基于激光距离选通成像的非视域成像应用

Non-line-of-sight imaging based on laser range-gated imaging technology

非视域成像是国外近几年出现的一种新的成像模式,能够绕过拐角对难以直接观察的场景进行成像。介绍了基于激光距离选通成像技术的非视域成像模式,给出了国外的几个典型非视域成像实验及其结果。搭建了基于532 nm激光器和ICCD探测器的距离选通成像系统,以窗户玻璃和墙面瓷砖作为中介反射面,分别获得了50 m和20 m处目标的非视域图像。实验结果表明,非视域成像的效果与中介反射面的反射特性有关,许多具有一定镜面反射特性的建筑材料均可作为中介反射面,用于非视域成像;非视域成像模式在城市巷战、公安侦察以及抗灾救援等领域展现出潜在的应用前景,是一种具有发展前景的新型光电成像模式。

Non-line-of-sight imaging is a new kind of imaging mode recently proposed by forign countries, which can look around comers and beyond the line of sight. In this paper, the concept of non-line-of-sight imaging mode based on laser range-gated imaging technology was illustrated, some foreign typical experiments and experiment results of it were also presented. Then, the range-gated imaging set-up in the laboratory, employing 532 nm Nd：YAG pulsed laser and intensified charge coupled device （ICCD）, was utilized to get non-line-of-sight images through the reflection of glass window and ceramic tile wall. Experiments were carried out with a distance of 50 m and 20 m respectively. Analysis of the resultant images shows that the feasibility of non-line-of-sight imaging is related to the reflection properties of the reflection media, that is, media with specular reflection to a certain threshold can be used in non-line-of-sight imaging. Finally, non-line-of-sight imaging technology will be a new promising optical imaging mode, showing a potential application in urban street fighting, public security reconnaissance, disaster relief, and so on.