双曲凹面折反射全景成像系统

反射镜是折反射全景成像系统的重要部件之一。针对不同场合，出现了双曲面镜、椭球面镜、抛物面镜等反射镜构成的折反射全景成像系统，但是它们成像畸变大、边缘分辨率低，为了使之适合路面勘测，提出了基于前投影模型，采用双曲凹面镜作为反射镜的方法搭建系统，分析了该系统对水平场景的成像特点，对新系统进行了仿真，并与普通双曲面镜、水平等比例镜的成像系统做了比较。结果表明，通过优化相机透视中心到反射镜几何焦点的距离，可以使得新系统在水平场景的成像上具有较小的畸变。

Concave hyperboloidal catadioptric omnidirectional imaging system

Mirror is an important part of catadioptric omnidirectional imaging system. Aiming at different application, several kinds of mirror such as hyperboloid surface, ellipsoidal surface, parabolic surface and some others were designed for the system. However, the image of these systems has large distortion and low resolution on the edge of picture. In order to make the system suitable for pavement survey, based on front projection model, concave hyperboloid mirror was designed. Imaging features of horizontal scene was analyzed for new system. The simulation results show that by optimization of distance between omnidirectional viewpoint and focus of mirror, new system attains low distorted imaging features compared with systems consist of hyperboloidal mirror or horizontal distortionless mirror.