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Pendulum-based method for determining the temporal accuracy of digital video-based motion capture systems.

Tracy Teeple1, Mónica Castañeta, Kevin Deluzio

  • 1Human Mobility Research Centre, Queen's University and Kingston General Hospital, Kingston, Ontario, Canada. teeple@me.queensu.ca

Gait & Posture
|November 11, 2008
PubMed
Summary

A new method assesses temporal accuracy in digital motion analysis systems. Some digital video cameras and software introduce frame inaccuracies, highlighting the need for pre-experiment evaluation.

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Area of Science:

  • Biomechanics
  • Motion Analysis
  • Digital Imaging

Background:

  • Digital video cameras are increasingly used in motion analysis.
  • Assessing the temporal accuracy of these systems is crucial for reliable data.

Purpose of the Study:

  • To develop a straightforward method for evaluating the temporal accuracy of motion analysis systems.
  • To identify potential sources of temporal error in systems using commercial digital video cameras.

Main Methods:

  • A planar column pendulum with a known natural frequency (0.872 Hz) was employed.
  • Five motion analysis systems with commercial cameras and a single codec were tested.
  • Frame rates were measured against the National Television Systems Committee (NTSC) standard (29.97 fps).

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Main Results:

  • Camera frame rates were within 3% of the NTSC standard.
  • Frame duplication artifacts were observed in some cameras.
  • Root-mean-square differences of 3-5% for angular position and 5-15% for angular speed were found compared to captured motion data.

Conclusions:

  • A simple method for evaluating temporal accuracy in digital motion capture systems was demonstrated.
  • Data compression in some digital video cameras and playback software can cause significant temporal inaccuracies.
  • Temporal accuracy assessment is recommended for digital-based human motion analysis systems before experimentation.