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20 September 1999 Optical pattern recognition by using speckle-multiplexed holograms
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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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Byungchoon Yang, Hong-Seok Lee, and Byoungho Lee "Optical pattern recognition by using speckle-multiplexed holograms", Proc. SPIE 3801, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications V, (20 September 1999); https://doi.org/10.1117/12.363931
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