Optimization methods for the insertion, protection and detection of digital watermarks in digital data
First Claim
1. A method for guaranteeing watermark uniqueness, comprising:
- providing a watermark and a signal to be encoded;
attaching a timestamp to the watermark; and
encoding the signal with the timestamp and the watermark.
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Accused Products
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
25 Claims
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1. A method for guaranteeing watermark uniqueness, comprising:
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providing a watermark and a signal to be encoded; attaching a timestamp to the watermark; and encoding the signal with the timestamp and the watermark. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for guaranteeing watermark uniqueness, comprising:
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providing a watermark and a signal; attaching a user identification dependent hash to the watermark; and encoding the user identification dependent hash and the watermark into the signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for guaranteeing watermark uniqueness, comprising:
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providing a watermark and a signal to encode; and attaching a message digest of watermark data to the watermark said watermark and said message digest of watermark data having then been encoded within the signal. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A digital watermarking apparatus, comprising:
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a receiver to receive a signal an analyzer to determine locations in the signal comprising candidate bits; and a watermark message generator wherein a generated watermark message is associated with at least one candidate bit determined in the analyzing step. - View Dependent Claims (23)
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24. A system for guaranteeing watermark uniqueness, comprising:
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a receiver to receive content; a watermark message generator; and a processor for associating at least one generated watermark message with at least one unique bit comprising embedding the generated watermark message in candidate bits. - View Dependent Claims (25)
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Specification