Enhanced imaging through turbid water based on quadrature lock-in discrimination and retinex aided by adaptive gamma function for illumination correction  

作　　者：Riffat Tehseen Amjad Ali Mithilesh Mane 葛文敏 李燕龙 张泽君 徐敬 Riffat Tehseen;Amjad Ali;Mithilesh Mane;Wenmin Ge;Yanlong Li;Zejun Zhang;Jing Xu(Optical Communication Laboratory,Ocean College,Zhejiang University,Zhoushan 316021,China;Hainan Institute of Zhejiang University,Sanya 572000,China;Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province,Ocean College,Zhejiang University,Zhoushan 316021,China)

机构地区：[1]Optical Communication Laboratory,Ocean College,Zhejiang University,Zhoushan 316021,China [2]Hainan Institute of Zhejiang University,Sanya 572000,China [3]Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province,Ocean College,Zhejiang University,Zhoushan 316021,China

出　　处：《Chinese Optics Letters》2023年第10期24-29,共6页中国光学快报（英文版）

基　　金：supported in part by the National Key Research and Development Program of China(Nos.2022YFC2808200 and 2022YFB2903403);the National Natural Science Foundation of China(NSFC)(No.61971378);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA22030208).

摘　　要：This paper presents an improved method for imaging in turbid water by using the individual strengths of the quadrature lock-in discrimination(QLD)method and the retinex method.At first,the high-speed QLD is performed on images,aiming at capturing the ballistic photons.Then,we perform the retinex image enhancement on the QLD-processed images to enhance the contrast of the image.Next,the effect of uneven illumination is suppressed by using the bilateral gamma function for adaptive illumination correction.The experimental results depict that the proposed approach achieves better enhancement than the existing approaches,even in a high-turbidity environment.

关 键 词：quadrature lock-in discrimination clear vision scattering RETINEX uneven illumination 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]