Digitally watermarked maps and signs and related...

Details Digitally watermarked maps and signs and related... Digitally watermarked maps and signs and related...

2007-07-24

2007-07-24

Moazzami, Nasser (Department: 2136)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C380S258000, C707S793000

Reexamination Certificate

active

09833013

ABSTRACT:
Maps and signs are embedded with plural-bit data in the form of digital watermarks. In one embodiment, the plural-bit data includes location information with respect to a map. A handheld reading device extracts the location information from the map. The reading device then compares the location information with a physical location of the device. Feedback is provided to help a device user to correlate the map location with the physical location. In another embodiment, signs are watermarked to provide navigational and informational aids. The watermarks may include unique identifiers, which allow database lookup of related information.

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