Dr. Elisabet Pérez Cabré Profile

Dr. Elisabet Pérez Cabré

at Univ Politècnica de Catalunya

SPIE Involvement:

Senior Members Committee | Author

Websites:

Company Website

Publications (29)

Proceedings Article | 30 June 2022 Open Access

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

Elisabet Pérez Cabré, Maria Millan, Jesus Cebrian Armengol

Proceedings Volume 12297, 122970V (2022) https://doi.org/10.1117/12.2635532

KEYWORDS: Photonics, Biomedical optics, Visualization, Visibility, Eye, Education and training, Astronomical imaging, Aerospace engineering, Video, Scientific programming

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Proceedings Article | 22 August 2017 Paper

Nonlinear joint transform correlator architectures for images encryption, decryption and authentication systems

Juan Vilardy, María Millán, Elisabet Pérez-Cabré

Proceedings Volume 10453, 1045336 (2017) https://doi.org/10.1117/12.2276425

KEYWORDS: Image encryption, Complex systems, Computer security, Joint transforms, Optical correlators, Gyrators, Fourier optics, Signal processing, Image processing, Image quality

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Proceedings Article | 22 August 2017 Paper

Influence of a perturbation in the Gyrator domain for a joint transform correlator-based encryption system

Juan Vilardy, María Millán, Elisabet Pérez-Cabré

Proceedings Volume 10453, 1045329 (2017) https://doi.org/10.1117/12.2275947

KEYWORDS: Image encryption, Gyrators, Joint transforms, Optical correlators, Computer programming, Computer security, Imaging systems, Numerical simulations

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SPIE Journal Paper | 2 February 2016 Open Access

Blinking supervision in a working environment

Bernardo Morcego, Marc Argilés, Marc Cabrerizo, Genís Cardona, Ramon Pérez, Elisabet Pérez Cabré, Joan Gispets

JBO, Vol. 21, Issue 02, 025005, (February 2016) https://doi.org/10.1117/12.10.1117/1.JBO.21.2.025005

KEYWORDS: Cameras, Eye, Detection and tracking algorithms, Iris recognition, Image processing, Video, Algorithm development, Image processing algorithms and systems, Image segmentation, Visualization

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SPIE Journal Paper | 18 March 2014

Programmable diffractive lens for ophthalmic application

Maria Millan, Elisabet Perez-Cabre, Lenny Romero, Natalia Ramirez

OE, Vol. 53, Issue 06, 061709, (March 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.6.061709

KEYWORDS: Eye, Spatial light modulators, Monochromatic aberrations, Modulation transfer functions, Image sensors, CCD image sensors, Liquid crystal on silicon, Visualization, Image quality, Modulators

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Proceedings Article | 18 November 2013 Paper

Ophthalmic compensation of visual ametropia based on a programmable diffractive lens

Maria Millán, Elisabet Pérez-Cabré, Lenny Romero, Natalia Ramírez

Proceedings Volume 8785, 8785CO (2013) https://doi.org/10.1117/12.2025472

KEYWORDS: Eye, Spatial light modulators, CCD image sensors, Liquid crystal on silicon, Image sensors, Visualization, Phase shift keying, Modulation transfer functions, Phase modulation, Geometrical optics

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Proceedings Article | 18 November 2013 Paper

Static and dynamic amplitude modulation of light in a twisted nematic liquid crystal display

Juan Vilardy, María Millán, Elisabet Pérez-Cabré

Proceedings Volume 8785, 87853O (2013) https://doi.org/10.1117/12.2020913

KEYWORDS: Spatial light modulators, Ronchi rulings, LCDs, Amplitude modulation, Modulation, Polarization, Molecules, Liquid crystals, Polarizers, Crystals

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Proceedings Article | 18 November 2013 Paper

Joint transform correlator-based encryption system using the Fresnel transform and nonlinear filtering

Juan Vilardy, María Millán, Elisabet Pérez-Cabré

Proceedings Volume 8785, 87853J (2013) https://doi.org/10.1117/12.2020912

KEYWORDS: Image encryption, Complex systems, Computer security, Fractional fourier transform, Optical image encryption, Joint transforms, Image processing, Nonlinear optics, Image retrieval, Optical correlators

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Proceedings Article | 1 September 2009 Paper

Improved design of optical ID tags for remote validation

S. Horrillo, E. Pérez-Cabré, M. Millán, B. Javidi

Proceedings Volume 7442, 74421D (2009) https://doi.org/10.1117/12.828649

KEYWORDS: Receivers, Imaging systems, Optical design, Surveillance, Tolerancing, Image processing, Optical imaging, Resistance, Binary data, Cameras

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Proceedings Article | 6 May 2008 Paper

Advances in LCoS SLM characterization for improved optical performance in image processing

Joaquin Otón, María Millán, Pierre Ambs, Elisabet Pérez-Cabré

Proceedings Volume 7000, 70001V (2008) https://doi.org/10.1117/12.783587

KEYWORDS: Spatial light modulators, Phase shift keying, Phase modulation, Liquid crystal on silicon, Calibration, Diffraction, Phase shifts, Wavefronts, Diffraction gratings, Liquid crystals

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Proceedings Article | 17 March 2008 Open Access

Optical ID tags for automatic vehicle identification and authentication

Bahram Javidi, Elisabet Pérez-Cabré, María Millán

Proceedings Volume 6977, 697702 (2008) https://doi.org/10.1117/12.785889

KEYWORDS: Near infrared, Computer security, Image encryption, Biometrics, Visible radiation, Cameras, Digital signal processing, Eye, Information security, Computer programming

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Proceedings Article | 24 September 2007 Paper

Optical resources for highly secure remote object authentication

María Millán, Elisabet Pérez-Cabré, Bahram Javidi

Proceedings Volume 6696, 66961P (2007) https://doi.org/10.1117/12.738338

KEYWORDS: Near infrared, Image encryption, Biometrics, Computer security, Optical correlators, Infrared signatures, Information security, Digital signal processing, Electronic filtering, Phase only filters

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Proceedings Article | 5 October 2006 Paper

High secure authentication by optical multifactor ID tags

María Millán, Elisabet Pérez-Cabré, Bahram Javidi

Proceedings Volume 6394, 63940J (2006) https://doi.org/10.1117/12.689886

KEYWORDS: Image encryption, Computer programming, Receivers, Biometrics, Signal processing, Computer security, Distortion, Image compression, Information security, Electronic filtering

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Proceedings Article | 29 September 2006 Open Access

Visible and NIR spectral band combination to produce high security ID tags for automatic identification

Elisabet Pérez-Cabré, María Millán, Bahram Javidi

Proceedings Volume 6394, 63940I (2006) https://doi.org/10.1117/12.689871

KEYWORDS: Near infrared, Visible radiation, Computer security, Infrared signatures, Information security, Image encryption, Homeland security, Receivers, Signal processing, Image processing

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Proceedings Article | 30 August 2006 Paper

Secure verification by multifactor optical validation

María Millán, Elisabet Pérez-Cabré, Bahram Javidi

Proceedings Volume 6311, 63110N (2006) https://doi.org/10.1117/12.680614

KEYWORDS: Image encryption, Signal processing, Biometrics, Computer programming, Electronic filtering, Retina, Computer security, Phase only filters, Image processing, Optical image encryption

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Proceedings Article | 27 October 2005 Open Access

Remote optical ID tag recognition and verification using fully spatial phase multiplexing

Elisabet Pérez-Cabré, María Millán, Bahram Javidi

Proceedings Volume 5986, 598602 (2005) https://doi.org/10.1117/12.630427

KEYWORDS: Image encryption, Computer programming, Receivers, Information security, Image restoration, Multiplexing, Computer security, Homeland security, Image quality, Image resolution

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Proceedings Article | 10 September 2005 Open Access

Remote object authentication using distortion-invariant ID tags

Elisabet Perez-Cabre, Maria Millan, Bahram Javidi

Proceedings Volume 5908, 59080N (2005) https://doi.org/10.1117/12.615006

KEYWORDS: Image encryption, Receivers, Computer security, Image compression, System identification, Active optics, Imaging systems, Optical correlators, Optics manufacturing, Signal processing

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Proceedings Article | 8 June 2005 Open Access

Detection and authentication of objects by using distortion-invariant optical ID tags

Elisabet Perez-Cabre, Bahram Javidi, Maria Millan

Proceedings Volume 5827, (2005) https://doi.org/10.1117/12.610224

KEYWORDS: Receivers, Computer security, Signal processing, Image encryption, System identification, Control systems, Active optics, Imaging systems, Optics manufacturing, Tolerancing

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Proceedings Article | 8 June 2005 Paper

Image analysis of contact lens grading scales for objective grade assignment of ocular complications

Elisabet Perez-Cabre, Maria Millan, Hector Abril, Edison Valencia

Proceedings Volume 5827, (2005) https://doi.org/10.1117/12.610226

KEYWORDS: Photography, Image segmentation, Image analysis, RGB color model, Objectives, Optical inspection, Feature extraction, Binary data, Digital image processing, Diamond

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Proceedings Article | 30 November 2004 Open Access

Distortion-invariant ID tags for object identification

Elisabet Perez-Cabre, Bahram Javidi

Proceedings Volume 5611, (2004) https://doi.org/10.1117/12.582093

KEYWORDS: Receivers, Active optics, Homeland security, Signal processing, Distortion, Computer security, Imaging systems, Image encryption, Computer programming, Optical correlators

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Proceedings Article | 21 October 2004 Paper

Image processing of standard grading scales for objective assessment of contact lens wear complications

Elisabet Perez-Cabre, Maria Millan, Hector Abril, E. Otxoa

Proceedings Volume 5622, (2004) https://doi.org/10.1117/12.590704

KEYWORDS: Photography, Image segmentation, Objectives, RGB color model, Image processing, Image analysis, Feature extraction, Optical inspection, Eye, Binary data

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Proceedings Article | 26 December 2001 Paper

Selective discrimination capability in optical pattern recognition using available SLMs

Elisabet Perez, Maria Millan Garcia-Verela, Katarzyna Chalasinska-Macukow, Jesus Garcia

Proceedings Volume 4435, (2001) https://doi.org/10.1117/12.451138

KEYWORDS: Spatial light modulators, Optical correlators, CCD cameras, Optical pattern recognition, Nonlinear filtering, Cameras, Binary data, Quantization, Modulators, Fourier transforms

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Proceedings Article | 30 November 2001 Paper

Pattern recognition with selective and adjustable discrimination

Maria Sagrario Millan Garcia-Verela, Elisabet Perez, Katarzyna Chalasinska-Macukow, Rafal Kotynski

Proceedings Volume 10302, 103020C (2001) https://doi.org/10.1117/12.449674

KEYWORDS: Pattern recognition, Tolerancing, Nonlinear dynamics, Complex systems, Joint transforms, Optical correlators, Control systems, Lead, Optoelectronics, Optical filters

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The discrimination capability requirements of pattern recognition systems may vary depending on the application and the characteristics of the objects to analyse. Our goal is to obtain a single system with a wide and smooth control of its discrimination capability in two senses: the first one, a discrimination capability selective to different aspects of the target (for example, shape, intensity, colour, texture); the second one, a discrimination capability with variable level of sensitivity -or tolerance- to the differences between an object and the target in the aspect selected. This purpose lead us to consider higher levels of complexity in the sensitivity of the recognition system. Thus, we obtain pattern recognition with high discrimination capability for a given aspect along with certain tolerance for another aspect, or vice versa. In this work, we build an optoelectronic system for pattern recognition with selective and adjustable discrimination capability by applying a dual nonlinear correlation model to a joint transform correlator. Dual nonlinear correlation is achieved by means of two nonlinear operators that are applied to both the reference and input channels. A filtering function that limits the region of support in the Fourier plane is additionally introduced. The eventual capabilities of the real system strongly depend on some experimental conditions such as quantization, grey-level dynamic range, saturation and other technical characteristics of both the camera and the spatial light modulator used in the joint transform correlator. We explore these capabilities for a 8-bits and a 12-bits CCD camera and several available modulators. Experimental and simulated results for model and real objects - alphabetic characters, keys and screws- are presented and discussed. They demonstrate that the discrimination capability of the optical recognition system by dual nonlinear correlation can be controlled and adjusted with gradable tolerance to object variations in a given aspect.

Proceedings Article | 13 November 2001 Open Access

Strategies for detection of distorted road signs in background noise

Elisabet Perez, Maria-Albertina Castro, Bahram Javidi

Proceedings Volume 4471, (2001) https://doi.org/10.1117/12.449327

KEYWORDS: Nonlinear filtering, Roads, Composites, Target recognition, Tolerancing, Complex systems, Target detection, Image classification, Scene classification, Detection and tracking algorithms

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Proceedings Article | 14 August 2001 Paper

Influence of SLM's technical characteristics on correlation results

Maria Millan Garcia-Verela, Elisabet Perez, Katarzyna Chalasinska-Macukow, Jesus Garcia

Proceedings Volume 4419, (2001) https://doi.org/10.1117/12.437197

KEYWORDS: Spatial light modulators, CCD cameras, Optical correlators, Modulators, Fourier transforms, Optical pattern recognition, Nonlinear dynamics, Complex systems, Laser optics, Binary data

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Proceedings Article | 19 July 1999 Paper

Polychromatic pattern recognition with variable discrimination capability

Elisabet Perez, Maria Millan Garcia-Verela, Katarzyna Chalasinska-Macukow

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354961

KEYWORDS: Tolerancing, RGB color model, Optical correlators, Pattern recognition, Target recognition, Optoelectronics, Joint transforms, Fourier transforms, Quantization, Optical pattern recognition

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Proceedings Article | 29 April 1999 Paper

Dual nonlinear correlation: optoelectronic realization and application to pattern recognition

Katarzyna Chalasinska-Macukow, Rafal Kotynski, Elisabet Perez, Maria Millan Garcia-Verela

Proceedings Volume 3729, (1999) https://doi.org/10.1117/12.346773

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Proceedings Article | 7 September 1998 Paper

Dual nonlinear correlation applied to textured and color object recognition

Elisabet Perez, Maria Millan Garcia-Verela, Katarzyna Chalasinska-Macukow

Proceedings Volume 3409, (1998) https://doi.org/10.1117/12.324130

KEYWORDS: Nonlinear filtering, Electronic filtering, Phase only filters, RGB color model, Tolerancing, CCD cameras, Optical filters, Pattern recognition, Nonlinear dynamics, Optical correlators

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Proceedings Article | 5 February 1996 Paper

Improvement of the color discrimination capability in optical pattern recognition

Maria Millan Garcia-Verela, Montserrat Corbalan-Fuertes, Elisabet Perez, Javier Romero, Maria Yzuel

Proceedings Volume 2730, (1996) https://doi.org/10.1117/12.231066

KEYWORDS: RGB color model, Optical pattern recognition, Visual process modeling, Optical filters, Human vision and color perception, Information operations, Image filtering, Data processing, Cameras, Image acquisition

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Showing 5 of 29 publications

Conference Committee Involvement (3)

Optics and Photonics for Information Processing II

13 August 2008 | San Diego, California, United States

Optics and Photonics for Information Processing

28 August 2007 | San Diego, California, United States

Optical Information Systems IV

16 August 2006 | San Diego, California, United States

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