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Ara es mostren els items 92-111 de 118

    • Removing dust artifacts in retinal images via dictionary learning and sparse-based inpainting 

      Barrios Montes, Erik Miguel; Marrugo Hernandez, Andrés Guillermo; Millán Garcia-Varela, M. Sagrario (Institute of Electrical and Electronics Engineers (IEEE), 2019)
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      In the field of ophthalmology, retinal images are essential for the diagnosis of many diseases. These images are acquired with a device called the retinal camera. However, often small dust particles in the sensor produce ...

    • Restoration of retinal images with space-variant blur 

      Marrugo Hernandez, Andrés Guillermo; Millán Garcia-Varela, M. Sagrario; Šorel, Michal; Šroubek, Filip (2014-01-01)
      Article
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      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 ...

    • Retinal vessel local tortuosity under a macula-to-optic disc central-framing change 

      Ramírez Cano, Natalia; Rallo Capdevila, Miguel; Millán Garcia-Varela, M. Sagrario (2023-03-01)
      Article
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      Some ocular and cardiovascular diseases can be detected through the increased tortuosity of retinal blood vessels. Objective tortuosity measures can be obtained from digital image analysis of a retinography. This study ...

    • Roadmap on optical security 

      Javidi, Bahram; Pérez Cabré, Elisabet; Millán Garcia-Varela, M. Sagrario (Institute of Physics (IOP), 2016)
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    • Robust detection and removal of dust artifacts in retinal images via dictionary learning and sparse-based inpainting 

      Sierra, E.; Barrios Montes, Erik Miguel; Marrugo Hernandez, Andrés Guillermo; Millán Garcia-Varela, M. Sagrario (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2019)
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      Retinal images are acquired with eye fundus cameras which, like any other camera, can suffer from dust particles attached to the sensor and lens. These particles impede light from reaching the sensor, and therefore they ...

    • Secure image encryption and authentication using the photon counting technique in the Gyrator domain 

      Vilardy Ortiz, Juan Manuel; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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    • Secure verification by multifactor optical validation 

      Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet; Javidi, Bahram (The International Society of Optical Engineering - SPIE, 2006)
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    • SEDOPTICA newsletter: noticias de SEDOPTICA 

      Moreno, Ignacio; Millán Garcia-Varela, M. Sagrario; Vallmitjana Rico, Santiago (2019-12-16)
      Article
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      El boletín de noticias de SEDOPTICA recoge la actividad de la sociedad y de sus miembros en el cuarto y último trimestre del año 2019.

    • SEDOPTICA newsletter: noticias de SEDOPTICA 

      Moreno, Ignacio; Millán Garcia-Varela, M. Sagrario; Vallmitjana Rico, Santiago (2019-09-16)
      Article
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      El boletín de noticias de SEDOPTICA recoge la actividad de la sociedad y sus miembros en el tercer trimestre del año 2019.

    • SEDOPTICA newsletter: noticias de SEDOPTICA 

      Moreno, Ignacio; Millán Garcia-Varela, M. Sagrario; Vallmitjana Rico, Santiago (2019-06-17)
      Article
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      El boletín de noticias de SEDOPTICA recoge la actividad de la sociedad y sus miembros en el segundo trimestre de 2019.

    • SEDOPTICA newsletter: noticias de SEDOPTICA 

      Millán Garcia-Varela, M. Sagrario; Moreno, Ignacio; Vallmitjana Rico, Santiago (2019-03-16)
      Article
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      Primer boletín de SEDOPTICA del año 2019 que recoge la intensa actividad de la sociedad y sus miembros en el primer trimestre.

    • Simulador óptico de lentes intraoculares multifocales difractivas mediante un modulador espacial sólo de fase 

      Valentino Herrera, María Teresa; Pérez Cabré, Elisabet; Vega Lerín, Fidel; Millán Garcia-Varela, M. Sagrario (2021-05-13)
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    • Skin color correction via convolutional neural networks in 3D fringe projection profilometry 

      Barrios Montes, Erik Miguel; Pineda, Jesús; Romero Pérez, Lenny Alexandra; Millán Garcia-Varela, M. Sagrario; Marrugo Hernandez, Andrés Guillermo (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2021)
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      Fringe Projection Profilometry (FPP) with Digital Light Projector technology is one of the most reliable 3D sensing techniques for biomedical applications. However, besides the fringe pattern images,often a color texture ...

    • Spatial and speed characterization of a phase-only LCoS spatial light modulator for an improved performance in optical information processing 

      Otón, Joaquín; Millán Garcia-Varela, M. Sagrario; Ambs, Pierre; Pérez Cabré, Elisabet (ITMO University (University of Information Technologies, Mechanics and Optics), 2008)
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    • Spatio-chromatic vision with multifocal diffractive intraocular lens 

      Millán Garcia-Varela, M. Sagrario; Clavé Cerezo, Laura; Torrents Gómez, Aurora; Armengol Cebrian, Jesús; Vega Lerín, Fidel (Elsevier, 2023-08-01)
      Article
      Accés obert
      Background This study aims to detect alterations in the spatio-chromatic pseudophakic vision produced by multifocal diffractive intraocular lenses (IOLs) and provides a physical interpretation. Methods In vitro characterization ...

    • Static and dynamic amplitude modulation of light in a twisted nematic liquid crystal display 

      Vilardy Ortiz, Juan Manuel; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2013)
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      A SLM has been experimentally characterized in terms of amplitude modulation versus the gray level distribution (input signal) electronically addressed to the pixelated display in two conditions: input constant with time, ...

    • Stereo-Acuity in Patients Implanted with Multifocal Intraocular Lenses: Is the Choice of Stereotest Relevant? 

      Varón Puentes, Maria Consuelo; Gil Arnal, Julian Miguel Ángel; Alba Bueno, Francisco; Cardona Torradeflot, Genís; Vega Lerín, Fidel; Millán Garcia-Varela, M. Sagrario; Buil Calvo, José Antonio (2014-07-01)
      Article
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      Purpose: A randomized and double-blinded study design was implemented to assess the stereo-acuity in patients symmetrically implanted with four types of multifocal intraocular lenses (MIOLs), compared to a monofocal lens ...

    • Through-focus energy efficiency and longitudinal chromatic aberration of three presbyopia-correcting intraocular lenses 

      Millán Garcia-Varela, M. Sagrario; Vega Lerín, Fidel (2020-01-01)
      Article
      Accés obert
      Purpose: To compare the chromatic performance of the Bausch & Lomb Versario 3F trifocal intraocular lens (IOL) with the PhysIOL FineVision MicroF trifocal IOL and the Johnson & Johnson Vision TECNIS Symfony ZXR00 extended ...

    • Tolerance to residual astigmatism of an isofocal intraocular lens 

      Pérez Sanz, Lidia; Vega Lerín, Fidel; Azor Morón, Juan Antonio; Cuellar Santiago, Fátima; Millán Garcia-Varela, M. Sagrario; Garzón Jimenez, Nuria (Springer Nature, 2023-11-11)
      Article
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      Purpose To evaluate the impact of residual astigmatism on the optical and visual performance of an enhanced-monofocal isofocal intraocular lens (EM Isopure, BVI medical, Belgium) compared to a monofocal one (Micropure, BVI ...

    • Toward and ophtalmic imaging system with extended depth of focus using the asymmetric phase mask 

      Romero Pérez, Lenny Alexandra; Marrugo Hernandez, Andrés Guillermo; Millán Garcia-Varela, M. Sagrario (Red Iberoamericana de Óptica (RIAO), 2019)
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      We study the trade-off of extending the depth-of-focus with an asymmetric phase mask optical element and the decrease of image quality in terms of a numerical optimization scheme that could be used in ophthalmic imaging systems.