| 摘要 |
<p>Image attribute detection means (102) for detecting the attribute of an input image (101) attribute "A") and image attribute altering means (104) for altering the image attribute in the input image (101) on the basis of the attribute detection result (103) of the input image (101) are provided to output an output image (105) having a new attribute (attribute "B"). The image attribute detection means (102) 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. <IMAGE></p> |
