System and method of watermarking a signal

Details System and method of watermarking a signal System and method of watermarking a signal

2006-04-04

2008-11-11

Nguyen, Minh Dieu (Department: 2137)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C380S252000

Reexamination Certificate

active

07451318

ABSTRACT:
A method of retrieving a watermark in a watermarked signal involves processing a signal having odd- and even-overlapped blocks and where the watermark is contained in the even blocks. For each k-th block, the method comprises subtracting the odd-numbered blocks from the k-th block of the watermarked signal to generates*k(n), applying an FFT tos*k(n) to generate a phaseSk(ƒ), calculating a phase ofSk(ƒ) asφ(ƒ) and a phase of an original signal Sk(ƒ) as φ(ƒ), calculating the difference Ψ(ƒ) betweenφ(ƒ) and φ(ƒ); and retrieving the watermark embedded in Ψ(ƒ). A Viterbi search may be the algorithm used to retrieve the watermark.

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