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Proceedings Paper

Optical pattern recognition by using speckle-multiplexed holograms
Author(s): Byungchoon Yang; Hong-Seok Lee; Byoungho Lee
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Paper Abstract

Many researchers are now working on holographic memory. The holographic correlator is one of its different applications. The photorefractive hologram memory setup can be modified to be used as the correlator scheme. We can identify the object image by observing the direction of retrieved reference beams or correlation peaks. We have used a new scheme of using the speckle patterns as the reference beam. The speckle patterns can be made by multimode fibers or ground glasses. The hologram recorded with this speckled reference beam is less correlated with each other compared to the holograms with the unstructured reference beam. We have already proven that the hologram density could be increased with this speckled reference beam. We apply this technique to an optical correlator. The experimental result and the theoretical analysis are discussed.

Paper Details

Date Published: 20 September 1999
PDF: 8 pages
Proc. SPIE 3801, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications V, (20 September 1999); doi: 10.1117/12.363931
Show Author Affiliations
Byungchoon Yang, Seoul National Univ. (South Korea)
Hong-Seok Lee, Seoul National Univ. (South Korea)
Byoungho Lee, Seoul National Univ. (South Korea)


Published in SPIE Proceedings Vol. 3801:
Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications V
Francis T. S. Yu; Shizhuo Yin, Editor(s)

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