Improved algorithm for fingerprint segmentation based on variance and its gradient
CAI Xiu-mei 1,FAN Jiu-lun 1,GAO Xin-bo 2,ZHANG Yong-jian 3
Computer Engineering and Applications . 2010, (1): 177 -179 .  DOI: 10.3778/j.issn.1002-8331.2010.01.052