Digital watermarking apparatus and its method and digital watermark reproducing apparatus and its method
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United States of America Patent
Stats
-
N/A
Issued Date -
Sep 12, 2002
app pub date -
Jan 17, 2002
filing date -
Jan 23, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An encryption mixer transforms the intensity values of image signals in a predetermined area, specified by an area specifier, based on encryption data from an encryption data generator. To do so, for an odd-numbered line and an even-numbered line in the predetermined area, the encryption mixer calculates the average of the intensity values of the image signals in the even-numbered line and compares the average with the intensity value of each pixel in the odd-numbered line. The encryption mixer increments CNT.sub.pos1 by 1 when the average is smaller, and increments CNT.sub.nega by 1 when the average is larger. Then, the encryption mixer modifies the intensity values of the image signals in the odd-numbered line such that CNT.sub.pos1>CNT.sub.nega when the bit to be embedded is '1' and such that CNT.sub.pos1
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