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The goal of anomaly detection is to identify examples that deviate from normal or expected behavior. We tackle this problem for images. We consider a two-phase approach. First, using normal examples, a convolutional autoencoder (CAE) is…

Computer Vision and Pattern Recognition · Computer Science 2020-03-20 Natasa Sarafijanovic-Djukic , Jesse Davis

Unmanned aerial vehicle (UAV)-assisted sensor networks (UASNets), which play a crucial role in creating new opportunities, are experiencing significant growth in civil applications worldwide. UASNets improve disaster management through…

Signal Processing · Electrical Eng. & Systems 2023-12-18 Yousef Emami

Anomaly detection based on 3D point cloud data is an important research problem and receives more and more attention recently. Untrained anomaly detection based on only one sample is an emerging research problem motivated by real…

Machine Learning · Computer Science 2025-07-29 Juan Du , Dongheng Chen

The unmanned aerial vehicle (UAV) network has gained significant attentions in recent years due to its various applications. However, the traffic security becomes the key threatening public safety issue in an emergency rescue system due to…

Machine Learning · Computer Science 2025-03-27 Yulu Han , Ziye Jia , Sijie He , Yu Zhang , Qihui Wu

Unmanned aerial vehicles (UAVs) are increasingly employed in diverse applications such as land surveying, material transport, and environmental monitoring. Following missions like data collection or inspection, UAVs must land safely at…

Robotics · Computer Science 2025-06-30 Haiping Yang , Huaxing Liu , Wei Wu , Zuohui Chen , Ning Wu

The advances in deep neural networks (DNN) have significantly enhanced real-time detection of anomalous data in IoT applications. However, the complexity-accuracy-delay dilemma persists: complex DNN models offer higher accuracy, but typical…

Machine Learning · Computer Science 2021-08-21 Mao V. Ngo , Tie Luo , Tony Q. S. Quek

Due to its relevance in intelligent transportation systems, anomaly detection in traffic videos has recently received much interest. It remains a difficult problem due to a variety of factors influencing the video quality of a real-time…

Computer Vision and Pattern Recognition · Computer Science 2021-04-21 Keval Doshi , Yasin Yilmaz

Unsupervised learning can leverage large-scale data sources without the need for annotations. In this context, deep learning-based auto encoders have shown great potential in detecting anomalies in medical images. However, state-of-the-art…

Machine Learning · Computer Science 2018-12-17 David Zimmerer , Simon A. A. Kohl , Jens Petersen , Fabian Isensee , Klaus H. Maier-Hein

This paper aims to address the unsupervised video anomaly detection (VAD) problem, which involves classifying each frame in a video as normal or abnormal, without any access to labels. To accomplish this, the proposed method employs…

Computer Vision and Pattern Recognition · Computer Science 2023-07-20 Anil Osman Tur , Nicola Dall'Asen , Cigdem Beyan , Elisa Ricci

Image anomaly detection consists in finding images with anomalous, unusual patterns with respect to a set of normal data. Anomaly detection can be applied to several fields and has numerous practical applications, e.g. in industrial…

Computer Vision and Pattern Recognition · Computer Science 2019-09-09 Claudio Piciarelli , Pankaj Mishra , Gian Luca Foresti

Due to the recent increase in the number of connected devices, the need to promptly detect security issues is emerging. Moreover, the high number of communication flows creates the necessity of processing huge amounts of data. Furthermore,…

Computer Vision and Pattern Recognition · Computer Science 2025-12-09 Michael Neri , Sara Baldoni

Exploiting the rapid advances in probabilistic inference, in particular variational Bayes and variational autoencoders (VAEs), for anomaly detection (AD) tasks remains an open research question. Previous works argued that training VAE…

Machine Learning · Computer Science 2020-10-13 Adrian Alan Pol , Victor Berger , Gianluca Cerminara , Cecile Germain , Maurizio Pierini

This paper explores the use of a Bayesian non-parametric topic modeling technique for the purpose of anomaly detection in video data. We present results from two experiments. The first experiment shows that the proposed technique is…

Computer Vision and Pattern Recognition · Computer Science 2016-02-17 Yogesh Girdhar , Walter Cho , Matthew Campbell , Jesus Pineda , Elizabeth Clarke , Hanumant Singh

It is challenging to detect the anomaly in crowded scenes for quite a long time. In this paper, a self-supervised framework, abnormal event detection network (AED-Net), which is composed of PCAnet and kernel principal component analysis…

Computer Vision and Pattern Recognition · Computer Science 2019-03-29 Tian Wang , Zichen Miao , Yuxin Chen , Yi Zhou , Guangcun Shan , Hichem Snoussi

Video anomaly detection (VAD) is crucial for video analysis and surveillance in computer vision. However, existing VAD models rely on learned normal patterns, which makes them difficult to apply to diverse environments. Consequently, users…

Computer Vision and Pattern Recognition · Computer Science 2025-12-08 Sunghyun Ahn , Youngwan Jo , Kijung Lee , Sein Kwon , Inpyo Hong , Sanghyun Park

Human drivers can recognise fast abnormal driving situations to avoid accidents. Similar to humans, automated vehicles are supposed to perform anomaly detection. In this work, we propose the spatio-temporal graph auto-encoder for learning…

Robotics · Computer Science 2021-10-29 Julian Wiederer , Arij Bouazizi , Marco Troina , Ulrich Kressel , Vasileios Belagiannis

To ensure undisrupted business, large Internet companies need to closely monitor various KPIs (e.g., Page Views, number of online users, and number of orders) of its Web applications, to accurately detect anomalies and trigger timely…

Machine Learning · Computer Science 2018-02-13 Haowen Xu , Wenxiao Chen , Nengwen Zhao , Zeyan Li , Jiahao Bu , Zhihan Li , Ying Liu , Youjian Zhao , Dan Pei , Yang Feng , Jie Chen , Zhaogang Wang , Honglin Qiao

Nowadays, there are outstanding strides towards a future with autonomous vehicles on our roads. While the perception of autonomous vehicles performs well under closed-set conditions, they still struggle to handle the unexpected. This survey…

Robotics · Computer Science 2025-11-25 Daniel Bogdoll , Maximilian Nitsche , J. Marius Zöllner

Anomaly detection in surveillance videos is currently a challenge because of the diversity of possible events. We propose a deep convolutional neural network (CNN) that addresses this problem by learning a correspondence between common…

Computer Vision and Pattern Recognition · Computer Science 2019-08-20 Trong Nguyen Nguyen , Jean Meunier

The integration of Unmanned Aerial Vehicles (UAVs) with artificial intelligence (AI) models for aerial imagery processing in disaster assessment, necessitates models that demonstrate exceptional accuracy, computational efficiency, and…

Computer Vision and Pattern Recognition · Computer Science 2024-10-18 Demetris Shianios , Panayiotis Kolios , Christos Kyrkou
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