Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
November 4, 2008
Patent Application Number
10720664
Date Filed
November 24, 2003
Patent Primary Examiner
Patent abstract
The present invention is concerned with inclusion of a “fragile watermark” in an original printed document to aid in a determination whether a document under examination is an original or a copy. The watermark may be applied by making small tonal adjustments on a pixel block by pixel block basis in data used to generate the original document. Documents to be verified may then be examined on a block-by-block basis after scanning.
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