Embedding and extraction of information from an embedded...

Details Embedding and extraction of information from an embedded... Embedding and extraction of information from an embedded...

2009-04-17

2011-12-27

Shiferaw, Eleni (Department: 2437)

Cryptography

Video cryptography

Video electric signal masking

C380S255000, C713S178000

Reexamination Certificate

active

08085935

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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