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US 2003/0112997 A1Published application
Watermarks carrying content dependent signal signal metrics for detecting and characterizing signal alteration
AssigneeDigimarc Corporation
InventorFarid Ahmed
Life of this patent
Estimating the term…
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.
Claims20
A method of determining whether a printed object is genuine comprising:
- receiving an image scanned from the object;
- extracting one or more digital watermarks embedded in the image;
- using the one or more digital watermarks along with one or more signal metrics derived from the image as input to a parametric model;
- and
- using the parametric model to classify the object as an original or copy.
2 more elements
A reader for determining whether a printed object is genuine comprising:
- a scanner for scanning an image scanned from the object;
- a digital watermark detector for extracting one or more digital watermarks embedded in the image;
- and
- a parametric model that uses the one or more digital watermarks along with one or more signal metrics derived from the image as input and classifies the object as an original or copy based on the one or more signal metrics.
1 more element
A method of determining whether a printed object is genuine comprising:
- receiving an image scanned from the object;
- extracting one or more digital watermarks embedded in the image, the one or more digital watermarks conveying a message payload conveying information about a signal metric;
- using the one or more digital watermarks along with one or more signal metrics derived from the image as input to a parametric model;
- and
- using the parametric model to classify the object as an original or copy.
2 more elements
Dependencies are inferred from the claim text.