Tyo J S, Rowe M P, Pugh E N, Engheta N
Appl Opt. 1996 Apr 10;35(11):1855-70. doi: 10.1364/AO.35.001855.
Polarization-difference imaging (PDI) was recently presented by us as a method of imaging through scattering media [Opt. Lett. 20, 608 (1995)]. Here, PDI is compared with conventional, polarizationblind imaging systems under a variety of conditions not previously studied. Through visual and numerical comparison of polarization-difference and polarization-sum images of metallic targets suspended in scattering media, target features initially visible in both types of images are shown to disappear in polarization-sum images as the scatterer concentration is increased, whereas these features remain visible in polarization-difference images. Target features producing an observed degree of linear polarization of less than 1% are visible in polarization-difference images. The ability of PDI to suppress partially polarized background variations selectively is demonstrated, and discrimination of target features on the basis of polarization information is discussed. Our results show that, when compared with conventional imaging, PDI yields a factor of 2-3 increase in the distance at which certain target features can be detected.
我们最近提出了偏振差成像（PDI）作为一种透过散射介质成像的方法[《光学快报》20, 608 (1995)]。在此，将PDI与传统的、不区分偏振的成像系统在多种此前未研究过的条件下进行比较。通过对悬浮在散射介质中的金属目标的偏振差图像和偏振和图像进行视觉和数值比较，结果表明，随着散射体浓度增加，最初在两种类型图像中都可见的目标特征在偏振和图像中消失，而这些特征在偏振差图像中仍然可见。在偏振差图像中可以看到产生小于1%的观测线性偏振度的目标特征。展示了PDI选择性抑制部分偏振背景变化的能力，并讨论了基于偏振信息对目标特征的辨别。我们的结果表明，与传统成像相比，PDI在可检测到某些目标特征的距离上提高了2至3倍。
