Information Technology Journal1812-56381812-5646Asian Network for Scientific Information10.3923/itj.2010.1653.1658JarjesAnn A. WangKuanquan J. MohammedGhassan 8201098Accurate pupil contour detection plays an important role in iris recognition systems. This study presents a new algorithm for precise pupil segmentation based on Gradient Vector Flow (GVF) snake and the Angular Integral Projection Function (AIPF) and the proposed method has four stages. In the first stage, the iris image is filtered and smoothed. Secondly, the pupil center is estimated as the center of mass of the binarized iris image. Then, the circular pupil boundary is localized by applying the AIPF followed by circle fitting. In the final stage, the precise pupil contour is detected using GVF snake initialized on the detected circular pupil boundary. Experimental results obtained by applying the proposed algorithm on CASIA V3.0 iris image database, demonstrate that the presented method has improved both the accuracy and speed of iris localization.]]>Abrantes, A.J. and J.S. Marques,1996CASIA,2006Cohen, L.D.,1991Daugman, J.G.,1993Daugman, J.,2004Davatzikos, C. and J. Prince,1995Kass, M., A. Witkin and D. Terzopoulos,1988Kong, W. and D. Zhang,2001Ma, L., T. Tan, Y. Wang and D. Zhang,2004Mohammed, G., B. Hong and A. Al-Kazzaz,2010Mohammed, G.J., H.B. Rong and A. Al-Kazzaz,2009Nishino, K. and S.K. Nayar,2004Proenca, H. and L.A. Alexandre,2006Sudha, N., N. Puhan, H. Xia and X. Jiang,2009Tisse, C., L. Martin, L. Torres and M. Robert,2002Wildes, R.P.,1997Williams, D.J. and M. Shah,1992Xu, C. and J.L. Prince,1998Zheng, Z., J. Yang and L. Yang,2005Zuo, J., N. Ratha and J. Connell,2008