| 摘要 |
PROBLEM TO BE SOLVED: To attach information to image data while keeping the visibility of images indicated by the image data to a certain degree. SOLUTION: An information insertion part 114 changes the image size of a graphic mark 123 so as to turn the number of vertical and horizontal pixels to 32×n+a respectively. In this case, (a) is a decimal number indicated by the bit string of 5 bits of insertion information 122 to be buried and (n) is a numerical value for making 32×n+a closest to the original image size (128, in this case) of the graphic mark 123. Also, the respective pixel values of the graphic mark 123 are changed so as to make the average value/contrast of the pixel values of the entire graphic mark 123 to 32×n+a. In this case, (a) is the decimal number indicated by the bit string of 5 bits to be buried and (n) is the numerical value for making 32×n+a closest to the average value/ contrast of the original pixel values of the entire graphic mark 123.
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