自由曲面视觉测量三维数据拼接方法研究

In this paper, a 3D data registration method using mark points was proposed for vision measurement. Mark points were attached to the measured objects, and the images of mark points were captured by a digital camera from different viewpoints. Then the coordinates were determined, forming the global measurement control points. The 3D scanner was placed in different positions to get the local cloud points and the local coordinates of the mark points, which formed the local measurement control points. The transformation from the local to the global coordinate frame was computed using at least three non-collinear mark points, thus the 3D data registration was accomplished. The proposed method is convenient and applicable in field measurements. Experimental results shows that the registration error in x, y, z axis are 0.17mm，0.11mm，0.10mm respectively.