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

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

Computer Methods in Biomechanics and Biomedical Engineering, 2013, vol. 16, issue 9, 929-936

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.

Date: 2013
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DOI: 10.1080/10255842.2011.644540

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