| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sign authentication system and sign authentication method for authenticating the originality of an object having a sign such as a seal or a signature which is deemed as a sign, making counterfeit very difficult even if the mechanism of authentication is revealed, and obviating the need for being additionally provided with a special device such as an IC chip used for authenticating the originality. Ž<P>SOLUTION: The sign authentication system includes reading means for reading a sign such as a seal as color information by mesh division, feature point extracting means for extracting feature points from the color information and storing them, and code creating means for creating a code for authentication from the feature points. The sign is made with an ink containing color material particles smaller than the mesh division. The feature point extracting means is determined on the basis of variation of color information caused when the mesh division is shifted. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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