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Accuracy and repeatability of joint angles measured using a single camera markerless motion capture system.
- Source :
-
Journal of biomechanics [J Biomech] 2014 Jan 22; Vol. 47 (2), pp. 587-91. Date of Electronic Publication: 2013 Nov 25. - Publication Year :
- 2014
-
Abstract
- Markerless motion capture systems have developed in an effort to evaluate human movement in a natural setting. However, the accuracy and reliability of these systems remain understudied. Therefore, the goals of this study were to quantify the accuracy and repeatability of joint angles using a single camera markerless motion capture system and to compare the markerless system performance with that of a marker-based system. A jig was placed in multiple static postures with marker trajectories collected using a ten camera motion analysis system. Depth and color image data were simultaneously collected from a single Microsoft Kinect camera, which was subsequently used to calculate virtual marker trajectories. A digital inclinometer provided a measure of ground-truth for sagittal and frontal plane joint angles. Joint angles were calculated with marker data from both motion capture systems using successive body-fixed rotations. The sagittal and frontal plane joint angles calculated from the marker-based and markerless system agreed with inclinometer measurements by <0.5°. The systems agreed with each other by <0.5° for sagittal and frontal plane joint angles and <2° for transverse plane rotation. Both systems showed a coefficient of reliability <0.5° for all angles. These results illustrate the feasibility of a single camera markerless motion capture system to accurately measure lower extremity kinematics and provide a first step in using this technology to discern clinically relevant differences in the joint kinematics of patient populations.<br /> (© 2013 Published by Elsevier Ltd.)
Details
- Language :
- English
- ISSN :
- 1873-2380
- Volume :
- 47
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Journal of biomechanics
- Publication Type :
- Academic Journal
- Accession number :
- 24315287
- Full Text :
- https://doi.org/10.1016/j.jbiomech.2013.11.031