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UAB Digital Repository of Documents 81 records found  beginprevious52 - 61nextend  jump to record: Search took 0.01 seconds. 
52.
3 p, 508.0 KB Achromatic diffractive lens written onto a liquid crystal display / Márquez Ruiz, Andrés (Universitat d'Alacant. Departament de Física, Enginyeria de Sistemes i Teoria de la Senyal) ; Iemmi, Claudio (Universidad de Buenos Aires. Departamento de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
We propose a programmable diffractive lens written onto a liquid crystal display (LCD) that is able to provide equal focal lengths for several wavelengths simultaneously. To achieve this goal it is necessary that the LCD operate in the phase-only regime simultaneously for the different wavelengths. [...]
2006 - 10.1364/OL.31.000392
Optics letters, Vol. 31, No. 3 (1 February 2006) , p. 392-394  
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53.
3 p, 93.3 KB Integration in the Fourier domain for restoration of a function from its slope : comparison of four methods / Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Yaroslavsky, Leonid P. (Tel Aviv University. Department of Interdisciplinary Studies) ; Moreno Soriano, Alfonso (Universitat Autònoma de Barcelona. Departament de Física) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
In some measurement techniques the profile, f(x), of a function should be obtained from the data on measured slope f'(x) by integration. The slope is measured in a given set of points, and from these data we should obtain the profile with the highest possible accuracy. [...]
2002 - 10.1364/OL.27.001986
Optics letters, Vol. 27, No. 22 (15 November 2002) , p. 1986-1988  
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54.
3 p, 290.0 KB Evaluation and correction of aberrations in an optical correlator by phase-shifting interferometry / Iemmi, Claudio (Universidad de Buenos Aires. Departamento de Física) ; Moreno Soriano, Alfonso (Universitat Autònoma de Barcelona. Departament de Física) ; Nicolás, Josep (Universitat Autònoma de Barcelona. Departament de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física)
We propose a new method for evaluating and correcting aberrations in a Vander Lugt correlator. The technique is achieved with liquid-crystal displays of the correlator and allows the task to be performed in situ. [...]
2003 - 10.1364/OL.28.001117
Optics letters, Vol. 28, No. 13 (1 July 2003) , p. 1117-1119  
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55.
3 p, 453.7 KB Simple expressions for performance parameters of complex filters, with applications to super-Gaussian phase filters / Ledesma, Silvia (Universidad de Buenos Aires. Departamento de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Escalera Merino, Juan Carlos (Universitat Autònoma de Barcelona. Departament de Física) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
To study the three-dimensional (3-D) behavior produced by complex filters, we have extended the expressions for the axial and the transverse gain to the case in which the best image plane is not near the paraxial focus. [...]
2004 - 10.1364/OL.29.000932
Optics letters, Vol. 29, No. 9 (1 May 2004) , p. 932-934  
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56.
3 p, 523.4 KB Programmable axial apodizing and hyperresolving amplitude filters with a liquid-crystal spatial light modulator / Davis, Jeffrey A. (San Diego State University. Department of Physics) ; Escalera Merino, Juan Carlos (Universitat Autònoma de Barcelona. Departament de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Márquez Ruiz, Andrés (Universitat Autònoma de Barcelona. Departament de Física) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física) ; Iemmi, Claudio (Universidad de Buenos Aires. Departamento de Física)
Amplitude-transmitting filters for apodizing and hyperresolving applications can be easily implemented by use of a two-dimensional programmable liquid-crystal spatial light modulator operating in a transmission-only mode. [...]
1999 - 10.1364/OL.24.000628
Optics letters, Vol. 24, No. 9 (1 May 1999) , p. 628-630  
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57.
3 p, 481.8 KB Input-image homogenization as a method to improve a correlator's discrimination capability / Yaroslavsky, Leonid P. (Tel Aviv University. Department of Interdisciplinary Studies) ; López Coronado, Octavio (Universitat Autònoma de Barcelona. Departament de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física)
We propose an input-image preprocessing method consisting of homogenization of the image to improve the discrimination capability of a correlation-based recognition process. This method is an approximation of the optimal filter. [...]
1998 - 10.1364/OL.23.001129
Optics letters, Vol. 23, No. 14 (15 July 1998) , p. 1129-1131  
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58.
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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59.
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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60.
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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61.
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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