Patent ID: 7454042

Claim:
An apparatus for online signature verification using a reference signature database (DB), the apparatus comprising: a signature data input unit for digitalizing a locus of a user's input signature and reading the digitized locus as a signature sequence of sample points sampled at regular time intervals; a first pattern transform unit for performing a speed equalization on the signature sequence read by the signature data input unit and generating a first transformed pattern sequence, wherein said speed equalization is based on the assumption that linear velocities at the sample points on the locus are equal to a constant value; a second pattern transform unit for performing a velocity transformation on the signature sequence read by the signature data input unit and generating a second transformed pattern sequence; a feature extraction unit for extracting a characteristics vector from the signature sequence, the first transformed pattern sequence and the second transformed pattern sequence; a difference vector estimation unit for generating a difference vector between a feature vector of the user's reference signature read from the reference signature DB and the characteristics vector extracted by the feature extraction unit; and a determination unit for determining whether the input signature and the reference signature are signed by the same person or not, based on the difference vector generated from the difference vector estimation unit.