基于传递像机的移动摄像测量方法

Mobile Videometrics Method Based on Relay Camera

针对大型结构表面积较大而像机视野有限的问题,提出了一种基于传递像机的移动摄像测量方法,该方法可对大型结构进行全局扫描测量。利用固定连接于移动平台的传递像机对基准标识点进行图像采集,采用像机参数标定方法对传递像机的外参数进行计算,得到相邻时刻移动平台坐标的相对转换关系。测量像机在移动平台的驱动下围绕结构表面采集特征点,利用运动平台坐标的转换关系计算得到测量像机的实时外参数。建立等效双目交会共线方程,并对特征点位置进行计算,在初始位置完成参数标定后,即可实现自动测量。实验结果表明,所提出的移动摄像测量方法的测量精度可达2.012mm,且自动化程度较高,可应用于大型结构的在线监测。

Aiming at the problem that the large-scale structure＇ s surface is large and the vision of camera is limited, a mobile videometrics method based on relay camera is proposed, and the global scanning measurement is carried out for large-scale structures. Reference mark points are acquired by relay camera fixed on the mobile platform. Extrinsic parameters of relay camera are calculated by the camera parameter calibration method, and the relative conversion relationship among mobile platform coordinates at adjoining times is obtained. A measurement camera goes around structure surface and acquires feature points, which is drived by mobile platform. After that, the real- time extrinsic parameters of the measurement camera can be obtained by the conversion relationship among mobile platform coordinates, and the equivalent binocular intersection collinear equation is established to calculate the positions of feature points. The automatic measurement is realized after completing parameter calibration at initial position. Experiments show that the measurement precision of the proposed method is 2. 012 mm, and it is suitable for online monitoring large-scale structure with high degree of automation.