指纹图像预处理.docx

目 录摘要IIAbstractIII第一章 概述11.1 指纹及其识别11.2 指纹识别算法概述11.3采集指纹图像的技术21.4 指纹预处理31.5 指纹图像预处理过程及一般算法41.6特征拾取、验证和辨识51.7 指纹识别的主要应用51.8本次设计的任务要求7第二章 设计方案82．1 平滑处理82，1．1 增强对比度82．1．2 指纹图像规格化和滤波82．2 锐化处理92．3 二值化102.4 细化112.5 特征值的提取122.6 伪特征点的去除132.7本章小结14第三章 MATLAB软件设计153.1MATLAB的简介153.2 程序调试173.2.1设计思路173.3图像处理183.4本章小结27结束语28致 谢29参考文献30 摘要 指纹图像预处理是指纹识别的前提,它的好坏直接影响到指纹识别的成败，但由于指纹图像降质带来的困难,并根据指纹图像的特征提出了合理的假设，再根据假设提出了增强指纹图像对比度的算法、提取指纹有效区域的算法、根据方向信息分割图像的算法以及去除图像中气泡噪声的算法，这些算法处理效果好，能有效地解决指纹图像的预处理问题。 用Matlab实现这种方法，既能分步对指纹图像预处理算法进行仿真测试，又可以很直观地看到图像预处理算法的效果。实验证明，用Matlab实现的处理结果比较理想，满足识别的应用性。本文介绍用matlab实现了指纹图像的对比度增强、有效区域的选取、指纹图像的二值化、指纹的特征值提取等。并选取较好的处理步骤和算法参数解决指纹图像预处理的问题。 关键字 指纹图像预处理，二值化，对比度，特征点提取 AbstractFingerprint image pre-processing is a prerequisite of fingerprint recognition, it will have a direct impact on the success of fingerprint recognition, fingerprint image degradation because of the difficulties caused by the characteristics of fingerprint images based on reasonable assumptions made, and made under the assumption that contrast enhancement algorithm for fingerprint images, fingerprint extraction algorithm effective area, according to the direction of the image segmentation algorithm and the information to remove noise in the image bubble algorithms deal with the effect, It can effectively solve the problem of fingerprint image preprocessing. Every part of fingerprint images preprocessing algorithms can be simulated and testd by matlab，and the effect of images processing algorithms can be observed intuitively．The experimental results show that Matlab can get ideal processing result，and can meet the requirement of recognition．We introduce the use of matlab to achieve a fingerprint image contrast enhancement, the effective selection of the region, the fingerprint image binarization in this text. And to select the best of processing steps and algorithm parameters to solve the fingerprint image pre-processing problems. Key word Fingerprint image preprocessing，Binarization，