To enhance the collation accuracy in a fingerprint collation by correcting an extracted feature value even in the input of a fingerprint image with indistinct contrast.
To determine the dispersion of feature value, the variance of LPC cepstrum obtained in feature extracting processing, is calculated (S70) and a compensation coefficient Wn obtained by determining the inverse of the variance value is calculated (S71). To surely enhance the collation rate, a filter for suppressing excessive components of a high-order part is calculated (S72), the filter is multiplied by the compensation coefficient to determine a weight coefficient (S73), and the feature value is corrected by use of the weight coefficient (S74). The fingerprint collation is performed on the basis of the corrected feature value.
MIYOSHINO KENJI
UME TECH KK
JPH1091769A | 1998-04-10 | |||
JP2000259825A | 2000-09-22 |