초록 ▼

A wavelet domain watermark encoder and decoder embed and detect auxiliary signals in a media signal, such as a still image, video or audio signal. A watermark orientation signal is embedded in a wavelet decomposed signal to facilitate detection of the watermark in a geometrically distorted version o

A wavelet domain watermark encoder and decoder embed and detect auxiliary signals in a media signal, such as a still image, video or audio signal. A watermark orientation signal is embedded in a wavelet decomposed signal to facilitate detection of the watermark in a geometrically distorted version of the embedded signal.

대표청구항 ▼

1. A method of encoding an auxiliary signal in a media signal comprising:performing a wavelet decomposition of the media signal into two or more levels of resolution, including an approximate level and one or more higher resolution levels; modifying the approximate level to encode an auxiliary signa

1. A method of encoding an auxiliary signal in a media signal comprising:performing a wavelet decomposition of the media signal into two or more levels of resolution, including an approximate level and one or more higher resolution levels; modifying the approximate level to encode an auxiliary signal such that the modification is substantially imperceptible in an output form of the media signal; wherein the auxiliary signal comprises a watermark orientation signal.