temporal or spatial identification of anomalous events within videos. While existing reviews predominantly concentrate on…

Computer Vision and Pattern Recognition · Computer Science 2024-02-02 Yang Liu , Dingkang Yang , Yan Wang , Jing Liu , Jun Liu , Azzedine Boukerche , Peng Sun , Liang Song

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

Video Anomaly Detection (VAD) finds widespread applications in security surveillance, traffic monitoring, industrial monitoring, and healthcare. Despite extensive research efforts, there remains a lack of concise reviews that provide…

Computer Vision and Pattern Recognition · Computer Science 2024-11-01 Liyun Zhu , Lei Wang , Arjun Raj , Tom Gedeon , Chen Chen

Anomaly detection techniques enable effective anomaly detection and diagnosis in multi-variate time series data, which are of major significance for today's industrial applications. However, establishing an anomaly detection system that can…

Machine Learning · Computer Science 2024-05-02 Lingrui Yu

Mainstream unsupervised anomaly detection algorithms often excel in academic datasets, yet their real-world performance is restricted due to the controlled experimental conditions involving clean training data. Addressing the challenge of…

Machine Learning · Computer Science 2025-05-13 Thi Kieu Khanh Ho , Narges Armanfard

Time-series anomaly detection (TSAD) has played a vital role in a variety of fields, including healthcare, finance, and sensor-based condition monitoring. Prior methods, which mainly focus on training domain-specific models on numerical…

Computer Vision and Pattern Recognition · Computer Science 2025-11-26 Zelin He , Sarah Alnegheimish , Matthew Reimherr

Video anomaly detection (VAD) aims to identify and ground anomalous behaviors or events in videos, serving as a core technology in the fields of intelligent surveillance and public safety. With the advancement of deep learning, the…

Computer Vision and Pattern Recognition · Computer Science 2025-07-30 Shibo Gao , Peipei Yang , Haiyang Guo , Yangyang Liu , Yi Chen , Shuai Li , Han Zhu , Jian Xu , Xu-Yao Zhang , Linlin Huang

Time Series Anomaly Detection (TSAD) finds widespread applications across various domains such as financial markets, industrial production, and healthcare. Its primary objective is to learn the normal patterns of time series data, thereby…

Machine Learning · Computer Science 2024-07-01 Yutong Chen , Hongzuo Xu , Guansong Pang , Hezhe Qiao , Yuan Zhou , Mingsheng Shang

Time series anomaly detection (TSAD) is a critical task, but developing models that generalize to unseen data in a zero-shot manner remains a major challenge. Prevailing foundation models for TSAD predominantly rely on reconstruction-based…

Machine Learning · Computer Science 2026-05-29 Tian Lan , Hao Duong Le , Jinbo Li , Wenjun He , Meng Wang , Chenghao Liu , Chen Zhang

In recent studies, Lots of work has been done to solve time series anomaly detection by applying Variational Auto-Encoders (VAEs). Time series anomaly detection is a very common but challenging task in many industries, which plays an…

Machine Learning · Computer Science 2021-01-11 Liang Xu , Liying Zheng , Weijun Li , Zhenbo Chen , Weishun Song , Yue Deng , Yongzhe Chang , Jing Xiao , Bo Yuan

In anomaly detection (AD), one seeks to identify whether a test sample is abnormal, given a data set of normal samples. A recent and promising approach to AD relies on deep generative models, such as variational autoencoders (VAEs), for…

Machine Learning · Computer Science 2021-11-05 Tal Daniel , Thanard Kurutach , Aviv Tamar

Unsupervised visual anomaly detection from multi-view images presents a significant challenge: distinguishing genuine defects from benign appearance variations caused by viewpoint changes. Existing methods, often designed for single-view…

Computer Vision and Pattern Recognition · Computer Science 2025-11-25 Xintao Chen , Xiaohao Xu , Bozhong Zheng , Yun Liu , Yingna Wu

Status prediction and anomaly detection are two fundamental tasks in automatic IT systems monitoring. In this paper, a joint model Predictor & Anomaly Detector (PAD) is proposed to address these two issues under one framework. In our…

Machine Learning · Computer Science 2021-04-23 Run-Qing Chen , Guang-Hui Shi , Wan-Lei Zhao , Chang-Hui Liang

Time series anomaly detection (TSAD) focuses on identifying whether observations in streaming data deviate significantly from normal patterns. With the prevalence of connected devices, anomaly detection on time series has become paramount,…

Machine Learning · Computer Science 2025-06-11 Samy-Melwan Vilhes , Gilles Gasso , Mokhtar Z Alaya

Unsupervised visual anomaly detection conveys practical significance in many scenarios and is a challenging task due to the unbounded definition of anomalies. Moreover, most previous methods are application-specific, and establishing a…

Computer Vision and Pattern Recognition · Computer Science 2022-11-02 Haiming Yao , Xue Wang , Wenyong Yu

Recent advancements in time-series anomaly detection have relied on deep learning models to handle the diverse behaviors of time-series data. However, these models often suffer from unstable training and require extensive hyperparameter…

Machine Learning · Computer Science 2024-08-28 Nobuo Namura , Yuma Ichikawa

Visual Anomaly Detection (VAD) is a key task in industrial settings, where minimizing operational costs is essential. Deploying deep learning models within Internet of Things (IoT) environments introduces specific challenges due to limited…

Computer Vision and Pattern Recognition · Computer Science 2025-12-15 Arianna Stropeni , Francesco Borsatti , Manuel Barusco , Davide Dalle Pezze , Marco Fabris , Gian Antonio Susto

Time series anomaly detection (TSAD) is a vital yet challenging task, particularly in scenarios where labeled anomalies are scarce and temporal dependencies are complex. Recent anomaly assumption (AA) approaches alleviate the lack of…

Machine Learning · Computer Science 2025-09-09 Xudong Mou , Rui Wang , Tiejun Wang , Renyu Yang , Shiru Chen , Jie Sun , Tianyu Wo , Xudong Liu

Time series anomaly detection is a challenging problem due to the complex temporal dependencies and the limited label data. Although some algorithms including both traditional and deep models have been proposed, most of them mainly focus on…

Machine Learning · Computer Science 2023-03-28 Chaoli Zhang , Tian Zhou , Qingsong Wen , Liang Sun

The reliability of a machine vision system for autonomous driving depends heavily on its training data distribution. When a vehicle encounters significantly different conditions, such as atypical obstacles, its perceptual capabilities can…

Computer Vision and Pattern Recognition · Computer Science 2026-04-17 Fabrizio Genilotti , Arianna Stropeni , Gionata Grotto , Francesco Borsatti , Manuel Barusco , Davide Dalle Pezze , Gian Antonio Susto