Artículo
Image enhancement by spatial frequency post-processing of images obtained with pupil filters
Estévez, Irene; Escalera, Juan C.; Pears Stefano, Quimey Martín
; Iemmi, Claudio César
; Ledesma, Silvia Adriana
; Yzuel, María J.; Campos, Juan
Fecha de publicación:
06/2016
Editorial:
Elsevier Science
Revista:
Optics Communications
ISSN:
0030-4018
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The use of apodizing or superresolving filters improves the performance of an optical system in different frequency bands. This improvement can be seen as an increase in the OTF value compared to the OTF for the clear aperture. In this paper we propose a method to enhance the contrast of an image in both its low and its high frequencies. The method is based on the generation of a synthetic Optical Transfer Function, by multiplexing the OTFs given by the use of different non-uniform transmission filters on the pupil. We propose to capture three images, one obtained with a clear pupil, one obtained with an apodizing filter that enhances the low frequencies and another one taken with a superresolving filter that improves the high frequencies. In the Fourier domain the three spectra are combined by using smoothed passband filters, and then the inverse transform is performed. We show that we can create an enhanced image better than the image obtained with the clear aperture. To evaluate the performance of the method, bar tests (sinusoidal tests) with different frequency content are used. The results show that a contrast improvement in the high and low frequencies is obtained.
Palabras clave:
Apodization
,
Diffraction
,
Image Enhancement
,
Resolution
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Articulos(OCA CIUDAD UNIVERSITARIA)
Articulos de OFICINA DE COORDINACION ADMINISTRATIVA CIUDAD UNIVERSITARIA
Articulos de OFICINA DE COORDINACION ADMINISTRATIVA CIUDAD UNIVERSITARIA
Citación
Estévez, Irene; Escalera, Juan C.; Pears Stefano, Quimey Martín; Iemmi, Claudio César; Ledesma, Silvia Adriana; et al.; Image enhancement by spatial frequency post-processing of images obtained with pupil filters; Elsevier Science; Optics Communications; 380; 6-2016; 21-27
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