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Determination of repeatability of kinect sensor.

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Telemedicine Journal and E-Health : the Official Journal of the American Telemedicine Association
|March 13, 2014
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Summary

The Kinect sensor demonstrates excellent intraday and interday repeatability for posture assessment, matching traditional marker-based systems. This cost-effective motion capture technology offers a viable alternative for biomechanical analysis.

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Area of Science:

  • Biomechanics
  • Motion analysis
  • Human movement science

Background:

  • The Microsoft Kinect sensor, initially for gaming, shows potential for biomechanical applications like posture and motion assessment.
  • Previous studies indicate promising capabilities for Kinect in biomechanical measurements.
  • The interday repeatability of the Kinect sensor for these applications remains largely unexplored.

Purpose of the Study:

  • To evaluate the intra- and interday repeatability of the Kinect sensor for posture assessment.
  • To compare the repeatability of the Kinect sensor against a standard stereophotogrammetric device.
  • To assess the accuracy of Kinect in measuring segment lengths during static posture.

Main Methods:

  • Forty subjects participated in the study.
  • Intra- and interday repeatability of the Kinect sensor and a stereophotogrammetric device were assessed.
  • Five static posture captures were performed per session, with simultaneous data recording from both devices.

Main Results:

  • Both Kinect and stereophotogrammetric devices showed high intraclass correlation coefficients (ICC) for intraday repeatability (Kinect: 0.94, Stereophotogrammetric: 0.98).
  • Interday repeatability was also comparable, with ICC values of 0.88 for Kinect and 0.87 for the stereophotogrammetric device.
  • These findings indicate consistent performance across different days for both systems.

Conclusions:

  • The Kinect sensor offers comparable repeatability to expensive, marker-based stereophotogrammetric systems for posture assessment.
  • This markerless, portable, and cost-effective camera technology presents a practical alternative for biomechanical analysis.
  • The study validates Kinect's utility in clinical and research settings for motion and posture evaluation.