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UAB Digital Repository of Documents 7 records found  Search took 0.02 seconds. 
1.
28 p, 617.1 KB Spectral sharpening by spherical sampling / Finlayson, Graham D. (University of East Anglia) ; Vázquez i Corral, Javier (Universitat Autònoma de Barcelona. Departament de Ciències de la Computació) ; Süsstrunk, Sabine (École Polytechnique Fédéral de Lausanne) ; Vanrell i Martorell, Maria Isabel (Centre de Visió per Computador (Bellaterra, Catalunya))
There are many works in color that assume illumination change can be modeled by multiplying sensor responses by individual scaling factors. The early research in this area is sometimes grouped under the heading "von Kries adaptation": the scaling factors are applied to the cone responses. [...]
2012 - 10.1364/JOSAA.29.001199
Journal of the Optical Society of America A: Optics and Image Science, and Vision, Vol. 29, Issue 7 (July 2012) , p. 1199-1210  
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2.
20 p, 233.6 KB Color and luminance information in natural scenes / Parraga, Carlos Alejandro (University of Bristol. Department of Psychology) ; Brelstaff, G. (University of Bristol. Department of Psychology) ; Troscianko, Tom (University of Bristol. Department of Psychology) ; Moorhead, I. R. (Defence Evaluation and Research Agency (Regne Unit))
The spatial filtering applied by the human visual system appears to be low pass for chromatic stimuli and band pass for luminance stimuli. Here we explore whether this observed difference in contrast sensitivity reflects a real difference in the components of chrominance and luminance in natural scenes. [...]
1998 - 10.1364/JOSAA.15.000563
Journal of the Optical Society of America. Optics, image science, and vision, Vol. 15, Issue 3 (March 1998) , p. 563-569  
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3.
13 p, 966.5 KB Which tone-mapping operator is the best? A comparative study of perceptual quality / Cerdá Company, Xim (Universitat Autònoma de Barcelona. Departament de Ciències de la Computació) ; Parraga, Carlos Alejandro (Universitat Autònoma de Barcelona. Departament de Ciències de la Computació) ; Otazu Porter, Xavier (Centre de Visió per Computador (Bellaterra, Catalunya))
Tone-mapping operators (TMOs) are designed to generate perceptually similar low-dynamic-range images from high-dynamic-range ones. We studied the performance of 15 TMOs in two psychophysical experiments where observers compared the digitally generated tone-mapped images to their corresponding physical scenes. [...]
2018 - 10.1364/JOSAA.35.000626
Journal of the Optical Society of America. Optics, image science, and vision, Vol. 35, issue 4 (April 2018) , p. 626-638  
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4.
13 p, 829.4 KB Stability of the color-opponent signals under changes of illuminant in natural scenes / Lovell, P. G. (University of Bristol. Department of Experimental Psychology) ; Tolhurst, D. J. (University of Cambridge. Department of Physiology) ; Parraga, Carlos Alejandro (University of Bristol. Department of Experimental Psychology) ; Baddeley, R. (University of Bristol. Department of Experimental Psychology) ; Leonards, U. (University of Bristol. Department of Experimental Psychology) ; Troscianko, J. (University of Oxford. Department of Zoology) ; Troscianko, Tom (University of Bristol. Department of Experimental Psychology)
Illumination varies greatly both across parts of a natural scene and as a function of time, whereas the spectral reflectance function of surfaces remains more stable and is of much greater relevance when searching for specific targets. [...]
2005 - 10.1364/JOSAA.22.002060
Journal of the Optical Society of America. Optics, image science, and vision, Vol. 22, Issue 10 (October 2005) , p. 2060-2071  
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5.
18 p, 1.1 MB Self-sustained coherent phonon generation in optomechanical cavities / Navarro Urrios, Daniel (Institut Català de Nanociència i Nanotecnologia) ; Gomis-Bresco, Jordi (Institut Català de Nanociència i Nanotecnologia) ; Alzina, Francesc (Institut Català de Nanociència i Nanotecnologia) ; Capuj, Nestor Eduardo (Universidad de La Laguna) ; García Fernández, Pedro David (Institut Català de Nanociència i Nanotecnologia) ; Colombano Sosa, Martin (Institut Català de Nanociència i Nanotecnologia) ; Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia) ; Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)
Optical forces can set tiny objects in states of mechanical self-sustained oscillation, spontaneously generating periodic signals by extracting power from steady sources. Miniaturized self-sustained coherent phonon sources are interesting for applications such as mass-force sensing, intra-chip metrology and intra-chip time-keeping among others. [...]
2016 - 10.1088/2040-8978/18/9/094006
Journal of optics, Vol. 18, Núm. 9 (September 2016) , art. 94006  
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6.
19 p, 3.1 MB Enhancing spatio-chromatic representation with more-than-three color coding for image description / Rafegas Fonoll, Ivet (Centre de Visió per Computador (Bellaterra, Catalunya)) ; Vázquez Corral, Javier (Universitat Pompeu Fabra. Departament de Tecnologies de la Informació i les Comunicacions) ; Benavente i Vidal, Robert (Universitat Autònoma de Barcelona. Departament de Ciències de la Computació) ; Vanrell i Martorell, Maria Isabel (Universitat Autònoma de Barcelona. Departament de Ciències de la Computació) ; Álvarez, Susana (Universitat Rovira i Virgili. Departament d'Enginyeria Informàtica i Matemàtiques)
The extraction of spatio-chromatic features from color images is usually performed independently on each color channel. Usual 3D color spaces, such as RGB, present a high inter-channel correlation for natural images. [...]
2017 - 10.1364/JOSAA.34.000827
Journal of the Optical Society of America. Optics, image science, and vision, Vol. 34, Num. 5 (May 2017) , p. 827-837  
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7.
41 p, 3.4 MB Polarization gating based on Mueller matrices / Lizana Tutusaus, Ángel (Universitat Autònoma de Barcelona. Departament de Física) ; Van Eeckhout, Albert (Universitat Autònoma de Barcelona. Departament de Física) ; Adamczyk, Kamil (Universitat Autònoma de Barcelona. Departament de Física) ; Rodríguez, Carla (Universitat Autònoma de Barcelona. Departament de Física) ; Escalera Merino, Juan Carlos (Universitat Autònoma de Barcelona. Departament de Física) ; Garcia-Caurel, Enric (Université Paris Saclay. Laboratoire de Physique des Interfaces et des Couches Minces) ; Moreno, Ignacio (Universidad Miguel Hernández de Elche. Departamento de Ciencia de Materiales, Óptica y Tecnología Electrónica) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física)
We present mathematical formulas generalizing polarization gating (PG) techniques. PG refers to a collection of imaging methods based on the combination of different controlled polarization channels. [...]
2017 - 10.1117/1.JBO.22.5.056004
Journal of biomedical optics, Vol. 22, issue 5 (May 2017) , p. 56004-1-56004-14  
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