Z-transform implementation of digital watermarks

Details Z-transform implementation of digital watermarks Z-transform implementation of digital watermarks

2005-02-08

2005-02-08

Barrón, Gilberto (Department: 2132)

Cryptography

Particular algorithmic function encoding

C380S045000, C380S030000, C713S176000

Reexamination Certificate

active

06853726

ABSTRACT:
Z-transform calculations may be used to encode (and/or decode) carrier signal independent data (e.g., digital watermarks) to a digital sample stream. Deterministic and non-deterministic components of a digital sample stream signal may be analyzed for the purposes of encoding carrier signal independent data to the digital sample stream. The carrier signal independent data may be encoded in a manner such that it is restricted or concentrated primarily in the non-deterministic signal components of the carrier signal. The signal components can include a discrete series of digital samples and/or a discreet series of carrier frequency sub-bands of the carrier signal. Z-transform calculations may be used to measure a desirability of particular locations and a sample stream in which to encode the carrier signal independent data.

REFERENCES:
patent: 4729112 (1988-03-01), Millar
patent: 4797923 (1989-01-01), Clarke
patent: 5448206 (1995-09-01), Newhall
patent: 6078664 (2000-06-01), Moskowitz et al.
Schneier, Bruce, Applied Cryptography, John Wiley & Sons Inc., Second Ediition, p. 226.

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