Device for optically scanning a record carrier
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United States of America Patent
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Jul 2, 2002
Grant Date -
N/A
app pub date -
May 20, 1998
filing date -
May 29, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A watermark detector is disclosed to judge whether multimedia content can be copied or not. The watermark detector examines the multimedia content and outputs a signal indicating whether a watermark is present or not. A decision variable indicating to which extent the watermark is present is determined, for example, the amount of correlation between the input signal and a reference copy of the watermark to be detected. The watermark is detected if the decision variable exceeds a predetermined threshold (y.sub.2). The detector also generates a random output signal for a predetermined range of decision values between the threshold (y.sub.2) and a further threshold (y.sub.1).
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