利用双激光器标定激光测头的光平面

提出了一种可以在现场对激光扫描测头进行光平面标定的方法。依据摄像机标定的模型, 建立了光平面的数学模型, 设计了用两条不平行的激光光条交替出现在标定棋盘上的方法, 用来获取更加精确的特征点。在摄像机视场范围内, 多次变换棋盘标靶位置, 得到更多的特征点。坐标变换后对这些特征点进行平面拟合, 得到激光平面在摄像机坐标系下的方程。试验结果表明: 光平面标定的平均误差为0.028 mm。在三坐标测量机上验证其测距精度, 结果表明激光扫描测头测距的最大误差为0.031 mm, 说明本文方法具有较高的标定精度, 且适合现场标定。

Abstract

A field calibration for laser scanning probe is put forward. Based on the model of camera calibration, the mathematical model of the laser plane is built. In order to get the more accuracy feature points, a new method using two alternate laser stripes which are not parallel to project on the chessboard is designed. The target is put in several different positions within the field of the camera vision aiming to get more feature points. All these feature points are fitted to an ideal plane after coordinate transformation. And the equation of the laser plane is obtained in camera coordinate. Experimental results indicate that the mean calibration error is less than 0.028mm. Using CMM to test the distance precision of the laser plane, the results show that the max distance error is 0.031mm. Experimental results indicate that the calibration technique has high accuracy and this method is suitable for field calibration.

参考文献

[1] 郭辉. 关节臂式柔性三坐标测量系统关键技术的研究 [D]. 天津: 天津大学, 2005.

[2] Seokbae S, Hyunpung P, Kuanh H L. Automated Laser Scanning System for Reverse Engineering and Inspection [J]. International Journal of Machine Tools & Manufacture(S0890-6955), 2002, 42(8): 889-897.

[3] Nick Van Gestel, Steven Cuypers, Philip Bleys. A Performance Evaluation Test for Laser Line Scanner on CMMS [J]. Optical and Lasers in Engineering(S0143-8166), 2009, 47: 336-342.

[4] 李凌旻, 王振兴, 习俊通. 无位姿约束的线激光视觉传感器参数标定 [J]. 光电工程, 2013, 40(6): 63-70.

LI Lingmin, WANG Zhenxing, XI Juntong. Free Pose Calibration of a Line Laser Monocular Vision Sensor [J]. Opto-Electronic Engineering, 2013, 40(6): 63-70.

[5] Zhou F, Zhang G. Complete Calibration of a Structured-light Strip Vision Sensor through Planar of Unknown Orientations [J]. Image and Vision Computing(S0262-8856), 2005, 23(1): 59-67.

[6] Wu B, Xue T, Zhang T, et al. A Novel Method for Round Steel Measurement with a Multi-line Structured Light Vision Sensor [J]. Measurement Science and Technology(S0957-0233), 2010, 21(2): 025204-025209.

[7] 孙长库. 激光测量技术 [M]. 天津: 天津大学出版社, 2008: 155-156.

[8] Dewar R. Self-generated Targets for Spatial Calibration of Structured-light Optical Sectioning Sensors with Respect to An External Coordinate System [C]// Proceedings of Robots and Vision’88 Conference, Detroit, Michigan, June 6-9, 1988: 5-13.

[9] 段发阶, 刘凤梅, 叶声华. 一种新型线结构光传感器结构参数标定方法 [J]. 仪器仪表学报, 2000, 21(1): 108-110.

DUAN Fajie, LIU Fengmei, YE Shenghua. A New Accurate Method for the Calibration of Line Structured Light Sensor [J]. Chinese Journal of Scientific Instrument, 2000, 21(1): 108-110.

[10] 吴庆华, 何涛, 史铁林. 一种基于平面标靶的线结构光视觉传感器标定方法 [J]. 光电子·激光, 2013, 24(2): 297-301.

WU Qinghua, HE Tao, SHI Tielin. A Calibration Method for Line Structured-light Vision Sensor Based on a Plane Target [J]. Journal of Optoelectronics · Laser, 2013, 24(2): 297-301.

[11] 邾继贵, 李艳军, 叶声华. 基于共面标定参照物的线结构光传感器快速标定方法 [J]. 中国机械工程, 2006, 17(2): 183-186.

ZHU Jigui, LI Yanjun, YE Shenghua. A Speedy Method for The Calibration of Line Structured Light Sensor Based on Coplanar Reference Target [J]. China Mechanical Engineering, 2006, 17(2): 183-186.

[12] 许丽, 张之江. 基于共面靶标的结构光标定方法 [J]. 光电子·激光, 2009, 20(8): 1063-1069.

XU Li, ZHANG Zhijiang. Calibration in Structured Light System Using Coplanar Target [J]. Journal of Optoelectronics·Laser, 2009, 20(8): 1063-1069.

[13] ZHANG Zhengyou. A Flexible New Technique for Camera Calibration [J]. IEEE Transaction on Pattern Analysis and Machine Intelligence(S0162-8828), 2000, 22(11): 1330-1334.

[14] 刘震, 张广军. 一种高精度线结构光传感器视觉传感器现场标定方 [J]. 光学学报, 2009, 29(11): 3124-3128.

LIU Zhen, ZHANG Guangjun. An Accurate Calibration Method for Line Structured Vision Sensor [J]. Acta Optica Sinica, 2009, 29(11): 3124-3128.

[15] 崔希君, 杨川, 刘保华, 等. 线性结构光心的自适应迭代提取法 [J]. 西安交通大学学报, 2007, 41(1): 73-76.

CUI Xijun, YANG Chuan, LIU Baohua, et al. Self-adaptive Iterative Method of Extracting Center of Linear-structured Light Stripe [J]. Journal of Xi’an Jiaotong University, 2007, 41(1): 73-76.

[16] 周富强, 张广军. 用于结构光视觉传感器标定的特征点获取方法 [J]. 仪器仪表学报, 2005, 26(4): 347-351.

ZHOU Fuqiang, ZHANG Guangjun. Constructing Method of Feature Points Used for Calibrating Structured Light Vision Sensor [J]. Chinese Journal of Scientific Instrument, 2005, 26(4): 347-351.

周爱国, 葛卫梁, 陆敏恂, 吕刚, 周飞. 利用双激光器标定激光测头的光平面[J]. 光电工程, 2015, 42(3): 44. ZHOU Aiguo, GE Weiliang, LU Minxun, Lü Gang, ZHOU Fei. Calibrating Laser Plane of Scanning Probe with Two Lasers[J]. Opto-Electronic Engineering, 2015, 42(3): 44.

利用双激光器标定激光测头的光平面

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