Pattern Recognition via Complex Spatial Filtering

Almeida, Silverio P.; Indebetouw, Guy

doi:10.1016/b978-0-12-663220-0.50009-7

Cited by 9 publications

(4 citation statements)

References 188 publications

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“…A coherent plane-parallel laser beam of uniform intensity and zero phase illuminates an etched LR-115 detector with a complex amplitude transmittance g 1 = (x 1 , y 1 ) placed in the front focal plane of lens L 1 , as is shown in figure 1. The bi-dimensional Fourier transform G 1 (u, v) of the object at O by L 1 has an amplitude distribution in the back focal plane of L 1 at P f expressed by Almeida and Indebetouw [25] as…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Track analysis of laser-illuminated etched track detectors using an opto-digital imaging system

Eghan

Buah-Bassuah

Oppon

2007

Meas. Sci. Technol.

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An opto-digital imaging system for counting and analysing tracks on a LR-115 detector is described. One batch of LR-115 track detectors was irradiated with Am-241 for a determined period and distance for linearity test and another batch was exposed to radon gas. The laser-illuminated etched track detector area was imaged, digitized and analysed by the system. The tracks that were counted on the opto-digital system with the aid of media cybernetics software as well as spark gap counter showed comparable track density results ranging between 1500 and 2750 tracks cm−2 and 65 tracks cm−2 in the two different batch detector samples with 0.5% and 1% track counts, respectively. Track sizes of the incident alpha particles from the radon gas on the LR-115 detector demonstrating different track energies are statistically and graphically represented. The opto-digital imaging system counts and measures other track parameters at an average process time of 3–5 s.

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Section: Theoretical Backgroundmentioning

confidence: 99%

“…L 1 performs linear space invariant transformation. The second lens L 2 of the processor performs inverse Fourier transform projecting the processed image onto the CCD camera with an amplitude distribution in the output plane (g 2 (x 2 , y 2 )) given by Almeida and Indebetouw [25] as…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Track analysis of laser-illuminated etched track detectors using an opto-digital imaging system

Eghan

Buah-Bassuah

Oppon

2007

Meas. Sci. Technol.

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“…For computer-interfaced monitoring systems (e.g., Cairns et al, 1977b;Cairns and Gruber, 1980), establishing response variability even for individual organisms is relatively easy (Gruber and Cairns, 1981). Robust statistical analysis can document variability at different periods of the day or other cyclic variations and chemical/physical attributes measured simultaneously and amenable to computer interfacing Almeida et al, 1978). However, extrapolations from one level of biological organization to higher levels in biological monitoring and other assessment systems should be viewed with extreme caution.…”

Section: False Negatives and False Positivesmentioning

confidence: 99%

The biospheric life support system: a unifying concept for ecotoxicologists and ecologists

Cairns

2009

Integr Envir Assess & Manag

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“…Se concluye que al sistema se le adiciona un grado de seguridad al introducir el parámetro de la secuencia de filtrado. El número total de combinaciones posibles para formar una secuencia dinámica de 10 imágenes a partir del plano de filtrado de 30 parejas de órdenes difractados es del orden de ~1x10 14 , un número relativamente importante. Si se tiene en cuenta el orden de las 30 imágenes en una única secuencia, existen ~2.65x10 32 formas de organizar la escena dinámica.…”

Section: Discusión De Resultadosunclassified

Optimización de técnicas ópticas de seguridad

Solano¹,

Fabián²

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La presente tesis se enmarca en el ámbito de la óptica virtual.Como objetivo general, se busca optimizar los procesos involucrados en la transmisión de datos codificados en un canal de información clásico. Esto se refiere al proceso de encriptación aplicado a la información enviada, al proceso de desencriptación aplicado a la información codificada recibida y al proceso de transmisión de datos codificados por un canal de comunicación. Para cumplir esta tarea, el desarrollo de sistemas ópticos virtuales de encriptación permitirá “experimentar” y generar variaciones optimizadas de las técnicas conocidas de seguridad óptica. Esto conduce a la implementación digital de sistemas ópticos analógicos y asegurar su buen funcionamiento ejecutando los procesos concernientes a la validación de los modelos matemáticos computacionales [1.25]. Esto último implica verificar los resultados arrojados por el sistema óptico virtual comparando con resultados de algunas experiencias analógicas conocidas. Se espera de manera general que los resultados obtenidos aporten significativamente al área de la encriptación óptica perfeccionando la operatividad de los procesos ópticos aplicados en la protección de los datos.

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Pattern Recognition via Complex Spatial Filtering

Cited by 9 publications

References 188 publications

Track analysis of laser-illuminated etched track detectors using an opto-digital imaging system

Track analysis of laser-illuminated etched track detectors using an opto-digital imaging system

The biospheric life support system: a unifying concept for ecotoxicologists and ecologists

Optimización de técnicas ópticas de seguridad

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