| 摘要 |
PROBLEM TO BE SOLVED: To provide an image processing apparatus and a method in which a digital watermark having strong robustness against geometrical transformation/edit processes such as rotation, scaling, translation, and the like is embedded and the embedded digital watermark can be accurately extracted even after the conversion/edit process such as rotation of an image or the like. SOLUTION: First of all, a Fourier transformer 901 converts an image inputted from an image input unit 900 into amplitude component data and phase component data. Next, an envelope ring pattern generator 902 generates an embedding pattern of digital watermark information expressed by a set of lines that define a circle as an envelope, on the amplitude component data. Further, an envelope ring pattern embedding means 903 embeds digital watermark information at predetermined positions on the line. Then, an inverse Fourier transformer 904 computes the inverse frequency transforms of the amplitude component data embedded with the digital watermark information by using the phase component data. COPYRIGHT: (C)2003,JPO
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