Robust tracking and remapping of eye appearance with passive computer vision
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)
Fast Iris Segmentation by Rotation Average Analysis of Intensity-Inversed Image
AICI '09 Proceedings of the International Conference on Artificial Intelligence and Computational Intelligence
Robust correspondenceless 3-d iris location for immersive environments
ICIAP'05 Proceedings of the 13th international conference on Image Analysis and Processing
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This paper presents a robust, reliable iris location system for close-up, grey scale images of a single eye. The system is meant as a bootstrap or recovery module for automated iris tracking within medical applications. We model the iris contour with an active ellipse, sensitive to intensity gradients across its perimeter. In this way, we avoid modelling the noisy appearance of the iris (e.g. corneal reflections). The iris–sclera intensity transition is modelled at two spatial scales with Petrou–Kittler optimal ramp filters. The optimal ellipse is identified by a simulated annealing algorithm tuned to the problem characteristics. The system performed accurately and robustly with 327 real images against substantial occlusion levels and varying image quality, subject, eye shape and skin colour.