虹膜图像预处理的研究  

Research on Iris Image Preprocessing

作　　者：孙树亮[1] 曾森森[1] 苏治红 王伟杰[1] 林滟 

机构地区：[1]福建师范大学福清分校数学与计算机科学系,福建福清350300

出　　处：《福建师大福清分校学报》2014年第2期17-20,共4页Journal of Fuqing Branch of Fujian Normal University

基　　金：大学生创新项目(sjcxcy-20421323)

摘　　要：本文首先采用形态学对瞳孔进行定位,分割出瞳孔以后,对虹膜进行内外边缘的检测。对外边缘的定位首先采用梯度算子检测边缘,然后用Hough变换进行虹膜定位。由于上下眼皮会部分地遮挡虹膜顶端和底端,因此定位虹膜的时候,以瞳孔为中心,截取-π/4～π/4及3π/4～5π/4的虹膜区域作为研究对象。最后对图像归一化的方法用极坐标变换。实验结果证明该方法的有效性。Morphology is employed in this paper for the positioning of pupil; after pupil segmentation, the inner and outer edges of the iris are examined; first, gradient operator is adopted to examine the edges of iris; then Hough Transformation is employed to position the iris. Since upper and lower eyelid will partly blur the top and bottom of iris, when positioning iris, the pupil is taken as the centre,-π/4～ π/4 and 3π/4～5π/4 of the iris are singled out as the research objectives; Finally, image normalization is used for polar coordinates transformation. The results show that this method is valid.

关 键 词：形态学 HOUGH变换 归一化 极坐标变换 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]