Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1997-12-12
1999-10-05
Spyrou, Cassandra
Optical: systems and elements
Holographic system or element
Having particular recording medium
359 7, 359 10, 359 11, 465122, 465125, G03H 102, G03H 110, G03H 112, G11C 1304
Patent
active
059633468
ABSTRACT:
A method and an apparatus for increasing detection signal-to-noise ratio of a holographic image by compensating for noise characteristics of a holographic storage medium are disclosed. The method comprises the following steps: (a) inputting a first input image into the holographic storage medium; (b) storing the first input image in the holographic storage medium; (c) reading out the stored first input image from the holographic storage medium as a first output image; (d) recording the first output image on an output recording device, the first output image deviating from the first input image due to noise characteristics of the holographic storage medium; (e) comparing the first output image to the first input image to derive relative phase shift data; (f) inputting a second input image into the holographic storage medium, the second input image being formed by modifying the first input image in response to the derived relative phase shift data; (g) storing the second input image in the storage medium such that the stored second input image is combined with the stored first input image to produce a stored combined image; and (h) reading out the stored combined image from the holographic storage medium as a second output image. The second output image is approximately identical to the desired output image which would be obtained in the absence of scatter noise.
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Anderson Terry J.
Chang Audrey
Hoch Jr. Karl J.
Northrop Grumman Corporation
Spyrou Cassandra
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