摘要
针对水下环境采集图像和视频存在对比度低、色彩不均衡等颜色失真问题,提出了一种自适应色彩均衡与水下场景深度估计融合的水下图像增强算法。该算法的核心思想由3个步骤组成:首先针对图像色偏严重问题,对色偏严重的通道进行颜色自适应均衡化预处理,以突出纹理特征;其次,根据图像整体的纹理分布特性进行特征提取,并对图像通道进行背景光估计、场景深度估计以及传输系数映射估计;最后,采用场景亮度恢复模型进行特征融合,并基于直方图均衡算法得到水下增强图像。为证明该算法的有效性与先进性,选取真实水下降质图像为处理对象,利用质量评价指标(UIQM)对增强图像进行总体比较。结果表明,该算法有效增强了水下降质图像的清晰度与色彩度,并且清晰地恢复了图像细节。
To solve the problem of color distortion such as low contrast and color imbalance in photos and videos taken in an underwater setting a method of underwater image enhancement is proposed which combines adaptive color equalization with depth measurement in the underwater scene.The method is composed of the following three steps.Firstly regarding the issue of severe visual color bias the preprocessing of adaptive color equalization is conducted on the channels with severe color bias to highlight the texture features.Secondly according to the images general texture distribution characteristics feature extraction is conducted and background light estimation scene depth estimation and transmission coefficient mapping estimation are conducted on the images channels.Finally the scene brightness recovery model is used for feature fusion and the histogram equalization algorithm is used to obtain the enhanced underwater images.In order to prove the effectiveness and advancement of the method real underwater degraded images are selected as the processing object and the enhanced images are compared in general by using the quality evaluation index of UIQM.The results show that the algorithm effectively enhances the sharpness and chromaticity of the underwater degraded images and clearly restores the image details.
作者
陈祖国
李俊杰
卢明
陈超洋
邹莹
陈娟
CHEN Zuguo;LI Junjie;LU Ming;CHEN Chaoyang;ZOU Ying;CHEN Juan(School of Information and Electrical Engineering Hunan University of Science and Technology,Xiangtan 411000 China;Shenzhen Institute of Advanced Technology Chinese Academy of Sciences,Shenzhen 518000 China)
出处
《电光与控制》
CSCD
北大核心
2024年第2期118-124,共7页
Electronics Optics & Control
基金
湖南省教育厅优秀青年项目(21B0456)
湖南省自然科学基金青年项目(2020 JJ5201)
深圳市自然科学基金(JCYJ20210324101215039)。
关键词
水下图像增强
自适应色彩均衡
场景亮度恢复公式
直方图均衡
水下质量评价指标
underwater image enhancement
adaptive color equalization
scene brightness recovery formula
histogram equalization
underwater quality evaluation index
