【摘要】 目的提出了一种基于改进Hough变换(HT)的虹膜定位算法,解决标准HT定位虹膜计算量较大,且定位不准确的问题.方法根据虹膜的形状和圆近似的性质,用改进的圆HT定位虹膜,定位时采用点对和梯度信息确定潜在的虹膜中心和对应的圆半径.为了使输出结果仅为虹膜的外边界,定义了一个阈值.结果采用点对和梯度信息并定义相应的阈值定位虹膜,在较大程度上减少了计算量,并且保证输出结果为虹膜的外边界.结论采用改进HT能以较小的计算代价准确地定位虹膜.更多还原

【Abstract】 A modified Hough Transformation algorithm is proposed for iris location in gray image.In iris location system,the outer boundary of a typical iris can approximately be taken as acircle,so the circles of iris can be obtained by using HT.Our algorithm uses point-pairs and gradient information to locate circles.A threshold is defined to ensure that the output is the outer contour of iris.Experiment results show that the modified algorithm can decrease algorithm complexity and locate iris accurately.更多还原