Method of authenticating digital-watermark pictures
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United States of America Patent
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Jul 9, 2002
Grant Date -
N/A
app pub date -
Aug 26, 1999
filing date -
Aug 28, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
An extraction process includes the steps of carrying out a geometric transformation on a picture being inspected to transform the size of the picture being inspected into a reduced scale of an original picture; creating a plurality of degraded original pictures with different types each obtained as a result of degradation of the original picture; creating a plurality of differential pictures by subtraction of the degraded original pictures with different types from the picture being inspected with a transformed size to cancel degradation components in the picture being inspected with a transformed size; and extracting the information corresponding to the authentication information.
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