Image attribute altering device and electronic watermark embedding device
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United States of America Patent
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-
Dec 23, 2003
Grant Date -
Jul 24, 2003
app pub date -
May 14, 1999
filing date -
May 15, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Image attribute detection means for detecting the attribute of an input image (attribute 'A') and image attribute altering means for altering the image attribute in the input image on the basis of the attribute detection result of the input image are provided to output an output image having a new attribute (attribute 'B'). The image attribute detection means includes first DCT means for subjecting the input image to discrete cosine transform to obtain frequency components, second DCT means for subjecting the original image to discrete cosine transform to obtain original frequency components, and means of subtracting the original frequency components from the image frequency components and dividing the subtraction result by the image frequency components to detect the electronic watermark data.
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