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Domain shift and label scarcity heavily limit deep learning applications to various medical image analysis tasks. Unsupervised domain adaptation (UDA) techniques have recently achieved promising cross-modality medical image segmentation by…

Computer Vision and Pattern Recognition · Computer Science 2023-05-12 Ziyuan Zhao , Fangcheng Zhou , Zeng Zeng , Cuntai Guan , S. Kevin Zhou

Deep learning is widely applied in computer-aided pathological diagnosis, which alleviates the pathologist workload and provide timely clinical analysis. However, most models generally require large-scale annotated data for training, which…

Computer Vision and Pattern Recognition · Computer Science 2024-03-12 Zeyu Liu , Tianyi Zhang , Yufang He , Yunlu Feng , Yu Zhao , Guanglei Zhang

We present a novel approach for unsupervised domain adaptation (UDA) for natural images. A commonly-used objective for UDA schemes is to enhance domain alignment in representation space even if there is a domain shift in the input space.…

Computer Vision and Pattern Recognition · Computer Science 2025-06-24 Ravi Kant Gupta , Shounak Das , Amit Sethi

Unsupervised Domain Adaptation (UDA) aims at classifying unlabeled target images leveraging source labeled ones. In this work, we consider the Partial Domain Adaptation (PDA) variant, where we have extra source classes not present in the…

Computer Vision and Pattern Recognition · Computer Science 2022-10-05 Tiago Salvador , Kilian Fatras , Ioannis Mitliagkas , Adam Oberman

Unsupervised Domain Adaptation (UDA) is essential for deploying medical segmentation models across diverse clinical environments. Existing methods are fundamentally limited, suffering from semantically unaware feature alignment that results…

Computer Vision and Pattern Recognition · Computer Science 2026-03-24 Linkuan Zhou , Yinghao Xia , Yufei Shen , Xiangyu Li , Wenjie Du , Cong Cong , Leyi Wei , Ran Su , Qiangguo Jin

We address the Unsupervised Domain Adaptation (UDA) problem in image classification from a new perspective. In contrast to most existing works which either align the data distributions or learn domain-invariant features, we directly learn a…

Computer Vision and Pattern Recognition · Computer Science 2020-12-03 Qian Wang , Fanlin Meng , Toby P. Breckon

Addressing performance degradation in 3D LiDAR semantic segmentation due to domain shifts (e.g., sensor type, geographical location) is crucial for autonomous systems, yet manual annotation of target data is prohibitive. This study…

Computer Vision and Pattern Recognition · Computer Science 2025-07-25 Abhishek Kaushik , Norbert Haala , Uwe Soergel

Current state-of-the-art object detectors can have significant performance drop when deployed in the wild due to domain gaps with training data. Unsupervised Domain Adaptation (UDA) is a promising approach to adapt models for new…

Computer Vision and Pattern Recognition · Computer Science 2021-08-06 Fuxun Yu , Di Wang , Yinpeng Chen , Nikolaos Karianakis , Tong Shen , Pei Yu , Dimitrios Lymberopoulos , Sidi Lu , Weisong Shi , Xiang Chen

Supervised deep learning usually faces more challenges in medical images than in natural images. Since annotations in medical images require the expertise of doctors and are more time-consuming and expensive. Thus, some researchers turn to…

Computer Vision and Pattern Recognition · Computer Science 2025-02-25 Tao Yang , Lisheng Wang

Medical image data is less accessible than in other domains due to privacy and regulatory constraints. In addition, labeling requires costly, time-intensive manual image annotation by clinical experts. To overcome these challenges,…

Image and Video Processing · Electrical Eng. & Systems 2025-07-11 Fangyijie Wang , Kevin Whelan , Félix Balado , Kathleen M. Curran , Guénolé Silvestre

Unsupervised anomaly detection in brain images is crucial for identifying injuries and pathologies without access to labels. However, the accurate localization of anomalies in medical images remains challenging due to the inherent…

Computer Vision and Pattern Recognition · Computer Science 2025-07-25 Farzad Beizaee , Gregory Lodygensky , Christian Desrosiers , Jose Dolz

Unsupervised domain adaptation (UDA) aims to transfer knowledge learned from a fully-labeled source domain to a different unlabeled target domain. Most existing UDA methods learn domain-invariant feature representations by minimizing…

Computer Vision and Pattern Recognition · Computer Science 2022-05-10 Rui Wang , Zuxuan Wu , Zejia Weng , Jingjing Chen , Guo-Jun Qi , Yu-Gang Jiang

Unsupervised domain adaptation (UDA) plays a crucial role in object detection when adapting a source-trained detector to a target domain without annotated data. In this paper, we propose a novel and effective four-step UDA approach that…

Computer Vision and Pattern Recognition · Computer Science 2023-08-30 Mohamed L. Mekhalfi , Davide Boscaini , Fabio Poiesi

Current unsupervised domain adaptation (UDA) methods for semantic segmentation typically assume identical class labels between the source and target domains. This assumption ignores the label-level domain gap, which is common in real-world…

Computer Vision and Pattern Recognition · Computer Science 2025-01-29 Han Sun , Rui Gong , Ismail Nejjar , Olga Fink

Traditional supervised medical image segmentation models require large amounts of labeled data for training; however, obtaining such large-scale labeled datasets in the real world is extremely challenging. Recent semi-supervised…

Computer Vision and Pattern Recognition · Computer Science 2025-05-26 Yunyao Lu , Yihang Wu , Reem Kateb , Ahmad Chaddad

Unsupervised domain adaptive (UDA) person re-identification (re-ID) is a challenging task due to the missing of labels for the target domain data. To handle this problem, some recent works adopt clustering algorithms to off-line generate…

Computer Vision and Pattern Recognition · Computer Science 2021-09-29 Yongxing Dai , Jun Liu , Yan Bai , Zekun Tong , Ling-Yu Duan

Domain adaptation addresses the challenge of model performance degradation caused by domain gaps. In the typical setup for unsupervised domain adaptation, labeled data from a source domain and unlabeled data from a target domain are used to…

Computer Vision and Pattern Recognition · Computer Science 2025-05-16 Siqi Yin , Shaolei Liu , Manning Wang

Face anti-spoofing (FAS) approaches based on unsupervised domain adaption (UDA) have drawn growing attention due to promising performances for target scenarios. Most existing UDA FAS methods typically fit the trained models to the target…

Computer Vision and Pattern Recognition · Computer Science 2022-11-24 Qianyu Zhou , Ke-Yue Zhang , Taiping Yao , Ran Yi , Kekai Sheng , Shouhong Ding , Lizhuang Ma

In this paper, we tackle the unsupervised domain adaptation (UDA) for semantic segmentation, which aims to segment the unlabeled real data using labeled synthetic data. The main problem of UDA for semantic segmentation relies on reducing…

Computer Vision and Pattern Recognition · Computer Science 2020-12-24 Suhyeon Lee , Junhyuk Hyun , Hongje Seong , Euntai Kim

Unsupervised domain adaptation (UDA) for image classification has made remarkable progress in transferring classification knowledge from a labeled source domain to an unlabeled target domain, thanks to effective domain alignment techniques.…

Computer Vision and Pattern Recognition · Computer Science 2024-01-12 Lin Zhang , Linghan Xu , Saman Motamed , Shayok Chakraborty , Fernando De la Torre