摘要
一般而言,在采集到的指纹灰度图像中均含有大量噪声,而指纹识别技术在很大程度上依赖于指纹图像的质量,所以对指纹图像中的伪信息要加以滤除。在指纹的预处理阶段,利用多种方法可有效地去除图像中的大部分伪信息。在二值化过程中充分考虑指纹脊线的特性,利用指纹图像中点梯度的方向信息,提出了用相位编组法确定块方向,然后基于块方向进行方向滤波,收到了较好的效果。
There is much noise in the collected fingerprint gray scale images.But fingerprint recognition techniques largely depend on the quality of the fingerprint image.It is necessary to filter the fake information of fingerprint image.At the stage of the pre-process of the fingerprint image,this paper makes use of some good methods and effectively gets rid of the most fake information.And in this paper,we use the information of the pixel's grads which in the fingerprint's digital image and propose an approach that we can confirm the block's orientation.Then we design a filter along the orientation,which works well.
出处
《天津职业技术师范学院学报》
2004年第4期26-29,共4页
Journal of Tianjin Vocational Technical Teachers'college
关键词
指纹
识别
图像处理
滤波
fringerprint
recognition
image processing
filter
