基于散斑场退化补偿的水下鬼成像  

Underwater Ghost Imaging Based on Speckle Degradation Compensation

作　　者：李育亮 齐金泉 陈明亮[1] 邓陈进 邵学辉 陶邦一 韩申生[1,2,5] Li Yuliang;Qi Jinquan;Chen Mingliang;Deng Chenjin;Shao Xuehui;Tao Bangyi;Han Shensheng(CAS Key Laboratory of Quantum Optics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;National Laboratory of Aerospace Intelligent Control Technology,Beijing 100089,China;State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,Zhejiang,China;School of Physics and Optoelectronic Engineering,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,Zhejiang,China)

机构地区：[1]中国科学院上海光学精密机械研究所量子光学重点实验室,上海201800 [2]中国科学院大学材料与光电研究中心,北京100049 [3]宇航智能控制技术国防科技重点实验室,北京100089 [4]自然资源部第二海洋研究所卫星海洋环境动力学国家重点实验室,浙江杭州310012 [5]中国科学院大学杭州高等研究院物理与光电工程学院,浙江杭州310024

出　　处：《光学学报》2024年第6期42-51,共10页Acta Optica Sinica

基　　金：国家自然科学基金(61991454);中国科学院创新交叉团队项目。

摘　　要：针对水下鬼成像重构质量下降、分辨率退化的问题,分析水体对散斑场传播的作用,提出在重构计算前将参考臂散斑进行校正的方法,以实现对物臂散斑场的退化补偿,进而提高水下鬼成像的成像质量。首先根据近似的S-S(SahuShanmugam)散射相函数和Wells模型推导得到调制传递函数,用来描述水体对散斑的退化作用;然后对参考臂散斑场进行校正补偿,使参考臂散斑与物臂散斑具有相同的退化程度以恢复关联性;最后采用校正后的参考臂散斑进行图像重构。从理论上证明了所提方法在二阶关联计算中会使得图像退化加剧,而在基于伪逆的重构计算中则可以有效提高图像分辨率、改善图像质量。通过仿真和实验验证了理论模型的正确性,该研究为远距离水下目标鬼成像图像恢复提供了新的思路。Objective For the problem of poor reconstruction quality and resolution degradation of underwater ghost imaging,an underwater ghost imaging method based on speckle degradation compensation was proposed to recover the target image degraded by the water body.Compared with ghost imaging in air medium,underwater ghost imaging has been studied by scholars in many aspects,such as the absorption effect of the water body,signal-to-noise ratio detection of the system,backward scattering noise,underwater illumination spot,and underwater turbulence.Image degradation and recovery methods based on underwater optical transmission models have been used in array detector optical imaging.However,there is no relevant study to analyze and solve the problem of degradation of underwater ghost imaging starting from the inherent optical properties of the water body.The scattering effect of the water body on the beam reduces the contrast of the speckles shining on the surface of the target and degrades the resolution,which deteriorates the intensity fluctuation characteristics of the target obtained by bucket detection,thus affecting the reconstruction quality of ghost imaging.Therefore,we hope to recover the underwater ghost imaging results affected by the water body through a method similar to deconvolution by introducing a point spread function(PSF)related to the intrinsic optical parameters of the water body.Methods In this research,the water body scattering degradation model was introduced into the ghost imaging image reconstruction to improve the image quality.First,the S-S(Sahu-Shanmugam)scattering phase function was linearly approximated in logarithmic coordinates in a small angular range(0.1°-5°).Then,the Hankel transform of the scattering phase function was substituted into the Wells modulation transfer function(MTF)model to obtain the modulation transfer function for image propagation in water.The MTF is a frequency domain expression of the PSF,which can better describe the degradation effect of real seawater on the scatter

关 键 词：海洋光学 水下鬼成像 散斑场退化补偿 水体调制传递函数 二阶关联 伪逆 

分 类 号：O436[机械工程—光学工程]