Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Evaluation of Accuracy and Inaccuracy of Depth Sensor based Kinect System for Motion Analysis in Specific Rotational Movement for Balance Rehabilitation Training

균형 재활 훈련을 위한 특정 회전 움직임에서 피검자 동작 분석을 위한 깊이 센서 기반 키넥트 시스템의 정확성 및 부정확성 평가

  • Kim, ChoongYeon (Department of Advanced Biomedical Engineering Lab., Korea Institue of Industrial Technology) ;
  • Jung, HoHyun (Mechanical Engineering, Sejong University) ;
  • Jeon, Seong-Cheol (R&D Team, Senior Products Industrial Center) ;
  • Jang, Kyung Bae (Mechanical and Control Engineering, The Cyber University of Korea Seoul) ;
  • Chun, Keyoung Jin (Department of Advanced Biomedical Engineering Lab., Korea Institue of Industrial Technology)
  • 김충연 (한국생산기술연구원 의료복지그룹) ;
  • 정호현 (세종대학교 기계공학과) ;
  • 전성철 (부산테크노파크 고령친화센터) ;
  • 장경배 (고려사이버대학교 기계제어공학과) ;
  • 전경진 (한국생산기술연구원 의료복지그룹)
  • Received : 2015.09.24
  • Accepted : 2015.10.14
  • Published : 2015.10.31
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Abstract

The balance ability significantly decreased in the elderly because of deterioration of the neural musculature regulatory mechanisms. Several studies have investigated methods of improving balance ability using real-time systems, but it is limited by the expensive test equipment and specialized resources. Recently, Kinect system based on depth data has been applied to address these limitations. Little information about accuracy/inaccuracy of Kinect system is, however, available, particular in motion analysis for evaluation of effectiveness in rehabilitation training. Therefore, the aim of the current study was to evaluate accuracy/inaccuracy of Kinect system in specific rotational movement for balance rehabilitation training. Six healthy male adults with no musculoskeletal disorder were selected to participate in the experiment. Movements of the participants were induced by controlling the base plane of the balance training equipment in directions of AP (anterior-posterior), ML (medial-lateral), right and left diagonal direction. The dynamic motions of the subjects were measured using two Kinect depth sensor systems and a three-dimensional motion capture system with eight infrared cameras for comparative evaluation. The results of the error rate for hip and knee joint alteration of Kinect system comparison with infrared camera based motion capture system occurred smaller values in the ML direction (Hip joint: 10.9~57.3%, Knee joint: 26.0~74.8%). Therefore, the accuracy of Kinect system for measuring balance rehabilitation traning could improve by using adapted algorithm which is based on hip joint movement in medial-lateral direction.

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References

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