Holographic digital watermark

Details Holographic digital watermark Holographic digital watermark

2003-01-09

2009-06-23

Wu, Jingge (Department: 2624)

Image analysis

Applications

C216S023000, C216S022000, C283S082000, C283S083000, C283S072000, C283S094000, C283S096000, C235S487000, C235S457000, C235S489000, C382S232000, C382S210000, C359S002000, C359S001000, C380S232000, C380S258000

Reexamination Certificate

active

07551750

ABSTRACT:
A digital watermark which is incorporated, perceptibly or imperceptibly, into a diffractive device such as a hologram. When applied to protect and/or authenticate a document of value or a product, the device provides an increased degree of overt and covert security, and permits tracking of the sale, use or other parameters associated with the product and/or document of value.

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