光学学报, 2016, 36 (10): 1026017, 网络出版: 2016-10-12
不同路径下散射介质对计算关联成像的影响
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Influence of Turbid Media at Different Locations in Computational Ghost Imaging
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
摘要
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。
Abstract
In traditional direct imaging a scattering medium between the object and detection system will severely degrade the image quality. Computational correlation imaging (GI) has a unique advantage in that the effect of the light scattering can be greatly reduced. We present an analysis of computational correlation imaging and traditional direct imaging (TDI) with a turbid medium in various locations in the beam paths. It is found that a scattering medium in the illumination path will decrease the reconstructed imaging quality, while if it is only in the detection path it has almost no effect. Experimental results with a scattering medium in both the illumination and detection paths show an improved contrast-to-noise ratio of 2.98 compared with 2.72 for conventional direct imaging. These results are important for imaging objects embedded in media such as fog, smoke and cloud.
刘保磊, 杨照华, 曲少凡, 张艾昕, 吴令安. 不同路径下散射介质对计算关联成像的影响[J]. 光学学报, 2016, 36(10): 1026017. Liu Baolei, Yang Zhaohua, Qu Shaofan, Zhang Aixin, Wu Ling’an. Influence of Turbid Media at Different Locations in Computational Ghost Imaging[J]. Acta Optica Sinica, 2016, 36(10): 1026017.