Method for data preparation and watermark insertion
First Claim
1. A method for data preparation and watermark insertion, the data having sets of data characteristics, the method comprising the steps of:
- providing data to be watermarked;
selecting a target signal;
extracting a derived signal from a set of data characteristics;
preparing the data at a first time to improve detectability of a subsequently inserted first watermark signal and/or reduce the complexity of the subsequent insertion of the first watermark signal by manipulating at least one set of the data characteristics such that the derived signal substantially matches the target signal; and
inserting the first watermark by manipulating the set of data characteristics at a second time subsequent to the first time.
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Abstract
A method for data preparation and watermark insertion. The method includes the step of preparing the data at a first time by manipulating at least one set of the data characteristics for subsequent insertion of a first watermark. In a preferred embodiment of the method of the present invention the method further includes the step of inserting the first watermark by manipulating the set of data characteristics at a second time subsequent to the first time. In still yet another preferred embodiment of the method of the present invention, the method further includes the step of inserting a second watermark at a third time, before, during, or after the first time, by manipulating at least one set of the data characteristics. In a variation of the present invention a method for inserting a watermark into compressed data is provided. The compressed data has sets of data characteristics. The method includes the steps of inserting a watermark by manipulating the set of data characteristics; and optimizing the manipulated data by modifying the compressed data characteristics subject to a set of constraints.
385 Citations
37 Claims
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1. A method for data preparation and watermark insertion, the data having sets of data characteristics, the method comprising the steps of:
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providing data to be watermarked;
selecting a target signal;
extracting a derived signal from a set of data characteristics;
preparing the data at a first time to improve detectability of a subsequently inserted first watermark signal and/or reduce the complexity of the subsequent insertion of the first watermark signal by manipulating at least one set of the data characteristics such that the derived signal substantially matches the target signal; and
inserting the first watermark by manipulating the set of data characteristics at a second time subsequent to the first time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
(i) obtaining a set of values from the compressed data;
(ii) determining a set of changes to the data that satisfy the set of constraints;
(iii) choosing a change from the set of changes that optimize detection of the watermark in the absence of any future changes; and
(iv) repeating steps (i) through (iii) until all the compressed data is processed.
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26. The method of claim 25, wherein the set of constraints comprises fidelity constraints.
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27. The method of claim 25, wherein the set of constraints comprises bitrate constraints.
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28. The method of claim 25, wherein the set of constraints comprises constraining each value in the compressed data to a known quantization level.
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29. The method of claim 24, wherein the set of constraints comprises fidelity constraints.
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30. The method of claim 24, wherein the set of constraints comprises bitrate constraints.
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31. The method of claim 24, wherein the set of constraints comprises constraining each value in the compressed data to a known quantization level.
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32. The method of claim 1, wherein the first time occurs prior to data distribution and wherein the first watermark is inserted into the data at the time the data is copied.
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33. The method of claim 32, further comprising the step of prohibiting the copying of the data if the first watermark is present.
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34. The method of claim 33, wherein the prohibiting step is implemented in a consumer recording device.
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35. The method of claim 34, wherein the format of the recording device is chosen from a group consisting of DVD, DHVS, DAT, and CD-R.
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36. The method of claim 1, wherein the set of data characteristics are time domain characteristics.
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37. The method of claim 1, wherein the set of data characteristics are spatial and time domain characteristics.
Specification