Publication

On the Criteria for Configurations Selection in Robot Calibration

Henry Carrillo, Oliver Birbach, Holger Täubig, Berthold Bäuml, Udo Frese, José A. Castellanos

In: Proceedings of the IEEE International Conference on Robotics and Automation. IEEE International Conference on Robotics and Automation (ICRA-13) May 6-10 Karlsruhe Germany Pages 3638-3644 IEEE 5/2013.

Abstract

This paper studies different criteria for selecting configurations for the task of calibrating a robotic system. Given an automatic and self-contained procedure which allows the robot to calibrate itself without the need of external tools, we are interested in how to select the set of configurations that maximize calibration accuracy while minimizing calibration time. We experiment with the active calibration of a multisensorial humanoid’s upper body and report that determinant based criteria should be preferred when a greedy selection is used. In addition to criteria comparison, we further propose a new criterion for configuration selection. Its novelty stems from a direct treatment of the robot’s end-effector tool variance. This is contrary to previous approaches which target the variance indirectly via calibration parameters. Our proposed objective function is derived as a compact formulation from the mean error of the robot’s end-effector tool from which its variance can be computed using traditional criteria known from the theory of optimal experimental design (e.g. A-optimality).

German Research Center for Artificial Intelligence
Deutsches Forschungszentrum für Künstliche Intelligenz