Examinando por Materia "Holograma"

Mostrando 1 - 3 de 3
  • No hay miniatura disponible
    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 EAFIT
  • No hay miniatura disponible
    Ítem
    DC term filtering techniques in digital holography
    (SPIE, 2004-10-21) Velásquez-Prieto, Daniel; García Sucerquia, Jorge Iván; Herrera Ramírez, Jorge Alexis; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica Aplicada
    In numerical hologram reconstruction like in optical holography, there exist different diffraction orders, which many times produce difficulties for the image visualizations. In numerical reconstruction, the filtering of the DC term, or zero order diffraction, provides an improved utilization of the dynamic range of the visualization systems, which is needed for the right displaying purposes of reconstructed images. In the case of the in-line set-ups, the zero diffraction order has even more devastating effects because it does not allow reconstructing the images itself as in Gabor's holograms, so it is necessary to attempt a filtering of this DC term. In this work is shown a qualitative assessment of different techniques of DC term filtering applied to numerical reconstruction of Fresnel's holograms recorded by means of off-line set-ups.
  • No hay miniatura disponible
    Ítem
    ¿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)