关键词: 虹膜定位, 活动轮廓, Snake模型, GAC模型

Abstract: In order to improve the accuracy and reliability of iris location，this paper uses the improved Snake model and the improved GAC model to locate the inner and outer edge of the iris. On the basis of the traditional Snake model，the GVF force field is used to replace the traditional external force field to locate the inner edge of the iris. On the basis of the traditional GAC model，the non negative constant term is introduced as an evolutionary contraction force，which makes the direction of?the object inside，and realizes the location of iris outer edge by GAC model. A large number of experiments are carried out using CASIA iris database. The results show that the method is faster，more accurate positioning，stronger in restraining noise than the classical iris localization algorithm.

Key words: iris location, active contour, Snake model, GAC model