Feature-based watermarks and watermark detection strategies
First Claim
Patent Images
1. A feature based embedding method for hiding auxiliary data in a media signal comprising:
- identifying N features in the media signal, where N comprises an integer greater than one; and
embedding a signal around the N features by modulating sample values in a group of samples around each feature according to a signal layer, wherein the features comprise peaks of a mathematical derivative of the media signal.
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Abstract
Processes and apparatus for improving the state of the art for watermarking and data protection. The disclosure includes feature-based watermarks, auto- and cross-correlation techniques for determining scaling and rotation, transitions in time based watermarking, autocorrelation watermarks for images, and dynamic content scrambling of static files.
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Citations
12 Claims
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1. A feature based embedding method for hiding auxiliary data in a media signal comprising:
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identifying N features in the media signal, where N comprises an integer greater than one; and embedding a signal around the N features by modulating sample values in a group of samples around each feature according to a signal layer, wherein the features comprise peaks of a mathematical derivative of the media signal. - View Dependent Claims (2, 3)
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4. A feature based watermark embedding method for hiding auxiliary data in a media signal comprising:
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identifying N features in the media signal, where N comprises an integer greater than one; and embedding a watermark around the N features by modulating sample values in a group of samples around each feature according to a watermark signal layer, wherein different types of watermark signals are embedded into the media signal;
a first type embedded around at least some of the N features in the media signal, and a second type embedded in at least some parts of the media signal. - View Dependent Claims (5, 6, 7, 8)
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9. A feature based watermark embedding method for hiding auxiliary data in a media signal comprising:
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identifying N features in the media signal, where N comprises an integer greater than one; and embedding a watermark around the N features by modulating sample values in a group of samples around each feature according to a watermark signal layer, wherein the watermark signal has correlation properties that enable a watermark decoder to compensate for scaling distortion by computing auto or cross correlation of the watermarked signal and deriving scaling from positioning of peaks in a resulting signal.
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10. A feature based watermark embedding method for hiding auxiliary data in a media signal comprising:
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identifying N features in the media signal, where N comprises an integer greater than one; and embedding a watermark around the N features by modulating sample values in a group of samples around each feature according to a watermark signal layer, wherein the watermark comprises a PN sequence of symbol values of either 1 or −
1, the symbols are mapped to samples of the media signal, and transitions in phase between adjacent groups of samples corresponding to different symbols are made to change slowly.
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11. A method of decoding a feature based watermark that hides auxiliary data in a media signal comprising:
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identifying N features in the media signal, where N comprises an integer greater than one; and decoding a watermark around the N features by correlating sample values in a group of samples around each feature with a watermark signal layer; using one of the N features as a reference for decoding auxiliary data for one or more of the other features, wherein multiple different watermark layers are decoded including watermark layers around the features and elsewhere. - View Dependent Claims (12)
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Specification