摘要
针对静脉特征图像中静脉边缘和末梢模糊造成匹配困难的问题,提出了一种基于三值模板图像的模糊匹配方法。该方法将提取出的静脉特征图像分割为三值图像,值1代表目标区,0.5代表模糊区,0代表背景区。三值图像用于模板匹配时,计算模板间非0值区域之间的平均距离作为相似分数,分数越低,则模板越相似。该方法匹配能力强,不要求点与点之间的绝对位置匹配,对模糊的静脉边缘和末梢匹配具有较强的鲁棒性。对实验中采集的456张近红外手指静脉图像进行匹配,正确识别率达99.46%,表明本文方法是可行的和有效的。
In order to reduce the effect of fuzzy edges and tips of vein feature image in the template matching,we present a tri-value template fuzzy match algorithm,which segments the vein feature image into three areas: subject area,fuzzy area and background area;compute the average distance between the non-background areas as the similarity score between the matching templates.It is robust against the fuzzy edges and tips by increase the distance norm to the fuzzy area.The recognition accuracy rate,99.46%,to 456 near-infrared finger vein images,shows that our proposed method is feasible and practical.
出处
《武汉大学学报(信息科学版)》
EI
CSCD
北大核心
2011年第2期157-162,共6页
Geomatics and Information Science of Wuhan University
基金
国家自然科学基金资助项目(40571102)
关键词
近红外手指静脉识别
三值模板
模糊匹配
infrared finger vein recognition
tri-value template
fuzzy matching