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A flexible and simplified calibration procedure for fringe projection profilometry

Vargas R.; Marrugo A.G.; Pineda J.; Romero L.A. (SPIE, 2019)

Fringe Projection Profilometry (FPP) is a widely used technique for optical three-dimensional (3D) shape measurement. Among the existing 3D shape measurement techniques, FPP provides a whole-field 3D reconstruction of ...

Restoration of retinal images with space-variant blur

Marrugo A.G.; Millán M.S.; Šorel M.; Šroubek F. (2014)

Retinal images are essential clinical resources for the diagnosis of retinopathy and many other ocular diseases. Because of improper acquisition conditions or inherent optical aberrations in the eye, the images are often ...

Developing a Robust Acquisition System for Fringe Projection Profilometry

Pineda J.; Marrugo A.G.; Romero L.A. (Institute of Physics Publishing, 2019)

Since Fringe Projection Profilometry (FPP) is an intensity-based coding strategy, it is prone to improper optical setup arrangement, surface texture and reflectance, uneven illumination distribution, among others. These ...

Improving the blind restoration of retinal images by means of point-spread-function estimation assessment

Marrugo A.G.; Millán M.S.; Šorel M.; Kotera J.; Šroubek F. (SPIE, 2015)

Retinal images often suffer from blurring which hinders disease diagnosis and progression assessment. The restoration of the images is carried out by means of blind deconvolution, but the success of the restoration depends ...

Noise-Robust Processing of Phase Dislocations using Combined Unwrapping and Sparse Inpainting with Dictionary Learning

Pineda J.; Meza J.; Barrios E.M.; Romero L.A.; Marrugo A.G. (Institute of Electrical and Electronics Engineers Inc., 2019)

The problem of phase unwrapping from a noisy and also incomplete wrapped phase map arises in many optics and image processing applications. In this work, we propose a noise-robust approach for processing regional phase ...

Robust automated reading of the skin prick test via 3D imaging and parametric surface fitting

Pineda J.; Vargas R.; Romero L.A.; Marrugo J.; Meneses J.; Marrugo A.G. (Public Library of Science, 2019)

The conventional reading of the skin prick test (SPT) for diagnosing allergies is prone to inter- and intra-observer variations. Drawing the contours of the skin wheals from the SPT and scanning them for computer processing ...

Evaluating the influence of camera and projector lens distortion in 3D reconstruction quality for fringe projection profilometry

Vargas R.; Marrugo A.G.; Pineda J.; Meneses J.; Romero L.A. (OSA - The Optical Society, 2018)

We study the influence of geometric distortions of the camera and projector lenses on 3D reconstruction quality for fringe projection profilometry. Experimental results on real objects and their 3D models show the accuracy ...

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 ...

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 ...

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.