Vision-based calibration of a Hexa parallel robot
Author:
Dehghani Mehdi,Ahmadi Mahdi,Khayatian Alireza,Eghtesad Mohamad,Yazdi Mehran
Abstract
Purpose
– The purpose of this paper is to present a vision-based method for the kinematic calibration of a six-degrees-of-freedom parallel robot named Hexa using only one Universal Serial Bus (USB) camera and a chess pattern installed on the robot's mobile platform. Such an approach avoids using any internal sensors or complex three-dimensional measurement systems to obtain the pose (position/orientation) of the robot's end-effector or the joint coordinates.
Design/methodology/approach
– The setup of the proposed method is very simple; only one USB camera connected to a laptop computer is needed and no contact with the robot is necessary during the calibration procedure. For camera modeling, a pinhole model is used; it is then modified by considering some distortion coefficients. Intrinsic and extrinsic parameters and the distortion coefficients are found by an offline minimization algorithm. The chess pattern makes image corner detection very straightforward; this detection leads to finding the camera and then the kinematic parameters. To carry out the calibration procedure, several trajectories are run (the results of two of them are presented here) and sufficient specifications of the poses (positions/orientations) are calculated to find the kinematic parameters of the robot. Experimental results obtained when applying the calibration procedure on a Hexa parallel robot show that vision-based kinematic calibration yields enhanced and efficient positioning accuracy. After successful calibration and addition of an appropriate control scheme, the robot has been considered as a color-painting prototype robot to serve in relevant industries.
Findings
– Experimental results obtained when applying the calibration procedure on a Hexa parallel robot show that vision-based kinematic calibration yields enhanced and efficient positioning accuracy.
Originality/value
– The enhanced results show the advantages of this method in comparison with the previous calibration methods.
Subject
Industrial and Manufacturing Engineering,Computer Science Applications,Control and Systems Engineering
Reference52 articles.
1. Ahmadi, M.
(2009), “Design, fabrication and robust-adaptive control of a hexa parallel robot”, MSc. thesis, Dept of Mechanical Engineering, Shiraz University, Shiraz, Fars. 2. Ahmadi, M.
,
Dehghani, M.
,
Eghtesad, M.
and
Khayatian, A.
(2008), “Inverse dynamics of hexa parallel robot using lagrangian dynamics formulation”, in Proceedings of IEEE International Conference on Intelligent Engineering Systems, INES 2008, Miami, FL, pp. 145-149. 3. Andreff, N.
,
Renaud, P.
,
Martinet, P.
and
Pierrots, F.
(2004), “Vision-based kinematic calibration of a H4 parallel mechanism”, Industrial Robot-an International Journal, United Kingdom, Vol. 31 No. 3, pp. 273-283. 4. Bai, S.P.
and
Teo, M.Y.
(2002), “Kinematic calibration and pose measurement of a medical parallel manipulator”, in Proceedings of 7th IEEE International Conference on Control, Automation, Robotics and Vision, ICARCV 2002, Singapore, Vol. 1, pp. 419-424. 5. Besnard, S.
and
Khalil, W.
(1999), “Calibration of parallel robots using two inclinometers”, in Proceedings of IEEE International Conference on Robotics and Automation, Detroit, MI, Vol. 3, pp. 1758-1763.
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