Digitally watermarking holograms for identity documents
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United States of America Patent
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Apr 19, 2005
Issued Date -
N/A
app pub date -
Jun 18, 2003
filing date -
Dec 21, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to digital watermarks integrated into holograms, watermarked hologram structures, and related applications as an authentication technique. One method creates a watermark image, and then embeds the watermark image into a holographic structure. The holographic structure is carried by a smart card. The smart card includes additional information. In one embodiment, the digital watermark includes information bits, and these information bits are used to authenticate the hologram, or the smart card. In another embodiment, the watermark's information bits are compared with the additional information carried by the smart card. The result of the comparison is used to authenticate the smart card or the hologram.
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