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Estévez, I.; Escalera, J.C.; Stefano, Q.P.; Iemmi, C.; Ledesma, S.; Yzuel, M.J.; Campos, J. "Image enhancement by spatial frequency post-processing of images obtained with pupil filters" (2016) Optics Communications. 380:21-27
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Abstract:

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. © 2016

Registro:

Documento: Artículo
Título:Image enhancement by spatial frequency post-processing of images obtained with pupil filters
Autor:Estévez, I.; Escalera, J.C.; Stefano, Q.P.; Iemmi, C.; Ledesma, S.; Yzuel, M.J.; Campos, J.
Filiación:Departamento de Física, Universidad Autónoma de Barcelona, Bellaterra, 08193, Spain
Departamento de Física, FCEyN, Universidad de Buenos Aires, Buenos Aires, 1428, Argentina
Palabras clave:Apodization; Diffraction; Image enhancement; Resolution; Diffraction; Frequency bands; Image enhancement; Inverse problems; Inverse transforms; Optical resolving power; Optical systems; Optical transfer function; Apodizations; Apodizing filters; Contrast improvements; Different frequency; High frequency HF; Pass-band filters; Spatial frequency; Transmission filters; Bandpass filters
Año:2016
Volumen:380
Página de inicio:21
Página de fin:27
DOI: http://dx.doi.org/10.1016/j.optcom.2016.05.076
Título revista:Optics Communications
Título revista abreviado:Opt Commun
ISSN:00304018
CODEN:OPCOB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00304018_v380_n_p21_Estevez

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Citas:

---------- APA ----------
Estévez, I., Escalera, J.C., Stefano, Q.P., Iemmi, C., Ledesma, S., Yzuel, M.J. & Campos, J. (2016) . Image enhancement by spatial frequency post-processing of images obtained with pupil filters. Optics Communications, 380, 21-27.
http://dx.doi.org/10.1016/j.optcom.2016.05.076
---------- CHICAGO ----------
Estévez, I., Escalera, J.C., Stefano, Q.P., Iemmi, C., Ledesma, S., Yzuel, M.J., et al. "Image enhancement by spatial frequency post-processing of images obtained with pupil filters" . Optics Communications 380 (2016) : 21-27.
http://dx.doi.org/10.1016/j.optcom.2016.05.076
---------- MLA ----------
Estévez, I., Escalera, J.C., Stefano, Q.P., Iemmi, C., Ledesma, S., Yzuel, M.J., et al. "Image enhancement by spatial frequency post-processing of images obtained with pupil filters" . Optics Communications, vol. 380, 2016, pp. 21-27.
http://dx.doi.org/10.1016/j.optcom.2016.05.076
---------- VANCOUVER ----------
Estévez, I., Escalera, J.C., Stefano, Q.P., Iemmi, C., Ledesma, S., Yzuel, M.J., et al. Image enhancement by spatial frequency post-processing of images obtained with pupil filters. Opt Commun. 2016;380:21-27.
http://dx.doi.org/10.1016/j.optcom.2016.05.076