Optical signal dependent noise reduction by variable spatial thr

Details Optical signal dependent noise reduction by variable spatial thr Optical signal dependent noise reduction by variable spatial thr

1992-07-29

1994-08-09

Moskowitz, Nelson

Optical: systems and elements

Diffraction

From grating

359299, 359559, G02B 2746, G02B 523

Patent

active

053371801

ABSTRACT:
Spatially variable nonlinear optical thresholding in the Fourier plane reduces signal-dependent noise, such as scalar multiplicative noise. Coherent artifact noise reduction by a factor of four is attained using deamplifying photorefractive two-beam coupling. A variable light transmittance threshold across a spatially thresholded light modulating element such as a photorefractive crystal is utilized for this purpose.

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patent: 4974920 (1990-12-01), Chovan et al.
patent: 5072314 (1991-12-01), Chang
Khoury et al.; Jul. 29, 1991 OSA Photonic Science Topical Mtg. Series, vol. 14, AD-A253001, pp. 182-185; Abst. only provided.
Khoury et al.; Opt. Lett., vol. 16, #10, pp. 749-799, May 15, 1991; Abst. only provided.
Khoury et al.; Opt. Commun., vol. 82, No. 5-6, pp. 533-538, May 1, 1991; abst. only supplied.
Li et al.; Opt. Commun. vol. 76, #1, pp. 13-20, Apr. 1, 1990; abst. only supplied.

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