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Proceedings Paper

Composed filter for attenuating bi-frequential noise on LCD-generated ronchigrams
Author(s): Miguel Mora-González; Roger Chiu-Zarate; Jesús Muñoz-Maciel; Julio C. Martinez-Romo; Javier Salinas-Luna; Juan Campos Colma; Francisco J. Luna-Rosas
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Paper Abstract

This work aims to design a filter to attenuate high- and medium- frequency noise in optical test images without changing the edges and original characteristics of the test image, generated by traditional filters (spatial or frequential). The noise produced by the LCD pixels (used as a diffraction grating in the Ronchi test) was analyzed. The diffraction is modulated by the spherical wavefront of the mirror under test, generating at least two frequency band noise levels. To reduce this bi-frequential noise, we propose to use an array of filters with the following structure: a low-pass frequential filter LPFF, a band- pass frequential filter BPFF and a circular mask spatial filter CMSF; thus obtaining the composed filter CF=LPFF-(BPFF)(CMSF). Various sizes of filters were used to compare their signal-to-noise ratio against simple filters (low-pass and band-stop).

Paper Details

Date Published: 30 April 2012
PDF: 6 pages
Proc. SPIE 8436, Optics, Photonics, and Digital Technologies for Multimedia Applications II, 84360K (30 April 2012); doi: 10.1117/12.922141
Show Author Affiliations
Miguel Mora-González, Univ. de Guadalajara (Mexico)
Roger Chiu-Zarate, Univ. de Guadalajara (Mexico)
Jesús Muñoz-Maciel, Univ. de Guadalajara (Mexico)
Julio C. Martinez-Romo, Instituto Tecnológico de Aguascalientes (Mexico)
Javier Salinas-Luna, Univ. del Mar (Mexico)
Juan Campos Colma, Univ. Autònoma de Barcelona (Spain)
Francisco J. Luna-Rosas, Instituto Tecnológico de Aguascalientes (Mexico)

Published in SPIE Proceedings Vol. 8436:
Optics, Photonics, and Digital Technologies for Multimedia Applications II
Peter Schelkens; Touradj Ebrahimi; Gabriel Cristóbal; Frédéric Truchetet; Pasi Saarikko, Editor(s)

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