Watermarking technique for scaled image
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United States of America Patent
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Feb 28, 2006
Grant Date -
May 23, 2002
app pub date -
Nov 21, 2001
filing date -
Nov 22, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A watermarking system allowing an appended-type watermark to be easily inserted into a scaled-up/down image without deteriorating the detection accuracy of the appended-type watermark is disclosed. A first scaling factor of an input watermarked image is detected by detecting a copy control watermark from the input watermarked image. It is determined whether a watermark including a second scaling factor is detected from the input watermarked image. When the watermark including the second scaling factor fails to be detected, a second watermark including the first scaling factor is created and embedded into the input watermarked image and further an appended-type watermark is inserted into the input watermarked image. When the watermark including the second scaling factor is detected, the first and second scaling factors are used to calculate a third scaling factor, which is used to detect the appended-type watermark.
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