Dr. Bruce Q. Tang Profile

Dr. Bruce Q. Tang

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SPIE Journal Paper | 1 January 2008

Calibration of a portable laser 3-D scanner used by a robot and its use in measurement

Jianfeng Li, Jianhua Zhu, Yongkang Guo, Xiangdi Lin, Kailiang Duan, Yishan Wang, Qing Tang

OE, Vol. 47, Issue 01, 017202, (January 2008) https://doi.org/10.1117/12.10.1117/1.2829766

KEYWORDS: Calibration, 3D scanning, Laser scanners, Cameras, Optical spheres, Robotic systems, 3D metrology, 3D image processing, Imaging systems, Scanners

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A robot scanning system consisting of a portable laser 3-D scanner and an industrial robot is demonstrated. In this system, the scanner is precalibrated by the traditional nonlinear two-step approach. In addition, by using a criterion sphere as the calibration object, a new robot tool center point (TCP) calibration approach is proposed for calibrating the relation between the precalibrated laser 3-D scanner and the robot. In this approach, two different translational motions of the robot are first made to determine the rotation part, and then at least three different rotational motions are made to determine the translation part. During the process, the extrinsic camera parameters are not recalibrated for each robot motion, so the calibration errors brought by camera calibration can be decreased. Moreover, the calibration error due to robot positioning error can be decreased by making use of the differences of different robot positions in calculations. An experiment was performed on a portable laser 3-D scanner and an ABB IRB-4400 industrial robot to test the validity of the proposed calibration approach. The experimental results show that this approach is simple and accurate compared to the conventional robot TCP calibration approach.

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