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Sensors 2016, 16(12), 2097; doi:10.3390/s16122097

An Accurate Non-Cooperative Method for Measuring Textureless Spherical Target Based on Calibrated Lasers

Institute of Artificial Intelligence and Robotics, Xi’an Jiaotong University, Xi’an 710049, China
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 26 September 2016 / Revised: 1 December 2016 / Accepted: 2 December 2016 / Published: 9 December 2016
(This article belongs to the Section Physical Sensors)
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Abstract

Strong demands for accurate non-cooperative target measurement have been arising recently for the tasks of assembling and capturing. Spherical objects are one of the most common targets in these applications. However, the performance of the traditional vision-based reconstruction method was limited for practical use when handling poorly-textured targets. In this paper, we propose a novel multi-sensor fusion system for measuring and reconstructing textureless non-cooperative spherical targets. Our system consists of four simple lasers and a visual camera. This paper presents a complete framework of estimating the geometric parameters of textureless spherical targets: (1) an approach to calibrate the extrinsic parameters between a camera and simple lasers; and (2) a method to reconstruct the 3D position of the laser spots on the target surface and achieve the refined results via an optimized scheme. The experiment results show that our proposed calibration method can obtain a fine calibration result, which is comparable to the state-of-the-art LRF-based methods, and our calibrated system can estimate the geometric parameters with high accuracy in real time. View Full-Text
Keywords: non-cooperative target; pose estimation; sensor fusion; laser-camera system calibration; textureless target non-cooperative target; pose estimation; sensor fusion; laser-camera system calibration; textureless target
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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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Wang, F.; Dong, H.; Chen, Y.; Zheng, N. An Accurate Non-Cooperative Method for Measuring Textureless Spherical Target Based on Calibrated Lasers. Sensors 2016, 16, 2097.

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