Abstract
Advancements in image sensing have elevated the importance of Ultra-High-Definition Image Restoration (UHD IR). Traditional methods, such as extreme downsampling or transformation from the spatial to the frequency domain, encounter significant drawbacks: downsampling induces irreversible information loss in UHD images, while our frequency analysis reveals that pure frequency-domain approaches are ineffective for spatially confined image artifacts, primarily due to the loss of degradation locality. To overcome these limitations, we present RetinexDual, a novel Retinex theory-based framework designed for generalized UHD IR tasks. RetinexDual leverages two complementary sub-networks: the Scale-Attentive maMBA (SAMBA) and the Frequency Illumination Adaptor (FIA). SAMBA, responsible for correcting the reflectance component, utilizes a coarse-to-fine mechanism to overcome the causal modeling of mamba, which effectively reduces artifacts and restores intricate details. On the other hand, FIA ensures precise correction of color and illumination distortions by operating in the frequency domain and leveraging the global context provided by it. Evaluating RetinexDual on four UHD IR tasks, namely deraining, deblurring, dehazing, and Low-Light Image Enhancement (LLIE), shows that it outperforms recent methods qualitatively and quantitatively. Ablation studies demonstrate the importance of employing distinct designs for each branch in RetinexDual, as well as the effectiveness of its various components.
Abstract (translated)
在图像传感技术的进步推动下，超高清图像恢复（UHD IR）的重要性日益增加。传统方法，如极端降采样或从空间域转换到频率域的方法，在实际应用中遇到了显著的局限性：降采样会导致超高清图像中的不可逆信息损失；而我们的频谱分析表明，纯粹基于频率域的方法对于处理局部化退化的图像缺陷无效，主要是因为它们丢失了损坏的具体位置信息。为了解决这些问题，我们提出了RetinexDual，这是一种新型框架，基于Retinex理论设计用于通用的UHD IR任务。 RetinexDual采用两个互补的子网络：尺度注意多级双边滤波器（Scale-Attentive maMBA, SAMBA）和频率光照适配器（Frequency Illumination Adaptor, FIA）。SAMBA负责校正反射分量，通过从粗到细的工作机制克服了mamba模型的因果限制，从而有效地减少了伪影并恢复细节。另一方面，FIA在频域中操作，并利用全局上下文来确保准确地纠正颜色和光照失真。 通过对雨线移除、模糊消除、雾霾去除以及低光图像增强（LLIE）这四个UHD IR任务进行评估，RetinexDual在定性和定量分析上都优于最近的方法。消融研究展示了在RetinexDual中为每个分支采用不同设计的重要性，并证明了其各个组件的有效性。
URL
https://arxiv.org/abs/2508.04797
