Sub-regional camera calibration based on moving light target

LIU Shu-gui; JIANG Zhen-zhu; DONG Ying-hua; ZHANG Hong-ling

doi:10.3788/OPE.20142202.0259

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Sub-regional camera calibration based on moving light target

Modern Applied Optics | 更新时间：2020-08-13

- Sub-regional camera calibration based on moving light target
- Optics and Precision Engineering Vol. 22, Issue 2, Pages: 259-265(2014)
- 作者机构：
  
  天津大学精密测试技术及仪器国家重点实验室天津,300072
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20142202.0259
  CLC： TN386.5;TB853.1
- Received：27 March 2013，
  
  Published：20 February 2014
- 稿件说明：
移动端阅览
刘书桂,姜珍珠,董英华等. 采用移动光靶标的分区域相机标定[J]. 光学精密工程, 2014,22(2): 259-265

LIU Shu-gui, JIANG Zhen-zhu, DONG Ying-hua etc. Sub-regional camera calibration based on moving light target[J]. Editorial Office of Optics and Precision Engineering, 2014,22(2): 259-265
刘书桂,姜珍珠,董英华等. 采用移动光靶标的分区域相机标定[J]. 光学精密工程, 2014,22(2): 259-265 DOI： 10.3788/OPE.20142202.0259.

LIU Shu-gui, JIANG Zhen-zhu, DONG Ying-hua etc. Sub-regional camera calibration based on moving light target[J]. Editorial Office of Optics and Precision Engineering, 2014,22(2): 259-265 DOI： 10.3788/OPE.20142202.0259.

摘要

针对工业视觉测量中的摄像机标定精度及效率低的问题

提出一种高精度CCD相机分区域标定方法。该方法首先利用三坐标测量机(CMM)带动圆形发光二极管(LED)光靶标按梯形台状做精确空间移动

结合最小二乘椭圆拟合算法求解光靶标的像面位置

并与CMM三维坐标形成精确的空间标定点集。同时

将像平面按圆环形对称结构分割成

个区域

并结合改进的Tsai算法分别对每个子区域进行相机参数的标定。标定实验结果表明:经过分区域标定

相机采集点的总误差比单区域标定法降低了17%(

=8)

单点平均误差降低了20%左右。算法可实现自动精确标定点采集

操作过程简单

基本满足中等精度的工业测量要求。所提出的相机标定法可应用于工业视觉测量

特别是大工件测量领域。

Abstract

A reliable sub-regional calibration method for CCD cameras was proposed to improve the accuracy and efficiency of industrial vision measurement. With the proposed method

a round light target was moved with the Coordinate Measuring Machine (CMM) according to a trapezoidal shape. The images of light target were processed with least square ellipse fitting algorithm to obtain the center positions. By 3D coordinates of CMM

a set of accurate calibration data were obtained. Furthermore

the image plane was separated into several sections according to the circle symmetrical structure and camera parameters in different regions were calculated with the sub-regional theory and improved Tsai method. Comparing with the sub-regional calibration method to single calibration one

the actual calibration experiments show that the total error is decreased by 17% when the image is separated 8 regions and the average error of single point is decreased about 20% . Experiments demonstrate that the data collection process is automatic and simple

and the camera calibration accuracy meets the medium precision of industrial measurement.It indicates that the method proposed is suitable for the industrial vision measurement

especially for the larger work piece measurement.

关键词

Keywords

references

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