Covert digital identifying indicia for digital image

Details Covert digital identifying indicia for digital image Covert digital identifying indicia for digital image

1997-05-28

2000-04-11

Couso, Jose L.

Image analysis

Pattern recognition

382232, 380 3, 380 4, G06K 900

Patent

active

060496274

ABSTRACT:
A method and system for affixing covert identifying indicia to a digital image document, by altering pixel luminance and/or saturation in the image in selected areas of the image to a selected differential in luminance and/or saturation. The differential in luminance and/or saturation is selected to be in a range which is minimally detectable by the human eye. The identifying indicia may be detected by checking the digital document for patterns of differential luminance and/or saturation in the selected range of the differential.

REFERENCES:
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patent: 5530751 (1996-06-01), Morris
patent: 5530759 (1996-06-01), Braudaway et al.
patent: 5568550 (1996-10-01), Ur
patent: 5613004 (1997-03-01), Cooperman et al.
patent: 5636292 (1997-06-01), Rhoads
patent: 5822676 (1998-10-01), Hayashi et al.

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