Zobrazeno 1 - 10
of 39
pro vyhledávání: '"John Fredy Barrera Ramírez"'
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-15 (2023)
Abstract This study demonstrates a full-color near-eye holographic display capable of superimposing color virtual scenes with 2D, 3D, and multiple objects with extended depth upon a real scene, which also has the ability to present different 3D infor
Externí odkaz:
https://doaj.org/article/c9a44eab68e84f2a832adac6fca9ded1
Autor:
John Fredy Barrera-Ramírez
Publikováno v:
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales, Vol 46, Iss 178 (2022)
En esta contribución se discuten los avances más significativos en el campo de la encriptación de información mediante procesamiento óptico con énfasis en los adelantos en la reducción y la eliminación del ruido. Se hace la descripción teór
Externí odkaz:
https://doaj.org/article/5694e44ba29543f39f7ba1bfbeb0ac7b
Publikováno v:
Dyna, Vol 84, Iss 201, Pp 234-240 (2017)
En este trabajo se presentan los resultados de la transmisión de información por una red de fibra óptica convencional de bajo costo. La información a transmitir se almacena en un código de respuesta rápida (código QR) y se analizan los efectos
Externí odkaz:
https://doaj.org/article/1ba59af09f9240159b8ceb5f84c2e88c
Autor:
Walter Torres-Sepúlveda, Alejandro Mira-Agudelo, John Fredy Barrera-Ramírez, Andrzej Kolodziejczyk
Publikováno v:
Journal of the Optical Society of America A. 40:C138
We propose, implement, and validate a new objective method for predicting the trends of visual acuity through-focus curves provided by specific optical elements. The proposed method utilized imaging of sinusoidal gratings provided by the optical elem
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f8f499df8d817ee101af29bf2dfee057
https://doi.org/10.1364/josaa.478022
https://doi.org/10.1364/josaa.478022
Publikováno v:
Applied optics. 61(11)
We demonstrate the generation of phase holograms of multiple 3D objects at different axial positions without cross talk and significant improvements in performance over conventional methods. We first obtain the phase hologram of two 3D objects, each
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74f180c02f031c8b4302786bc5fe6dc7
https://pubmed.ncbi.nlm.nih.gov/35471307
https://pubmed.ncbi.nlm.nih.gov/35471307
Publikováno v:
Imaging and Applied Optics Congress 2022 (3D, AOA, COSI, ISA, pcAOP).
We demonstrate the generation of phase holograms of multiple overlapping 3D objects at different axial positions without crosstalk. We introduce a singular value decomposition approach, leading to significant improvements in performance over conventi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0a93ec5240b8d13a22a19121a3b887b6
https://doi.org/10.1364/3d.2022.jw2a.2
https://doi.org/10.1364/3d.2022.jw2a.2
Publikováno v:
Optics Letters. 48:672
In this Letter, we propose an opto-digital cryptosystem based on the joint transform correlator architecture without the need for a reference beam, phase-shifting techniques, or an additional window in the input plane. In this system, only two intens
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::18fcdb25639c41dfd004f6ea3540ebbf
https://doi.org/10.1364/ol.478132
https://doi.org/10.1364/ol.478132
Autor:
José J. Suárez-Vargas, Dorota Korte, Humberto Cabrera, Joseph Niemela, John Fredy Barrera Ramírez, Evelio E. Ramírez-Miquet
Publikováno v:
IEEE Sensors Journal. 19:2547-2552
We report on a novel pump-probe photothermal system based on the self-mixing effect. Experimental observations using a single mode laser show that the photothermal lens distorts the self-mixing beam propagation, thus modulating the light re-injected
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d3fe36b5b1423b7253fb75c03960e2f9
https://doi.org/10.1109/jsen.2018.2889600
https://doi.org/10.1109/jsen.2018.2889600
Autor:
Alejandro Velez-Zea, Roberto Torroba, John Fredy Barrera-Ramírez, Santiago Bustamante Quinchia
Publikováno v:
OSA Imaging and Applied Optics Congress 2021 (3D, COSI, DH, ISA, pcAOP).
We demonstrate how the use of optimized random phases enables the fast computation of binary amplitude holograms via thresholding. We obtain similar performance compared to the Gerchberg-Saxton algorithm with a significant speed advantage.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0cd02a0813d867b85bdc68924cb194a2
https://doi.org/10.1364/dh.2021.dtu7b.5
https://doi.org/10.1364/dh.2021.dtu7b.5
Publikováno v:
OSA Imaging and Applied Optics Congress 2021 (3D, COSI, DH, ISA, pcAOP).
We introduce a modified hologram plane constraint to the global Gerchberg-Saxton algorithm for improved multiplane phase-only hologram generation. We demonstrate a 17% increase in the reconstruction quality compared with previously reported methods.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5e64a1e6c2e81b178a580cfc91939eb4
https://doi.org/10.1364/dh.2021.dth7c.4
https://doi.org/10.1364/dh.2021.dth7c.4