Identity verification using complex representations of the handwritten signature

This paper is devoted to a handwritten signature verification using the cross-correlation approach (adopted by the authors from telecommunications) and dynamic time warping. The following invariants of the handwritten signature: net signature, instantaneous complex frequency and complex cepstrum, are analyzed. The problem of setting the threshold for deciding whether the current signature is authentic or forged is discussed. The database of 3400 signatures collected for the First International Signature Verification Competition (SVC) 2004 purposes is exploited. The obtained results are compared with those derived during the SVC 2004.