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We address the problem of anomaly detection, that is, detecting anomalous events in a video sequence. Anomaly detection methods based on convolutional neural networks (CNNs) typically leverage proxy tasks, such as reconstructing input video…

Computer Vision and Pattern Recognition · Computer Science 2020-03-31 Hyunjong Park , Jongyoun Noh , Bumsub Ham

Semi-supervised methods of anomaly detection have seen substantial advancement in recent years. Of particular interest are applications of such methods to diverse, real-world anomaly detection problems where anomalous variations can vary…

Computer Vision and Pattern Recognition · Computer Science 2021-04-29 Jack W. Barker , Toby P. Breckon

Anomaly detection has been widely studied in the context of industrial defect inspection, with numerous methods developed to tackle a range of challenges. In digital pathology, anomaly detection holds significant potential for applications…

Image and Video Processing · Electrical Eng. & Systems 2025-06-25 Can Cui , Xindong Zheng , Ruining Deng , Quan Liu , Tianyuan Yao , Keith T Wilson , Lori A Coburn , Bennett A Landman , Haichun Yang , Yaohong Wang , Yuankai Huo

Unsupervised Anomaly Detection has become a popular method to detect pathologies in medical images as it does not require supervision or labels for training. Most commonly, the anomaly detection model generates a "normal" version of an…

Image and Video Processing · Electrical Eng. & Systems 2023-09-26 Felix Meissen , Johannes Paetzold , Georgios Kaissis , Daniel Rueckert

The previous advancements in pathology image understanding primarily involved developing models tailored to specific tasks. Recent studies has demonstrated that the large vision-language model can enhance the performance of various…

Artificial Intelligence · Computer Science 2024-08-20 Dawei Dai , Yuanhui Zhang , Long Xu , Qianlan Yang , Xiaojing Shen , Shuyin Xia , Guoyin Wang

Many anomaly detection approaches, especially deep learning methods, have been recently developed to identify abnormal image morphology by only employing normal images during training. Unfortunately, many prior anomaly detection methods…

Image anomaly detection consists in detecting images or image portions that are visually different from the majority of the samples in a dataset. The task is of practical importance for various real-life applications like biomedical image…

Computer Vision and Pattern Recognition · Computer Science 2022-10-28 Axel De Nardin , Pankaj Mishra , Gian Luca Foresti , Claudio Piciarelli

Visual anomaly detection targets to detect images that notably differ from normal pattern, and it has found extensive application in identifying defective parts within the manufacturing industry. These anomaly detection paradigms…

Computer Vision and Pattern Recognition · Computer Science 2024-11-15 Anindya Sundar Das , Guansong Pang , Monowar Bhuyan

Neural network-based anomaly detection remains challenging in clinical applications with little or no supervised information and subtle anomalies such as hardly visible brain lesions. Among unsupervised methods, patch-based auto-encoders…

Image and Video Processing · Electrical Eng. & Systems 2023-02-28 Nicolas Pinon , Geoffroy Oudoumanessah , Robin Trombetta , Michel Dojat , Florence Forbes , Carole Lartizien

Visual Language Models (VLMs) have demonstrated impressive capabilities in visual grounding tasks. However, their effectiveness in the medical domain, particularly for abnormality detection and localization within medical images, remains…

Computer Vision and Pattern Recognition · Computer Science 2025-03-06 Jun Li , Che Liu , Wenjia Bai , Rossella Arcucci , Cosmin I. Bercea , Julia A. Schnabel

Oversight in medical images is a crucial problem, and timely reporting of medical images is desired. Therefore, an all-purpose anomaly detection method that can detect virtually all types of lesions/diseases in a given image is strongly…

Image and Video Processing · Electrical Eng. & Systems 2020-10-21 H. Shibata , S. Hanaoka , Y. Nomura , T. Nakao , I. Sato , D. Sato , N. Hayashi , O. Abe

Medical images are often used to detect and characterize pathology and disease; however, automatically identifying and segmenting pathology in medical images is challenging because the appearance of pathology across diseases varies widely.…

Image and Video Processing · Electrical Eng. & Systems 2020-02-19 Jacob C. Reinhold , Yufan He , Shizhong Han , Yunqiang Chen , Dashan Gao , Junghoon Lee , Jerry L. Prince , Aaron Carass

Anomaly detection in medical imaging is a challenging task in contexts where abnormalities are not annotated. This problem can be addressed through unsupervised anomaly detection (UAD) methods, which identify features that do not match with…

Image and Video Processing · Electrical Eng. & Systems 2023-09-07 Geoffroy Oudoumanessah , Carole Lartizien , Michel Dojat , Florence Forbes

The task of image anomaly detection (IAD) aims to identify deviations from normality in image data. These anomalies are patterns that deviate significantly from what the IAD model has learned from the data during training. However, in…

Computer Vision and Pattern Recognition · Computer Science 2024-07-30 Jihun Yi , Dahuin Jung , Sungroh Yoon

Topology is critical in tubular structures such as blood vessels, nerve fibers, and road networks, where connectivity and loop structure govern downstream functional analysis. Vision-Language Models (VLMs) are promising candidates for…

Computer Vision and Pattern Recognition · Computer Science 2026-05-14 Meilong Xu , Qingqiao Hu , Xiaoling Hu , Shahira Abousamra , Xin Yu , Weimin Lyu , Kehan Qi , Dimitris Samaras , Chao Chen

Vision-Language Models (VLMs) frequently "hallucinate" - generate plausible yet factually incorrect statements - posing a critical barrier to their trustworthy deployment. In this work, we propose a new paradigm for diagnosing…

Computer Vision and Pattern Recognition · Computer Science 2026-03-17 Lexiang Xiong , Qi Li , Jingwen Ye , Xinchao Wang

Anomaly detection in visual data refers to the problem of differentiating abnormal appearances from normal cases. Supervised approaches have been successfully applied to different domains, but require an abundance of labeled data. Due to…

Image and Video Processing · Electrical Eng. & Systems 2021-04-29 Dejan Stepec , Danijel Skocaj

Anomalies can be defined as any non-random structure which deviates from normality. Anomaly detection methods reported in the literature are numerous and diverse, as what is considered anomalous usually varies depending on particular…

Computer Vision and Pattern Recognition · Computer Science 2022-05-25 Matías Tailanian , Pablo Musé , Álvaro Pardo

Accurate disease interpretation from radiology remains challenging due to imaging heterogeneity. Achieving expert-level diagnostic decisions requires integration of subtle image features with clinical knowledge. Yet major vision-language…

Computer Vision and Pattern Recognition · Computer Science 2025-11-12 Difei Gu , Yunhe Gao , Mu Zhou , Dimitris Metaxas

This research explores the integration of language models and unsupervised anomaly detection in medical imaging, addressing two key questions: (1) Can language models enhance the interpretability of anomaly detection maps? and (2) Can…

Computer Vision and Pattern Recognition · Computer Science 2024-07-24 Jun Li , Su Hwan Kim , Philip Müller , Lina Felsner , Daniel Rueckert , Benedikt Wiestler , Julia A. Schnabel , Cosmin I. Bercea