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一种新的线结构光标定方法

Calibration Method for Line-Structured Light

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摘要

针对现有的测量系统中线结构光标定方法存在的局限性,设计了一种新的标定方法。该方法通过避免光条与靶标参照物上的棋盘相交,提高了特征点的提取精度,并通过增加用于拟合光平面的特征点数量来提高标定的精度。连接光条中心任意特征点与相机中心以形成一条直线;联立直线方程与靶标参照物平面方程,求解特征点在相机坐标系下的坐标,继而求解2条及以上的光条中心点在相机坐标系下的坐标;基于最小二乘法,利用所有光条中心特征点计算光平面在相机坐标系下的方程。实验结果表明,该方法的准确性和鲁棒性均优于现有的标定方法。

Abstract

A new calibration method is proposed to address the limitations of the line-structured light calibration method in the existing measurement systems. The proposed method improves the extraction accuracy of feature points by avoiding intersection between the light stripe and chessboard on the target reference,and improves the calibration accuracy by increasing the number of feature points for light plane fitting. The coordinates of feature points in the camera coordinate system are computed by combining the equation of rays which is formed by the connection of arbitrary feature points at the center of the light strip and the camera center and the plane equation of the target reference, then the coordinates of the center points of two and more strips in the camera coordinate system are solved. Finally, based on the least square method, the equation of the light plane in the camera coordinate system is obtained based on coordinates of all center feature points of the stripes. Experimental results show that the accuracy and robustness of the proposed method are superior to those of existing calibration methods.

Newport宣传-MKS新实验室计划
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DOI:10.3788/LOP56.221101

所属栏目:成像系统

基金项目:国家自然科学基金;

收稿日期:2019-03-14

修改稿日期:2019-05-13

网络出版日期:2019-11-01

作者单位    点击查看

张瑞峰:天津大学微电子学院, 天津, 300072
舒子芸:天津大学微电子学院, 天津, 300072
南刚雷:天津大学微电子学院, 天津, 300072

联系人作者:舒子芸(szy826@tju.edu.cn)

备注:国家自然科学基金;

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引用该论文

Zhang Ruifeng,Shu Ziyun,Nan Ganglei. Calibration Method for Line-Structured Light[J]. Laser & Optoelectronics Progress, 2019, 56(22): 221101

张瑞峰,舒子芸,南刚雷. 一种新的线结构光标定方法[J]. 激光与光电子学进展, 2019, 56(22): 221101

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