Encoding invisible electronic information in a printed document

Details Encoding invisible electronic information in a printed document Encoding invisible electronic information in a printed document

2008-07-08

2008-07-08

Tran, Douglas Q. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S001180

Reexamination Certificate

active

07397584

ABSTRACT:
A printed image can be redundantly encoded by printing a visible image using a colorant with a luminance that contrasts with that of the output sheet and printing a redundant image using a colorant with a luminance that varies only slightly from that of the output sheet. Accordingly, the visible image can be easily read by a user while the redundant image is substantially invisible to the human eye at normal-reading distances, yet capable of being captured by a conventional digital scanner. In one aspect, redundantly encoded images may be printed on a white background, with visible images printed in black text and redundant images printed in blue in content regions of the visible image and in yellow in its background regions.

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