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Sensors 2016, 16(2), 239; doi:10.3390/s16020239

A Rapid Coordinate Transformation Method Applied in Industrial Robot Calibration Based on Characteristic Line Coincidence

State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
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Author to whom correspondence should be addressed.
Academic Editors: Xin Zhao and Yajing Shen
Received: 22 December 2015 / Revised: 5 February 2016 / Accepted: 14 February 2016 / Published: 18 February 2016
(This article belongs to the Special Issue Sensors for Robots)
View Full-Text   |   Download PDF [3766 KB, uploaded 19 February 2016]   |  

Abstract

Coordinate transformation plays an indispensable role in industrial measurements, including photogrammetry, geodesy, laser 3-D measurement and robotics. The widely applied methods of coordinate transformation are generally based on solving the equations of point clouds. Despite the high accuracy, this might result in no solution due to the use of ill conditioned matrices. In this paper, a novel coordinate transformation method is proposed, not based on the equation solution but based on the geometric transformation. We construct characteristic lines to represent the coordinate systems. According to the space geometry relation, the characteristic line scan is made to coincide by a series of rotations and translations. The transformation matrix can be obtained using matrix transformation theory. Experiments are designed to compare the proposed method with other methods. The results show that the proposed method has the same high accuracy, but the operation is more convenient and flexible. A multi-sensor combined measurement system is also presented to improve the position accuracy of a robot with the calibration of the robot kinematic parameters. Experimental verification shows that the position accuracy of robot manipulator is improved by 45.8% with the proposed method and robot calibration. View Full-Text
Keywords: coordinate transformation; robot calibration; photogrammetric system; multi-sensor measurement system coordinate transformation; robot calibration; photogrammetric system; multi-sensor measurement system
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Liu, B.; Zhang, F.; Qu, X.; Shi, X. A Rapid Coordinate Transformation Method Applied in Industrial Robot Calibration Based on Characteristic Line Coincidence. Sensors 2016, 16, 239.

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