Method for Measuring Clearance of Automobile Body Panel with Double Structured Light System

2nd International Conference on Manufacturing Technologies

Liu, Ruochen^1 ; Guo, Lei^1 ; Yin, Shibin^1 ; Liu, Haqing^1 ; Wang, Qingbao^1

School of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing

210094, China^1

关键词: Automobile body panel;    Calculation models;    Extrinsic parameter;    Line structured lights;    Parameter calibration;    Real time measurements;    Structured light systems;    Three-dimensional scanning;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/398/1/012015/pdf
DOI  :  10.1088/1757-899X/398/1/012015

来源: IOP

【 摘 要 】

According to the changes of the autobody measuring clearance often face the shooting angle problem caused by internal decline caused by the lack of data acquisition accuracy, a high precision and robust measurement of binocular gap line structured light and the system parameter calibration method of system integration. First the mathematical measurement model of the system is established according to the Zhang Zhengyou camera calibration model to calculate the camera parameters, the extrinsic parameters of the camera calibration of the light plane, while the introduction of auxiliary line structured light laser by solving the intersection of two camera coordinate system, finally gives the calculation model of the door gap and combined with the calibration data for the gap size. Compared with a three- dimensional scanning measuring device, the system can measure only two images at the same time. The experimental results show that when the shooting angle is less than 45 degrees at the working distance of 400mm and 50∗50 field of view, the accuracy reaches 0.08mm, which meets the needs of fast and real-time measurement gap.