提出双阶段框架,提升高分辨率图像去雾的全局与局部细节融合能力。
Dual-Stage Global and Local Feature Framework for Image Dehazing
- 分两阶段处理:先全局上下文建模,再局部细节增强
- 在高分辨率数据集上显著提升PSNR,改善视觉质量
- 可通用接入各类去雾模型,适合大图去雾应用
针对数字图像中大气雾霾去除(图像去雾)问题,尽管现有模型表现良好,但对高分辨率图像的研究仍不足。通常需降采样或分块处理,导致性能下降,根源在于高分辨率下难以有效融合全局上下文与局部细粒度信息。本文提出一种新型框架SGLC(Streamlined Global and Local Features Combinator),由全局特征生成器(GFG)和局部特征增强器(LFE)组成。GFG基于场景整体语义生成初步去雾结果,随后LFE通过增强像素级细节,优化局部结构。将SGLC集成至Uformer架构,在高分辨率数据集上实验显示,峰值信噪比(PSNR)显著提升,验证其在大规模图像去雾中的有效性。该设计具备模型无关性,可广泛嵌入各类去雾网络,同时利用场景级线索与精细纹理,大幅提升高分辨率场景的视觉保真度。
原文摘要 · Abstract (English)
Addressing the challenge of removing atmospheric fog or haze from digital images, known as image dehazing, has recently gained significant traction in the computer vision community. Although contemporary dehazing models have demonstrated promising performance, few have thoroughly investigated high-resolution imagery. In such scenarios, practitioners often resort to downsampling the input image or processing it in smaller patches, which leads to a notable performance degradation. This drop is primarily linked to the difficulty of effectively combining global contextual information with localized, fine-grained details as the spatial resolution grows. In this chapter, we propose a novel framework, termed the Streamlined Global and Local Features Combinator (SGLC), to bridge this gap and enable robust dehazing for high-resolution inputs. Our approach is composed of two principal components: the Global Features Generator (GFG) and the Local Features Enhancer (LFE). The GFG produces an initial dehazed output by focusing on broad contextual understanding of the scene. Subsequently, the LFE refines this preliminary output by enhancing localized details and pixel-level features, thereby capturing the interplay between global appearance and local structure. To evaluate the effectiveness of SGLC, we integrated it with the Uformer architecture, a state-of-the-art dehazing model. Experimental results on high-resolution datasets reveal a considerable improvement in peak signal-to-noise ratio (PSNR) when employing SGLC, indicating its potency in addressing haze in large-scale imagery. Moreover, the SGLC design is model-agnostic, allowing any dehazing network to be augmented with the proposed global-and-local feature fusion mechanism. Through this strategy, practitioners can harness both scene-level cues and granular details, significantly improving visual fidelity in high-resolution environments.
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