Covert digital identifying indicia for digital image
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United States of America Patent
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Apr 11, 2000
Grant Date -
N/A
app pub date -
May 28, 1997
filing date -
May 28, 1997
priority date (Note) -
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status (Latency Note)
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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.
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