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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 21 — Oct. 10, 2011
  • pp: 21091–21097

Optical processing of color images with incoherent illumination: orientation-selective edge enhancement using a modified liquid-crystal display

Ariel Fernández, Julia R. Alonso, Jorge L. Flores, Gastón A. Ayubi, J. Matías Di Martino, and José A. Ferrari  »View Author Affiliations

Optics Express, Vol. 19, Issue 21, pp. 21091-21097 (2011)

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We present a novel optical method for edge enhancement in color images based on the polarization properties of liquid-crystal displays (LCD). In principle, a LCD generates simultaneously two color-complementary, orthogonally polarized replicas of the digital image used as input. The currently viewed image in standard LCD monitors and cell phone’s screens -which we will refer as the “positive image or true-color image”- is the one obtained by placing an analyzer in front of the LCD, in cross configuration to the back polarizer of the display. The orthogonally polarized replica of this image –the “negative image or complementary-color image”- is absorbed by the front polarizer. In order to generate the positive and negative replica with a slight displacement between them, we used a LCD monitor whose analyzer (originally a linear polarizer) was replaced by a calcite crystal acting as beam displacer. When both images are superimposed laterally displaced across the image plane, one obtains an image with enhanced first-order derivatives along a specific direction. The proposed technique works under incoherent illumination and does not require precise alignment, and thus, it could be potentially useful for processing large color images in real-time applications. Validation experiments are presented.

© 2011 OSA

OCIS Codes
(100.1160) Image processing : Analog optical image processing
(100.2980) Image processing : Image enhancement

ToC Category:
Image Processing

Original Manuscript: August 17, 2011
Revised Manuscript: September 21, 2011
Manuscript Accepted: September 22, 2011
Published: October 7, 2011

Ariel Fernández, Julia R. Alonso, Jorge L. Flores, Gastón A. Ayubi, J. Matías Di Martino, and José A. Ferrari, "Optical processing of color images with incoherent illumination: orientation-selective edge enhancement using a modified liquid-crystal display," Opt. Express 19, 21091-21097 (2011)

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