光学拼接成像系统  

Optical butting system

作　　者：雷华[1] 徐之海[1] 冯华君[1] 李奇[1] 

机构地区：[1]浙江大学现代光学仪器国家重点实验室,杭州310027

出　　处：《仪器仪表学报》2010年第6期1213-1217,共5页Chinese Journal of Scientific Instrument

基　　金：973计划(2009CB724006);国家自然科学基金(60977010);现代光学仪器国家重点实验室自主研究项目资助

摘　　要：在许多应用场合成像系统的视场往往取决于图像传感器的分辨率,比如在遥感成像系统中。采用多片图像传感器进行机械拼接可以提高图像传感器的分辨率从而扩大成像系统的视场,然而图像传感器的拼接面临技术难成本高的缺点。设计了一种能够实现扩大视场的光学拼接成像系统。该系统的基本思路就是将像面分割成若干部分,这些子像面的位置彼此之间是分离的,因此成像器件安放的位置也不会冲突。该系统采用了金字塔式的分光棱镜来实现分割像面的目的,分光棱镜置于传统的成像系统靠近像面的位置。分光棱镜会造成中心视场有一定的渐晕现象,为了消除渐晕并保证图像具有高的信噪比,4个图像传感器所接收的子图像彼此之间具有一定的重叠,可以相互补偿。4个子图像经过软件拼接可以得到完整的无缝的大图像,与传统的成像系统相比,该系统视场扩大率约小于2×2倍。The FOV（field of view） of an imaging system is limited by the resolution of imaging sensors in many applications,for example,in remote imaging systems.One of the solutions is to butt several imaging sensors.However,high cost and special technology are required for this solution.To extend the FOV,an optical butting system is proposed.The basic idea of this system is to split the optical image into several parts so that they can be detected by different sensors without conflict in their locating spaces.To do so,a pyramid prism is used in conventional imaging system.The prism divides the optical image into four parts.In order to eliminate the vignetting distortion caused by the prism and keep high SNR（signal to noise ratio）,the four sensors receiving the four image parts are placed with a little overlapping so that they can compensate each other.A high quality image can be obtained by stitching the four image parts.Compared with conventional imaging systems,the optical butting system can improve the resolution by a factor about 2×2.

关 键 词：成像系统 光学拼接 渐晕补偿 分光棱镜 

分 类 号：O439[机械工程—光学工程]