Extracting digital watermarks using logarithmic sampling and symmetrical attributes

A method of extracting a digital watermark in an audio signal comprising:

• performing a logarithmic sampling of the media signal to produce a sampled signal;
• analyzing the sampled signal to detect attributes associated with a watermark signal;
• and
• extracting the digital watermark based on detected attributes associated with the watermark signal.

A method of extracting a digital watermark in an image signal comprising:

• performing a polar sampling of the video signal to produce a sampled signal;
• analyzing the sampled signal to detect attributes associated with a watermark signal;
• and
• extracting the digital watermark based on detected attributes associated with the watermark signal.

A method of extracting a digital watermark in a media signal comprising:

• transforming the media signal to a transform domain;
• analyzing the transformed media signal to detect a symmetrical attribute associated with a watermark signal;
• and
• extracting the digital watermark based on detected attributes associated with the watermark signal.