Authentication of physical and electronic media objects using digital watermarks
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United States of America Patent
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May 8, 2012
Grant Date -
Apr 21, 2011
app pub date -
Oct 26, 2010
filing date -
Apr 17, 2000
priority date (Note) -
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Abstract
Digital watermark methods for encoding auxiliary data into a host signal are used to authenticate physical and electronic objects. One such method computes a content specific message dependent on the host signal, encodes the content specific message into a watermark signal, and embeds the watermark in the host signal such that the watermark signal is substantially imperceptible in the host signal. One specific implementation embeds data representing salient features of the host signal into the watermark. For example, for photo IDs, the method embeds the spatial location of salient features of the photo into the watermark.
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