整个过程基本是对灰度图像和二值模板的形态处理，简单易行。
The whole process is the morphology processing based on the gray-level image and binary mask, and is simple and easy to implement.
第二个模板将所有属性复制到输出中，但省略了属性值。
The second template copies all attributes to the output, except that it ignores the attribute value.
对虹膜区域进行二值化编码，获得虹膜特征模板。
Two-value iris template will be achieved by compare every point of convolve image with zero.
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