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Anomaly detection in batch processes is hindered by transient dynamics, scarce fault labels, and reliance on single-modality sensor data. This work introduces UTOPYA (Unified Temporal Observation for Physics-Informed Anomaly Detection and…

Machine Learning · Computer Science 2026-05-19 Robson W. S. Pessoa , Julien Amblard , Alessandra Russo , Idelfonso B. R. Nogueira

Deep unsupervised approaches are gathering increased attention for applications such as pathology detection and segmentation in medical images since they promise to alleviate the need for large labeled datasets and are more generalizable…

Computer Vision and Pattern Recognition · Computer Science 2023-08-01 Ioannis Lagogiannis , Felix Meissen , Georgios Kaissis , Daniel Rueckert

In multi-class unsupervised anomaly detection(MUAD), reconstruction-based methods learn to map input images to normal patterns to identify anomalous pixels. However, this strategy easily falls into the well-known "learning shortcut" issue…

Computer Vision and Pattern Recognition · Computer Science 2025-03-31 Jiajie Quan , Ao Tong , Yuxuan Cai , Xinwei He , Yulong Wang , Yang Zhou

Anomaly detection is a challenging task that frequently arises in practically all areas of industry and science, from fraud detection and data quality monitoring to finding rare cases of diseases and searching for new physics. Most of the…

Machine Learning · Computer Science 2021-11-22 Artem Ryzhikov , Maxim Borisyak , Andrey Ustyuzhanin , Denis Derkach

This study explores the recently proposed and challenging multi-view Anomaly Detection (AD) task. Single-view tasks will encounter blind spots from other perspectives, resulting in inaccuracies in sample-level prediction. Therefore, we…

Computer Vision and Pattern Recognition · Computer Science 2025-08-12 Haoyang He , Jiangning Zhang , Guanzhong Tian , Chengjie Wang , Lei Xie

The rapid expansion of data from diverse sources has made anomaly detection (AD) increasingly essential for identifying unexpected observations that may signal system failures, security breaches, or fraud. As datasets become more complex…

Machine Learning · Computer Science 2025-03-18 Haoqi Huang , Ping Wang , Jianhua Pei , Jiacheng Wang , Shahen Alexanian , Dusit Niyato

Deep unsupervised representation learning has recently led to new approaches in the field of Unsupervised Anomaly Detection (UAD) in brain MRI. The main principle behind these works is to learn a model of normal anatomy by learning to…

Image and Video Processing · Electrical Eng. & Systems 2020-04-09 Christoph Baur , Stefan Denner , Benedikt Wiestler , Shadi Albarqouni , Nassir Navab

Anomaly detection is a critical task in computer vision with profound implications for medical imaging, where identifying pathologies early can directly impact patient outcomes. While recent unsupervised anomaly detection approaches show…

Computer Vision and Pattern Recognition · Computer Science 2026-03-03 Le Dong , Qinzhong Tan , Chunlei Li , Jingliang Hu , Yilei Shi , Weisheng Dong , Xiao Xiang Zhu , Lichao Mou

One-shot medical landmark detection gains much attention and achieves great success for its label-efficient training process. However, existing one-shot learning methods are highly specialized in a single domain and suffer domain preference…

Computer Vision and Pattern Recognition · Computer Science 2025-05-16 Heqin Zhu , Quan Quan , Qingsong Yao , Zaiyi Liu , S. Kevin Zhou

Dynamic graph anomaly detection (DGAD) is critical for many real-world applications but remains challenging due to the scarcity of labeled anomalies. Existing methods are either unsupervised or semi-supervised: unsupervised methods avoid…

Machine Learning · Computer Science 2026-02-24 Yuxing Tian , Yiyan Qi , Fengran Mo , Weixu Zhang , Jian Guo , Jian-Yun Nie

The built environment, encompassing critical infrastructure such as bridges and buildings, requires diligent monitoring of unexpected anomalies or deviations from a normal state in captured imagery. Anomaly detection methods could aid in…

Computer Vision and Pattern Recognition · Computer Science 2025-05-21 Subin Varghese , Vedhus Hoskere

Anomaly detection (AD) is often focused on detecting anomaly areas for industrial quality inspection and medical lesion examination. However, due to the specific scenario targets, the data scale for AD is relatively small, and evaluation…

Computer Vision and Pattern Recognition · Computer Science 2024-04-17 Jiangning Zhang , Chengjie Wang , Xiangtai Li , Guanzhong Tian , Zhucun Xue , Yong Liu , Guansong Pang , Dacheng Tao

Due to the intractability of characterizing everything that looks unlike the normal data, anomaly detection (AD) is traditionally treated as an unsupervised problem utilizing only normal samples. However, it has recently been found that…

Computer Vision and Pattern Recognition · Computer Science 2023-01-29 Philipp Liznerski , Lukas Ruff , Robert A. Vandermeulen , Billy Joe Franks , Klaus-Robert Müller , Marius Kloft

Unsupervised graph anomaly detection (GAD) has received increasing attention in recent years, which aims to identify data anomalous patterns utilizing only unlabeled node information from graph-structured data. However, prevailing…

Machine Learning · Computer Science 2025-11-14 Jiazhen Chen , Xiuqin Liang , Sichao Fu , Zheng Ma , Weihua Ou

Unsupervised anomaly detection (UAD) plays an important role in modern data analytics and it is crucial to provide simple yet effective and guaranteed UAD algorithms for real applications. In this paper, we present a novel UAD method for…

Machine Learning · Computer Science 2024-12-17 Wei Dai , Kai Hwang , Jicong Fan

Anomaly detection is crucial for understanding unusual behaviors in data, as anomalies offer valuable insights. This paper introduces Dependency-based Anomaly Detection (DepAD), a general framework that utilizes variable dependencies to…

Machine Learning · Computer Science 2024-04-18 Sha Lu , Lin Liu , Kui Yu , Thuc Duy Le , Jixue Liu , Jiuyong Li

In the advancement of industrial informatization, unsupervised anomaly detection technology effectively overcomes the scarcity of abnormal samples and significantly enhances the automation and reliability of smart manufacturing. As an…

Computer Vision and Pattern Recognition · Computer Science 2025-03-24 Yuxuan Lin , Yang Chang , Xuan Tong , Jiawen Yu , Antonio Liotta , Guofan Huang , Wei Song , Deyu Zeng , Zongze Wu , Yan Wang , Wenqiang Zhang

Developing an accurate and fast anomaly detection model is an important task in real-time computer vision applications. There has been much research to develop a single model that detects either structural or logical anomalies, which are…

Computer Vision and Pattern Recognition · Computer Science 2024-12-10 Shota Sugawara , Ryuji Imamura

Zero-shot 3D anomaly detection aims to identify anomalies without access to training data from target categories. However, existing methods mainly rely on projecting 3D observations into multi-view representations that primarily capture…

Computer Vision and Pattern Recognition · Computer Science 2026-05-08 Letian Bai , Xuanming Cao , Juan Du , Chengyu Tao

Unsupervised image Anomaly Detection (UAD) aims to learn robust and discriminative representations of normal samples. While separate solutions per class endow expensive computation and limited generalizability, this paper focuses on…

Computer Vision and Pattern Recognition · Computer Science 2023-10-24 Ruiying Lu , YuJie Wu , Long Tian , Dongsheng Wang , Bo Chen , Xiyang Liu , Ruimin Hu
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