arXiv:2501.12235cs.CVeess.IV2025-01被引 5

提出双分支Transformer网络,同时优化光照与结构,提升暗光图像质量。

DLEN: Dual Branch of Transformer for Low-Light Image Enhancement in Dual Domains

  • 双分支结构分别处理光照与结构,结合空间和频域注意力。
  • 引入可学习小波变换模块,保留高低频特征,增强边缘纹理细节。
  • 在标准数据集上超越现有方法,适合图像增强与视觉任务前处理。

低光图像增强(LLE)旨在改善弱光环境下拍摄图像的视觉质量,此类图像常存在亮度低、对比度差、噪声大及色彩失真等问题,影响目标检测、人脸识别和自动驾驶等计算机视觉任务的表现。传统方法如多尺度融合与直方图均衡化难以保持细节且易破坏自然外观;尽管Retinex理论提供图像分解基础,但常放大噪声,导致图像质量不佳。本文提出双光增强网络(DLEN),引入两种不同注意力机制,同时考虑空间与频域信息。模型在光照估计阶段加入可学习小波变换模块,有效保留高低频成分,提升边缘与纹理细节。此外,设计双分支结构,利用Transformer架构分别增强光照与结构成分。大量实验表明,该模型在标准基准上优于现有先进方法。代码已开源:https://github.com/LaLaLoXX/DLEN。

原文摘要 · Abstract (English)

Low-light image enhancement (LLE) aims to improve the visual quality of images captured in poorly lit conditions, which often suffer from low brightness, low contrast, noise, and color distortions. These issues hinder the performance of computer vision tasks such as object detection, facial recognition, and autonomous driving.Traditional enhancement techniques, such as multi-scale fusion and histogram equalization, fail to preserve fine details and often struggle with maintaining the natural appearance of enhanced images under complex lighting conditions. Although the Retinex theory provides a foundation for image decomposition, it often amplifies noise, leading to suboptimal image quality. In this paper, we propose the Dual Light Enhance Network (DLEN), a novel architecture that incorporates two distinct attention mechanisms, considering both spatial and frequency domains. Our model introduces a learnable wavelet transform module in the illumination estimation phase, preserving high- and low-frequency components to enhance edge and texture details. Additionally, we design a dual-branch structure that leverages the power of the Transformer architecture to enhance both the illumination and structural components of the image.Through extensive experiments, our model outperforms state-of-the-art methods on standard benchmarks.Code is available here: https://github.com/LaLaLoXX/DLEN

图像增强Transformer小波变换暗光处理

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