Exploració per autor "Millán Garcia-Varela, M. Sagrario"
Ara es mostren els items 38-57 de 118
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First-order and multi-order diffractive lens using a device with 8P phase modulation range
Pérez Cabré, Elisabet; Millán Garcia-Varela, M. Sagrario (IEEE Press, 2016)
Comunicació de congrés
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FOTOGRAFIA I PROCESSAMENT DE LA IMATGE (Examen 1r quadrimestre, 2n parcial)
Millán Garcia-Varela, M. Sagrario (Universitat Politècnica de Catalunya, 2017-01-16)
Examen
Accés restringit a la comunitat UPC -
Generalized formulation of an encryption system based on a joint transform correlator and fractional Fourier transform
Vilardy Ortiz, Juan Manuel; Torres, Yezid; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (Institute of Physics (IOP), 2014-12-01)
Article
Accés obertWe propose a generalization of the encryption system based on double random phase encoding (DRPE) and a joint transform correlator (JTC), from the Fourier domain to the fractional Fourier domain (FrFD) by using the fractional ... -
Graphical ray tracing through imaging optical systems for optometrists
Millán Garcia-Varela, M. Sagrario; Escofet Soteras, Jaume; Pérez Cabré, Elisabet; Cobo Ruiz, Fernando (ITMO University (University of Information Technologies, Mechanics and Optics), 2008)
Comunicació de congrés
Accés restringit per política de l'editorialIn the approach of geometrical optics, ray tracing is an illustrative tool to determine the light path through an optical system. We show different educational resources used to help students to develop their skills ... -
Halo and Through-Focus Performance of Four Diffractive Multifocal Intraocular Lenses
Vega Lerín, Fidel; Alba Bueno, Francisco; Millán Garcia-Varela, M. Sagrario; Varón Puentes, Maria Consuelo; Gil Arnal, Miguel Ángel; Buil Calvo, José Antonio (2015-05-05)
Article
Accés obertPURPOSE. To compare, as a function of pupil size, the through-focus performance and halo features of four diffractive intraocular lenses (IOLs). METHODS. Three diffractive bifocal IOLs (ReSTOR þ2.5 D SV25T0, Tecnis þ2.75 ... -
Halo in extended depth of focus and bifocal intraocular lenses
Vega Lerín, Fidel; Azor Morón, Juan Antonio; Millán Garcia-Varela, M. Sagrario (2022-07)
Article
Accés restringit per política de l'editorialPurpose: To evaluate the size and intensity of the halos generated in distance vision by bifocal and extended depth of focus (EDOF) intraocular lenses (IOLs) as a function of pupil size, lens base power and lens addition. ... -
Halos and multifocal intraocular lenses: origin and interpretation
Alba Bueno, Francisco; Vega Lerín, Fidel; Millán Garcia-Varela, M. Sagrario (Elsevier, 2014-11-04)
Article
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Image encryption system based on a nonlinear joint transform correlator for the simultaneous authentication of two users
Vilardy Ortiz, Juan Manuel; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (2019-01-01)
Article
Accés obertWe propose a new encryption system based on a nonlinear joint transform correlator (JTC) using the information of two biometrics (one digital fingerprint for each user) as security keys of the encryption system. In order ... -
Image quality and security through nonlinear joint transform encryption
Vilardy Ortiz, Juan Manuel; Pérez Cabré, Elisabet; Millán Garcia-Varela, M. Sagrario (IEEE Press, 2016)
Text en actes de congrés
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Images encryption system based on a fractional joint transform correlator and nonlinear filtering
Vilardy Ortiz, Juan Manuel; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (2014)
Article
Accés obertA new optical security system for image encryption based on a fractional joint transform correlator and nonlinear filtering is proposed. The position of the lens in the proposed optical encryption setup can be chosen, so ... -
Impact of lens material on objective refraction in eyes with trifocal diffractive intraocular lenses
Garzón Jimenez, Nuria; Poyales, Francisco; García Montero, María; Vega Lerín, Fidel; Millán Garcia-Varela, M. Sagrario; Albarrán Diego, César (2021-01-01)
Article
Accés obertPurpose: Compare subjective (Rx) and objective (ObjRx) refractions outcomes with two autorefractors models and an aberrometer in eyes implanted with a hydrophobic trifocal IOL (FineVision POD F GF, Physiol, Liége, Belgium) ... -
Implementation of the parametric representation of the Fourier transform in fabrics
Cardenas, L. J.; Cifuentes, L.E; Torres, Y.; Millán Garcia-Varela, M. Sagrario (2007-06)
Article
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Improved decryption quality and security of a joint transform correlator-based encryption system
Vilardy, Juan Manuel; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (IOPScience, 2012-12-06)
Article
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Improved design of optical ID tags for remote validation
Horrillo, Sergi; Pérez Cabré, Elisabet; Millán Garcia-Varela, M. Sagrario; Javidi, Bahram (The International Society for Photo-Optical Instrumentation Engineers (SPIE), 2009)
Text en actes de congrés
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Improving the blind restoration of retinal images by means of point-spread-function estimation assessment
Marrugo Hernandez, Andrés Guillermo; Millán Garcia-Varela, M. Sagrario; Šorel, Michal; Kotera, Jan; Šroubek, Filip (2014)
Text en actes de congrés
Accés restringit per política de l'editorialRetinal 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 ... -
Influence of a perturbation in the Gyrator domain for a joint transform correlator-based encryption system
Vilardy Ortiz, Juan Manuel; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2017)
Comunicació de congrés
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Information compression for remote readable ID tags
Horrillo, Sergi; Pérez Cabré, Elisabet; Millán Garcia-Varela, M. Sagrario (Institute of Physics (IOP), 2010-10-29)
Article
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Integration of the photon-counting technique and a joint transform correlator to encrypt and authenticate images
Vilardy Ortiz, Juan Manuel; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (Red Iberoamericana de Óptica (RIAO), 2019)
Comunicació de congrés
Accés restringit per política de l'editorial -
Joint transform correlator-based encryption system using the Fresnel transform and nonlinear filtering
Vilardy Ortiz, Juan Manuel; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (2013)
Text en actes de congrés
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Lente programable multifocal: Combinación coaxial y multieje
Romero Pérez, Lenny Alexandra; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (2010)
Article
Accés obert