双反射面互补结构的折反射全向成像系统设计  

Design Analysis of a Complementary Double-Mirror Catadioptric Omnidirectional Imaging System

作　　者：陈立栋[1] 王炜[1] 张茂军[1] 陈旺[1] 

机构地区：[1]国防科学技术大学信息系统与管理学院,湖南长沙410073

出　　处：《光学学报》2010年第12期3487-3494,共8页Acta Optica Sinica

基　　金：国家863计划(2009AA01Z328);国家自然科学基金(60872150;60773023;60705013)资助课题

摘　　要：为解决折反射全向成像空间分辨率低、分辨率分布不均匀的问题,提出一种双反射面互补结构的折反射全向成像系统。通过使空间点在全向图的内外环互补二次成像,有效改善全向成像的分辨率分布不均匀问题,并通过限制成像系统的垂直视域以得到较高的空间采样分辨率。详细阐述了两个反射镜面的面型参数和系统尺寸的计算方法,并通过光线追踪推导出全向图与柱面全景图之间的坐标映射关系。实验结果表明,该全向成像系统的分辨率分布明显更为均匀,全向图内外环之间存在很强的互补性。此外,互补二次成像的亚像素采样偏移为下一步的超分辨率柱面全景空间重建奠定了重要基础。To solve the problems of low and non-uniform resolution in catadioptric omnidirectional imaging,a novel omnidirectional sensor of complementary imaging structure is designed,by using two reflecting mirrors.Each spatial object has two imaging positions,respectively in the inner and the outer ring of captured omnidirectional images.The uniformity of resolution distribution is obviously improved due to complementary double imaging,and higher spatial resolution is achieved by limiting the vertical field of vision in a narrow range for some specific applications,such as military remote surveillance.Computational methods of the shape parameters and sizes of two mirrors are described in detail,and the mapping relations between omnidirectional image plane and cylindrical panoramic space are accurately derived based on ray tracing.Experimental results show that remarkable complementarities exist between the inner and outer ring of omnidirectional images,and detailed analysis of resolution distribution is presented.Moreover,sub-pixel sampling displacement between two image positions provides essential preconditions and foundations for further research on super-resolution reconstruction of cylindrical panoramic space.

关 键 词：光学设计 折反射全向成像 分辨率分布 双反射面 互补二次成像 柱面全景空间 

分 类 号：TN256[电子电信—物理电子学] TP391[自动化与计算机技术—计算机应用技术]