FRANet: A Feature Refinement Attention Network for SAR Image Denoising

Since synthetic aperture radar (SAR) images have complex noise and have no clean reference images, SAR image denoising is very challenging. With the development of deep learning, several denoising algorithms based on deep learning are proposed to achieve a better SAR image denoising effect. However,...

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Bibliographic Details
Published in:IEEE journal of selected topics in applied earth observations and remote sensing Vol. 18; pp. 12343 - 12363
Main Authors: Liu, Shuaiqi, Lei, Yu, Hu, Qi, Liu, Ming, Li, Bing, Hu, Weiming, Zhang, Yu-Dong
Format: Journal Article
Language:English
Published: Piscataway IEEE 2025
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Attention encoder–decoder network
Coders
Convolutional neural networks
Deep learning
Feature extraction
feature refinement
image denoising
Information retrieval
Machine learning
Noise
Noise measurement
Noise reduction
Radar imaging
Radar polarimetry
Receptive field
Run time (computers)
SAR (radar)
Speckle
Synthetic aperture radar
synthetic aperture radar (SAR)
Training
Transforms
ISSN:1939-1404, 2151-1535
Online Access:Get full text
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Summary:Since synthetic aperture radar (SAR) images have complex noise and have no clean reference images, SAR image denoising is very challenging. With the development of deep learning, several denoising algorithms based on deep learning are proposed to achieve a better SAR image denoising effect. However, most networks are prone to gradient disappearance and explosion in the training process. The deep network model will produce an excessive amount of computation. The denoising time is also too long. Since most of the denoising algorithms based on deep learning use simulated images for model training, it is difficult to effectively suppress speckle noise in the real SAR image while a balance between denoising and detail preservation cannot be achieved. To address the mentioned problems, we propose a novel feature refinement attention network named FRANet. In FRANet, a feature refinement network is first used to refine the input noise image to extract more useful features while accelerating network training. Second, a feature attention encoder-decoder network is constructed for deep feature extraction. This network uses an asymmetric encoder-decoder structure to expand the receptive field, which can improve the information extraction ability and reduce the number of parameters effectively. Finally, the final denoised SAR image is obtained by global residual learning. Compared with other denoising algorithms, the proposed algorithm can achieve better results in denoising performance and running time.
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ISSN:1939-1404
2151-1535
DOI:10.1109/JSTARS.2025.3564846