Listar Productos de investigación por autor "Zhang, Song"
Mostrando ítems 1-8 de 8
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Hybrid calibration method for improving 3D measurement accuracy of structured light systems
Marrugo Hernández, Andrés Guillermo; Vargas, Raul; Zhang, Song; Romero, Lenny A. (Cartagena de Indias, 2020-08-21)In structured-light systems, the lens distortions of the camera and the projector reduce the measurement accuracy when calibrated as a standard stereo-vision system. The conventional compensation via distortion coefficients ... -
Hybrid calibration procedure for fringe projection profilometry based on stereo vision and polynomial fitting
Vargas, Raúl; Marrugo, G.; Romero, Lenny A.; Zhang, Song (Cartagena de IndiasIngeniería Mecatrónica, 2020-03-19)The key to accurate 3D shape measurement in fringe projection profilometry (FPP) is the proper calibration of the measurement system. Current calibration techniques rely on phase-coordinate mapping (PCM) or back-projection ... -
Method for large-scale structured-light system calibration
Marrugo Hernández, Andrés Guillermo; Vargas, Raúl; Romero, Lenny A; Zhang, Song (Cartagena de Indias, 2021-05-24)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 ... -
Pixel-wise rational model for a structured light system
Vargas, Raúl; Romero, Lenny A; Zhang, Song; Marrugo, Andrés G. (Cartagena de Indias, 2023-05-15)This Letter presents a novel structured light system model that effectively considers local lens distortion by pixel-wise rational functions. We leverage the stereo method for initial calibration and then estimate the ... -
State-of-the-art active optical techniques for three-dimensional surface metrology: a review [Invited]
Marrugo Hernández, Andrés Guillermo (Campus TecnológicoIngeniería Mecatrónica, 2020)This paper reviews recent developments of non-contact three-dimensional (3D) surface metrology using an active structured optical probe. We focus primarily on those active non-contact 3D surface measurement techniques that ... -
Toward an automatic 3D measurement of skin wheals from skin prick tests
Marrugo A.G.; Romero L.A.; Pineda J.; Vargas R.; Altamar Mercado, Hernando; Marrugo J.; Meneses J. (SPIE, 2019)The skin prick test (SPT) is the standard method for the diagnosis of allergies. It consists in placing an array of allergen drops on the skin of a patient, typically the volar forearm, and pricking them with a lancet to ... -
What is the best triangulation approach for a structured light system?
Meza, Jhacson; Vargas, Raúl; Romero, Lenny A.; Zhang, Song; Marrugo Hernández, Andrés Guillermo (Cartagena de Indias, 2020-05-18)It has become customary to calibrate a camera-projector pair in a structured light (SL) system as a stereo-vision setup. The 3D reconstruction is carried out by triangulation from the detected point at the camera sensor ... -
Wide-field 3D imaging with an LED pattern projector for accurate skin feature measurements via Fourier transform profilometry
Marrugo A.G.; Romero L.A.; Meneses J. (SPIE, 2019)Accurate 3D imaging of human skin features with structured light methods is hindered by subsurface scattering, the presence of hairs and patient movement. In this work, we propose a wide-field 3D imaging system capable of ...
Universidad Tecnológica de Bolívar - 2017 Institución de Educación Superior sujeta a inspección y vigilancia por el Ministerio de Educación Nacional. Resolución No 961 del 26 de octubre de 1970 a través de la cual la Gobernación de Bolívar otorga la Personería Jurídica a la Universidad Tecnológica de Bolívar.