By comparison the iris pattern of non contact type sensor for extraction of eye. Iris has both life does not change due to the healthy part and change some Asians becausesmall pupils, not suitable for this method. Eyes before putting things cause psychological uneasiness.
Eye iris patterns extracted by the non-contact sensor for comparison. Iris part of both life and non-Bian Bian due to health status of the Asian part because of the pupil is small, this method is not appropriate. Put something before the eyes caused by psychological unease.
Sweep the two-dimensional code