Effect of pupil dilation and constriction on the distribution of bit errors within the iris

Tomeo-Reyes, Inmaculada & Chandran, Vinod (2014) Effect of pupil dilation and constriction on the distribution of bit errors within the iris. In IEEE Conference on Computer Vision and Pattern Recognition, 23-28 June 2014, Columbus, Ohio.

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Texture information in the iris image is not uniform in discriminatory information content for biometric identity verification. The bits in an iris code obtained from the image differ in their consistency from one sample to another for the same identity. In this work, errors in bit strings are systematically analysed in order to investigate the effect of light-induced and drug-induced pupil dilation and constriction on the consistency of iris texture information. The statistics of bit errors are computed for client and impostor distributions as functions of radius and angle. Under normal conditions, a V-shaped radial trend of decreasing bit errors towards the central region of the iris is obtained for client matching, and it is observed that the distribution of errors as a function of angle is uniform. When iris images are affected by pupil dilation or constriction the radial distribution of bit errors is altered. A decreasing trend from the pupil outwards is observed for constriction, whereas a more uniform trend is observed for dilation. The main increase in bit errors occurs closer to the pupil in both cases.

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ID Code: 74123
Item Type: Conference Paper
Refereed: Yes
Additional URLs:
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 [please consult the author]
Deposited On: 17 Jul 2014 23:14
Last Modified: 07 Aug 2014 15:00

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