Title :
A new autofocus method used in portable iris image acquisition system
Author :
Huang, Wanfeng ; Lin, Xirong ; Ma, Jintao
Author_Institution :
Dept. of Precision Instrum. & Mechnology, Tsinghua Univ., Beijing, China
Abstract :
A new auto focus method which is based on dispersion circle is proposed in an iris acquisition system. Combining with lattice infrared source and reliable coarse pupil location algorithm, the introduced method not only has good performance in unimodality and sensitivity, but also has obvious advantage in real-time processing. The average single image processing time is less than one millisecond.
Keywords :
infrared imaging; iris recognition; optical focusing; autofocus method; coarse pupil location algorithm; dispersion circle; image processing time; lattice infrared source; portable iris image acquisition system; real-time processing; Dispersion; Focusing; Gray-scale; Image quality; Iris recognition; Light sources; Sensitivity; Iris acquisition; autofocus; definition evaluation; dispersion circle; pupil location;
Conference_Titel :
Image and Signal Processing (CISP), 2010 3rd International Congress on
Conference_Location :
Yantai
Print_ISBN :
978-1-4244-6513-2
DOI :
10.1109/CISP.2010.5648180
