在虹膜识别中,常见的情况就是虹膜信息的不完整,许多文献已经表明在虹膜信息完全的情况下,虹膜的模式是唯一的,模式之间具有差异性,能够通过它的独立特征数来表示模式之间的可分性。但是实际中,虹膜模式受到的影响导致了虹膜模式的信息不完全,有的甚至只有很少的虹膜区域,究竟在小区域内虹膜是否还具有特征的唯一性,是虹曦识剐能否实际应用需要考虑的问题。研究结果表明,部分虹膜区域仍具有相当多的独立特征,但随着虹膜区域的减小。错误拒绝率会增加。
In iris recognition system, iris region is generally incomplete, many literatures have shown that iris feature have uniqueness for complete iris region. Free-feature number can indicate pattern-separability. In fact, the iris regions usually are incompletely in iris recognition process, even if there is part of iris region in some images. Whether or not there is pattern uniqueness in small iris regions is valuable studying for iris recognition. Research results show that there is still enough features in part of iris pattern and false reject rate will increase with iris regions decreasing.