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.
87 Citations
109 Claims
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1-43. -43. (canceled)
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44. A system for digital watermark encode/decode operations, comprising:
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a CODEC database comprising a plurality of CODECs; and
a processor which encodes at least one watermark using at least one CODEC from the CODEC database. - View Dependent Claims (45, 46, 89, 90, 91, 92)
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47. A method for digital watermark encode/decode comprising;
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providing a digital signal stream;
using one or more of a plurality of watermarking CODECs to encode at least one digital watermark; and
associating the one or more of a plurality of watermarking CODECs with a predetermined key. - View Dependent Claims (93)
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48-88. -88. (canceled)
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94. A method of digital watermark encoding, comprising:
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selecting one of a plurality of codecs; and
encoding at least one watermark using the selected codec. - View Dependent Claims (95, 96, 97)
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98. A method of digital watermark decoding, comprising:
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selecting one of a plurality of codecs; and
decoding at least one watermark using the selected codec. - View Dependent Claims (99, 100, 101)
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102. A system for digital watermark operations comprising;
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a selector for selecting a digital signal stream;
an encoder for encoding at least one digital watermark using one of a plurality of watermark codecs; and
a decoder for decoding the at least one digital watermark using one of the plurality of watermark codecs. - View Dependent Claims (103, 104, 105, 106, 107, 108, 109)
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Specification