Digital watermarking technique
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United States of America Patent
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Aug 15, 2006
Issued Date -
N/A
app pub date -
Apr 29, 2004
filing date -
Aug 20, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A watermarking system allowing both sufficiently high quality of watermarked moving pictures and enhanced ease of watermark detection is disclosed. A watermark level of a watermark to be embedded into a picture of data is changed depending on the picture type of a selected block of frequency component data, and then a watermark having the watermark level is inserted into the selected block of frequency component data. Therefore, a moving-picture can be effectively embedded with a digital watermark without substantially reducing the quality of image and the digital watermark can be detected reliably. A relative proportion of watermark levels of I-picture, B-picture, and P-picture is preferably set to 10:7:5.
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