Method and apparatus for recording and reproducing electronic watermark information, and recording medium
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United States of America Patent
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Mar 18, 2003
Grant Date -
N/A
app pub date -
Aug 24, 1998
filing date -
Sep 3, 1997
priority date (Note) -
In Force
status (Latency Note)
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Abstract
At recording of a video signal, with electronic watermark information being embedded therein, on a recording medium, a reference signal which is formed differently from the watermark information is inserted to the video signal. At reproduction of the video signal, the luminance of the watermark information is modified based on the reference signal.
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