基于霾层学习的单幅图像去雾算法  

Single Image Dehazing Algorithm Based on the Learning of Hazy Layers

作　　者：肖进胜[1] 周景龙 雷俊锋[1] 刘恩雨 舒成 XIAO Jin-sheng;ZHOU Jing-long;LEI Jun-feng;LIU En-yu;SHU Cheng(School of Electronic Informcition, Wuhan University, Wuhan, Hubei 430072, China)

机构地区：[1]武汉大学电子信息学院

出　　处：《电子学报》2019年第10期2142-2148,共7页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61471272)

摘　　要：针对传统去雾算法出现色彩失真、去雾不完全、出现光晕等现象,本文提出了一种基于霾层学习的卷积神经网络的单幅图像去雾算法.首先,依据大气散射物理模型进行理论推导,本文设计了一种能够直接学习和估计有雾图像和霾层图像之间的映射关系的网络模型.采用有雾图像作为输入,并输出有雾图像与无雾图像之间的残差图像,随后直接从有雾图像中去除此霾层图像,即可恢复出无雾图像.残差学习的引入,使得网络来直接估计初始霾层,利用相对大的学习率,减少计算量,加快收敛过程.再利用引导滤波进行细化,使得恢复出的无雾图像更接近真实场景.本文对不同雾浓度的有雾图片的去雾效果进行测试,并与当前主流深度学习去雾算法及其他经典算法进行对比.实验结果显示,本文设计的卷积神经网络模型在图像去雾的应用,不论在主观效果还是客观指标上,都有优势.Considering the disadvantage of traditional dehazing algorithm,a single image dehazing algorithm based on haze layers learning is proposed.According to the atmospheric scattering model,the end-to-end network is designed which directly learn the mapping between the haze images and their corresponding haze layers.The network takes the haze image as the input.Then the recovered haze-free image can be gotten by removing the residual image from the hazy image.Residual learning allows the network to estimate the initial haze layer with relatively high learning rates,which can reduce computational complexity and speed up the convergence process.Otherwise,we use guided filter to refine images avoiding halos and block artifacts,which make the recovered image more similar to the real scene.Finally,the experimental results are analyzed and contrasted carefully.In this paper,the effect on fog images with different fog density is tested,and many comparisons are listed with other classical algorithms.Experiments demonstrate that the proposed algorithm has better results than state-of-the-art methods on both synthetic and real-world images qualitatively and quantitatively.

关 键 词：图像去雾 深度学习 卷积神经网络 残差学习 端到端系统 

分 类 号：TN911[电子电信—通信与信息系统]