面向近场SAR图像伪影消除的超分辨率重建网络

    Near field SAR image super resolution reconstruction network for artifact elimination

    • 摘要: 毫米波近场合成孔径雷达(Synthetic Aperture Radar, SAR)成像技术在安检领域具有重要应用价值。但其成像结果普遍存在分辨率受限、伪影干扰的问题。单纯进行超分辨率重建容易放大图像伪影干扰,仅进行伪影抑制又会丢失目标细节,难以兼顾图像清晰度与成像保真度,亟需实现超分重建与伪影抑制的协同优化。针对该问题,文中提出一种面向噪声抑制与伪影消除的近场SAR图像超分辨率重建方法。文中以真实场景增强型超分辨率生成对抗网络(Real Enhanced Super-Resolution Generative Adversarial Network, Real-ESRGAN)为基础,在生成器中嵌入自适应伪影抑制模块(Adaptive Artifact Suppression Module, AASM),基于数据驱动的策略实现SAR图像伪影与噪声的精准辨识与自适应抑制;同时构建稀疏伪影抑制损失函数,通过抑制图像高频冗余分量,有效弱化暗区伪影干扰。通过×2与×4超分任务实验结果表明,所提方法在主客观核心指标上均优于对比算法,可为毫米波近场SAR图像质量优化提供可行技术方案。

       

      Abstract: Millimeter wave near-field synthetic aperture radar (SAR) imaging technology has important application value in the field of security inspection. However, the imaging results generally have the problems of limited resolution and artifact interference. It is easy to magnify the image artifact interference only by super-resolution reconstruction, and it will lose the target details only by artifact suppression, which is difficult to take into account the image definition and image fidelity. It is urgent to realize the collaborative optimization of super-resolution reconstruction and artifact suppression. To solve this problem, this paper proposes a near-field SAR image super-resolution reconstruction method for noise suppression and artifact elimination. Based on the real enhanced super-resolution generative adversarial network (Real-ESRGAN), this paper embeds the adaptive artifact suppression module (AASM) in the generator, and realizes the accurate identification and adaptive suppression of SAR image artifacts and noise based on the data-driven strategy; At the same time, the sparse artifact suppression loss function is constructed to effectively weaken the dark area artifact interference by suppressing the high-frequency redundant components of the image. The experimental results of ×2 and ×4 super sub tasks show that the proposed method is superior to the comparison algorithm in both subjective and objective core indexes, and can provide a feasible technical scheme for the optimization of millimeter wave near-field SAR image quality.

       

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