Watermarking a compressed information signal
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United States of America Patent
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Issued Date -
Sep 12, 2002
app pub date -
Jan 17, 2002
filing date -
Jan 23, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method and arrangement are disclosed for embedding a watermark in an MPEG compressed video stream. The watermark (a spatial noise pattern) is embedded by selectively discarding the smallest quantized DCT coefficients. The discarded coefficients are subsequently merged in the runs of the remaining coefficients. The decision whether a coefficient is discarded or not is made on the basis of a pre-calculated watermark buffer and the number of already discarded coefficients per 8.times.8 DCT block. The advantages of this method are (i) a very simple bit rate control system and (ii) no need for drift compensation. The algorithm can be implemented in a very efficient manner with respect to memory requirements and computational complexity.
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