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Articles 39 records found  beginprevious24 - 33next  jump to record: Search took 0.01 seconds. 
24.
3 p, 1.9 MB Detection theory approach to multichannel pattern location / Guillaume, M. (Ecole Nationale Supérieure de Physique de Marseille) ; Réfrégier, Ph. (Ecole Nationale Supérieure de Physique de Marseille) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Lashin, Vladimir (Universitat Autònoma de Barcelona. Departament de Física)
We propose and assess new algorithms for detecting and locating an object in multichannel images. These algorithms are optimal for additive Gaussian noise and maximize the likelihood of the observed images. [...]
1997 - 10.1364/OL.22.001887
Optics letters, Vol. 22, No. 24 (15 December 1997) , p. 1887-1889  
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25.
3 p, 1016.2 KB Color pattern recognition with circular component whitening / Moreno, Ignacio (Universitat Autònoma de Barcelona. Departament de Física) ; Kober, Vitaly (Universitat Autònoma de Barcelona. Departament de Física) ; Lashin, Vladimir (Universitat Autònoma de Barcelona. Departament de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Yaroslavsky, Leonid P. (Tel Aviv University. Department of Interdisciplinary Studies) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
Polychromatic object recognition based on circular whitening preprocessing of red-green-blue components and multichannel matched filtering is described. Computer simulations and experimental results are provided to facilitate recognizing a color target among objects of similar shape but with different color contents. [...]
1996 - 10.1364/OL.21.000498
Optics letters, Vol. 21, No. 7 (1 April 1996) , p. 498-500  
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26.
3 p, 261.5 KB Second-harmonic generation in local modes of a truncated periodic structure / Trull Silvestre, Jose Francisco (Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; Vilaseca, Ramon (Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear) ; Martorell, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
We present an experimental study of the generation of second-harmonic light in a one-dimensional periodic structure truncated by the introduction of a defect in the central period. We observed an enhancement of the nonlinear interaction in the vicinity of the defect when the second-harmonic wave was excited for modes within the forbidden zone or stop band. [...]
1995 - 10.1364/OL.20.001746
Optics letters, Vol. 20, No. 17 (1 September 1995) , p. 1746-1748  
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27.
3 p, 289.0 KB Full polarization chaos in a pump-polarization modulated isotropic cavity laser / Kul'minskii, A. (Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; Vilaseca, Ramon (Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear)
We study the dynamic behavior of an optically pumped J = 0 → J = 1 → J = 0 laser operating with an isotropic ring cavity and a linearly polarized pump field whose direction of polarization is modulated by the sinusoidal law θ(t) = m sin Ωt. [...]
1995 - 10.1364/OL.20.002390
Optics letters, Vol. 20, No. 23 (1 December 1995) , p. 2390-2392  
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28.
3 p, 273.6 KB Derivation of weighting coefficients for multiplexed phase-diffractive elements / Carcolé, Eduard (Universitat Politècnica de Catalunya. Escola Universitària d'Òptica de Terrassa) ; Millán García-Varela, M. Sagrario (Universitat Politècnica de Catalunya. Escola Universitària d'Òptica de Terrassa) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física)
We mathematically analyze the phase-only hologram constructed by taking the phase corresponding to the linear combination of two weighted phase functions. We show that this phase-only hologram may be written as a new linear combination for the original phase functions with new weights. [...]
1995 - 10.1364/OL.20.002360
Optics letters, Vol. 20, No. 23 (1 December 1995) , p. 2360-2362  
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29.
3 p, 357.5 KB Phase-only filter with improved discrimination / Ahouzi, Esmail (Universitat Autònoma de Barcelona. Departament de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
The optimization of a phase-only filter (POF) in terms of discrimination capability is presented. The notion of a phase-difference histogram and its modification are proposed for selecting the support function of the POF. [...]
1994 - 10.1364/OL.19.001340
Optics letters, Vol. 19, No. 17 (1 September 1994) , p. 1340-1342  
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30.
3 p, 463.8 KB Optimal filter approximation by means of a phase-only filter with quantization / Kober, Vitaly (Universitat Autònoma de Barcelona. Departament de Física) ; Yaroslavsky, Leonid P. (National Institutes of Health (Bethesda, Estats Units d'Amèrica)) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
Approximate filters based on a phase-only filter for reliable recognition of objects are proposed. Good light efficiency and discrimination capability close to that of the optimal filter can be obtained. [...]
1994 - 10.1364/OL.19.000978
Optics letters, Vol. 19, No. 13 (1 July 1994) , p. 978-980  
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31.
8 p, 354.7 KB Quantum learning without quantum memory / Sentís Herrera, Gael (Universitat Autònoma de Barcelona. Departament de Física) ; Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física)
A quantum learning machine for binary classification of qubit states that does not require quantum memory is introduced and shown to perform with the minimum error rate allowed by quantum mechanics for any size of the training set. [...]
2012 - 10.1038/srep00708
Scientific reports, Vol. 2, art. 708 (October 2012)  
Detailed record - Creative Commons
32.
26 p, 1.1 MB Evaluación de la enseñanza problematizada sobre la luz y la visión en la educación secundaria obligatoria / Osuna García, Luis (Universitat d'Alacant) ; Martínez Torregrosa, Joaquín (Universitat d'Alacant) ; Menargues Marcilla, Asunción (Universitat d'Alacant)
Después de la planificación de la enseñanza problematizada sobre la luz y la visión para la ESO (12-16 años) y haber obtenido pruebas empíricas de su relevancia didáctica potencial (Osuna et al. [...]
Following the planning of problem-based teaching about light and vision for ESO (12-16 years) and obtaining empirical evidence of its potential educational relevance (Osuna el al. , 2007), this new work presents the results of the implementation of a teaching sequence designed according to that planning. [...]
2012 - 10.5565/rev/ec/v30n3.515
Enseñanza de las ciencias, Vol. 30, Núm. 3 (novembre 2012) , p. 295-317  
Detailed record - Creative Commons
33.
5 p, 154.8 KB La semipresencialidad vista por los estudiantes de un curso de óptica / Bohigas i Janoher, Xavier (Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear) ; Novell, Montse (Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear) ; Jaén, Xavier (Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear)
2005
Enseñanza de las ciencias, Núm. Extra (2005) , p. 1-5  
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