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A method to minimise error in 2D-DLT reconstruction of non-planar markers filmed with a moving camera

Author

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  • Laurène Holden-Douilly
  • Philippe Pourcelot
  • Henry Chateau
  • Sylvain Falala
  • Nathalie Crevier-Denoix

Abstract

This article describes a method that allows estimating, with the 2D version of the direct linear transformation (DLT), the actual 2D coordinates of a point when the latter is not strictly in the calibration plane. Markers placed in vertical line, above, below and in the centre of a horizontal calibration plane were filmed by a moving camera. Without correction, strong errors (up to 64.5%) were noticed for markers out of the calibration plane. After correction, calculated coordinates were consistent with actual values (error < 0.55%). The method was then applied to slip distance measurement, using a marker fixed on the hoof of a horse trotting on a calibrated track while being followed with a camera. The correction effect represented 6.6% of slip distance. Combined with the 2D-DLT transformation, the proposed corrective method allows an accurate measurement of slip distances, for high-speed outdoor locomotion analysis, using a moving camera.

Suggested Citation

  • Laurène Holden-Douilly & Philippe Pourcelot & Henry Chateau & Sylvain Falala & Nathalie Crevier-Denoix, 2013. "A method to minimise error in 2D-DLT reconstruction of non-planar markers filmed with a moving camera," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 16(9), pages 929-936, September.
    • Handle: RePEc:taf:gcmbxx:v:16:y:2013:i:9:p:929-936
    DOI: 10.1080/10255842.2011.644540
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