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.
119 Citations
110 Claims
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1-40. -40. (canceled)
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41. A method for guaranteeing watermark uniqueness, comprising:
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providing a watermark; and
attaching a timestamp to the watermark. - View Dependent Claims (89, 90, 91, 92, 93, 94)
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42. A method for guaranteeing watermark uniqueness, comprising:
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providing a watermark; and
attaching a user identification dependent hash to the watermark. - View Dependent Claims (95, 96, 97, 98, 99, 100)
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43. A method for guaranteeing watermark uniqueness, comprising:
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providing a watermark; and
attaching a message digest of watermark data to the watermark. - View Dependent Claims (101, 102, 103, 104, 105, 106)
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44-88. -88. (canceled)
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107. A digital watermarking apparatus, comprising:
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a receiver to receive candidate bits; and
a watermark message generator wherein a generated watermark message is associated with at least one received candidate bit. - View Dependent Claims (108)
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109. A system for guaranteeing watermark uniqueness, comprising:
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a watermark message generator; and
a processor for associating at least one generated watermark message with at least one unique bit. - View Dependent Claims (110)
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Specification