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Proceedings Paper

Edge enhancement methods based on derivative operations
Author(s): Jorge L. Flores; José A. Ferrari
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Paper Abstract

Two methods are described for edge enhancement using optical derivative operations. The proposed methods are based on the polarization properties of the twisted-nematic liquid-crystal displays (LCDs). LCDs traduce the image information in changes of the state of polarization of the light, which allows us to generate simultaneously a "positive" and a "negative" (i.e., a contrast-reversed) replica of the digital image displayed on the LCD. In both methods negative and positive replicas are at the same time imagined across a plane. In first case when the negative replica has a lateral differential displacement relative to the original one, an image with enhanced first derivatives along a specific direction is obtained. In the case when the negative replica is low-pass filtered, one obtains the Laplacian of the original image. Unlike the usual Fourier (coherent) image processing, the technique proposed here works with incoherent illumination. Validation experiments are presented.

Paper Details

Date Published: 7 September 2010
PDF: 10 pages
Proc. SPIE 7797, Optics and Photonics for Information Processing IV, 779713 (7 September 2010); doi: 10.1117/12.860860
Show Author Affiliations
Jorge L. Flores, Univ. de Guadalajara (Mexico)
José A. Ferrari, Univ. de la República (Uruguay)


Published in SPIE Proceedings Vol. 7797:
Optics and Photonics for Information Processing IV
Abdul Ahad Sami Awwal; Khan M. Iftekharuddin; Scott C. Burkhart, Editor(s)

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