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Sensors 2012, 12(12), 16482-16497;

Two-Dimensional Radial Laser Scanning for Circular Marker Detection and External Mobile Robot Tracking

Department of Computer Science and Industrial Engineering, University of Lleida, Jaume II, 69, 25001 Lleida, Spain
Author to whom correspondence should be addressed.
Received: 19 October 2012 / Revised: 22 November 2012 / Accepted: 23 November 2012 / Published: 28 November 2012
(This article belongs to the Special Issue Laser Sensing and Imaging)
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This paper presents the use of an external fixed two-dimensional laser scanner to detect cylindrical targets attached to moving devices, such as a mobile robot. This proposal is based on the detection of circular markers in the raw data provided by the laser scanner by applying an algorithm for outlier avoidance and a least-squares circular fitting. Some experiments have been developed to empirically validate the proposal with different cylindrical targets in order to estimate the location and tracking errors achieved, which are generally less than 20 mm in the area covered by the laser sensor. As a result of the validation experiments, several error maps have been obtained in order to give an estimate of the uncertainty of any location computed. This proposal has been validated with a medium-sized mobile robot with an attached cylindrical target (diameter 200 mm). The trajectory of the mobile robot was estimated with an average location error of less than 15 mm, and the real location error in each individual circular fitting was similar to the error estimated with the obtained error maps. The radial area covered in this validation experiment was up to 10 m, a value that depends on the radius of the cylindrical target and the radial density of the distance range points provided by the laser scanner but this area can be increased by combining the information of additional external laser scanners. View Full-Text
Keywords: laser scanning; laser; circle fitting; mobile robots localization laser scanning; laser; circle fitting; mobile robots localization

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Teixidó, M.; Pallejà, T.; Font, D.; Tresanchez, M.; Moreno, J.; Palacín, J. Two-Dimensional Radial Laser Scanning for Circular Marker Detection and External Mobile Robot Tracking. Sensors 2012, 12, 16482-16497.

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