基于双相机的计算机视觉坐标测量系统

Computer Vision Coordinates Measurement System with Dual Cameras

为了解决单相机坐标测量模型中轴向定位重复性差的问题,研究正交双相机视觉坐标测量系统;系统由一支特制光靶标、两台正交放置的CCD摄像机和一台电脑组成。在单相机测量模型的基础上引入冗余算法,使得两个正交单相机系统相互补偿对方轴向测量误差,从而实现高精度的空间三维坐标测量;实验采用最简的共线三点测头模式搭建测试装置,在测量距离1500mm处各个方向分辨率优于0.2mm,与坐标测量机移动对比测量精度达到±0.15mm。

A dual-camera vision 3D coordinate measuring system using a probe is proposed to solve the problem of the low measuring repeatability about similar system with one camera. It mainly consists of a specially designed optical bar, two orthogonally placed CCD cameras and a computer. In the dissertation, the dual-camera model is established based on the principle of redundancy and the single camera system model. And the analytical equations of the measured point＇s coordinates are derived, A test device is built using the easiest three-point model light bar, The experimental result shows that the system with linear points and dual cameras has achieved a measuring stability precision of 0.2 mm and measuring precision of ±0.15 mm in the direction of every axis for a distance of 1 500 mm away from dual-camera system.