Encyclopedia of Biometrics

2009 Edition
| Editors: Stan Z. Li, Anil Jain


Reference work entry
DOI: https://doi.org/10.1007/978-0-387-73003-5_519

This is a most widely used iris recognition algorithm as of 2008. This is a version of the Daugman algorithm. It differs from an earlier version, “bowtie,” in the way it handles eyelid (and other) occlusions. The bowtie algorithm analyzed a bowtie shaped section of the iris – two triangular wedges extending to the left and right – that avoided most eyelid occlusion at the expense of throwing away information for eyes that are wide open. Iris2pi attempts to analyze all the iris that can be seen – a full 2π radians if possible. Iris2pi note regions that are occluded or otherwise invalid for biometric identification; it records that information in the biometric template. When two templates are compared, the algorithm only compares regions that have valid data.

 Iris Device

 Iris Encoding and Recognition using Gabor Wavelets

Copyright information

© Springer Science+Business Media, LLC 2009