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Sensors 2016, 16(12), 2090; doi:10.3390/s16122090

An IMU-to-Body Alignment Method Applied to Human Gait Analysis

1
Postgraduate Program in Electrical Engineering, Federal University of Espirito Santo (UFES), 29075-910 Vitória-ES, Brazil
2
Postgraduate Program in Biotechnology, Federal University of Espirito Santo (UFES), 29040-090 Vitória-ES, Brazil
3
Neural and Cognitive Engineering Group, Centro de Automática y Robótica, CSIC-UPM, 28500 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Thurmon Lockhart
Received: 6 September 2016 / Revised: 11 November 2016 / Accepted: 1 December 2016 / Published: 10 December 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [2442 KB, uploaded 10 December 2016]   |  

Abstract

This paper presents a novel calibration procedure as a simple, yet powerful, method to place and align inertial sensors with body segments. The calibration can be easily replicated without the need of any additional tools. The proposed method is validated in three different applications: a computer mathematical simulation; a simplified joint composed of two semi-spheres interconnected by a universal goniometer; and a real gait test with five able-bodied subjects. Simulation results demonstrate that, after the calibration method is applied, the joint angles are correctly measured independently of previous sensor placement on the joint, thus validating the proposed procedure. In the cases of a simplified joint and a real gait test with human volunteers, the method also performs correctly, although secondary plane errors appear when compared with the simulation results. We believe that such errors are caused by limitations of the current inertial measurement unit (IMU) technology and fusion algorithms. In conclusion, the presented calibration procedure is an interesting option to solve the alignment problem when using IMUs for gait analysis. View Full-Text
Keywords: inertial sensor; joint angular kinematics; human motion analysis; anatomical calibration; technical frames inertial sensor; joint angular kinematics; human motion analysis; anatomical calibration; technical frames
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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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MDPI and ACS Style

Vargas-Valencia, L.S.; Elias, A.; Rocon, E.; Bastos-Filho, T.; Frizera, A. An IMU-to-Body Alignment Method Applied to Human Gait Analysis. Sensors 2016, 16, 2090.

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