瞳孔位置
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After finding parameter of coarse location, the inner and outer circle can be got based on the parameter because the circle of pupil and circle of iris nearly have the same center.
采用二值化的方法获得瞳孔的粗定位的参数后，由于瞳孔和虹膜的外边缘近视为同心圆，该参数可用作提取虹膜外边缘的基础。
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