Watermark encoding and detection using narrow band illumination

Details Watermark encoding and detection using narrow band illumination Watermark encoding and detection using narrow band illumination

2008-12-05

2011-11-22

Rogers, Scott A (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003280, C358S003060, C358S509000, C358S518000, C358S534000, C283S085000, C283S113000, C283S902000, C235S468000

Reexamination Certificate

active

08064100

ABSTRACT:
A system is employed to reveal a watermark in a document. A watermark generator is utilized to select the placement and at least one colorant combination of an image and at least one colorant combination for a watermark on a document, where the at least one colorant combination of the image and the watermark form a metameric pair. A printing system receives data from the watermark generator and places the image and the watermark on the document. A decoder comprising a narrow band illumination element is selected or tuned to a wavelength corresponding to the colorant combinations utilized by the printing system to reveal the watermark placed thereon.

REFERENCES:
patent: 7800785 (2010-09-01), Bala et al.
patent: 2007/0262579 (2007-11-01), Bala et al.
patent: 2008/0302263 (2008-12-01), Eschbach et al.
patent: 2008/0305444 (2008-12-01), Eschbach et al.
patent: 2009/0237682 (2009-09-01), Bala et al.
patent: 2010/0142003 (2010-06-01), Braun et al.
patent: 2011/0052888 (2011-03-01), Eschbach et al.

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