Fragile watermark for detecting printed image copies

Details Fragile watermark for detecting printed image copies Fragile watermark for detecting printed image copies

2003-11-24

2008-11-04

Coles, Edward L (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Communication

C358S001200, C358S001900, C382S103000, C382S232000

Reexamination Certificate

active

07446891

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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