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激光旋转扫描测量系统中转轴标定及多视拼合

Calibration of the Axis of the Turntable in 4-Axis Laser Measuring System and Registration of Multi-View

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摘要

由于激光扫描一次只能测量给定视角可见的物体表面,若测量物体全方位的形状,必须通过旋转,从多个视角测量物体,并将多视数据拼合于同一坐标系。精确标定转台的中心轴线是旋转测量和多视拼合的关键。提出了一种标定转台中心轴线的新方法,该方法将一个标定球固定于转台上,通过旋转,测量不同位置的标定球,计算不同位置的球心及其所在平面的法矢,再利用几何变换计算球心所在圆的圆心,从而精确标定出转轴的方位,实现了多视测量数据在线自动拼合,提高了数据拼合的精度。对于精度为50 μm的测量机,在半径80 mm的旋转范围内,拼合误差约为70 μm。与以前的方法相比,设计的转轴标定方法简单、高效,在其他安装转台的测量系统中同样适用。

Abstract

Since laser scanner only samples the surface of an object which is visible from a given viewpoint, in order to scan the entire object, it is necessary that the multiple views around the object are captured and aligned in a common coordinate system. Locating the center axis of a turntable precisely is essential for measuring the object which turned on the axis and the registration of multi-view. A new method is proposed to calibrate the axis of the turntable. Firstly, a ball as the calibration normal is mounted on the turntable, then measuring the surface of the calibration ball and calculating its center at different rotational angles. These centers define a circle and a plane. The normal of the plane and the center of the circle counted by geometric transform decide the orientation of the axis of the turntable. The multiple views turn around the axis and can be integrated automatically. The error of registration is about 70 μm within 80 mm rotational radius on the measuring platform which accuracy is 50 μm. Compared with the previous methods, the new method is simple and efficient and can be used in other measuring system with a turntable.

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中图分类号:TN247

所属栏目:测量与计量

收稿日期:2004-03-29

修改稿日期:2004-06-14

网络出版日期:--

作者单位    点击查看

徐永安:北京航空航天大学计算机学院,北京 100083
杨钦:北京航空航天大学计算机学院,北京 100083
怀进鹏:北京航空航天大学计算机学院,北京 100083

联系人作者:徐永安(xuyongan@hotmail.com)

备注:徐永安(1965—),男,江苏兴化人,高级工程师,博士后,主要从事计算机图形学、计算机辅助设计、计算机图像处理与视觉测量、逆向工程研究。

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引用该论文

徐永安,杨钦,怀进鹏. Calibration of the Axis of the Turntable in 4-Axis Laser Measuring System and Registration of Multi-View[J]. Chinese Journal of Lasers, 2005, 32(5): 659-662

徐永安,杨钦,怀进鹏. 激光旋转扫描测量系统中转轴标定及多视拼合[J]. 中国激光, 2005, 32(5): 659-662

被引情况

【1】吴庆阳,李景镇,苏显渝,惠彬. 线结构光三维测量系统中旋转轴的标定方法. 中国激光, 2008, 35(8): 1224-1227

【2】陈新禹,马孜,陈天飞,李鹏. 线结构光视觉测量系统运动轴线的简易标定方法. 中国激光, 2012, 39(11): 1108014--1

【3】魏新国,刘涛,刘震. 基于平面圆靶标的三维数据拼接. 光学学报, 2013, 33(2): 215002--1

【4】王小娟,刘丙才,鞠鑫. 激光光刀平面修正技术及实验研究. 应用激光, 2018, 38(4): 662-667

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