Patent ID: 6483927
Filing Date: 2002-11-19
Classification: G06T,G10L,H04N

Abstract:
A method of hiding auxiliary data in a media signal such that the auxiliary data is imperceptible to a viewer or listener yet recoverable by an automated auxiliary data reader, comprising:quantizing a first set of feature samples of the media signal to embed a reference signal into the media signal, where the reference signal is comprised of symbols associated with quantizers, and the symbols of the reference signal are embedded by quantizing corresponding samples in the first set with the quantizers associated with the symbols; quantizing a second set of feature samples of the media signal to embed a message signal into the media signal; wherein the embedded reference signal is readable in a geometrically or temporally distorted version of the media signal by estimating quantizers for symbols of the reference signal, and using the estimated quantizers to detect the reference signal.