Marrugo Hernández, Andrés GuillermoVargas, RaúlRomero, Lenny AZhang, Song2021-08-032021-08-032021-05-242021-08-03Andres G. Marrugo, Raul Vargas, Lenny A. Romero, and Song Zhang, "Method for large-scale structured-light system calibration," Opt. Express 29, 17316-17329 (2021)https://hdl.handle.net/20.500.12585/10352We 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 .application/pdfenghttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/article10.1364/OE.422327Image reconstructionPixelsCalibration methodCalibration targetsExtrinsic parameterIntrinsic parametersLow-order polynomialsPolynomial functionsStereo calibrationStructured light systemsinfo:eu-repo/semantics/openAccessAttribution-NonCommercial-NoDerivatives 4.0 InternacionalUniversidad Tecnológica de BolívarRepositorio Universidad Tecnológica de BolívarLEMB14 páginas