METHOD AND APPARATUS FOR EMBEDDING WATERMARKS
First Claim
1. A method to embed media identification information in a compressed media data stream, the method comprising:
- reconstructing an uncompressed media data stream from the compressed media data stream, the uncompressed media data stream separate from the compressed media data stream;
embedding the media identification information in the uncompressed media data stream to determine a watermarked uncompressed media data stream; and
modifying a first mantissa value corresponding to a first transform coefficient associated with the compressed media stream to embed the media identification information in the compressed media data stream without uncompressing the compressed media data stream, the modification of the first mantissa value based on a difference between the first transform coefficient and a corresponding second transform coefficient generated from the watermarked uncompressed media data stream.
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Abstract
Methods and apparatus for embedding a watermark are disclosed. An example method to embed media identification information in a compressed media data stream disclosed herein comprises reconstructing an uncompressed media data stream from the compressed media data stream, the uncompressed media data stream separate from the compressed media data stream, embedding the media identification information in the uncompressed media data stream to determine a watermarked uncompressed media data stream, and modifying a first mantissa value corresponding to a first transform coefficient associated with the compressed media stream to embed the media identification information in the compressed media data stream without uncompressing the compressed media data stream, the modification of the first mantissa value based on a difference between the first transform coefficient and a corresponding second transform coefficient generated from the watermarked uncompressed media data stream.
121 Citations
20 Claims
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1. A method to embed media identification information in a compressed media data stream, the method comprising:
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reconstructing an uncompressed media data stream from the compressed media data stream, the uncompressed media data stream separate from the compressed media data stream; embedding the media identification information in the uncompressed media data stream to determine a watermarked uncompressed media data stream; and modifying a first mantissa value corresponding to a first transform coefficient associated with the compressed media stream to embed the media identification information in the compressed media data stream without uncompressing the compressed media data stream, the modification of the first mantissa value based on a difference between the first transform coefficient and a corresponding second transform coefficient generated from the watermarked uncompressed media data stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of embedding a watermark comprising:
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identifying a transform coefficient associated with a compressed digital data stream; obtaining a mantissa code; and modifying the transform coefficient based on the mantissa code to embed the watermark. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method to determine ratings information comprising:
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extracting identification information embedded in presented media content, the identification information embedded in a broadcasted compressed audio data stream corresponding to the presented media content, the identification information embedded in the compressed audio data stream without uncompressing the compressed audio data stream by; modifying a first mantissa value corresponding to a first transform coefficient associated with the compressed audio data stream to embed the identification information into the compressed audio data stream, the first mantissa value to be modified based on a difference between the first transform coefficient and a corresponding second transform coefficient generated from a separate uncompressed version of the compressed audio data stream into which the identification information has also been embedded. - View Dependent Claims (19, 20)
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Specification