| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for conducting an enlargement/reduction deformation processing on an original picture and judging whether deformed picture information from which electronic watermark information cannot be read is formed or not. SOLUTION: The device is provided with a Fourier transformation processing means 3 obtaining an intra-Fourier space picture 20 from an obtained picture 2, a means 4 burying a reference information signal S into the picture 20, an inverse Fourier transformation processing means 5 which transforms the intra-Fourier space picture 20 including the reference information signal S into an intra-picture space picture 30, a size change means 7 which individually changes the size of the picture 30, a means 8 which Fourier-transforms again the respective pictures 30, the detection means 9 of a frequency component value on the reference information signal S of an intra- Fourier space picture 40 and a means 11 arranging the frequency component value in accordance with an enlargement/reduction rate D and judging the presence/absence of a projected component value from a peripheral frequency component value.
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