Watermark detection
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United States of America Patent
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Jun 10, 2003
Grant Date -
N/A
app pub date -
Oct 26, 1999
filing date -
Oct 29, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An input image is distorted so that it has less correlation to a watermark and the distorted image is subtracted from the input image to provide a preprocessed image. If the correlation between the preprocessed image and a watermark is sufficient then the watermark is detected in the input image. The distortion may be a spatially-variant distortion such as stretching, shrinking, shearing or rotation or the distortion may be a non-linear transforming or filtering such as median, local minimum or local maximum filtering.
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