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JRM Vol.33 No.6 pp. 1408-1422
doi: 10.20965/jrm.2021.p1408
(2021)

Paper:

Improved 3D Human Motion Capture Using Kinect Skeleton and Depth Sensor

Alireza Bilesan*, Shunsuke Komizunai*, Teppei Tsujita**, and Atsushi Konno*

*Graduate School of information Science and Technology, Hokkaido University
Kita 14, Nishi 9, Kita-ku, Sapporo, Hokkaido 060-0814, Japan

**Department of Mechanical Engineering, National Defense Academy of Japan
1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan

Received:
January 13, 2021
Accepted:
July 1, 2021
Published:
December 20, 2021
Keywords:
Kinect, motion capture, gait analysis, joint angles, humanoid robot
Abstract
Improved 3D Human Motion Capture Using Kinect Skeleton and Depth Sensor

A human gait is captured by Kinect, Perception Neuron, and OptiTrack

Kinect has been utilized as a cost-effective, easy-to-use motion capture sensor using the Kinect skeleton algorithm. However, a limited number of landmarks and inaccuracies in tracking the landmarks’ positions restrict Kinect’s capability. In order to increase the accuracy of motion capturing using Kinect, joint use of the Kinect skeleton algorithm and Kinect-based marker tracking was applied to track the 3D coordinates of multiple landmarks on human. The motion’s kinematic parameters were calculated using the landmarks’ positions by applying the joint constraints and inverse kinematics techniques. The accuracy of the proposed method and OptiTrack (NaturalPoint, Inc., USA) was evaluated in capturing the joint angles of a humanoid (as ground truth) in a walking test. In order to evaluate the accuracy of the proposed method in capturing the kinematic parameters of a human, lower body joint angles of five healthy subjects were extracted using a Kinect, and the results were compared to Perception Neuron (Noitom Ltd., China) and OptiTrack data during ten gait trials. The absolute agreement and consistency between each optical system and the robot data in the robot test and between each motion capture system and OptiTrack data in the human gait test were determined using intraclass correlations coefficients (ICC3). The reproducibility between systems was evaluated using Lin’s concordance correlation coefficient (CCC). The correlation coefficients with 95% confidence intervals (95%CI) were interpreted substantial for both OptiTrack and proposed method (ICC > 0.75 and CCC > 0.95) in humanoid test. The results of the human gait experiments demonstrated the advantage of the proposed method (ICC > 0.75 and RMSE = 1.1460°) over the Kinect skeleton model (ICC < 0.4 and RMSE = 6.5843°).

Cite this article as:
Alireza Bilesan, Shunsuke Komizunai, Teppei Tsujita, and Atsushi Konno, “Improved 3D Human Motion Capture Using Kinect Skeleton and Depth Sensor,” J. Robot. Mechatron., Vol.33, No.6, pp. 1408-1422, 2021.
Data files:
0.75 and CCC > 0.95) in humanoid test. The results of the human gait experiments demonstrated the advantage of the proposed method (ICC > 0.75 and RMSE = 1.1460°) over the Kinect skeleton model (ICC " />
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Last updated on May. 20, 2022