Optical signal dependent noise reduction by variable spatial thresholding of the fourier transform
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United States of America Patent
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Aug 9, 1994
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N/A
app pub date -
Jul 29, 1992
filing date -
Jul 29, 1992
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Expired
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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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