激光主动成像中的BRDF特性  

Analysis of BRDF character in active laser imaging

作　　者：孙华燕[1] 郭惠超[1] 范有臣[1] 王帅[1] 

机构地区：[1]解放军装备学院,北京101416

出　　处：《红外与激光工程》2017年第B12期18-23,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(61302183)

摘　　要：分析了常用的收发同路的BRDF函数模型,引入实折射率的函数描述介质特性进一步简化SUN模型,在传统的BRDF测试系统基础上,提出了一种基于图像分析的收发同路BRDF分析方法,采用激光主动成像实验系统照明目标样品板并成像,通过改变目标板与成像系统之间的夹角获得不同角度目标图像,进而利用图像灰度信息计算目标的BRDF值,最终得出BRDF曲线。针对不同材质进行了实验测量和仿真分析,结果表明:镜面反射目标在小角度范围内反射较强,漫反射目标较镜面反射目标有较大的可见角度范围,测试结果直接反映了成像性能,可体现不同目标材质的BRDF特性,为空间目标激光主动探测系统设计和系统成像性能分析提供数据和理论基础。The commonly used BRDF function model in the active laser imaging system was analyzed in this paper. In order to further simplify the SUN model, real refractive index function was introduced to descript the characteristics of medium. On the basis of the traditional BRDF theory, a methed based on image analysis was proposed to analyze the BRDF values of targets in the active laser imaging system. Laser active imaging system was used to illuminate the target sample plate and image, and the target image was obtained by changing the angle between the target plate and the imaging system. The BRDF values of targets were calculated with the gray values of those images, and then the BRDF curves were obtained. Experimental measurement and simulation analysis were carried out for different materials. The results indicate that the reflection of specular reflection is stronger in the range of small angle, and the reflection of diffuse reflection targets can be detected within a larger angular range. The test results directly reflect the imaging performance, which can reflect the BRDF characteristics of different target materials. The results provide data and theoretical basis for the design of the laser active detection system of the space target and the performance analysis of the system.

关 键 词：激光主动成像 BRDF 图像分析 漫反射 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]