基于三维重建理论的目标光谱散射特性研究  

Research on the Spectral Scattering of Target Based on Three-Dimensional Reconstruction Theory

作　　者：杨玉峰[1] 吴振森[1] 曹运华[1] 

机构地区：[1]西安电子科技大学理学院,陕西西安710071

出　　处：《光学学报》2012年第9期288-294,共7页Acta Optica Sinica

基　　金：国家自然科学基金(60771038;60971065)资助课题

摘　　要：根据三维重建理论,基于目标的多角度视图,重建了目标表面的三维点云。利用德洛奈三角剖分法结合可见性原理,得到了目标的曲面和曲面面元的法线方向。根据粗糙面散射理论和目标表面的双向反射分布函数(BRDF),结合大气传输软件Modtran计算的某时间、地点的背景光谱辐射亮度,数值分析了目标光谱散射亮度分布特性。以覆盖车衣的汽车为例,重建的三维几何模型误差为4.11%,数值计算了目标在三个波段的光谱散射亮度分布。上述方法可以进一步用于卫星和其他空间目标的光谱辐射、散射特性研究。According to three-dimensional （3D） reconstruction theory, based on multi-angle images of the target, 3D points cloud of the target surface is reconstructed. With the method of Delaunay triangulation and the principle of ＂visibility＂, the target surface and the normal vector of surface elements are gained. By the rough surface scattering theory and the target sample bidirectional reflectance distribution function （BRDF）, associated with the spectral radiance of the background at some time and place calculated by Modtran, the spectral scattering radiance distribution of the target is obtained by numerical analysis method. Taking a car covered with car sewing as an example, the error of the reconstructed geometric 3D model is 4.11%, and the spectral scattering radiance distributions of the target in three bands are obtained by numerical calculation. The method above can be applied to the research on spectral radiation and scattering of satellites and other spatial targets.

关 键 词：散射 双向反射分布函数 三维重建 三维模型 德洛奈三角剖分 

分 类 号：O436.2[机械工程—光学工程]