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Sensors 2016, 16(12), 2011; doi:10.3390/s16122011

Anatomical Calibration through Post-Processing of Standard Motion Tests Data

1
Graduate School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan
2
Graduate School of Creative Science and Engineering, Waseda University, Tokyo 169-8555, Japan
3
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough LE11 3TU, UK
4
National Centre for Sport and Exercise Medicine, Loughborough LE11 3TU, UK
5
NIHR Leicester-Loughborough Diet, Lifestyle and Physical Activity Biomedical Research Unit, Loughborough LE11 3TU, UK
6
Department of Modern Mechanical Engineering, Waseda University, Tokyo 169-8555, Japan
7
Humanoid Robotics Institute (HRI), Waseda University, Tokyo 162-0044, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Jörg F. Wagner
Received: 3 October 2016 / Revised: 21 November 2016 / Accepted: 23 November 2016 / Published: 28 November 2016
(This article belongs to the Special Issue Inertial Sensors and Systems 2016)
View Full-Text   |   Download PDF [6536 KB, uploaded 28 November 2016]   |  

Abstract

The inertial measurement unit is popularly used as a wearable and flexible tool for human motion tracking. Sensor-to-body alignment, or anatomical calibration (AC), is fundamental to improve accuracy and reliability. Current AC methods either require extra movements or are limited to specific joints. In this research, the authors propose a novel method to achieve AC from standard motion tests (such as walking, or sit-to-stand), and compare the results with the AC obtained from specially designed movements. The proposed method uses the limited acceleration range on medial-lateral direction, and applies principal component analysis to estimate the sagittal plane, while the vertical direction is estimated from acceleration during quiet stance. The results show a good correlation between the two sets of IMUs placed on frontal/back and lateral sides of head, trunk and lower limbs. Moreover, repeatability and convergence were verified. The AC obtained from sit-to-stand and walking achieved similar results as the movements specifically designed for upper and lower body AC, respectively, except for the feet. Therefore, the experiments without AC performed can be recovered through post-processing on the walking and sit-to-stand data. Moreover, extra movements for AC can be avoided during the experiment and instead achieved through the proposed method. View Full-Text
Keywords: anatomical calibration; sensor-to-body alignment; functional calibration; inertial measurement unit; accelerometer; principal component analysis; motion test; walking; sit-to-stand; sagittal plane anatomical calibration; sensor-to-body alignment; functional calibration; inertial measurement unit; accelerometer; principal component analysis; motion test; walking; sit-to-stand; sagittal plane
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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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Kong, W.; Sessa, S.; Zecca, M.; Takanishi, A. Anatomical Calibration through Post-Processing of Standard Motion Tests Data. Sensors 2016, 16, 2011.

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