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Trajectory anomaly detection, aiming to estimate the anomaly risk of trajectories given the Source-Destination (SD) pairs, has become a critical problem for many real-world applications. Existing solutions directly train a generative model…

Machine Learning · Computer Science 2024-12-30 Wenbin Li , Di Yao , Chang Gong , Xiaokai Chu , Quanliang Jing , Xiaolei Zhou , Yuxuan Zhang , Yunxia Fan , Jingping Bi

Advanced attack campaigns span across multiple stages and stay stealthy for long time periods. There is a growing trend of attackers using off-the-shelf tools and pre-installed system applications (such as \emph{powershell} and \emph{wmic})…

Cryptography and Security · Computer Science 2019-05-21 Aditya Kuppa , Slawomir Grzonkowski , Muhammad Rizwan Asghar , Nhien-An Le-Khac

In Pose-based Video Anomaly Detection prior art is rooted on the assumption that abnormal events can be mostly regarded as a result of uncommon human behavior. Opposed to utilizing skeleton representations of humans, however, we investigate…

Computer Vision and Pattern Recognition · Computer Science 2025-03-30 Mia Siemon , Ivan Nikolov , Thomas B. Moeslund , Kamal Nasrollahi

Skeleton-based video anomaly detection (SVAD) is a crucial task in computer vision. Accurately identifying abnormal patterns or events enables operators to promptly detect suspicious activities, thereby enhancing safety. Achieving this…

Computer Vision and Pattern Recognition · Computer Science 2024-09-04 Ali Karami , Thi Kieu Khanh Ho , Narges Armanfard

Recognizing abnormal events such as traffic violations and accidents in natural driving scenes is essential for successful autonomous driving and advanced driver assistance systems. However, most work on video anomaly detection suffers from…

Computer Vision and Pattern Recognition · Computer Science 2019-07-29 Yu Yao , Mingze Xu , Yuchen Wang , David J. Crandall , Ella M. Atkins

Reliable foreign-object anomaly detection and pixel-level localization in conveyor-belt coal scenes are essential for safe and intelligent mining operations. This task is particularly challenging due to the highly unstructured environment:…

Computer Vision and Pattern Recognition · Computer Science 2026-02-10 Wenping Jin , Yuyang Tang , Li Zhu

Anomaly detection in decision-making sequences is a challenging problem due to the complexity of normality representation learning and the sequential nature of the task. Most existing methods based on Reinforcement Learning (RL) are…

Machine Learning · Computer Science 2024-02-08 Chen Wang , Sarah Erfani , Tansu Alpcan , Christopher Leckie

Graph anomaly detection is crucial for identifying nodes that deviate from regular behavior within graphs, benefiting various domains such as fraud detection and social network. Although existing reconstruction-based methods have achieved…

Machine Learning · Computer Science 2023-12-25 Junwei He , Qianqian Xu , Yangbangyan Jiang , Zitai Wang , Qingming Huang

In this paper we are interested in analyzing behaviour in crowded public places at the level of holistic motion. Our aim is to learn, without user input, strong scene priors or labelled data, the scope of "normal behaviour" for a particular…

Computer Vision and Pattern Recognition · Computer Science 2013-09-26 Ognjen Arandjelović

Despite the rapid advance of unsupervised anomaly detection, existing methods require to train separate models for different objects. In this work, we present UniAD that accomplishes anomaly detection for multiple classes with a unified…

Computer Vision and Pattern Recognition · Computer Science 2022-10-26 Zhiyuan You , Lei Cui , Yujun Shen , Kai Yang , Xin Lu , Yu Zheng , Xinyi Le

Graph anomaly detection (GAD) has attracted increasing attention in machine learning and data mining. Recent works have mainly focused on how to capture richer information to improve the quality of node embeddings for GAD. Despite their…

Machine Learning · Computer Science 2023-10-03 Jingcan Duan , Pei Zhang , Siwei Wang , Jingtao Hu , Hu Jin , Jiaxin Zhang , Haifang Zhou , Xinwang Liu

Detecting anomalies in multivariate time series(MTS) data plays an important role in many domains. The abnormal values could indicate events, medical abnormalities,cyber-attacks, or faulty devices which if left undetected could lead to…

Machine Learning · Computer Science 2023-01-31 Usman Anjum , Samuel Lin , Justin Zhan

In recent years, anomaly events detection in crowd scenes attracts many researchers' attention, because of its importance to public safety. Existing methods usually exploit visual information to analyze whether any abnormal events have…

Computer Vision and Pattern Recognition · Computer Science 2021-10-29 Junyu Gao , Maoguo Gong , Xuelong Li

Collaborative Perception (CP) has been a promising solution to address occlusions in the traffic environment by sharing sensor data among collaborative vehicles (CoV) via vehicle-to-everything (V2X) network. With limited wireless bandwidth,…

Robotics · Computer Science 2024-07-02 Yukuan Jia , Yuxuan Sun , Ruiqing Mao , Zhaojun Nan , Sheng Zhou , Zhisheng Niu

This study introduces SECODA, a novel general-purpose unsupervised non-parametric anomaly detection algorithm for datasets containing continuous and categorical attributes. The method is guaranteed to identify cases with unique or sparse…

Databases · Computer Science 2020-08-18 Ralph Foorthuis

Graph anomaly detection (GAD), which aims to identify abnormal nodes that differ from the majority within a graph, has garnered significant attention. However, current GAD methods necessitate training specific to each dataset, resulting in…

Machine Learning · Computer Science 2024-12-25 Yixin Liu , Shiyuan Li , Yu Zheng , Qingfeng Chen , Chengqi Zhang , Shirui Pan

With exponential increase in the availability oftelemetry / streaming / real-time data, understanding contextualbehavior changes is a vital functionality in order to deliverunrivalled customer experience and build high performance andhigh…

Social and Information Networks · Computer Science 2019-02-19 Amit Kumar , Tanya Ahuja , Rajesh Kumar Madabhattula , Murali Kante , Srinivasa Rao Aravilli

This paper presents an approach to detect and track groups of people in video-surveillance applications, and to automatically recognize their behavior. This method keeps track of individuals moving together by maintaining a spacial and…

Computer Vision and Pattern Recognition · Computer Science 2013-03-04 Sofia Zaidenberg , Bernard Boulay , François Bremond

Anomaly activities such as robbery, explosion, accidents, etc. need immediate actions for preventing loss of human life and property in real world surveillance systems. Although the recent automation in surveillance systems are capable of…

Computer Vision and Pattern Recognition · Computer Science 2021-08-23 Snehashis Majhi , Srijan Das , Francois Bremond , Ratnakar Dash , Pankaj Kumar Sa

Unsupervised Anomaly Detection (UAD) plays a crucial role in identifying abnormal patterns within data without labeled examples, holding significant practical implications across various domains. Although the individual contributions of…

Machine Learning · Computer Science 2024-06-04 Zeyu Fang , Ming Gu , Sheng Zhou , Jiawei Chen , Qiaoyu Tan , Haishuai Wang , Jiajun Bu
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