Apparatus for verifying an online signature using of transform technique and method teherefor

PURPOSE: An online sign certification device using a pattern transform method and a realizing method thereof are provided to confirm an ID of a signer and enhance discrimination for a forged sign by analyzing a characteristic of a transform pattern visualizing a dynamic characteristic of a sign pattern. CONSTITUTION: A sign data input part(100) reads a locus of the sign as a sequence sampled in the same time interval by digitalizing the locus of the sign from a reference sign database(106). The first and the second pattern transformer(101,102) generate a transformed pattern sequence by respectively performing speed equalization and velocity transform for the read sign sequence. A characteristic extractor(104) generates three pairs of characteristic vectors by respectively extracting the characteristic vector from the read sign sequence and the pattern sequence transformed by the first/second pattern transformer. A difference vector calculator(108) generates a difference vector between the characteristic vector for a reference sign and the extracted characteristic vector. A judging part(110) judges accordance between the input sign and the reference by based on the difference vector.