Dr. Alejandro Velez Zea Profile

Dr. Alejandro Velez Zea

Assistant professor at Univ de Antioquia

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Publications (3)

SPIE Journal Paper | 27 January 2025

Ptychographic key retrieval in an experimental joint transform correlator cryptosystem

Carlos Andrés Vargas-Castrillón, Alejandro Velez Zea, John Fredy Barrera Ramírez

OE, Vol. 64, Issue 01, 018105, (January 2025) https://doi.org/10.1117/12.10.1117/1.OE.64.1.018105

KEYWORDS: Correlation coefficients, Windows, Fourier transforms, Optical engineering, Spatial light modulators, Joint transforms, Optical components, Digital holography, Phase shifting, Phase retrieval

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Proceedings Article | 19 September 2018 Paper

Experimental noise-free information recovery via reference beam encryption

John Alexis Jaramillo Osorio, John Fredy Barrera Ramírez, Santiago Montoya, Alejandro Mira-Agudelo, Alejandro Velez Zea, Roberto Torroba

Proceedings Volume 10721, 107212E (2018) https://doi.org/10.1117/12.2321349

KEYWORDS: Fourier transforms, Lanthanum, Computer security, Interferometry, Glasses, Diffusers, CMOS cameras, Spatial light modulators, Image quality, Free space optics

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Proceedings Article | 7 September 2018 Presentation + Paper

Optimized random phase only holograms in the Fresnel domain

Alejandro Velez Zea, John Fredy Barrera, Roberto Torroba

Proceedings Volume 10751, 1075105 (2018) https://doi.org/10.1117/12.2319842

KEYWORDS: Holograms, Spatial light modulators, Reconstruction algorithms, Detection and tracking algorithms, Lanthanum, Holography, Image resolution, Fourier transforms, Speckle, LCDs

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