Invention Grant
- Patent Title: Watermark encoding and detection using narrow band illumination
- Patent Title (中): 使用窄带照明的水印编码和检测
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Application No.: US12329082Application Date: 2008-12-05
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Publication No.: US08064100B2Publication Date: 2011-11-22
- Inventor: Karen M. Braun , Raja Bala , Robert P. Loce
- Applicant: Karen M. Braun , Raja Bala , Robert P. Loce
- Applicant Address: US CT Norwalk
- Assignee: Xerox Corporation
- Current Assignee: Xerox Corporation
- Current Assignee Address: US CT Norwalk
- Agency: Fay Sharpe LLP
- Main IPC: H04N1/44
- IPC: H04N1/44 ; H04N1/52 ; H04N1/56 ; G06K15/02 ; B41M3/10 ; G07D7/12

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.
Public/Granted literature
- US20100142003A1 WATERMARK ENCODING AND DETECTION USING NARROW BAND ILLUMINATION Public/Granted day:2010-06-10
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