Watermarks carrying content dependent signal metrics for detecting and characterizing signal alteration
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United States of America Patent
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Jan 28, 2003
Grant Date -
N/A
app pub date -
Oct 11, 2000
filing date -
Oct 11, 2000
priority date (Note) -
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Abstract
The invention provides methods and systems for detecting and characterizing alterations of media content, such as images, video and audio signals, using watermark messages to carry signal metrics. By comparing signal metrics extracted from the watermark to signal metrics calculated from a suspect signal, a watermark decoder can detect and even classify types of alterations to the watermarked signal.
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