Apparatus and method for inserting and detecting watermark based on stochastic model
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United States of America Patent
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Feb 8, 2005
Grant Date -
Sep 26, 2002
app pub date -
Dec 14, 2000
filing date -
Jun 15, 2000
priority date (Note) -
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Abstract
A method for inserting and detecting a watermark based on a stochastic model is disclosed. The apparatus for inserting a watermark based on a stochastic model, includes: a generator for generating a spread spectrum signal by using a user key from outside; an estimator for estimating an autocorrelation matrix of an original signal from outside as an object for inserting a watermark; an eigenvalue decomposer for decomposing the autocorrelation matrix to an eigenvector matrix and an eigenvalue matrix; a watermark shaper for shaping a watermark from the spread spectrum signal in reference to both the eigenvector matrix and the eigenvalue matrix; and an adder for adding the watermark to the original signal.
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