光学学报
2022, 42(24): 2430003
Author Affiliations
Abstract
1 School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528000, P. R. China
2 Department of Physics, College of Science, Shantou University, Shantou 515063, P. R. China
3 School of Physics, Sun Yat-sen University, Guangzhou 510275, P. R. China
Visual perception of humans penetrating turbid medium is hampered by scattering. Various techniques have been prompted recently to recover optical imaging through turbid materials. Among them, speckle correlation based on deconvolution is one of the most attractive methods taking advantage of high imaging quality, robustness, ease-of-use, and ease-of-integration. By exploiting the point spread function (PSF) of the scattering system, large Field-of-View, extended Depth-of-Field, noninvasiveness and spectral resoluation are now available as successful solutions for high quality and multifunctional image reconstruction. In this paper, we review the progress of imaging through a scattering medium based on deconvolution method, including the principle, the breakthrough of the limitation of the optical memory effect, the improvement of the deconvolution algorithm and innovative applications.
Speckle correlation deconvolution scattering medium imaging through turbid media Journal of Innovative Optical Health Sciences
2019, 12(4): 1930005
激光与光电子学进展
2019, 56(14): 141103
Author Affiliations
Abstract
1 Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
A method is proposed to optimize the recording structure of the photorefractive volume grating to compensate high spatial frequency in the distorted wavefront by optical phase conjugation. Based on the coupled-wave equation, the diffraction efficiency of the recorded grating formed by the scattered beams in different recording structures is simulated. The theoretical results show that the recorded modulations with high spatial frequency can be significantly improved in the small recording angle. In the experiment, three recording structures with the recording angles of 7.5°, 30°, and 45° are chosen to verify the compensation effect. Compared with the reconstructed image in the large recording angle of 45°, the signal to noise ratio of the image recorded at 7.5° increases to 3.2 times of that at 45°.
090.7330 Volume gratings 110.0113 Imaging through turbid media 070.5040 Phase conjugation Chinese Optics Letters
2019, 17(7): 070901
Author Affiliations
Abstract
1 Research Department of Information Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Department of Electronics Science and Technology, School of Electronic & Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Traditional one-way imaging methods become invalid when a target object is completely hidden behind scattering media. In this case, it has been much more challenging, since the light wave is distorted twice. To solve this problem, we propose an imaging method, so-called round-trip imaging, based on the optical transmission matrix of the scattering medium. We show that the object can be recovered directly from the distorted output wave, where no scanning is required during the imaging process. We predict that this method might improve the imaging speed and have potential application for real-time imaging.
110.0113 Imaging through turbid media 110.1650 Coherence imaging 110.1758 Computational imaging Chinese Optics Letters
2018, 16(4): 041102
1 中国科学院西安光学精密机械研究所信息光子学研究室， 陕西 西安 710119
2 中国科学院大学， 北京 100049
偏振光学成像技术是一种新型的光学成像技术。通过对光波偏振特性的探测，可以获得其他成像技术难以获得的独特信息，有效地增加信息探测维度。近年来，偏振光学成像技术被证明了可应用于雾霾或其他散射介质中的去雾清晰成像中。随后，偏振光学成像去雾技术作为一个独立的研究分支发展起来，并取得了很多优秀的研究成果。主要介绍了偏振光学成像去雾技术的基本原理、实现途径与算法、国内外研究进展和发展现状。
成像系统 偏振成像 图像增强 散射介质成像 imaging systems polarimetric imaging image enhancement imaging through turbid media
1 北京航空航天大学仪器科学与光电工程学院， 北京 100191
2 中国科学院物理研究所北京凝聚态物理国家实验室， 北京 100190
物体和探测器中间存在的散射介质会对传统光学成像造成严重影响，计算关联成像是能够降低散射影响的有效方法之一。本文分析了光源发射路径和接收路径存在的散射介质，建立了存在散射介质的计算关联成像（CGI）模型，对比分析了不同路径段的散射介质对CGI和传统直接成像（TDI）的影响。从理论分析得出，CGI中发射路径的散射介质会引起重建图像质量的衰减，而接收路径中的散射介质几乎不会影响最终的成像结果。实验分析证实，CGI可以降低散射光对成像造成的干扰。实验结果表明，在发射路径和接收路径同时存在散射干扰时，CGI和TDI的衬噪比分别为2.98和2.72。CGI能够降低云、烟、雾或生物组织等介质的散射干扰。
成像系统 散射介质成像 计算关联成像 空间光调制器 imaging systems imaging through turbid media computational ghost imaging spatial light modulator 光学学报
2016, 36(10): 1026017
1 西北大学物理学院, 陕西 西安 710069
2 陕西科技大学理学院, 陕西 西安 710021
3 中国科学院西安光学精密机械研究所, 陕西 西安 710119
浑浊介质引起的多光散射会扭曲光波传播，使图像变得模糊。浑浊透镜成像（TLI）则可以重建这种被扭曲的图像。在该方法中，需要提取输光场的复电场（复振幅）信息，以计算浑浊介质的传输矩阵。但是CCD记录的是图像的强度信息，丢失了扭曲光场的相位信息。由于物光经过浑浊介质后变成了强度剧烈变化的散斑图像，直接进行相位解调会产生较大误差。为了消除散斑强度变化的影响，分别记录扭曲光场图像、参考光图像、干涉条纹图像和背景光图像。根据对应关系换算出干涉余弦因子，对余弦因子应用希尔伯特变换进行相位解调就可以比较准确地计算出散斑的相位。通过上述方法成功地计算出扭曲图像的复电场及浑浊介质的传输矩阵。由于对振幅的测量采用直接方法，因而对于散斑干涉条纹来说，该方法的计算结果更加准确。
成像系统 相位解调 希尔伯特变换 浑浊介质成像 imaging system phase demodulation Hilbert transform imaging through turbid media 光学学报
2015, 35(s1): s111005
