Cryptography – Video cryptography – Video electric signal masking
Reexamination Certificate
2004-01-26
2009-10-20
Moise, Emmanuel L (Department: 2437)
Cryptography
Video cryptography
Video electric signal masking
C705S057000, C705S062000, C713S176000, C726S026000, C726S031000, C726S032000
Reexamination Certificate
active
07606366
ABSTRACT:
Apparatus and methods are provided for embedding or embedding digital data into an analog host or cover signal. A distributed signal feature of the cover signal in a particular domain (time, frequency or space) is calculated and compared with a set of predefined quantization values corresponding to an information symbol to be encoded. The amount of change required to modify the signal feature to the determined target quantization value is calculated and the cover signal is modified accordingly to so change the feature value over a predefined interval. Information symbols are extracted by the opposite process. In one embodiment, the predefined value is a short term autocorrelation value of the cover signal.
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Callahan Paul
Foley & Lardner LLP
Moise Emmanuel L
Verance Corporation
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