Progressive Alignment Degradation Learning for Pansharpening

Enzhe Zhao; Zhichang Guo; Yao Li; Fanghui Song; Boying Wu

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arXiv · 2506.20179

Progressive Alignment Degradation Learning for Pansharpening

Enzhe Zhao·Zhichang Guo·Yao Li·Fanghui Song·Boying Wu

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Abstract

Deep learning-based pansharpening has been shown to effectively generate high-resolution multispectral (HRMS) images. To create supervised ground-truth HRMS images, synthetic data generated using the Wald protocol is commonly employed. This protocol assumes that networks trained on artificial low-resolution data will perform equally well on high-resolution data. However, well-trained models typically exhibit a trade-off in performance between reduced-resolution and full-resolution datasets. In this paper, we delve into the Wald protocol and find that its inaccurate approximation of real-world degradation patterns limits the generalization of deep pansharpening models. To address this issue, we propose the Progressive Alignment Degradation Module (PADM), which uses mutual iteration between two sub-networks, PAlignNet and PDegradeNet, to adaptively learn accurate degradation processes without relying on predefined operators. Building on this, we introduce HFreqdiff, which embeds high-frequency details into a diffusion framework and incorporates CFB and BACM modules for frequency-selective detail extraction and precise reverse process learning. These innovations enable effective integration of high-resolution panchromatic and multispectral images, significantly enhancing spatial sharpness and quality. Experiments and ablation studies demonstrate the proposed method's superior performance compared to state-of-the-art techniques.

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BibTeX RIS

Enzhe Zhao, Zhichang Guo, Yao Li, Fanghui Song, Boying Wu. 2025-06-25. Progressive Alignment Degradation Learning for Pansharpening. https://arxiv.org/abs/2506.20179

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