FDA: Fourier Domain Adaptation for Semantic Segmentation
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Abstract (arXiv)
We describe a simple method for unsupervised domain adaptation, whereby the discrepancy between the source and target distributions is reduced by swapping the low-frequency spectrum of one with the other. We illustrate the method in semantic segmentation, where densely annotated images are aplenty in one domain (synthetic data), but difficult to obtain in another (real images). Current state-of-the-art methods are complex, some requiring adversarial optimization to render the backbone of a neural network invariant to the discrete domain selection variable. Our method does not require any training to perform the domain alignment, just a simple Fourier Transform and its inverse. Despite its simplicity, it achieves state-of-the-art performance in the current benchmarks, when integrated into a relatively standard semantic segmentation model. Our results indicate that even simple procedures can discount nuisance variability in the data that more sophisticated methods struggle to learn away.
Key facts. Cited by 540 papers in the map (data through 7 Oct 2026). First posted on arXiv 11 Apr 2020.
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Citing papers per year: 2021: 92; 2022: 127; 2023: 128; 2024: 80; 2025: 68; 2026: 45.
540 papers.
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- 2022Continual Test-Time Domain Adaptationcited by 520
- 2023A Comprehensive Survey on Test-Time Adaptation under Distribution Shiftscited by 353
- 2021DAFormer: Improving Network Architectures and Training Strategies for Domain-Adaptive Semantic Segmentationcited by 299
- 2021A Fourier-based Framework for Domain Generalizationcited by 287
- 2021FedDG: Federated Domain Generalization on Medical Image Segmentation via Episodic Learning in Continuous Frequency Spacecited by 284
- 2021Global Filter Networks for Image Classificationcited by 257
- 2021FSDR: Frequency Space Domain Randomization for Domain Generalizationcited by 163
- 2022HRDA: Context-Aware High-Resolution Domain-Adaptive Semantic Segmentationcited by 163
- 2021Model Adaptation: Historical Contrastive Learning for Unsupervised Domain Adaptation without Source Datacited by 152
- 2021Self-supervised Augmentation Consistency for Adapting Semantic Segmentationcited by 149
- 2023Transformer-Based Visual Segmentation: A Surveycited by 124
- 2022SePiCo: Semantic-Guided Pixel Contrast for Domain Adaptive Semantic Segmentationcited by 87
38 more
- 2021Generalize then Adapt: Source-Free Domain Adaptive Semantic Segmentationcited by 81
- 2021Domain Adaptive Semantic Segmentation with Self-Supervised Depth Estimationcited by 80
- 2021PixMatch: Unsupervised Domain Adaptation via Pixelwise Consistency Trainingcited by 80
- 2021Intriguing Findings of Frequency Selection for Image Deblurringcited by 80
- 2021Context-Aware Mixup for Domain Adaptive Semantic Segmentationcited by 79
- 2022Semantic-Aware Domain Generalized Segmentationcited by 78
- 2022WildNet: Learning Domain Generalized Semantic Segmentation from the Wildcited by 75
- 2022Bending Reality: Distortion-aware Transformers for Adapting to Panoramic Semantic Segmentationcited by 71
- 2022Mitosis domain generalization in histopathology images -- The MIDOG challengecited by 66
- 2021Category Contrast for Unsupervised Domain Adaptation in Visual Taskscited by 65
- 2021FIBA: Frequency-Injection based Backdoor Attack in Medical Image Analysiscited by 60
- 2022PODA: Prompt-driven Zero-shot Domain Adaptationcited by 60
- 2022Balancing Discriminability and Transferability for Source-Free Domain Adaptationcited by 58
- 2024FreqMamba: Viewing Mamba from a Frequency Perspective for Image Derainingcited by 57
- 2021Towards Fewer Annotations: Active Learning via Region Impurity and Prediction Uncertainty for Domain Adaptive Semantic Segmentationcited by 56
- 2022CoSMix: Compositional Semantic Mix for Domain Adaptation in 3D LiDAR Segmentationcited by 54
- 2021DICE: Diversity in Deep Ensembles via Conditional Redundancy Adversarial Estimationcited by 48
- 2021RDA: Robust Domain Adaptation via Fourier Adversarial Attackingcited by 48
- 2022Class-Balanced Pixel-Level Self-Labeling for Domain Adaptive Semantic Segmentationcited by 47
- 2024Frequency-Assisted Mamba for Remote Sensing Image Super-Resolutioncited by 47
- 2022Cross Domain Object Detection by Target-Perceived Dual Branch Distillationcited by 46
- 2022Behind Every Domain There is a Shift: Adapting Distortion-aware Vision Transformers for Panoramic Semantic Segmentationcited by 46
- 2023Unmasking Anomalies in Road-Scene Segmentationcited by 45
- 2021Multi-Source Domain Adaptation with Collaborative Learning for Semantic Segmentationcited by 44
- 2022A Probabilistic Framework for Lifelong Test-Time Adaptationcited by 44
- 2021Multi-Target Domain Adaptation with Collaborative Consistency Learningcited by 43
- 2021Source-Free Open Compound Domain Adaptation in Semantic Segmentationcited by 43
- 2021Cross-View Regularization for Domain Adaptive Panoptic Segmentationcited by 41
- 2021ConDA: Unsupervised Domain Adaptation for LiDAR Segmentation via Regularized Domain Concatenationcited by 41
- 2022Deep Frequency Filtering for Domain Generalizationcited by 41
- 2022PiPa: Pixel- and Patch-wise Self-supervised Learning for Domain Adaptative Semantic Segmentationcited by 41
- 2021Cross-modal Learning for Domain Adaptation in 3D Semantic Segmentationcited by 40
- 2021Spectral Unsupervised Domain Adaptation for Visual Recognitioncited by 40
- 2023All for One, and One for All: UrbanSyn Dataset, the third Musketeer of Synthetic Driving Scenescited by 40
- 2025BRIGHT: A globally distributed multimodal building damage assessment dataset with very-high-resolution for all-weather disaster responsecited by 39
- 2022PASTA: Proportional Amplitude Spectrum Training Augmentation for Syn-to-Real Domain Generalizationcited by 38
- 2022Attention Consistency on Visual Corruptions for Single-Source Domain Generalizationcited by 37
- 2021Coarse-to-Fine Domain Adaptive Semantic Segmentation with Photometric Alignment and Category-Center Regularizationcited by 36
50 most cited of 540 All 540 (JSON)
- 2026LensBridge: Frequency-Guided Compound Degradation Adaptation for Lens Aberration Correction and Veiling Glare Removal29 Sep 2026
- 2026ICM: Intra-class Mixing for Domain Adaptation in Adverse Weather23 Sep 2026
- 2026Contour-Guided Spectral Routing for Robust Real-Time Pedestrian Detection13 Sep 2026
- 2026ARCOS: Zero-shot Boundary Localization for Corneal Layer Segmentation Across Optical Coherence Tomography Devices3 Sep 2026
- 2026FAN-LoRA: A Fourier-Adaptive Nonlinear Low-Rank Adaptor for Medical Foundation Model Domain Adaptation27 Aug 2026
- 2026MOSAIC: Modality-agnostic Spectral Alignment for Federated Image-level Weakly Supervised Tumor Segmentation under Client-specific Missing Modalities20 Aug 2026
- 2026Harnessing Magnitude-Only and Complex Measurements for Improved Dynamic MRI Reconstruction with Learned Priors18 Aug 2026
- 2026Fourier Self-Supervision for Fine-Grained Generalized Category Discovery9 Aug 2026
- 2026Weaving Light and Time: Unified Harmonic-Geometric Representation Learning for Dense RGB-Event Parsing10 Jul 2026
- 2026Beyond Random Sampling: Distribution-Aware Alignment for Semi-Supervised Medical Image Segmentation5 Jul 2026
- 2026APRIL-MedSeg: A Modular Medical Image Segmentation Toolbox Embracing Modern Paradigms29 Jun 2026
- 2026The Importance of Phase in Neural Representations: An Internal Oppenheim-Lim Test of Image Classifiers15 Jun 2026
38 more
- 2026Texture-Shape Bias Balancing for Robust Synthetic-to-Real Semantic Segmentation in Automotive NIR Imagery13 Jun 2026
- 2026FAF-CD: Frequency-Aware Fusion for Change Detection under Imperfect Multimodal Remote Sensing2 Jun 2026
- 2026FSM-Net: An Efficient Frequency-Spatial Network for Real-World Deblurring29 May 2026
- 2026Internally Referenced Low-Light Enhancement27 May 2026
- 2026Dance Across Shifts: Forward-Facilitation Continual Test-Time Adaptation through Dynamic Style Bridging18 May 2026
- 2026MoASE++: Mixture of Activation Sparsity Experts with Domain-Adaptive On-policy Distillation for Continual Test Time Adaptation18 May 2026
- 2026VISTA: Variance-Gated Inter-Sequence Test-Time Adaptation for Multi-Sequence MRI Segmentation17 May 2026
- 2026Dual-Foundation Models for Unsupervised Domain Adaptation5 May 2026
- 2026Breaking Watermarks in the Frequency Domain: A Modulated Diffusion Attack Framework24 Apr 2026
- 2026Latent Fourier Transform20 Apr 2026
- 2026Dual Strategies for Test-Time Adaptation19 Apr 2026
- 2026ASGNet: Adaptive Spectrum Guidance Network for Automatic Polyp Segmentation16 Apr 2026
- 2026RobustMedSAM: Degradation-Resilient Medical Image Segmentation via Robust Foundation Model Adaptation10 Apr 2026
- 2026HOT: Harmonic-Constrained Optimal Transport for Remote Photoplethysmography Domain Adaptation2 Apr 2026
- 2026BCMDA: Bidirectional Correlation Maps Domain Adaptation for Mixed Domain Semi-Supervised Medical Image Segmentation25 Mar 2026
- 2026MERIT: Multi-domain Efficient RAW Image Translation21 Mar 2026
- 2026Multiscale Switch for Semi-Supervised and Contrastive Learning in Medical Ultrasound Image Segmentation19 Mar 2026
- 2026Personalized Federated Learning with Residual Fisher Information for Medical Image Segmentation16 Mar 2026
- 2026Text-Phase Synergy Network with Dual Priors for Unsupervised Cross-Domain Image Retrieval13 Mar 2026
- 2026ABRA: Teleporting Fine-Tuned Knowledge Across Domains for Open-Vocabulary Object Detection12 Mar 2026
- 2026SPEGC: Continual Test-Time Adaptation via Semantic-Prompt-Enhanced Graph Clustering for Medical Image Segmentation12 Mar 2026
- 2026DDS-UDA: Dual-Domain Synergy for Unsupervised Domain Adaptation in Joint Segmentation of Optic Disc and Optic Cup7 Mar 2026
- 2026Rethinking Time Series Domain Generalization via Structure-Stratified Calibration3 Mar 2026
- 2026Cross-view geo-localization, Image retrieval, Multiscale geometric modeling, Frequency domain enhancement3 Mar 2026
- 2026Altitude-Adaptive Vision-Only Geo-Localization for UAVs in GPS-Denied Environments27 Feb 2026
- 2026FD-DB: Frequency-Decoupled Dual-Branch Network for Unpaired Synthetic-to-Real Domain Translation10 Feb 2026
- 2026Multi-Scale Global-Instance Prompt Tuning for Continual Test-time Adaptation in Medical Image Segmentation5 Feb 2026
- 2026MarkCleaner: High-Fidelity Watermark Removal via Imperceptible Micro-Geometric Perturbation2 Feb 2026
- 2026DSP-Reg: Domain-Sensitive Parameter Regularization for Robust Domain Generalization27 Jan 2026
- 2026Domain-invariant Mixed-domain Semi-supervised Medical Image Segmentation with Clustered Maximum Mean Discrepancy Alignment23 Jan 2026
- 2026SfMamba: Efficient Source-Free Domain Adaptation via Selective Scan Modeling13 Jan 2026
- 2026Unsupervised Domain Adaptation with SAM-RefiSeR for Enhanced Brain Tumor Segmentation11 Jan 2026
- 2026Decoupling Amplitude and Phase Attention in Frequency Domain for RGB-Event based Visual Object Tracking3 Jan 2026
- 2025Causal-Tune: Mining Causal Factors from Vision Foundation Models for Domain Generalized Semantic Segmentation18 Dec 2025
- 2025Adaptive Frequency Domain Alignment Network for Medical image segmentation18 Dec 2025
- 2025OMUDA: Omni-level Masking for Unsupervised Domain Adaptation in Semantic Segmentation13 Dec 2025
- 2025AQUA-Net: Adaptive Frequency Fusion and Illumination Aware Network for Underwater Image Enhancement5 Dec 2025
- 2025Fourier-Attentive Representation Learning: A Fourier-Guided Framework for Few-Shot Generalization in Vision-Language Models4 Dec 2025
50 newest of 540 All 540 (JSON)
- 2023Prompting Diffusion Representations for Cross-Domain Semantic Segmentationcited by 30
- 2023Diffusion-based Image Translation with Label Guidance for Domain Adaptive Semantic Segmentationcited by 27
- 2023Frequency Compensated Diffusion Model for Real-scene Dehazingcited by 17
- 2024RSHazeDiff: A Unified Fourier-aware Diffusion Model for Remote Sensing Image Dehazingcited by 6
- 2024Diffuse-UDA: Addressing Unsupervised Domain Adaptation in Medical Image Segmentation with Appearance and Structure Aligned Diffusion Modelscited by 6
- 2025Generalized Diffusion Detector: Mining Robust Features from Diffusion Models for Domain-Generalized Detectioncited by 6
- 2025FlowEO: Generative Unsupervised Domain Adaptation for Earth Observationcited by 3
- 2024ImPoster: Text and Frequency Guidance for Subject Driven Action Personalization using Diffusion Modelscited by 2
- 2025Boosting Domain Generalized and Adaptive Detection with Diffusion Models: Fitness, Generalization, and Transferabilitycited by 2
- 2025MFM-DA: Instance-Aware Adaptor and Hierarchical Alignment for Efficient Domain Adaptation in Medical Foundation Modelscited by 1
- 2025Noise Optimized Conditional Diffusion for Domain Adaptationcited by 1
- 2025FlowEO: Generative Unsupervised Domain Adaptation for Earth Observation1 Dec 2025
- 2025Boosting Domain Generalized and Adaptive Detection with Diffusion Models: Fitness, Generalization, and Transferability26 Jun 2025
- 2025Noise Optimized Conditional Diffusion for Domain Adaptation12 May 2025
- 2025Generalized Diffusion Detector: Mining Robust Features from Diffusion Models for Domain-Generalized Detection3 Mar 2025
- 2025MFM-DA: Instance-Aware Adaptor and Hierarchical Alignment for Efficient Domain Adaptation in Medical Foundation Models2 Mar 2025
- 2024ImPoster: Text and Frequency Guidance for Subject Driven Action Personalization using Diffusion Models24 Sep 2024
- 2024Diffuse-UDA: Addressing Unsupervised Domain Adaptation in Medical Image Segmentation with Appearance and Structure Aligned Diffusion Models12 Aug 2024
- 2024RSHazeDiff: A Unified Fourier-aware Diffusion Model for Remote Sensing Image Dehazing15 May 2024
- 2023Diffusion-based Image Translation with Label Guidance for Domain Adaptive Semantic Segmentation23 Aug 2023
- 2023Frequency Compensated Diffusion Model for Real-scene Dehazing21 Aug 2023
- 2023Prompting Diffusion Representations for Cross-Domain Semantic Segmentation5 Jul 2023
- 2024FreqMamba: Viewing Mamba from a Frequency Perspective for Image Derainingcited by 57
- 2024Frequency-Assisted Mamba for Remote Sensing Image Super-Resolutioncited by 47
- 2024FourierMamba: Fourier Learning Integration with State Space Models for Image Derainingcited by 32
- 2024MMR-Mamba: Multi-Modal MRI Reconstruction with Mamba and Spatial-Frequency Information Fusioncited by 15
- 2026SfMamba: Efficient Source-Free Domain Adaptation via Selective Scan Modelingcited by 0
- 2026SfMamba: Efficient Source-Free Domain Adaptation via Selective Scan Modeling13 Jan 2026
- 2024MMR-Mamba: Multi-Modal MRI Reconstruction with Mamba and Spatial-Frequency Information Fusion27 Jun 2024
- 2024FourierMamba: Fourier Learning Integration with State Space Models for Image Deraining29 May 2024
- 2024Frequency-Assisted Mamba for Remote Sensing Image Super-Resolution8 May 2024
- 2024FreqMamba: Viewing Mamba from a Frequency Perspective for Image Deraining15 Apr 2024
- 2022Continual Test-Time Domain Adaptationcited by 520
- 2023A Comprehensive Survey on Test-Time Adaptation under Distribution Shiftscited by 353
- 2021DAFormer: Improving Network Architectures and Training Strategies for Domain-Adaptive Semantic Segmentationcited by 299
- 2021A Fourier-based Framework for Domain Generalizationcited by 287
- 2021FedDG: Federated Domain Generalization on Medical Image Segmentation via Episodic Learning in Continuous Frequency Spacecited by 284
- 2021Global Filter Networks for Image Classificationcited by 257
- 2021FSDR: Frequency Space Domain Randomization for Domain Generalizationcited by 163
- 2022HRDA: Context-Aware High-Resolution Domain-Adaptive Semantic Segmentationcited by 163
- 2021Model Adaptation: Historical Contrastive Learning for Unsupervised Domain Adaptation without Source Datacited by 152
- 2021Self-supervised Augmentation Consistency for Adapting Semantic Segmentationcited by 149
- 2023Transformer-Based Visual Segmentation: A Surveycited by 124
- 2022SePiCo: Semantic-Guided Pixel Contrast for Domain Adaptive Semantic Segmentationcited by 87
12 most cited of 519 All 519 (JSON)
- 2026LensBridge: Frequency-Guided Compound Degradation Adaptation for Lens Aberration Correction and Veiling Glare Removal29 Sep 2026
- 2026ICM: Intra-class Mixing for Domain Adaptation in Adverse Weather23 Sep 2026
- 2026Contour-Guided Spectral Routing for Robust Real-Time Pedestrian Detection13 Sep 2026
- 2026ARCOS: Zero-shot Boundary Localization for Corneal Layer Segmentation Across Optical Coherence Tomography Devices3 Sep 2026
- 2026FAN-LoRA: A Fourier-Adaptive Nonlinear Low-Rank Adaptor for Medical Foundation Model Domain Adaptation27 Aug 2026
- 2026MOSAIC: Modality-agnostic Spectral Alignment for Federated Image-level Weakly Supervised Tumor Segmentation under Client-specific Missing Modalities20 Aug 2026
- 2026Harnessing Magnitude-Only and Complex Measurements for Improved Dynamic MRI Reconstruction with Learned Priors18 Aug 2026
- 2026Fourier Self-Supervision for Fine-Grained Generalized Category Discovery9 Aug 2026
- 2026Weaving Light and Time: Unified Harmonic-Geometric Representation Learning for Dense RGB-Event Parsing10 Jul 2026
- 2026Beyond Random Sampling: Distribution-Aware Alignment for Semi-Supervised Medical Image Segmentation5 Jul 2026
- 2026APRIL-MedSeg: A Modular Medical Image Segmentation Toolbox Embracing Modern Paradigms29 Jun 2026
- 2026The Importance of Phase in Neural Representations: An Internal Oppenheim-Lim Test of Image Classifiers15 Jun 2026
12 newest of 519 All 519 (JSON)