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We consider the problem of anomaly detection in images, and present a new detection technique. Given a sample of images, all known to belong to a "normal" class (e.g., dogs), we show how to train a deep neural model that can detect…

Machine Learning · Computer Science 2018-11-12 Izhak Golan , Ran El-Yaniv

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

Machine learning offers potential solutions to current issues in industrial systems in areas such as quality control and predictive maintenance, but also faces unique barriers in industrial applications. An ongoing challenge is extreme…

Machine Learning · Computer Science 2026-01-15 Lesley Wheat , Martin v. Mohrenschildt , Saeid Habibi

The interest for video anomaly detection systems has gained traction for the past few years. The current approaches use deep learning to perform anomaly detection in videos, but this approach has multiple problems. For starters, deep…

Computer Vision and Pattern Recognition · Computer Science 2022-06-01 Vladimir Monakhov , Vajira Thambawita , Pål Halvorsen , Michael A. Riegler

Abnormal event detection in video is a complex computer vision problem that has attracted significant attention in recent years. The complexity of the task arises from the commonly-adopted definition of an abnormal event, that is, a rarely…

Computer Vision and Pattern Recognition · Computer Science 2023-04-07 Mariana-Iuliana Georgescu , Radu Tudor Ionescu , Fahad Shahbaz Khan , Marius Popescu , Mubarak Shah

Anomaly detection in videos refers to the identification of events that do not conform to expected behavior. However, almost all existing methods tackle the problem by minimizing the reconstruction errors of training data, which cannot…

Computer Vision and Pattern Recognition · Computer Science 2018-03-14 Wen Liu , Weixin Luo , Dongze Lian , Shenghua Gao

We develop a novel framework for single-scene video anomaly localization that allows for human-understandable reasons for the decisions the system makes. We first learn general representations of objects and their motions (using deep…

Computer Vision and Pattern Recognition · Computer Science 2022-12-16 Ashish Singh , Michael J. Jones , Erik Learned-Miller

Anomaly Detectors are trained on healthy operating condition data and raise an alarm when the measured samples deviate from the training data distribution. This means that the samples used to train the model should be sufficient in quantity…

Machine Learning · Computer Science 2021-02-24 Gabriel Michau , Olga Fink

Deep neural networks (DNN) can achieve high performance when applied to In-Distribution (ID) data which come from the same distribution as the training set. When presented with anomaly inputs not from the ID, the outputs of a DNN should be…

Machine Learning · Computer Science 2021-10-08 Fangzhen Zhao , Chenyi Zhang , Naipeng Dong , Zefeng You , Zhenxin Wu

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

This paper introduces a novel anomaly detection framework that combines the robust statistical principles of density-estimation-based anomaly detection methods with the representation-learning capabilities of deep learning models. The…

Machine Learning · Computer Science 2024-08-15 Joseph Gallego-Mejia , Oscar Bustos-Brinez , Fabio A. González

Supervised anomaly detection methods perform well in identifying known anomalies that are well represented in the training set. However, they often struggle to generalise beyond the training distribution due to decision boundaries that lack…

Machine Learning · Computer Science 2025-11-18 Zahra Zamanzadeh Darban , Qizhou Wang , Charu C. Aggarwal , Geoffrey I. Webb , Ehsan Abbasnejad , Mahsa Salehi

Due to the limited availability of anomalous samples for training, video anomaly detection is commonly viewed as a one-class classification problem. Many prevalent methods investigate the reconstruction difference produced by AutoEncoders…

Computer Vision and Pattern Recognition · Computer Science 2023-03-10 Xiangyu Huang , Caidan Zhao , Chenxing Gao , Lvdong Chen , Zhiqiang Wu

Video anomaly detection (VAD) has been paid increasing attention due to its potential applications, its current dominant tasks focus on online detecting anomalies% at the frame level, which can be roughly interpreted as the binary or…

Computer Vision and Pattern Recognition · Computer Science 2024-02-29 Peng Wu , Jing Liu , Xiangteng He , Yuxin Peng , Peng Wang , Yanning Zhang

Video anomaly detection aims to identify abnormal events that occurred in videos. Since anomalous events are relatively rare, it is not feasible to collect a balanced dataset and train a binary classifier to solve the task. Thus, most…

Computer Vision and Pattern Recognition · Computer Science 2022-11-24 Guangyu Sun , Zhang Liu , Lianggong Wen , Jing Shi , Chenliang Xu

Video anomaly detection is to determine whether there are any abnormal events, behaviors or objects in a given video, which enables effective and intelligent public safety management. As video anomaly labeling is both time-consuming and…

Computer Vision and Pattern Recognition · Computer Science 2024-07-08 Yang Wang , Jiaogen Zhou , Jihong Guan

We tackle the complex problem of detecting and recognising anomalies in surveillance videos at the frame level, utilising only video-level supervision. We introduce the novel method AnomalyCLIP, the first to combine Large Language and…

Computer Vision and Pattern Recognition · Computer Science 2023-10-05 Luca Zanella , Benedetta Liberatori , Willi Menapace , Fabio Poiesi , Yiming Wang , Elisa Ricci

This paper showcases an experimental study on anomaly detection using computer vision. The study focuses on class distinction and performance evaluation, combining OpenCV with deep learning techniques while employing a TensorFlow-based…

Computer Vision and Pattern Recognition · Computer Science 2025-03-26 Md. Barkat Ullah Tusher , Shartaz Khan Akash , Amirul Islam Showmik

Unsupervised representation learning has been extensively employed in anomaly detection, achieving impressive performance. Extracting valuable feature vectors that can remarkably improve the performance of anomaly detection are essential in…

Machine Learning · Computer Science 2022-04-26 Muhao Xu , Xueying Zhou , Xizhan Gao , WeiKai He , Sijie Niu

Video Anomaly Detection (VAD) has emerged as a pivotal task in computer vision, with broad relevance across multiple fields. Recent advances in deep learning have driven significant progress in this area, yet the field remains fragmented…

Computer Vision and Pattern Recognition · Computer Science 2025-08-21 Ghazal Alinezhad Noghre , Armin Danesh Pazho , Hamed Tabkhi