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三次B样条曲线拟合的虹膜定位
引用本文:叶永强,沈建新,周啸,张敏.三次B样条曲线拟合的虹膜定位[J].小型微型计算机系统,2011,32(9).
作者姓名:叶永强  沈建新  周啸  张敏
作者单位:1. 南京航空航天大学机电学院,南京,210016
2. 四川大学华西口腔医学院,成都,610041
基金项目:教育部“新世纪优秀人才支持计划”项目(NCET-06-0502)资助; 江苏省“333工程”项目(2007-16-59)资助
摘    要:采用圆检测定位虹膜内外边界的方法是当前虹膜定位的主流算法.当虹膜图像分辨率很高时,圆曲线不能准确地拟合虹膜真实边界,特别是受瞳孔收缩影响很大的内边界.而采用三次B样条曲线能够很好地拟合内边界.为了提高定位效率,首先运用质心探测方法分割出瞳孔区域,然后在瞳孔区域中搜索内边界点,采用三次B样条曲线精确拟合内边界;最后利用Canny算子检测外边界,并采用圆曲线的最小二乘拟合外边界.运用Bath大学虹膜库中的1000幅虹膜图像对该定位算法进行测试,内边界定位时间0.0203s、准确率99.2%;外边界定位时间2.0277s,准确率98.9%,满足准确、高效的定位要求.

关 键 词:虹膜定位  质心探测  三次B样条曲线  最小二乘拟合

Iris Localization Algorithm Based on Cubic B-spline Curve Fitting
YE Yong-qiang , SHEN Jian-xin , ZHOU Xiao , ZHANG Min.Iris Localization Algorithm Based on Cubic B-spline Curve Fitting[J].Mini-micro Systems,2011,32(9).
Authors:YE Yong-qiang  SHEN Jian-xin  ZHOU Xiao  ZHANG Min
Affiliation:YE Yong-qiang1,SHEN Jian-xin1,ZHOU Xiao1,ZHANG Min2 1(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics & Astronautics,Nanjing 210016,China)2(West China College of Stomatology,Sichuan University,Chengdu 610041,China)
Abstract:The current important methods of iris localization are based on circle detection.But they could not fit the real boundary well when iris images are high-resolution,especially the inner boundary under the influence of pupil constriction.Proposed method based on cubic B-spline curve can figure out this problem.It locates the inner boundary area first,and then the outer boundary.To improve the efficiency and robustness for inner boundary localization,this paper has proposed a method to segment the pupil area f...
Keywords:iris localization  centroid detection  cubic B-spline curve  least-square fitting  
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