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.
172 Citations
139 Claims
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1-110. -110. (canceled)
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111. An article of manufacture comprising a machine readable medium, having thereon stored instructions adapted to be executed by a processor, which instructions when executed by a processor result in a process 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 (114, 115, 116, 117, 118, 119)
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112. An article of manufacture comprising a machine readable medium, having thereon stored instructions adapted to be executed by a processor, which instructions when executed by a processor result in a process 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 (120, 121, 122, 123, 124, 125)
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113. An article of manufacture comprising a machine readable medium, having thereon stored instructions adapted to be executed by a processor, which instructions when executed by a processor result in a process 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 to be encoded in the signal. - View Dependent Claims (126, 127, 128, 129, 130, 131)
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132. A digital watermarking system, comprising:
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a receiver for receiving a signal; an analyzer for determining locations in the signal comprising candidate bits; and a watermark message generator for generating at least one watermark message wherein a generated watermark message is associated with at least one candidate bit determined in the analyzing step. - View Dependent Claims (133, 134, 137, 138)
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135. An article of manufacture comprising a machine readable medium, having thereon stored instructions adapted to be executed by a processor, which instructions when executed by a processor result in a process comprising:
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receiving content; generating at least one watermark message comprising unique information; and embedding the generated watermark message in candidate bits. - View Dependent Claims (136)
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139. The article of 134, wherein the article is a device configured to play &
- /or record copyrighted content.
Specification