Adaptive watermarking
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United States of America Patent
Stats
-
Aug 21, 2007
Grant Date -
Apr 6, 2006
app pub date -
Sep 22, 2003
filing date -
Oct 30, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus (200) for embedding a watermark in an information signal bit-stream are described. The method comprises receiving a portion of an information signal bit-stream (MPEG2). A first copy of the received portion is stored in a first buffer (220). A second copy of the received portion is watermarked, and the resulting watermarked signal stored in a second buffer (240). At predetermined intervals, a check is performed to determine if the bit-rate of the received portion has been changed by being watermarked. If the check determines the bit-rate has changed, the first copy of the received portion from the first buffer is output. Otherwise the watermarked signal from the second buffer is output.
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