Study on Algorithm for Iris Image Inner and Outer Boundaries Location
Jian Zhang · Communications technology · 2010
Iris location is an important part of iris recognition process,and its speed and accuracy determines the performance of iris recognition system.The precise iris location is the premise of iris recognition,and thus an effective iris terse location algorithm is of the utmost importance.Based on study and analysis of the existing iris location algorithm and aiming at the limitation of the existing iris algorithm,a new method to localize the iris is proposed.First,the iris image structure and gradation distribution is analyzed in terms of iris image gradation histogram,and the pupil is separated with the binaryzation method.The inflation and erosion of mathematics morphology method is used to locate the inside of the edge by defining the center and radius of the pupil.The apriori knowledge of iris location is used to reduce the search range and locate outside edge of the iris image with the morphology algorithm in combination of the new hough transform.The method of edge detection based on mathematical morphology and new Hough transform is used to locate the outer edge of the iris,thus the center and raduis of outer annulus is obtained.The experimental results show that this algorithm is effective and feasible.