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Adaptive non-uniformity compensation algorithm

  • US 5,903,659 A
  • Filed: 04/17/1997
  • Issued: 05/11/1999
  • Est. Priority Date: 04/17/1997
  • Status: Expired due to Term
First Claim
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1. An adaptive method for removing fixed pattern noise from focal plane array (FPA) imagery, comprising the following steps:

  • obtaining respective focused and blurred digitized versions of an FPA image;

    applying a set of correction terms to the focused version of said FPA image to provide a corrected, focused FPA image;

    applying a filter to the corrected, focused version of said FPA image to obtain a filter focus image;

    applying said set of correction terms to said blurred version of the FPA image to provide a corrected, blurred version of said FPA image;

    applying said filter to the corrected, blurred image to provide a filter blur image;

    calculating fixed pattern noise errors using the filter focus image and the filter blur image; and

    employing said fixed pattern noise errors to update the correction terms for use in processing a next FPA image.

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