Now showing items 1-20 of 117

    • 20/21 Central Event in Spain of the International Day of Light: outreach and citizen engagement in time of pandemic 

      Pérez Cabré, Elisabet; Millán Garcia-Varela, M. Sagrario; Armengol Cebrian, Jesús (Optica Publishing Group, 2021)
      Conference report
      Restricted access - publisher's policy
      The 3rd central IDL Event in Spain probably gathered the largest number of activities for the 16th May commemoration in 2021. Conferences, debates, workshops, exhibitions, light shows, and photo contests, adapted to severe ...
    • Alumbrar el pasado 

      Millán Garcia-Varela, M. Sagrario (2019-12-16)
      Article
      Open Access
      Reseña del libro "El pionero de la luz: Alhacén y su Libro de la Óptica", por MARÍA LUISA CALVO PADILLA y publicado por Ediciones Complutense, Madrid, 2019
    • Automated corneal endothelium image segmentation in the presence of cornea guttata via convolutional neural networks - 115110H 

      Sierra Bravo, Juan Sebastián; Pineda, Jesús; Viteri Coronel, Eduardo; Rueda Latorre, Daniela; Tibaduiza Vargas, Beatriz Eugenia; Berrospi, Rubén; Tello, Alejandro; Galvis Ramírez, Virgilio; Volpe, Giovanni; Millán Garcia-Varela, M. Sagrario; Romero Pérez, Lenny Alexandra; Marrugo Hernandez, Andrés Guillermo (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2020)
      Conference report
      Restricted access - publisher's policy
      Automated cell counting in in-vivo specular microscopy images is challenging, especially in situations where single-cell segmentation methods fail due to pathological conditions. This work aims to obtain reliable cell ...
    • Beam-shaping extended depth of focus intraocular lens: optical assessment with corneas of increasing spherical aberration 

      Madrid Costa, David; Fernández-Vega Cueto, Luis; Azor Morón, Juan Antonio; Vega Lerín, Fidel; Millán Garcia-Varela, M. Sagrario; Alfonso, José F. (2023-02)
      Article
      Open Access
      PURPOSE:To assess the optical quality and halo formation of a beam-shaping extended depth-of-focus (EDOF) intraocular lens (IOL) (AcrySof IQ Vivity; Alcon Laboratories, Inc) with corneas of long-range spherical aberration ...
    • Blas Cabrera Felipe, el producto puro del tesón 

      Millán Garcia-Varela, M. Sagrario (2019-06-28)
      Article
      Open Access
      Ecos del discurso de ingreso en la Real Academia Española: Bajando por mi rama en el árbol de la genealogía académica, llegué un día hasta Blas Cabrera Felipe. Quise bajar más y saber quién le había dirigido la tesis. No ...
    • Blind restoration of retinal images degraded by space-variant blur with adaptive blur estimation 

      Marrugo Hernández, Andrés Guillermo; Millán Garcia-Varela, M. Sagrario; Šorel, M.; Šroubek, F. (2013)
      Conference report
      Restricted access - publisher's policy
    • Caracterización espacial de un microdisplay AMOLED verde 

      Azor Morón, Juan Antonio; Millán Garcia-Varela, M. Sagrario (Red Iberoamericana de Óptica (RIAO), 2019)
      Conference lecture
      Restricted access - publisher's policy
    • Caracterización espacial y espectral de un microdisplay AMOLED en color 

      Azor Morón, Juan Antonio; Millán Garcia-Varela, M. Sagrario (Universidad de Zaragoza (UZA), 2019)
      Conference lecture
      Restricted access - publisher's policy
      Se presenta la caracterización de un microdisplay con pantalla AMOLED en color para su uso en el laboratorio de investigación óptica, en particular, para iluminar y representar el test de entrada en un sistema de procesado ...
    • Clinical assessment of chromatic aberration in phakic and pseudophakic eyes 

      Millán Garcia-Varela, M. Sagrario; Vega Lerín, Fidel; Garzon, Nuria (Red Iberoamericana de Óptica (RIAO), 2019)
      Conference report
      Restricted access - publisher's policy
      We present a psychophysical method and a simple setup for the clinical assessment of the longitudinal chromatic aberration (LCA) in phakic and pseudophakic eyes. A proof of concept built from inexpensive and non-sophisticated ...
    • Clinical assessment of chromatic aberration in phakic and pseudophakic eyes using a simple autorefractor 

      Millán Garcia-Varela, M. Sagrario; Vega Lerín, Fidel; Poyales, Francisco; Garzon, Nuria (2019-08-01)
      Article
      Open Access
      We describe a psychophysical method and a simple setup – an autorefractor with a Scheiner disc, sequentially illuminated with red and blue lights – for the clinical assessment of the longitudinal chromatic aberration (LCA) ...
    • Codificación de la función de fase de una lente compuesta multifocal presentada por un modulador LCoS 

      Romero Pérez, Lenny Alexandra; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (2009)
      Conference lecture
      Restricted access - publisher's policy
    • Comparison of visual and optical quality of monofocal versus multifocal intraocular lenses 

      Altemir Gómez, I.; Millán Garcia-Varela, M. Sagrario; Vega Lerín, Fidel; Bartol Puyal, Francisco; Giménez Calvo, G.; Larrosa, Jose Manuel; Polo Llorens, Vicente; Pablo Júlvez, Luis E.; García Martín, Elena (2019-02-10)
      Article
      Open Access
    • Comparison of visual performance between two aspheric monofocal intraocular lens models 

      Poyales, Francisco; Garzon, Nuria; Rico del Viejo Miranza, Laura; Zhou, Ying; Millán Garcia-Varela, M. Sagrario; Vega Lerín, Fidel (Taylor & Francis, 2021-12-07)
      Article
      Open Access
      Clinical relevance It is important to distinguish between visual acuity, optical quality and quality of vision when outcomes obtained with intraocular lenses are evaluated. These parameters, that includeobjective and ...
    • Connectivity-based segmentation of retinal vessels in eye fundus images 

      Rallo Capdevila, Miguel; Millán Garcia-Varela, M. Sagrario (2017-12)
      Article
      Open Access
      © Sociedad Española de Óptica. A new unsupervised method for segmentation of objects of diverse nature with the common feature of connectivity (e.g. branching trees or net-shaped objects) is proposed. A preferred application ...
    • Corneal endothelium assessment in specular microscopy images with Fuchs’ dystrophy via deep regression of signed distance maps 

      Sierra Bravo, Juan Sebastián; Pineda, Jesús; Rueda Latorre, Daniela; Trello, Alejandro; Prada, Angélica M.; Galvis Ramírez, Virgilio; Volpe, Giovanni; Millán Garcia-Varela, M. Sagrario; Romero Pérez, Lenny Alexandra; Marrugo Hernandez, Andrés Guillermo (2023-01-01)
      Article
      Open Access
      Specular microscopy assessment of the human corneal endothelium (CE) in Fuchs’ dystrophy is challenging due to the presence of dark image regions called guttae. This paper proposes a UNet-based segmentation approach that ...
    • Correlation between polychromatic image quality metrics to predict visual acuity in pseudophakic patients 

      Armengol Cebrian, Jesús; Garzon, Nuria; Vega Lerín, Fidel; Altemir Gómez, I.; Millán Garcia-Varela, M. Sagrario (EPJ Web of Conferences, 2020)
      Conference lecture
      Open Access
      The optical quality of three multifocal intraocular lenses (MIOLs) was measured in vitro using the area under the modulation transfer function (MTFa) and energy efficiency (EE). We evaluated those metrics through-focus ...
    • Detection and removal of dust artifacts in retinal images via sparse-based inpainting 

      Barrios Montes, Erik Miguel; Sierra, E.; Romero Pérez, Lenny Alexandra; Millán Garcia-Varela, M. Sagrario; Marrugo Hernandez, Andrés Guillermo (2021-09)
      Article
      Open Access
      Dust particle artifacts are present in all imaging modalities but have more adverse consequences in medical images like retinal images. They could be mistaken as small lesions, such as microaneurysms. We propose a method ...
    • Diseño y caracterización de un dispositivo óptico para la evaluación de lentes intraoculares in vitro 

      Azor Morón, Juan Antonio; Mendoza Párraga, Alison Lizbeth; Vega Lerín, Fidel; Millán Garcia-Varela, M. Sagrario (Comité de Optoelectrónica, 2021)
      Conference lecture
      Restricted access - publisher's policy
      Se ha realizado el diseño y la caracterización de un dispositivo en banco óptico, que incorpora un nuevo modelo de ojo fisiológico y un sistema de óptica adaptativa controlado por ordenador, para la evaluación in vitro de ...
    • Double image encryption system using a nonlinear joint transform correlator in the Fourier domain 

      Pérez, Ronal A; Pérez Cabré, Elisabet; Vilardy Ortiz, Juan Manuel; Millán Garcia-Varela, M. Sagrario; Torres Moreno, Cesar Orlando (Multidisciplinary Digital Publishing Institute (MDPI), 2023-02-02)
      Article
      Open Access
      In this work, we present a new nonlinear joint transform correlator (JTC) architecture in the Fourier domain (FD) for the encryption and decryption of two simultaneous images. The main features of the proposed system are ...
    • Dust particle artifact detection and removal in retinal images 

      Sierra, E.; Marrugo Hernandez, Andrés Guillermo; Millán Garcia-Varela, M. Sagrario (2017-12-01)
      Article
      Restricted access - publisher's policy
      Retinal fundus cameras suffer from dust particles attaching to the sensor and lens, which manifest as small artifacts on the images. We propose a new strategy for the detection and removal of dust particle artifacts in ...