在眼睛最外层起保护作用的薄膜是角膜。光线通过这层薄膜后，就进入了虹膜。
The protective bit at the front of the eye is the cornea and once light passes through this membrane, it passes through the iris.
在数据库中有记录的孩子走失被找回后，扫描虹膜便可迅速确定其身份，比DNA身份核验更加快捷。
If a child who is registered on the database goes missing and is found, an iris scan will be able to quickly determine his or her identity, much faster than DNA identification.
最后对定位后的虹膜图像进行了归一化。
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