Title :
Non-ideal iris segmentation using anisotropic diffusion
Author :
Hong-Lin Wan ; Zhi-Cheng Li ; Jian-Ping Qiao ; Bao-Sheng Li
Author_Institution :
Sch. of Phys. & Electron. Sci., Shandong Normal Univ., Ji´nan, China
Abstract :
Iris segmentation is critical for iris recognition. In this study, the authors present a circle-based iris segmentation method for non-ideally captured iris by employing anisotropic diffusion. Our proposal consists of two component steps by which interior and exterior boundaries are localised, respectively. To save computational load, Laplace pyramid (LP) framework is incorporated into both steps. During the first step, when iris has been decomposed into the coarse level by LP, reflections will be removed by anisotropic diffusion and morphologic operations. In the second step, the authors present the innovated curve evolution to detect exterior boundary. Moreover, order statistical filters are employed to enhance the contrast of iris and sclera. Experimental results depict a high correct ratio of segmentation that is more than 96.90% thereby validating the proposed approach.
Keywords :
image segmentation; iris recognition; Laplace pyramid framework; anisotropic diffusion; circle-based iris segmentation method; computational load; curve evolution; iris recognition; morphologic operations; nonideal iris segmentation; nonideally captured iris; order statistical filters; sclera;
Journal_Title :
Image Processing, IET
DOI :
10.1049/iet-ipr.2012.0084