Abstract:

A new algorithm for iris localization was proposed on the basis of contour following, and the new algorithm improved the realtime and accuracy of iris localization. Firstly, the algorithm scans the input binary iris image to find out the start point of the contour. Then after a series of procedures
of contour finding, contour coding and contour filtering, the iris inner contour is located. Finally, the radius of iris outer contour  is got by calculating the average distance between the center of inner contour and gray catastrophe points which are located at outer contour of iris and sclera. This algorithm was testified by JLUIRIS and CASIA iris database, and the results were satisfied. Experimental results show that the proposed algorithm can improve the speed and accuracy, and is further more stable.

Key words: iris recognition, iris localization, contour following