Dr. Javier Portilla Profile

Dr. Javier Portilla

at Instituto de Óptica "Daza de Valdés"

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Author

Publications (9)

Proceedings Article | 28 May 2018 Paper

Hybrid digital-optical imaging design for reducing surface asphericity cost while keeping high performance

Javier Portilla, Sergio Barbero

Proceedings Volume 10694, 1069406 (2018) https://doi.org/10.1117/12.2312660

KEYWORDS: Sensors, Signal to noise ratio, Image quality, Aspheric lenses, Point spread functions, Image sensors, Optical design, Monochromatic aberrations, Optics manufacturing, Aspheric optics

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Proceedings Article | 18 December 2012 Paper

Accuracy of geometric point spread function estimation using the ray-counting method

Javier Portilla, Sergio Barbero

Proceedings Volume 8550, 855003 (2012) https://doi.org/10.1117/12.981183

KEYWORDS: Point spread functions, Ray tracing, Signal to noise ratio, Sensors, Error analysis, Neptunium, Geometrical optics, Spatial resolution, Spherical lenses, Numerical integration

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Proceedings Article | 8 October 2007 Paper

Low-cost wavefront coding using coma and a denoising-based deconvolution

Carlos Dorronsoro, Jose Guerrero-Colon, Marta de la Fuente, Jose Infante, Javier Portilla

Proceedings Volume 6737, 67370E (2007) https://doi.org/10.1117/12.738279

KEYWORDS: Point spread functions, Infrared imaging, Image quality, Sensors, Infrared cameras, Monochromatic aberrations, Cameras, Image restoration, Deconvolution, Wavefronts

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Proceedings Article | 20 September 2007 Paper

L0-based sparse approximation: two alternative methods and some applications

Javier Portilla, Luis Mancera

Proceedings Volume 6701, 67011Z (2007) https://doi.org/10.1117/12.736231

KEYWORDS: Image processing, Image restoration, Tolerancing, Annealing, Error analysis, Associative arrays, Chemical elements, Signal to noise ratio, Iterative methods, Optimization (mathematics)

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Proceedings Article | 20 September 2007 Paper

Image restoration using adaptive Gaussian scale mixtures in overcomplete pyramids

Javier Portilla, Jose Guerrero-Colon

Proceedings Volume 6701, 67011F (2007) https://doi.org/10.1117/12.734572

KEYWORDS: Denoising, Global system for mobile communications, Image restoration, Statistical analysis, Signal to noise ratio, Matrices, Point spread functions, Image filtering, Visualization, Image processing

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Proceedings Article | 17 July 1998 Paper

Duality between foveatization and multiscale local spectrum estimation

Rafael Fonolla Navarro, Javier Portilla, Antonio Tabernero

Proceedings Volume 3299, (1998) https://doi.org/10.1117/12.320121

KEYWORDS: Optical filters, Linear filtering, Image filtering, Fourier transforms, Electronic filtering, Prototyping, Biological research, Visual system, Visualization, Mirrors

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SPIE Journal Paper | 1 January 1998

Efficient spatial-domain implementation of a multiscale image representation based on Gabor functions

Oscar Nestares, Rafael Fonolla Navarro, Javier Portilla, Antonio Tabernero

JEI, Vol. 7, Issue 01, (January 1998) https://doi.org/10.1117/12.10.1117/1.482638

KEYWORDS: Image filtering, Linear filtering, Signal to noise ratio, VHF band, Convolution, Wavelet transforms, Image compression, Visualization, Image enhancement, Wavelets

SPIE Journal Paper | 1 August 1996

Texture synthesis-by-analysis method based on a multiscale early-vision model

Javier Portilla, Rafael Fonolla Navarro, Oscar Nestares, Antonio Tabernero

OE, Vol. 35, Issue 08, (August 1996) https://doi.org/10.1117/12.10.1117/1.600814

KEYWORDS: Visualization, Autoregressive models, Visual process modeling, Interference (communication), Image filtering, Gaussian filters, Electronic filtering, Optical engineering, Optical filters, Modulation

Proceedings Article | 22 April 1996 Paper

Robust method for texture synthesis-by-analysis based on a multiscale Gabor scheme

Rafael Fonolla Navarro, Javier Portilla

Proceedings Volume 2657, (1996) https://doi.org/10.1117/12.238704

KEYWORDS: Autoregressive models, Visualization, Optical filters, Visual process modeling, Linear filtering, Image filtering, Statistical modeling, Interference (communication), Electronic filtering, Image compression

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Showing 5 of 9 publications

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