基于多层次分块的指纹图像二值化方法  

Binary method for fingerprint image based on multi-level block size

作　　者：何晶[1] 范九伦[1] 李利[1] 

机构地区：[1]西安邮电学院信息与控制系,陕西西安710061

出　　处：《计算机工程与设计》2008年第14期3740-3742,共3页Computer Engineering and Design

基　　金：国家自然科学基金项目(60572133)

摘　　要：基于块方向信息的指纹图像二值化方法,其效果主要取决于能否准确的估计指纹图像的块方向图。鉴于在指纹奇异点附近及方向变化较快的脊线、谷线区域,块方向信息很难精确得到,提出了一种多层次分块的指纹图像块方向的求取方法,并把这种方法用于指纹图像的二值化,取得了良好的效果。The effect of the block directional-based binary method for fingerprint image is mainly determined by the estimate accuracy of the block direction. Because in the areas near singular points or in the ridge-valley regions with largely changed directions, it is difficult to obtain the correct directional information, a new method by multi-level blocks is proposed to get the block direction of the fingerprint image, and then used it to binarization of fingerprint image, obtained ideal results.

关 键 词：指纹图像 块方向 二值化 多层次分块 中心点 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]