This repo contains the codes for the paper: W-NetPan: Double-U Network for Inter-sensor Self-supervised Pan-sharpening. The increasing availability of remote sensing data allows dealing with spatial-spectral limitations by means of pan-sharpening methods. However, fusing inter-sensor data poses important challenges, in terms of resolution differences, sensor-dependent deformations and ground-truth data availability, that demand more accurate pan-sharpening solutions. In response, this paper proposes a novel deep learning-based pan-sharpening model which is termed as the double-U network for self-supervised pan-sharpening (W-NetPan). In more details, the proposed architecture adopts an innovative W-shape that integrates two U-Net segments which sequentially work for spatially matching and fusing inter-sensor multi-modal data. In this way, a synergic effect is produced where the first segment resolves inter-sensor deviations while stimulating the second one to achieve a more accurate data fusion. Additionally, a joint loss formulation is proposed for effectively training the proposed model without external data supervision. The experimental comparison, conducted over four coupled Sentinel-2 and Sentinel-3 datasets, reveals the advantages of W-NetPan with respect to several of the most important state-of-the-art pan-sharpening methods available in the literature.

./codes/model.py contains the proposed W-NetPAN model.

./codes/main_demo.py is a sample of the main script.

@article{fernandez2023w,
  title={W-NetPan: Double-U network for inter-sensor self-supervised pan-sharpening},
  author={Fernandez-Beltran, Ruben and Fernandez, Rafael and Kang, Jian and Pla, Filiberto},
  journal={Neurocomputing},
  volume={530},
  pages={125--138},
  year={2023},
  publisher={Elsevier}
}

[1] Javan, F. D., Samadzadegan, F., Mehravar, S., Toosi, A., Khatami, R., & Stein, A. (2021). A review of image fusion techniques for pan-sharpening of high-resolution satellite imagery. ISPRS journal of photogrammetry and remote sensing, 171, 101-117.

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