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US 7,460,684 B2Granted
Method and apparatus for embedding watermarks
AssigneeNielsen Media Research, Inc.
InventorVenugopal Srinivasan
Life of this patent
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Abstract
Methods and apparatus for embedding a watermark are disclosed. In an example method, one or more frames associated with a compressed digital data stream (240) is identified. Each of the one or more frames is unpacked to determine a plurality of transform coefficient sets (320). The plurality of transform coefficient sets (320) is modified to embed the watermark (230).
Claims60
A method of embedding a watermark comprising:
- identifying one or more frames associated with a compressed digital data stream;
- unpacking each of the one or more frames to identify a plurality of transform coefficient sets;
- and
- modifying the plurality of transform coefficient sets to embed the watermark by:
- determining a mantissa code associated with a watermarked transform coefficient of one of a plurality of watermarked transform coefficient sets;
- and
- substituting the mantissa code associated with the watermarked transform coefficient for a mantissa code associated with a corresponding transform coefficient of one of the plurality of transform coefficient sets.
4 more elements
An apparatus for embedding a watermark comprising:
- an identifier to identify one or more frames associated with a compressed digital data stream;
- an unpacker to unpack each of the one or more frames to identifying a plurality of transform coefficient sets;
- and
- a modifier to determine a mantissa code associated with a watermarked transform coefficient of one of a plurality of watermarked transform coefficient sets and to substitute the mantissa code associated with the watermarked transform coefficient for a mantissa code associated with a corresponding transform coefficient of one of the plurality of transform coefficient sets to modify the plurality of transform coefficient sets to embed the watermark.
1 more element
A computer accessible medium storing computer readable instructions, which when executed, cause a computer to:
- identify one or more frames associated with a compressed digital data stream;
- unpack each of the one or more frames to identify a plurality of transform coefficient sets;
- and
- modify the plurality of transform coefficient sets to embed a watermar by:
- determining a mantissa code associated with a watermarked transform coefficient of one of a plurality of watermarked transform coefficient sets;
- and
- substituting the mantissa code associated with the watermarked transform coefficient for a mantissa code associated with a corresponding transform coefficient of one of the plurality of transform coefficient sets.
4 more elements
Dependencies are inferred from the claim text.