基于散斑光场偏振共模抑制性的宽谱散射成像技术  

Broadband scattering imaging technology based on commonmode rejection of polarization characteristic

作　　者：孙雪莹 刘飞 段景博[1,2] 牛耕田 邵晓鹏 Sun Xue-Ying;Liu Fei;Duan Jing-Bo;Niu Geng-Tian;Shao Xiao-Peng(School of Physics and Optoelectronic Engineering,Xidian Univeristy,Xi’an 710071,China;Xi’an Key Laboratory of Computational Imaging,Xidian University,Xi’an 710071,China;Interdisciplinary Research Center on Advanced Optics and Perception,Xidian University,Xi’an 710071,China)

机构地区：[1]西安电子科技大学物理与光电工程学院,西安710071 [2]西安电子科技大学西安市计算成像重点实验室,西安710071 [3]西安电子科技大学先进光学成像前沿交叉研究中心,西安710071

出　　处：《物理学报》2021年第22期74-83,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61975254,62005203,62075175)资助的课题.

摘　　要：针对透过随机散射介质成像中由于光源谱宽导致目标信息被淹没于背景噪声中,无法清晰复原隐藏目标信息的问题,提出基于散斑光场偏振共模抑制特性的宽谱散射成像方法.该方法深入分析散斑光场的偏振特性,利用散斑光场中目标与背景的偏振信息差异性与独立性,结合光场的偏振共模抑制特性,有效去除光源谱宽所带来的背景噪声影响,重建高对比度、高信噪比的隐藏目标图像,实现透过随机散射介质的宽谱成像.实验结果表明,该成像方法不仅能够在宽谱光源照明下实现目标与背景信息的分离,而且能够大幅提高重建图像的信噪比、对比度和结构相似度,在散射成像领域具有普适性及良好应用前景.Owing to the inhomogeneity of the refractive index inside the sample(e.g.biological tissue)or on the surface of the sample(e.g.ground glass),light will be strongly scattered when it propagates through the sample.Therefore,we can hardly obtain the information about the objects behind the scattering medium,except for only a complex speckle pattern.To date,many approaches to realize focusing and imaging through scattering medium have been put forward.The traditional method mainly utilizes ballistic photons for imaging through scattering medium.Since the ballistic light is attenuated exponentially with the increase of depth of propagation in the scattering medium,the reconstruction from the speckle formed by scattered light is more conducive to practicability such as deep biomedical imaging.Typically,the wavefront shaping,optical transmission matrix and speckle correlation techniques which can successfully recover hidden object from the speckle,are valuable in biomedical imaging field.However,both optical transmission matrix and wavefront shaping rely on the coherence of light waves.The physical model of speckle correlation imaging is limited by the similarity of the point spread function of the imaging system.Thus,it is restrictive to achieve imaging through random scattering medium with broadband light illumination by using the current techniques.In this paper,we present a broadband scattering imaging method based on common-mode rejection of polarization characteristic.In order to solve the problem that current scattering imaging methods are limited by the spectral width of the light source illumination,the polarization characteristic of the speckle field is explored in depth.We qualitatively analyze the difference in polarization information between the hidden object and the background noise in the speckle field.Notably,owing to the differences among autocorrelation functions of the speckle field intensity with different rotate angles of polarization,we can obtain two images where the object information contained

关 键 词：宽谱散射成像 偏振 差分成像 

分 类 号：O436.2[机械工程—光学工程] TP391.41[理学—光学]