Examinando por Autor "Velásquez Prieto, Daniel Ignacio"
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Ítem ¿Cómo se crean los hologramas?(Universidad de los Niños, 2018) Velásquez Prieto, Daniel Ignacio; Madrid Sánchez, Alejandro; Londoño Rivera, Ana María; Gutiérrez Ardila, Marcela; Universidad EAFITÍtem ¿Es real todo lo que percibimos con nuestros ojos?(2012) Velásquez Prieto, Daniel Ignacio; Abad Restrepo, Ana Cristina; Daniel Velásquez (dvelas@eafit.edu.co); Ana Cristina Abad (abad@eafit.edu.co)Ítem ¿Por qué existen los colores?(2017) Velásquez Prieto, Daniel Ignacio; Londoño Rivera, Ana María; Muriel Gil, Luisa Fernanda; Arango Hurtado, Carolina; Universidad EAFITÍtem Three-dimensional surface contouring of macroscopic objects by means of phase-difference images(OSA, 2006-04-16) García Sucerquia, Jorge Iván; Velásquez Prieto, Daniel Ignacio; García Sucerquia, Jorge Iván; Velásquez Prieto, Daniel Ignacio; Universidad EAFIT. Departamento de Ciencias Básicas; dvelas@eafit.edu.co; Óptica AplicadaWe report a technique to determine the 3D contour of objects with dimensions of at least 4 orders of magnitude larger than the illumination optical wavelength. Our proposal is based on the numerical reconstruction of the optical wave field of digitally recorded holograms. The required modulo 2 phase map in any contouring process is obtained by means of the direct subtraction of two phase-contrast images under different illumination angles to create a phase-difference image of a still object. Obtaining the phase-difference images is only possible by using the capability of numerical reconstruction of the complex optical field provided by digital holography. This unique characteristic leads us to a robust, reliable, and fast procedure that requires only two images. A theoretical analysis of the contouring system is shown, with verification by means of numerical and experimental results. © 2006 Optical Society of America