为了提高虹膜定位的速度以及虹膜定位算法的健壮性,提出了一种粗定位与精定位相结合的两步定位法,用以进行虹膜定位,并对现有的虹膜定位算法进行了一些改进。实验结果表明,用两步法进行虹膜定位可以加快定位速度,减少搜索计算的盲目性。

A two-step location approach combining coarse location with fine location is presented, and an extant iris location algorithm is improved in order to fasten the speed of iris location and make the iris location algorithm more robust. Grey scale projection approach is used for the coarse iris location and a kind of dynamic circular edge template is adopted by the fine iris location. Experiments show that the method has good performance of sub-pixel precision and about 1 second on speed compared with 3~5 seconds by the original iris location method. The two-step location approach can fasten location speed and decrease the blindness of search computation, and the improved iris location algorithm is reasonably more robust than the original one.