光杠杆补充尺度因子的大视场扫描式摄像测量方法

Large field of view scanning photogrammetry method with optical lever supplementing scale factor

摄像测量方法因具有全场、非接触和观测尺度易调节等优势,在材料/结构运动/变形测量方面的应用越来越广泛,但是该方法的观测范围和测量分辨率之间存在矛盾,导致其在大视场测量应用下出现了观测精度不足的问题。本文发展了一种基于光杠杆补充尺度因子的扫描式摄像测量方法,利用光杠杆放大扫描相机的运动参数,将光斑几何位置改变作为补充方程,确定扫描相机每一时刻下的精确位姿信息,再通过多目立体视觉原理对被测目标进行三维重建。结果表明,该方法能够准确求解扫描相机三维位姿参数,在大视场条件下获得比双目测量更高的观测精度。

The photogrammetry method has the advantages of full field, non-contact and easy adjustment of the observation scale, so it is more and more widely used in material/structure movement/deformation measurements. However, the contradiction between the observation range and the measurement resolution of this method leads to the problem of insufficient observation accuracy in the large field of view measurement applications. In this work, a scanning photogrammetry method is developed based on the optical lever supplementary scale factor. The optical lever is used to amplify the motion parameters of the scanning camera, and the geometric position change of the spot is used as a supplementary equation to determine the precise pose information of the scanning camera at each moment. Then the principle of multi-vision is used to reconstruct the measured target in three dimensions. The results show that the method can accurately solve the three-dimensional pose parameters of the scanning camera, and obtain higher observation accuracy than that in binocular measurements under the condition of large field of view.