Examinando por Materia "COHERENCIA (ÓPTICA)"
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Ítem Computational aberration correction in optical coherence tomography with phase-unstable systems(Universidad EAFIT, 2020) Ruiz Lopera, Sebastián; Restrepo Gómez, RenéOptical coherence tomography (OCT) is an imaging technique widely use in medicine. OCT is an optical technique, therefore it is prone to optical aberrations that degrade image quality, making it difficult to visualize fine structures with high resolution.This work presents SHARP, a computational technique for correction of aberrations in OCT, that is compatible with most standard systems, and we present results in eye, airway and skin imagingÍtem Evaluación de la coherencia de la luz en la implementación de un sistema de microscopía óptica(Universidad EAFIT, 2017) Cadavid Muñoz, Juan José; Restrepo Gómez, RenéÍtem Improvement of the signal-to-noise ratio in digital holography(Sociedad Mexicana de Física, 2005-02) Velásquez-Prieto, Daniel; Herrera Ramírez, Jorge Alexis; García Sucerquia, Jorge Iván; Velásquez-Prieto, Daniel; Herrera Ramírez, Jorge Alexis; García Sucerquia, Jorge Iván; Universidad EAFIT. Departamento de Ciencias Básicas; dvelas@eafit.edu.co; Óptica AplicadaA fundamental problem in optical and digital holography is the presence of speckle noise in the reconstruction process, which essentially diminishes the signal to noise ratio (SNR). For many applications, that reduction of the SNR makes the digital holography impractical, so great number of approaches have been carried out in order to overcome such a problem. They range from modifying the spatial coherence of the illumination to the application of image processing techniques. In this paper we propose the merged use of digital image processing techniques in order to increase this SNR by reducing the speckle noise in the digital reconstruction of optically recorded Fresnel’s holograms. The proposed techniques are illustrated with experimental results.