Method for large-scale structured-light system calibration
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Date
2021-05-24
Authors
Marrugo Hernández, Andrés Guillermo
Vargas, Raúl
Romero, Lenny A
Zhang, Song
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Abstract
We propose a multi-stage calibration method for increasing the overall accuracy of a
large-scale structured light system by leveraging the conventional stereo calibration approach
using a pinhole model. We first calibrate the intrinsic parameters at a near distance and then
the extrinsic parameters with a low-cost large-calibration target at the designed measurement
distance. Finally, we estimate pixel-wise errors from standard stereo 3D reconstructions and
determine the pixel-wise phase-to-coordinate relationships using low-order polynomials. The
calibrated pixel-wise polynomial functions can be used for 3D reconstruction for a given pixel
phase value. We experimentally demonstrated that our proposed method achieves high accuracy
for a large volume: sub-millimeter within 1200(H) × 800 (V) × 1000(D) mm3
.
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Citation
Andres G. Marrugo, Raul Vargas, Lenny A. Romero, and Song Zhang, "Method for large-scale structured-light system calibration," Opt. Express 29, 17316-17329 (2021)