1、 I 毕业设计(论文)毕业设计(论文) 题 目 指纹图像的相干滤波增强系统设计 院 (系) 电气与信息工程学院 专业班级 学生姓名 学号 指导教师 职称 评阅教师 职称 2015 年 5 月 22 日 II 摘 要 随着信息化社会的不断发展,人们对身份的认证方式不仅仅局限于签章、信 物、口令等,指纹识别技术也越来越被人们广泛应用。由于指纹的独特性和唯一 性,更有效的解决了传统认证方式容易丢失、伪造、复制的缺点。而指纹识别率 的高低主要取决于采集的指纹图像的质量,然而采集的指纹图像包含各种噪声, 如汗渍、伤疤、污迹等,因此需要对收集的指纹图像进行预处理来提高指纹识别 率。本文主要研究的是指纹图像
2、预处理中指纹滤波增强的部分,特别是应用偏微 分方程中的相干滤波进行指纹图像增强。 本文首先总结了指纹图像滤波增强的常见方法,列举了线性滤波方法中的均 值滤波和高斯滤波以及非线性滤波方法中的中值滤波,并分析了它们的优缺点。 然后介绍了偏微分方程用于图像滤波的基本方法,线性扩散和非线性扩散,最后 引导出相干滤波增强的指纹图像处理方法。并通过 MATLAB 软件设计图像滤波界 面,对收集的指纹图像进行滤波,最后在图形用户界面显示图像滤波后的实验结 果。 关键词:指纹识别 图像滤波 偏微分方程 非线性扩散 III II ABSTRACT And level of the fingerprint rec
3、ognition are mainly depends on the quality of the fingerprint image acquisition, the acquisition of fingerprint image contains all kinds of noise, however, such as perspiration, scar, stains, etc., so need to collect the fingerprint image preprocessing to improve fingerprint recognition rate. This p
4、aper mainly studies the fingerprint filtering enhancement part of fingerprint image preprocessing, especially the coherent filtering in the application of partial differential equation for fingerprint image enhancement. This article first summarizes the common methods of fingerprint image filtering
5、enhancement, enumerates the linear filtering method of mean filter and gaussian filtering and nonlinear filtering method of median filter, and analyzed their advantages and disadvantages. And then introduces the basic method of partial differential equation for image filtering, linear and nonlinear
6、diffusion, finally lead to coherent filtering enhancement method for fingerprint image processing. Interface and through the MATLAB software to design the image filtering, to collect the fingerprint image filtering, the last in a graphical user interface to show the image filter after the experimental results. Key words: fingerprint recognition image filtering partial differe