基于神经网络的指纹识别

西北民族大学2011级毕业论文基于神经网络的指纹识别年级:2011级学号:姓名:专业:自动化指导老师:二零一五年五月西北民族大学本科毕业设计第II页共26页摘要随着科学技术的发展，信息安全逐渐被人们所重视，指纹识别技术因其唯一性和安全性逐渐进入了人们的视野，并广泛应用于刑事侦查、设备安全和个人信息等诸多领域。在本文中对指纹图像的必要步骤进行了分析，对指纹图像的预处理，剔除指纹图像中可能存在的伪特征点，对指纹图像的特征提取，将提取的指纹特征训练神经网络，利用神经网络技术对指纹的特征进行识别。本文将BP神经网络和RBF神经网络对指纹识别的结果进行对比，比较两种方法在指纹识别上的性能，利用Matlab软件对该方法进行了实验验证。结果表明RBF神经网络在指纹识别方面比BP神经网络拥有更好的泛化性能。关键词：指纹识别；特征提取；神经网络西北民族大学本科毕业设计第III页共26页AbstractTheinformationsecurityispaidgreatattentiontopeoplewiththedevelopmentofscienceandtechnology,andthefingerprintrecognitiontechnologyenteredpeople'svisiongraduallywithit’suniqueness,andsecurity.Itiswidelyusedincriminalinvestigations,equipmentsafetyandpersonalinformation,andsoon.Inthispaper,thevariousstepsoffingerprintrecognitionare:preprocessingoffingerprintimages,thepossibleexistenceofburrorpseudofeaturepointsareeliminatedinthefingerprintimage,thefingerprintimagerotationandtranslationafterthefeatureextraction,fingerprintfeatureextractionastheinputvectorofneuralnetworktoidentifytheinputvector,usingthetechnologyofneuralnetwork.ThispapercomparestheresultsofBPneuralnetworkandRBFneuralnetworkforfingerprintrecognition,aperformancecomparisonoftwomethodsinfingerprintrecognition,themethodisverifiedbyusingMatlabsoftware.TheresultsshowthattheRBFneuralnetworkinthefieldoffingerprintrecognitionhasbetterperformancethanBPneuralnetwork.Keywords：fingerprintidentification;featureextraction;neuralnetwork西北民族大学本科毕业设计第IV页共26页目录摘要..............................................................................................................................IIABSTRACT.........................................................................................................................III第1章绪论.....................................................................................................................11.1指纹识别技术简介..............................................................................................11.2指纹识别的研究背景及现状..............................................................................11.3本文主要研究内容..............................................................................................21.4本章小结..............................................................................................................2第2章指纹的预处理.......................................................................................................32.1维纳自适应滤波......................................................................................................32.2SOBEL算子锐化.......................................................................................................42.3二值化算法..............................................................................................................52.4细化算法..................................................................................................................62.5本章小结..................................................................................................................6第3章指纹的特征提取...................................................................................................73.1指纹分类特征..........................................................................................................73.1.1全局特征.......................................................................................................73.1.2局部特征.......................................................................................................83.2分类特征提取..........................................................................................................83.2.1细节特征点提取...........................................................................................83.2.2极坐标特征转换...........................................................................................93.3本章小结................................................................................................................10第4章基于神经网络的方案设计.................................................................................114.1神经网络简介........................................................................................................114.2基于BP神经网络的指纹识别.............................................................................114.2.1BP神经网络结构.........................................................................................114.2.2BP神经网络的训练.....................................................................................124.2.3实验结果及结论.........................................................................................134.3基于RBF神经网络的指纹识别..........................................................................154.3.1实验结果及结论.........................................................................................154.4BP神经网络与RBF神经网络对比.....................................................................164.5本章小结................................................................................................................17西北民族大学本科毕业设计第V页共26页结论...................................................................................................................................