Optimization methods for the insertion, protection, and detection of digital watermarks in digital 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.
180 Citations
125 Claims
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1-88. -88. (canceled)
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89. A method for generating a plurality of unique copies of a digital data signal, comprising:
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obtaining the digital data signal; identifying a plurality of candidate bits in the digital data signal that can be manipulated during encoding; obtaining a digital watermark message to be encoded based on at least one predetermined criterion; and encoding the digital watermark message in the plurality of candidate bits. - View Dependent Claims (90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100)
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101. A process for generating a plurality of unique copies of a digital signal, comprising:
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obtaining a digital signal; identifying at least one candidate bit of the digital signal that will be manipulated during embedding; generating a key based on at least one predetermined criterion; and manipulating the at least one candidate bit with the key. - View Dependent Claims (102, 103, 104, 105, 106, 107, 108, 109)
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110. An article of manufacture comprising a machine readable medium, having thereon stored instructions adapted to be executed by a processor, which instructions when executed result in a process comprising:
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obtaining a model for a data signal wherein the model describes watermarking parameters; generating a watermark to be embedded in the data signal based on at least one criterion; and embedding the generated watermark using the obtained model of the data signal to create a watermarked data signal. - View Dependent Claims (111, 112, 113, 114, 115)
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116. An article of manufacture comprising a machine readable medium, having thereon stored instructions adapted to be executed by a processor, which instructions when executed
result in a process comprising: -
receiving a data signal; identifying a plurality of candidate bits in the data signal that can be manipulated during encoding; generating at least one watermark to be encoded based on at least one criterion;
determining candidate bits to manipulate; andencoding the at least one watermark in the determined candidate bits. - View Dependent Claims (117, 118, 119, 120, 121, 122, 123, 124, 125)
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Specification