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Reconstruction accuracy in underwater three-dimensional kinematic analysis.

Vassilios Gourgoulis1, Nikolaos Aggeloussis, Panagiotis Kasimatis

  • 1Democritus University of Thrace, Department of Physical Education and Sport Science, Greece. vgoyrgoy@phyed.duth.gr

Journal of Science and Medicine in Sport
|June 5, 2007
PubMed
Summary

Underwater 3-D kinematic analysis accuracy was assessed using periscope systems. Results show reconstruction errors are suitable for swimming motion analysis despite refraction effects.

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Area of Science:

  • Biomechanics
  • Motion Analysis
  • Sports Science

Background:

  • Accurate kinematic data is crucial for calculating kinetic parameters in motion analysis, especially for swimming.
  • Underwater motion analysis presents challenges due to optical distortions like refraction.

Purpose of the Study:

  • To investigate the accuracy of underwater three-dimensional (3-D) kinematic analysis.
  • To evaluate the impact of calibration volume size on reconstruction accuracy.
  • To determine the suitability of periscope systems for underwater motion capture.

Main Methods:

  • Utilized two analogue cameras (60Hz) and two stationary periscope systems for underwater recording.
  • Employed two different-sized calibration frames for space calibration.
  • Assessed reconstruction accuracy in static and dynamic conditions, both underwater and out of water.

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Last Updated: Jul 14, 2026

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
06:09

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography

Published on: March 12, 2021

  • Calculated root mean square (RMS) error for static accuracy and percentage of RMS error for dynamic accuracy.

    • Main Results:

    • Static underwater analysis showed greater RMS error compared to dry analysis due to refraction.
    • Reconstruction errors increased along the longitudinal axis with larger calibration volumes.
    • Observed underwater reconstruction errors (transverse: 1.61-2.35mm; longitudinal: 2.99-4.64mm; vertical: 2.83-2.59mm) were deemed acceptable.

    Conclusions:

    • Periscope systems provide suitable accuracy for underwater 3-D kinematic analysis of swimming.
    • Calibration volume size influences longitudinal axis accuracy, necessitating careful consideration.
    • Refraction effects must be accounted for in underwater motion analysis protocols.