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Magnetic tracker calibration for an augmented reality system for therapy.

X Tian1, K V Ling, W S Ng

  • 1School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|April 28, 2001
PubMed
Summary

This study introduces new calibration methods to correct magnetic tracker inaccuracies caused by moving metallic objects in augmented reality therapy systems. These techniques significantly reduce quasi-static distortions for more reliable real-time measurements.

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Area of Science:

  • Computer Science
  • Robotics
  • Medical Technology

Background:

  • Magnetic trackers provide six-degree-of-freedom measurements for interactive systems.
  • Augmented Reality Therapy (ART) systems can utilize magnetic trackers for real-time position/orientation data.
  • Metallic environments cause magnetic field distortions, impacting tracker accuracy.

Purpose of the Study:

  • To discuss calibration methods for compensating magnetic tracker distortions caused by moving metallic objects.
  • To address the challenge of quasi-static distortions in ART environments, which are not constant over time.
  • To introduce novel compensation methods for quasi-static distortions, a problem not previously addressed in publications.

Main Methods:

  • Investigated magnetic tracker performance in metallic environments with moving objects.

Related Experiment Videos

  • Developed and introduced new calibration techniques to compensate for quasi-static magnetic field distortions.
  • Validated compensation methods by analyzing their effectiveness in reducing distortions.

    • Main Results:

    • Demonstrated that the proposed methods can significantly reduce quasi-static distortions.
    • Showcased the feasibility of compensating for dynamic magnetic field distortions in real-time applications.
    • Highlighted the importance of addressing quasi-static distortions for accurate ART systems.

    Conclusions:

    • The developed compensation methods are effective in mitigating quasi-static distortions in magnetic tracking.
    • Accurate real-time position/orientation measurement in ART systems is achievable even in challenging metallic environments.
    • This research advances the application of magnetic trackers in interactive therapy systems by addressing a critical accuracy limitation.