Method and apparatus for embedding and retrieving additional data in an encoded data stream
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United States of America Patent
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May 16, 2000
Grant Date -
N/A
app pub date -
Jan 16, 1998
filing date -
Jan 16, 1998
priority date (Note) -
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Abstract
A method and apparatus for embedding and retrieving an additional data bitstream in an encoded data stream, such as MPEG. The embedded data is processed and a choice parameter in the header portion of the encoded data stream is varied according to the embedded information bit pattern. Optimization of the encoded data stream is not significantly affected. The embedded information is robust in that the encoded data stream would need to be decoded and re-encoded in order to change a bit of the embedded information. As relevant portions of the header are not scrambled to facilitate searching and navigation through the encoded data stream, the embedded data can generally be retrieved even when the encoded data stream is scrambled.
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