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eISSN 2288-7105

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Phys. Ther. Korea 2022; 29(2): 87-93

Published online May 20, 2022

https://doi.org/10.12674/ptk.2022.29.2.87

© Korean Research Society of Physical Therapy

모션 캡처 시스템에 대한 고찰: 임상적 활용 및 운동형상학적 변인 측정 중심으로

임우택

우송대학교 보건복지대학 물리치료학과, 우송대학교 부설 재활과학연구소

A Review of Motion Capture Systems: Focusing on Clinical Applications and Kinematic Variables

Wootaek Lim , PT, PhD

Department of Physical Therapy, College of Health and Welfare, Woosong University, Woosong Institute of Rehabilitation Science, Woosong University, Daejeon, Korea

Correspondence to: Wootaek Lim
E-mail: wootaeklimpt@wsu.ac.kr
https://orcid.org/0000-0002-5523-6294

Received: April 4, 2022; Revised: May 10, 2022; Accepted: May 10, 2022

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

To solve the pathological problems of the musculoskeletal system based on evidence, a sophisticated analysis of human motion is required. Traditional optical motion capture systems with high validity and reliability have been utilized in clinical practice for a long time. However, expensive equipment and professional technicians are required to construct optical motion capture systems, hence they are used at a limited capacity in clinical settings despite their advantages. The development of information technology has overcome the existing limit and paved the way for constructing a motion capture system that can be operated at a low cost. Recently, with the development of computer vision-based technology and optical markerless tracking technology, webcam-based 3D human motion analysis has become possible, in which the intuitive interface increases the user-friendliness to non-specialists. In addition, unlike conventional optical motion capture, with this approach, it is possible to analyze motions of multiple people at simultaneously. In a non-optical motion capture system, an inertial measurement unit is typically used, which is not significantly different from a conventional optical motion capture system in terms of its validity and reliability. With the development of markerless technology and advent of non-optical motion capture systems, it is a great advantage that human motion analysis is no longer limited to laboratories.

Keywords: Acceleration, Kinematics, Kinetics, Orientation, Range of motion

Article

Review Article

Phys. Ther. Korea 2022; 29(2): 87-93

Published online May 20, 2022 https://doi.org/10.12674/ptk.2022.29.2.87

Copyright © Korean Research Society of Physical Therapy.

모션 캡처 시스템에 대한 고찰: 임상적 활용 및 운동형상학적 변인 측정 중심으로

임우택

우송대학교 보건복지대학 물리치료학과, 우송대학교 부설 재활과학연구소

Received: April 4, 2022; Revised: May 10, 2022; Accepted: May 10, 2022

A Review of Motion Capture Systems: Focusing on Clinical Applications and Kinematic Variables

Wootaek Lim , PT, PhD

Department of Physical Therapy, College of Health and Welfare, Woosong University, Woosong Institute of Rehabilitation Science, Woosong University, Daejeon, Korea

Correspondence to:Wootaek Lim
E-mail: wootaeklimpt@wsu.ac.kr
https://orcid.org/0000-0002-5523-6294

Received: April 4, 2022; Revised: May 10, 2022; Accepted: May 10, 2022

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

To solve the pathological problems of the musculoskeletal system based on evidence, a sophisticated analysis of human motion is required. Traditional optical motion capture systems with high validity and reliability have been utilized in clinical practice for a long time. However, expensive equipment and professional technicians are required to construct optical motion capture systems, hence they are used at a limited capacity in clinical settings despite their advantages. The development of information technology has overcome the existing limit and paved the way for constructing a motion capture system that can be operated at a low cost. Recently, with the development of computer vision-based technology and optical markerless tracking technology, webcam-based 3D human motion analysis has become possible, in which the intuitive interface increases the user-friendliness to non-specialists. In addition, unlike conventional optical motion capture, with this approach, it is possible to analyze motions of multiple people at simultaneously. In a non-optical motion capture system, an inertial measurement unit is typically used, which is not significantly different from a conventional optical motion capture system in terms of its validity and reliability. With the development of markerless technology and advent of non-optical motion capture systems, it is a great advantage that human motion analysis is no longer limited to laboratories.

Keywords: Acceleration, Kinematics, Kinetics, Orientation, Range of motion

Fig 1.

Figure 1.Classification of human motion capture system.
Physical Therapy Korea 2022; 29: 87-93https://doi.org/10.12674/ptk.2022.29.2.87

Fig 2.

Figure 2.Reflective markers of Vicon motion capture system (Vicon; Vicon Motion Systems, Oxford Metrics).
Physical Therapy Korea 2022; 29: 87-93https://doi.org/10.12674/ptk.2022.29.2.87

Fig 3.

Figure 3.An example of inertial measurement units (LegSys; BioSensics, Newton, MA, USA).
Physical Therapy Korea 2022; 29: 87-93https://doi.org/10.12674/ptk.2022.29.2.87

Fig 4.

Figure 4.An example of human pose estimation using OpenPose (4DEYE; SYM Healthcare, Seoul, Korea).
Physical Therapy Korea 2022; 29: 87-93https://doi.org/10.12674/ptk.2022.29.2.87

Fig 5.

Figure 5.An example of human motion tracking using mobile device (PTYOU; PTYOU, Daejeon, Korea).
Physical Therapy Korea 2022; 29: 87-93https://doi.org/10.12674/ptk.2022.29.2.87