多尺度复数滤波器及PI值相结合的奇异点检测  

Singularity detection by combining multi-scale complex filter and Poincare Index

作　　者：王唐宇 周丽萍[2] 李海燕[1] 余鹏飞[1] 陈建华[1] 张榆锋[1] WANG Tang-yu;ZHOU Li-ping;LI Hai-yan;YU Peng-fei;CHEN Jian-hua;ZHANG Yu-feng(School of Information Science and Engineering,Yunnan University, Kunming 650040, China;Journal of Yunnan University ： Natural Sciences Edition, Yunnan University, Kunming 650040, China)

机构地区：[1]云南大学信息学院,云南昆明650500 [2]云南大学学报(自然科学版)编辑部,云南昆明650500

出　　处：《云南大学学报（自然科学版）》2018年第4期652-658,共7页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金(61561050;61462094)

摘　　要：为了有效检测指纹奇异点,提出了一种结合多尺度复数滤波器及PI(Poincare Index)值的奇异点检测算法.首先,计算多个尺度下的指纹图像方向场并对每个尺度的方向场进行复数滤波;其次,计算各个尺度的方向场的中心点和三角点滤波器响应,若响应值是邻域内的极大值且大于某一阈值,则进一步计算PI值,并依据PI值是否满足奇异点判定条件,则将其标记为候选奇异点;最后,将多个尺度下的奇异点进行信息融合,检测出指纹的奇异点.将提出算法和同类算法进行主客观的实验比较,对公用指纹数据库FVC2004DB1检测的实验结果表明:算法能很好地应用于低质量指纹图像中,正确的奇异点检测率为93%,高于同类算法,且检测到的奇异点位置不发生偏移.In order to effectively detect the singularities in fingerprint images, a method combining multiscale complex filter and Poincare Index is proposed.Firstly, the directional fields of the fingerprint image at multiple scales are calculated and the direction field of each scale is filtered by using the complex filter.Subsequently the PI values of the core and delta points whose filtering response are greater than a certain threshold are calculated.The singularities whose PI values satisfy the PI judgment condition are identified as the candidate singularities.Then a coarse scale is gradually shifted to the fine scale to refine and filter the candidate singular points.Finally ,the accurate singular point detection results are reached.The proposed method is subjectively and objectively compared with approaches in literature by using the open fingerprint image database FVC2004DB1.The experimental results verify that the correct singularity detection ratio of the proposed algorithm is 93% ,which is higher than those of the compared methods,indicating the good performance of the proposed method in detecting singularities in poor quality fingerprint images and the accuracy in conserving the genuine singularity location.

关 键 词：指纹图像 奇异点检测 多尺度复数滤波器 PI(Poincare Index)值 

分 类 号：TP391.1[自动化与计算机技术—计算机应用技术]