计算偏振彩色傅里叶叠层成像:散射光场偏振特性的复用技术  

Computational polarized colorful Fourier ptychography imaging:a novel information reuse technique of polarization of scattering light field

作　　者：相萌 何飘 王天宇 袁琳 邓凯 刘飞[1,2,4] 邵晓鹏 Xiang Meng;He Piao;Wang Tian-Yu;Yuan Lin;Deng Kai;Liu Fei;Shao Xiao-Peng(School of Optoelectronic Engineering,Xidian Univeristy,Xi’an 710071,China;Xi’an Key Laboratory of Computational Imaging,Xi’an 710071,China;Key Laboratory of Space Precision Measurement Technology,Chinese Academy of Sciences,Xi’an 710119,China;Hangzhou Institute of Technology,Xidian University,Hangzhou 311200,China)

机构地区：[1]西安电子科技大学光电工程学院,西安710071 [2]西安市计算成像重点实验室,西安710071 [3]中国科学院空间精密测量技术重点实验室,西安710119 [4]西安电子科技大学杭州研究院,杭州311200

出　　处：《物理学报》2024年第12期180-189,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62205259,62075175,61975254,62105254);中国科学院空间精密测量技术重点实验室开放基金资助的课题。

摘　　要：针对目前透过散射介质成像技术中宽谱导致目标信息被淹没于背景干扰中,且散射对波长的敏感性使得频谱信息混叠产生的色彩畸变严重,无法实现彩色超分辨率成像的问题,提出了基于散射光场偏振信息复用的计算偏振彩色傅里叶叠层成像技术.该技术深入地分析散射场的强度及偏振分布特性,综合利用散射场中目标与背景干扰的偏振信息差异性和唯一性表征,结合光场的偏振共模抑制特性和偏振的波长相关性,分通道实现宽谱散射场中的背景干扰信息和目标信息的有效分离.此外,深度挖掘散射光场中频谱信息的差异性,利用傅里叶叠层技术实现散射光场频谱信息拼接,进而获得透过散射介质的彩色高分辨率成像效果.实验结果表明,该方法不仅能够实现透过散射介质的超分辨率重建,而且偏振信息的复用对于谱宽造成的信号混叠有明显的抑制作用,大幅提升了重建图像的信噪比和对比度,抑制了色彩畸变,在未来的透过散射介质成像具有良好的应用前景.Fourier ptychography for high-resolution imaging has been a revolutionizing technical,since it can provide abundant information about target scene by changing illumination or pupil scanning.However,many objects are covered by dynamic scattering media,such as biological tissues and mist,that disrupts the light paths and forms the scattering wall,let alone high-resolution imaging.It is worth noting that the scatting effect caused by the scattering media will reduce the correlation of scattered light field,which makes the information aliasing difficult to extract.The situation becomes worse if the image scene is in color.Typically,the wavefront shaping,optical transmission matrix,and speckle correlation technique can successfully recover hidden targets form the scattered light field.Notably,the physical model of conventional method is limited by the difficultly in extracting target information from the strong scattering environment,especially in broadband light illumination imaging.Thus,it is limited to achieve super-resolution color imaging through scattering media by utilizing the current techniques.In this work,we present a computational polarized colorful Fourier ptychography imaging approach for super-resolution perspective in broadband dynamic scattering media.In order to address the challenge of current imaging methods that is limited by the width of the light spectrum,the polarization characteristics of the scattered-light-field are explored.After retrieving a series of sub-polarized images,which bring the information about different frequencies caused by the motion of scattering media and are processed by the common-mode rejection of polarization characteristic,our computational approach utilizes the iterative optimization algorithm to recover the scene.Notably,owning to the difference between the target scattering information and background scattering information of scattered light fields with different polarization rotation angles,we can obtain two images in which the target information and the background

关 键 词：散射 偏振 超分辨率 傅里叶叠层 计算成像 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] O436[自动化与计算机技术—计算机科学与技术]