The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 1999
Filed:
Dec. 12, 1997
Eddy Alfons Stappaerts, San Ramon, CA (US);
Northrop Grumman Corporation, Los Angeles, CA (US);
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.