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Anomaly detection is a critical task across numerous domains and modalities, yet existing methods are often highly specialized, limiting their generalizability. These specialized models, tailored for specific anomaly types like textural…

Computer Vision and Pattern Recognition · Computer Science 2025-08-11 Zhaopeng Gu , Bingke Zhu , Guibo Zhu , Yingying Chen , Wei Ge , Ming Tang , Jinqiao Wang

Graph Anomaly Detection (GAD) aims to identify uncommon, deviated, or suspicious objects within graph-structured data. Existing methods generally focus on a single graph object type (node, edge, graph, etc.) and often overlook the inherent…

Machine Learning · Computer Science 2024-11-12 Yiqing Lin , Jianheng Tang , Chenyi Zi , H. Vicky Zhao , Yuan Yao , Jia Li

While recent anomaly detection (AD) methods have made substantial progress in recognizing abnormal patterns within specific domains, most of them are specialist models that are trained on large training samples from a specific target…

Computer Vision and Pattern Recognition · Computer Science 2026-04-07 Jiawen Zhu , Mengjia Niu , Guansong Pang

Unsupervised anomaly detection (UAD) is a widely adopted approach in industry due to rare anomaly occurrences and data imbalance. A desirable characteristic of an UAD model is contained generalization ability which excels in the…

Computer Vision and Pattern Recognition · Computer Science 2023-08-29 YeongHyeon Park , Sungho Kang , Myung Jin Kim , Hyeonho Jeong , Hyunkyu Park , Hyeong Seok Kim , Juneho Yi

Most advanced unsupervised anomaly detection (UAD) methods rely on modeling feature representations of frozen encoder networks pre-trained on large-scale datasets, e.g. ImageNet. However, the features extracted from the encoders that are…

Computer Vision and Pattern Recognition · Computer Science 2023-10-25 Jia Guo , Shuai Lu , Lize Jia , Weihang Zhang , Huiqi Li

Many anomaly detection approaches, especially deep learning methods, have been recently developed to identify abnormal image morphology by only employing normal images during training. Unfortunately, many prior anomaly detection methods…

Medical anomaly detection (AD) is crucial for early clinical intervention, yet it faces challenges due to limited access to high-quality medical imaging data, caused by privacy concerns and data silos. Few-shot learning has emerged as a…

Computer Vision and Pattern Recognition · Computer Science 2025-05-23 Kaiyu Guo , Tan Pan , Chen Jiang , Zijian Wang , Brian C. Lovell , Limei Han , Yuan Cheng , Mahsa Baktashmotlagh

The practical deployment of Visual Anomaly Detection (VAD) systems is hindered by their sensitivity to real-world imaging variations, particularly the complex interplay between viewpoint and illumination which drastically alters defect…

Computer Vision and Pattern Recognition · Computer Science 2025-05-19 Yunkang Cao , Yuqi Cheng , Xiaohao Xu , Yiheng Zhang , Yihan Sun , Yuxiang Tan , Yuxin Zhang , Xiaonan Huang , Weiming Shen

While the mainstream research in anomaly detection has mainly followed the one-class classification, practical industrial environments often incur noisy training data due to annotation errors or lack of labels for new or refurbished…

Machine Learning · Computer Science 2024-11-26 Jiin Im , Yongho Son , Je Hyeong Hong

Visual anomaly detection in real-world industrial settings faces two major limitations. First, most existing methods are trained on purely normal data or on unlabeled datasets assumed to be predominantly normal, presuming the absence of…

Computer Vision and Pattern Recognition · Computer Science 2026-02-05 Anindya Sundar Das , Monowar Bhuyan

Human Action Anomaly Detection (HAAD) aims to identify anomalous actions given only normal action data during training. Existing methods typically follow a one-model-per-category paradigm, requiring separate training for each action…

Computer Vision and Pattern Recognition · Computer Science 2025-08-26 Koichiro Kamide , Shunsuke Sakai , Shun Maeda , Chunzhi Gu , Chao Zhang

This work studies a challenging and practical issue known as multi-class unsupervised anomaly detection (MUAD). This problem requires only normal images for training while simultaneously testing both normal and anomaly images across…

Computer Vision and Pattern Recognition · Computer Science 2024-08-13 Jiangning Zhang , Xuhai Chen , Yabiao Wang , Chengjie Wang , Yong Liu , Xiangtai Li , Ming-Hsuan Yang , Dacheng Tao

Anomaly detection is a long-standing challenge in manufacturing systems. Traditionally, anomaly detection has relied on human inspectors. However, 3D point clouds have gained attention due to their robustness to environmental factors and…

Computer Vision and Pattern Recognition · Computer Science 2024-11-12 Jiayu Liu , Shancong Mou , Nathan Gaw , Yinan Wang

Detecting anomalies in images and video is an essential task for multiple real-world problems, including industrial inspection, computer-assisted diagnosis, and environmental monitoring. Anomaly detection is typically formulated as a…

Computer Vision and Pattern Recognition · Computer Science 2026-03-24 Declan McIntosh , Alexandra Branzan Albu

Reconstruction-based anomaly detection models achieve their purpose by suppressing the generalization ability for anomaly. However, diverse normal patterns are consequently not well reconstructed as well. Although some efforts have been…

Computer Vision and Pattern Recognition · Computer Science 2023-03-10 Wenrui Liu , Hong Chang , Bingpeng Ma , Shiguang Shan , Xilin Chen

Industrial anomaly detection for 2D objects has gained significant attention and achieved progress in anomaly detection (AD) methods. However, identifying 3D depth anomalies using only 2D information is insufficient. Despite explicitly…

Computer Vision and Pattern Recognition · Computer Science 2025-07-28 An Xiang , Zixuan Huang , Xitong Gao , Kejiang Ye , Cheng-zhong Xu

The application of deep learning in visual anomaly detection has gained widespread popularity due to its potential use in quality control and manufacturing. Current standard methods are Unsupervised, where a clean dataset is utilised to…

Computer Vision and Pattern Recognition · Computer Science 2024-10-04 Shaurya Gupta , Neil Gautam , Anurag Malyala

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

Object anomaly detection is essential for industrial quality inspection, yet traditional single-sensor methods face critical limitations. They fail to capture the wide range of anomaly types, as single sensors are often constrained to…

Computer Vision and Pattern Recognition · Computer Science 2024-12-20 Wenqiao Li , Bozhong Zheng , Xiaohao Xu , Jinye Gan , Fading Lu , Xiang Li , Na Ni , Zheng Tian , Xiaonan Huang , Shenghua Gao , Yingna Wu

Unsupervised anomaly detection (UAD) attracts a lot of research interest and drives widespread applications, where only anomaly-free samples are available for training. Some UAD applications intend to further locate the anomalous regions…

Computer Vision and Pattern Recognition · Computer Science 2023-08-30 Yixuan Zhou , Xing Xu , Jingkuan Song , Fumin Shen , Heng Tao Shen