Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data
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Abstract
Disclosed herein are methods and systems for encoding digital watermarks into content signals. Also disclosed are systems and methods for detecting and/or verifying digital watermarks in content signals. According to one embodiment, a system for encoding of digital watermark information includes: a window identifier for identifying a sample window in the signal; an interval calculator for determining a quantization interval of the sample window; and a sampler for normalizing the sample window to provide normalized samples. According to another embodiment, a system for pre-analyzing a digital signal for encoding at least one digital watermark using a digital filter is disclosed. According to another embodiment, a method for pre-analyzing a digital signal for encoding digital watermarks comprises: (1) providing a digital signal; (2) providing a digital filter to be applied to the digital signal; and (3) identifying an area of the digital signal that will be affected by the digital filter based on at least one measurable difference between the digital signal and a counterpart of the digital signal selected from the group consisting of the digital signal as transmitted, the digital signal as stored in a medium, and the digital signal as played backed. According to another embodiment, a method for encoding a watermark in a content signal includes the steps of (1) splitting a watermark bit stream; and (2) encoding at least half of the watermark bit stream in the content signal using inverted instances of the watermark bit stream. Other methods and systems for encoding/decoding digital watermarks are also disclosed.
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Citations
88 Claims
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1-49. -49. (canceled)
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50. A method for pre-processing a digital data signal to authorize a plurality of unique descendant copies of the digital data signal, comprising:
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providing the digital data signal;
identifying a plurality of candidate bits in the digital data signal that can be manipulated during embedding;
generating a digital watermark message to be embedded based on at least one predetermined criterion; and
embedding the digital watermark message in the plurality of candidate bits. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61)
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62. A method for pre-processing a digital data signal to authorize a plurality of unique descendant copies of the digital data signal, comprising:
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providing a digital data signal;
identifying candidate bits of the digital data signal that will be manipulated during scrambling;
generating a key on at least one predetermined criterion; and
manipulating the digital data signal at the plurality of candidate bits with the scrambling key. - View Dependent Claims (63, 64, 65, 66, 67, 68, 69, 70, 71, 72)
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73. A method for creating a descendant copy of a digital data signal, comprising:
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obtaining a model for the digital data signal; and
generating a watermark for the descendant copy of the digital data signal based on at least one criterion. - View Dependent Claims (74, 75, 76, 77, 78)
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79. A method for pre-processing a digital data signal, comprising:
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providing a digital signal;
identifying a plurality of candidate bits in the digital data signal that can be manipulated during embedding;
generating at least one digital watermark message to be embedded based on at least one predetermined criterion;
selecting candidate bits to manipulate; and
embedding the at least one digital watermark message in the selected candidate bits. - View Dependent Claims (80, 81, 82, 83, 84, 85, 86, 87, 88)
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Specification