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Reconstruction-based methods have been commonly used for unsupervised anomaly detection, in which a normal image is reconstructed and compared with the given test image to detect and locate anomalies. Recently, diffusion models have shown…

计算机视觉与模式识别 · 计算机科学 2024-04-30 Di Wu , Shicai Fan , Xue Zhou , Li Yu , Yuzhong Deng , Jianxiao Zou , Baihong Lin

Unsupervised object discovery, the task of identifying and localizing objects in images without human-annotated labels, remains a significant challenge and a growing focus in computer vision. In this work, we introduce a novel model, DADO…

计算机视觉与模式识别 · 计算机科学 2025-10-09 Federico Gonzalez , Estefania Talavera , Petia Radeva

Driven by the pressing demand for graph anomaly detection (GAD) in high-stakes domains, the generalist GAD paradigm, which trains a single detector transferable across new graphs, has recently gained growing attention. However, existing…

机器学习 · 计算机科学 2026-05-27 Yiming Xu , Zihan Chen , Zhen Peng , Song Wang , Bin Shi , Bo Dong , Chao Shen

Unsupervised anomaly detection (UAD) aims to detect anomalies without labeled data, a necessity in many machine learning applications where anomalous samples are rare or not available. Most state-of-the-art methods fall into two categories:…

机器学习 · 计算机科学 2025-07-30 Nicolas Pinon , Carole Lartizien

Deep learning has shown remarkable performance in medical image segmentation. However, despite its promise, deep learning has many challenges in practice due to its inability to effectively transition to unseen domains, caused by the…

计算机视觉与模式识别 · 计算机科学 2024-10-08 Dewei Hu , Hao Li , Han Liu , Jiacheng Wang , Xing Yao , Daiwei Lu , Ipek Oguz

Out-of-distribution (OOD) detection is crucial for enhancing the generalization of AI models used in mammogram screening. Given the challenge of limited prior knowledge about OOD samples in external datasets, unsupervised generative…

图像与视频处理 · 电气工程与系统科学 2024-09-19 Zhemin Zhang , Bhavika Patel , Bhavik Patel , Imon Banerjee

In breast ultrasound images, precise lesion segmentation is essential for early diagnosis; however, low contrast, speckle noise, and unclear boundaries make this difficult. Even though deep learning models have demonstrated potential,…

计算机视觉与模式识别 · 计算机科学 2025-11-11 Prateek Singh , Moumita Dholey , P. K. Vinod

Anomaly detection is a critical task in industrial manufacturing, aiming to identify defective parts of products. Most industrial anomaly detection methods assume the availability of sufficient normal data for training. This assumption may…

计算机视觉与模式识别 · 计算机科学 2024-08-06 Zhenyu Yan , Qingqing Fang , Wenxi Lv , Qinliang Su

Breast cancer classification remains a challenging task due to inter-class ambiguity and intra-class variability. Existing deep learning-based methods try to confront this challenge by utilizing complex nonlinear projections. However, these…

计算机视觉与模式识别 · 计算机科学 2020-10-08 Xiao Kang , Xingbo Liu , Xiushan Nie , Xiaoming Xi , Yilong Yin

We focus on the problem of Unsupervised Domain Adaptation (\uda) for breast cancer detection from mammograms (BCDM) problem. Recent advancements have shown that masked image modeling serves as a robust pretext task for UDA. However, when…

计算机视觉与模式识别 · 计算机科学 2024-07-10 Tajamul Ashraf , Krithika Rangarajan , Mohit Gambhir , Richa Gabha , Chetan Arora

Knowledge Distillation-based Anomaly Detection (KDAD) methods rely on the teacher-student paradigm to detect and segment anomalous regions by contrasting the unique features extracted by both networks. However, existing KDAD methods suffer…

计算机视觉与模式识别 · 计算机科学 2023-07-25 Peng Xing , Hao Tang , Jinhui Tang , Zechao Li

Unsupervised Anomaly Detection (UAD) methods aim to identify anomalies in test samples comparing them with a normative distribution learned from a dataset known to be anomaly-free. Approaches based on generative models offer…

计算机视觉与模式识别 · 计算机科学 2024-07-10 Sergio Naval Marimont , Vasilis Siomos , Matthew Baugh , Christos Tzelepis , Bernhard Kainz , Giacomo Tarroni

Diffuse optical breast imaging utilizes near-infrared (NIR) light propagation through tissues to assess the optical properties of tissue for the identification of abnormal tissue. This optical imaging approach is sensitive, cost-effective,…

医学物理 · 物理学 2017-11-22 Wenxiang Cong , Xavier Intes , Ge Wang

Unsupervised visual anomaly detection from multi-view images presents a significant challenge: distinguishing genuine defects from benign appearance variations caused by viewpoint changes. Existing methods, often designed for single-view…

计算机视觉与模式识别 · 计算机科学 2025-11-25 Xintao Chen , Xiaohao Xu , Bozhong Zheng , Yun Liu , Yingna Wu

Traditional deep learning models often lack annotated data, especially in cross-domain applications such as anomaly detection, which is critical for early disease diagnosis in medicine and defect detection in industry. To address this…

计算机视觉与模式识别 · 计算机科学 2026-02-06 Wahyu Rahmaniar , Kenji Suzuki

Recent advancements in diffusion models have demonstrated significant success in unsupervised anomaly segmentation. For anomaly segmentation, these models are first trained on normal data; then, an anomalous image is noised to an…

计算机视觉与模式识别 · 计算机科学 2025-08-08 Mehrdad Moradi , Kamran Paynabar

Anomaly detection (AD), separating anomalies from normal data, has many applications across domains, from security to healthcare. While most previous works were shown to be effective for cases with fully or partially labeled data, that…

机器学习 · 计算机科学 2022-08-08 Jinsung Yoon , Kihyuk Sohn , Chun-Liang Li , Sercan O. Arik , Chen-Yu Lee , Tomas Pfister

Time series anomaly detection (TSAD) has been an important area of research for decades, with reconstruction-based methods, mostly based on generative models, gaining popularity and demonstrating success. Diffusion models have recently…

机器学习 · 计算机科学 2026-03-02 Kohei Obata , Zheng Chen , Yasuko Matsubara , Lingwei Zhu , Yasushi Sakurai

Known for their impressive performance in generative modeling, diffusion models are attractive candidates for density-based anomaly detection. This paper investigates different variations of diffusion modeling for unsupervised and…

机器学习 · 计算机科学 2026-05-11 Victor Livernoche , Vineet Jain , Yashar Hezaveh , Siamak Ravanbakhsh

Deep generative models have emerged as promising tools for detecting arbitrary anomalies in data, dispensing with the necessity for manual labelling. Recently, autoregressive transformers have achieved state-of-the-art performance for…