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Bifurcative optical pattern recognition

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Abstract

A new bifurcative optical pattern recognizer (BOPAR) for image and/or data classification using the noise fan-out phenomenon in nonlinear photorefractive crystals is described. The inhomogeneities in photorefractive crystals naturally exits consequential to the doping procedure in making the crystals photorefractive. Scattering occurs when light impinges on the inhomogeneities. The scattered light is in general random in intensity distribution and angular orientation. Therefore such scattered light is considered as annoying noise that tends to reduce the strength of the signal. In this paper, a new and exciting discovery is reported. Contrary to the conventional conviction, we found that certain portions of the fan-out noise can be made useful for achieving bifurcative optical holographic pattern recognition and data classification. The BOPAR has a neuromorphic or brainlike nature.

© 1991 Optical Society of America

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