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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 18 — Aug. 30, 2010
  • pp: 19163–19168

Analog image contouring using a twisted-nematic liquid-crystal display

Jorge L. Flores, José A. Ferrari, Javier A. Ramos, Julia R. Alonso, and Ariel Fernández  »View Author Affiliations

Optics Express, Vol. 18, Issue 18, pp. 19163-19168 (2010)

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We present a novel image contouring method based on the polarization features of the twisted-nematic liquid-crystal displays (TN-LCDs). TN-LCDs are manufactured to work between a crossed polarizer-analyzer pair. When the analyzer is at 45 deg (instead of 90 deg) with respect to the polarizer, one obtains an optically processed image with pronounced outlines (dark contours) at middle intensity, i.e., the borders between illuminated and dark areas are enhanced. The proposed method is quite robust and does not require precise alignment or coherent illumination. Since it does not involve numerical processing, it could be useful for contouring large images in real-time, which presents potential applications in medical and biological imaging. Validation experiments are presented.

© 2010 OSA

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

ToC Category:
Image Processing

Original Manuscript: June 14, 2010
Revised Manuscript: August 20, 2010
Manuscript Accepted: August 22, 2010
Published: August 25, 2010

Virtual Issues
Vol. 5, Iss. 13 Virtual Journal for Biomedical Optics

Jorge L. Flores, José A. Ferrari, Javier A. Ramos, Julia R. Alonso, and Ariel Fernández, "Analog image contouring using a twisted-nematic liquid-crystal display," Opt. Express 18, 19163-19168 (2010)

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