一种健壮的指纹方向图校正算法  

Robust algrithm for adjustment of fingerprint directional image

作　　者：陈若珠[1] 田守军[1] 李战明[1] 吕强[2] 

机构地区：[1]兰州理工大学电气工程与信息工程学院,兰州730050 [2]长庆油田公司通信处,西安710021

出　　处：《电子测量技术》2009年第2期143-146,共4页Electronic Measurement Technology

摘　　要：指纹方向图的校正困难在两个方面,第一如何找到有误方向,第二如何制定修改方向的规则。提出一种指纹方向图评估与校正算法,该算法提出了方向可靠性的概念,在梯度方向场上定量计算方向一致性,结合可靠性和方向一致性确定校正规则。与已有的方向校正算法对比,本文算法能够校正大块错误方向,抗噪声性能较强,是一种健壮的方向校正算法。Two difficulties lie in fingerprint directional image adjustment, the first is how to find false direction, the second is how to establish rules to correct the direction, in this paper we proposed an algrithm for adjustment of fingerprint directional image, the notation of direction reliability will be used in the algorithm, base on gradient orientation field, we quantificationally compute the orientation coherence, Combined with the reliability and consistency we establish the rules for correcting. Compared with the previous algorithms, the proposed method can deal with larger block of false direction and more robust against noise.

关 键 词：方向场 方向图 方向一致性 方向可靠度 

分 类 号：TP2[自动化与计算机技术—检测技术与自动化装置]