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Reciprocal translation between SAR and optical remote sensing images with cascaded-residual adversarial networks

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Abstract

Despite the advantages of all-weather and all-day high-resolution imaging, synthetic aperture radar (SAR) images are much less viewed and used by general people because human vision is not adapted to microwave scattering phenomenon. However, expert interpreters can be trained by comparing side-by-side SAR and optical images to learn the mapping rules from SAR to optical. This paper attempts to develop machine intelligence that is trainable with large-volume co-registered SAR and optical images to translate SAR images to optical version for assisted SAR image interpretation. Reciprocal SAR-optical image translation is a challenging task because it is a raw data translation between two physically very different sensing modalities. Inspired by recent progresses in image translation studies in computer vision, this paper tackles the problem of SAR-optical reciprocal translation with an adversarial network scheme where cascaded residual connections and hybrid L1-GAN loss are employed. It is trained and tested on both spaceborne Gaofen-3 (GF-3) and airborne Uninhabited Airborne Vehicle Synthetic Aperture Radar (UAVSAR) images. Results are presented for datasets of different resolutions and polarizations and compared with other state-of-the-art methods. The Frechet inception distance (FID) is used to quantitatively evaluate the translation performance. The possibility of unsupervised learning with unpaired/unregistered SAR and optical images is also explored. Results show that the proposed translation network works well under many scenarios and it could potentially be used for assisted SAR interpretation.

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Acknowledgements

This work was supported in part by National Key R&D Program of China (Grant No. 2017YFB0502703) and Natural Science Foundation of China (Grant Nos. 61822107, 61571134).

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Authors and Affiliations

  1. Key Lab for Information Science of Electromagnetic Waves (MoE), Fudan University, Shanghai, 200433, China

    Shilei Fu, Feng Xu & Ya-Qiu Jin

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  1. Shilei Fu
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  2. Feng Xu
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  3. Ya-Qiu Jin
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Correspondence to Feng Xu.

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Fu, S., Xu, F. & Jin, YQ. Reciprocal translation between SAR and optical remote sensing images with cascaded-residual adversarial networks. Sci. China Inf. Sci. 64, 122301 (2021). https://doi.org/10.1007/s11432-020-3077-5

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  • DOI: https://doi.org/10.1007/s11432-020-3077-5

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