Higher-order holographic associative memories and image processing

Peter V. Polyanskii; Christina V. Fel'de

doi:10.1117/12.455192

5 February 2002 Higher-order holographic associative memories and image processing

Peter V. Polyanskii, Christina V. Fel'de

Proceedings Volume 4607, Selected Papers from Fifth International Conference on Correlation Optics; (2002) https://doi.org/10.1117/12.455192
Event: Fifth International Conference on Correlation Optics, 2001, Chernivsti, Ukraine

Abstract

The problem of holographic associative memory and image processing is treated with account of the higher-order components of a thin hologram's amplitude transmittance and its higher diffraction orders. It is shown for the first time that a far-field nonlinear hologram of a diffraction aperture read out by the stored signal or its part provides full-image reconstructions (associative responses) in all observable diffraction orders. This result substantially develops so-called 'quadric holography approach' establishing that only error-corrected complex-conjugate associative response at the minus-second diffraction order of nonlinearly recorded thin hologram of a diffuse object can be reconstructed. Proceeding from the Young-Rubinowicz model of diffraction phenomena, it has been substantiated and proved experimentally that the higher-order associative responses turn out to be contoured being the higher-order reconstructions of the Young's edge diffraction wave. Besides, it is shown that a near-field nonlinear hologram from a half-tone input signal (without a diffuser) provides self-imaging of the stored memory in the form of its conjugate image with the inverted contrast.

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Peter V. Polyanskii and Christina V. Fel'de "Higher-order holographic associative memories and image processing", Proc. SPIE 4607, Selected Papers from Fifth International Conference on Correlation Optics, (5 February 2002); https://doi.org/10.1117/12.455192

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KEYWORDS

Holograms

Diffraction

3D image reconstruction

Holography

Nonlinear optics

Content addressable memory

Diffusers

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