一种手臂静脉特征提取与匹配的算法

An Algorithm for Feature Extraction and Matching of Arm Veins

针对手臂静脉这一全新的生物特征提出一种特征提取及匹配的算法。首先利用限制对比度自适应直方图均衡化方法对近红外图像进行对比度调整,接着利用Gabor滤波器提取静脉,并进行方向和尺度的标准化;在曲线修复和分割的基础上,提取描述曲线段的方向特征、位置特征和描述曲线形状的Hu不变矩特征;然后搜索匹配曲线对,并利用粒子群算法计算最优空间变换关系,最后进行静脉的匹配。针对150人数据库的匹配实验结果表明,该算法的识别率优于其他方法,说明手臂静脉作为一种新的生物特征具有良好的应用前景。

A feature extraction and matching algorithm is proposed for arm veins. Firstly, the contrast of near infrared （NIR） images is adjusted using the contrast limited adaptive histogram equalization （CLAHE） method. Then the Gabor filters are adopted to extract veins. The orientation and scale of veins are normalized, and the renovation and segmentation of veins are performed. For each curve segment, the direction, position and Hu invariant moment features are extracted. Matching curve pairs are searched, and the optimal space transformation is calculated using the particle swarm optimization （PSO） method. Finally the veins are matched. The algorithm is evaluated in a database of arm vein images collected from 150 people. The experimental results show that the matching accuracy is better than other methods, which indicates that arm veins owe a good application prospect.