关键词: 白车身, 激光扫描, 视觉测量, 图像分割, 点云分割, 整体最小二乘

Abstract:

The position parameters of an assembly features of Body-in-White（BIW） can be calculated by stripe laser scanning and laser curve image processing. For the complex features such as studs and threaded holes, an optimal threshold iterative method based on histogram is proposed to automatically identify theeffective laser curve in the imageand obtain the scattered point cloud related to the feature to be tested. Aiming at different scattered point clouds, suitable point cloud segmentation methods and calculation methods for related parameters are proposed. Experiments show that the repeatability and absolute accuracy of the corresponding method meet the requirements of engineering applications.

Key words: Body-in-White（BIW）, laser scanning, vision measurement, image segmentation, point cloud segmentation, Total Least Squares（TLS）