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Video anomaly detection (VAD) has long been studied as a crucial problem in public security and crime prevention. In recent years, weakly-supervised VAD (WVAD) have attracted considerable attention due to their easy annotation process and…

Computer Vision and Pattern Recognition · Computer Science 2025-12-09 Satoshi Hashimoto , Tatsuya Konishi , Tomoya Kaichi , Kazunori Matsumoto , Mori Kurokawa

In this paper, we investigate algorithms for anomaly detection. Previous anomaly detection methods focus on modeling the distribution of non-anomalous data provided during training. However, this does not necessarily ensure the correct…

Machine Learning · Computer Science 2020-05-29 Ziyi Yang , Iman Soltani Bozchalooi , Eric Darve

Industrial anomaly detection (IAD) plays a crucial role in the maintenance and quality control of manufacturing processes. In this paper, we propose a novel approach, Vision-Language Anomaly Detection via Contrastive Cross-Modal Training…

Computer Vision and Pattern Recognition · Computer Science 2024-12-03 Kun Qian , Tianyu Sun , Wenhong Wang

Graph anomaly detection (GAD) has attracted increasing attention in recent years for identifying malicious samples in a wide range of graph-based applications, such as social media and e-commerce. However, most GAD methods assume identical…

Machine Learning · Computer Science 2025-09-09 Junjun Pan , Yu Zheng , Yue Tan , Yixin Liu

Anomaly detection is crucial to ensure the security of cyber-physical systems (CPS). However, due to the increasing complexity of CPSs and more sophisticated attacks, conventional anomaly detection methods, which face the growing volume of…

Cryptography and Security · Computer Science 2021-01-20 Yuan Luo , Ya Xiao , Long Cheng , Guojun Peng , Danfeng Daphne Yao

Anomaly detection on dynamic graphs refers to detecting entities whose behaviors obviously deviate from the norms observed within graphs and their temporal information. This field has drawn increasing attention due to its application in…

Machine Learning · Computer Science 2023-10-26 Shiqi Lou , Qingyue Zhang , Shujie Yang , Yuyang Tian , Zhaoxuan Tan , Minnan Luo

In this work, we propose CBiGAN -- a novel method for anomaly detection in images, where a consistency constraint is introduced as a regularization term in both the encoder and decoder of a BiGAN. Our model exhibits fairly good modeling…

Computer Vision and Pattern Recognition · Computer Science 2020-11-30 Fabio Carrara , Giuseppe Amato , Luca Brombin , Fabrizio Falchi , Claudio Gennaro

The latest trend in anomaly detection is to train a unified model instead of training a separate model for each category. However, existing multi-class anomaly detection (MCAD) models perform poorly in multi-view scenarios because they…

Computer Vision and Pattern Recognition · Computer Science 2025-05-01 Qianzi Yu , Yang Cao , Yu Kang

Anomaly detection is a critical and challenging task that aims to identify data points deviating from normal patterns and distributions within a dataset. Various methods have been proposed using a one-class-one-model approach, but these…

Machine Learning · Computer Science 2023-12-07 Jae Young Lee , Wonjun Lee , Jaehyun Choi , Yongkwi Lee , Young Seog Yoon

Anomaly detection in medical images is challenging due to limited annotations and a domain gap compared to natural images. Existing reconstruction methods often rely on frozen pre-trained encoders, which limits adaptation to domain-specific…

Computer Vision and Pattern Recognition · Computer Science 2025-08-28 Luhu Li , Bowen Lin , Mukhtiar Khan , Shujun Fu

This paper focuses on detecting anomalies in surveillance video using keywords by leveraging foundational models' feature representation generalization capabilities. We present a novel, lightweight pipeline for anomaly classification using…

Computer Vision and Pattern Recognition · Computer Science 2025-03-17 Thomas Foltz

Anomaly detection (AD) has been extensively studied and applied in a wide range of scenarios in the recent past. However, there are still gaps between achieved and desirable levels of recognition accuracy for making AD for practical…

Computer Vision and Pattern Recognition · Computer Science 2024-06-10 Peng Xing , Dong Zhang , Jinhui Tang , Zechao li

Contrastive learning methods for time series anomaly detection (TSAD) heavily depend on the quality of negative sample construction. However, existing strategies based on random perturbations or pseudo-anomaly injection often struggle to…

Machine Learning · Computer Science 2026-03-20 Xiancheng Wang , Lin Wang , Zhibo Zhang , Rui Wang , Minghang Zhao

Anomaly detection in videos is a significant yet challenging problem. Previous approaches based on deep neural networks employ either reconstruction-based or prediction-based approaches. Nevertheless, existing reconstruction-based methods…

Computer Vision and Pattern Recognition · Computer Science 2023-01-31 Yizhou Wang , Can Qin , Yue Bai , Yi Xu , Xu Ma , Yun Fu

Generalist Anomaly Detection (GAD) aims to train a unified model on an original domain that can detect anomalies in new target domains. Previous GAD methods primarily use only normal samples as references, overlooking the valuable…

Computer Vision and Pattern Recognition · Computer Science 2025-10-20 Yuexin Wang , Xiaolei Wang , Yizheng Gong , Jimin Xiao

Graph Anomaly Detection (GAD) is crucial for identifying abnormal entities within networks, garnering significant attention across various fields. Traditional unsupervised methods, which decode encoded latent representations of unlabeled…

Machine Learning · Computer Science 2025-02-26 Jinghan Li , Yuan Gao , Jinda Lu , Junfeng Fang , Congcong Wen , Hui Lin , Xiang Wang

Detecting anomalous nodes in attributed networks, where each node is associated with both structural connections and descriptive attributes, is essential for identifying fraud, misinformation, and suspicious behavior in domains such as…

Social and Information Networks · Computer Science 2025-10-31 Apu Chakraborty , Anshul Kumar , Gagan Raj Gupta

Graph-level anomaly detection (GLAD) is crucial for ensuring the reliability of graph-driven applications by identifying abnormal graphs that deviate from the majority. Considering the privacy concerns in distributed scenarios, federated…

Machine Learning · Computer Science 2026-05-12 Yunfeng Zhao , Yixin Liu , Qingfeng Chen , Shiyuan Li , Yue Tan , Shirui Pan

Weakly-supervised anomaly detection aims at learning an anomaly detector from a limited amount of labeled data and abundant unlabeled data. Recent works build deep neural networks for anomaly detection by discriminatively mapping the normal…

Machine Learning · Computer Science 2021-08-29 Yingjie Zhou , Xucheng Song , Yanru Zhang , Fanxing Liu , Ce Zhu , Lingqiao Liu

3D Anomaly Detection (AD) has shown great potential in detecting anomalies or defects of high-precision industrial products. However, existing methods are typically trained in a class-specific manner and also lack the capability of learning…

Computer Vision and Pattern Recognition · Computer Science 2025-08-05 Haoquan Lu , Hanzhe Liang , Jie Zhang , Chenxi Hu , Jinbao Wang , Can Gao