指纹图像增强算法研究.docx
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指纹图像增强算法研究
学号14072202205毕业设计(论文)题目:
指纹图像增强算法研究靳志恒2011届作者届别信息与通信工程学院电子信息工程学院专业XXXXX指导教师职称2011年5月完成时间
湖南理工学院毕业设计(论文)摘要指纹图像的质量相对于指纹识别而言非常关键,但实际操作中获取到的图像往往包含各种噪声.比如伤疤、汗渍、污迹以及与指纹采集设备的不均匀接触.本文在前人的基础上提出了一套基于Matlab实现的指纹指纹增强算法.用gabor滤波实现指纹图像的增强,由于Gabor滤波器可以同时在空域和频域上获得最佳的分辨率,具有良好的带通性和方向选择性,可以采用Gabor滤波器来实现指纹图像的增强.本文给出了用Matlab实现对每个指纹图像处理功能模块的算法,以及改进方法及处理结果,主要包括分割、归一化、增强和细化等.用Matlab现的这种方法,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处理算法的效果,有效配合了算法的研究.实验证明,用Matlab实现的算法处理结果比较理想,满足识别的应用性.:
关键词指纹图像增强;Matlab分割细化
湖南理工学院毕业设计(论文)ABSTRACTThequalityofthefingerprintimagerelativetothefingerprintidentificationisverycrucial,buttheactualoperationoftheimageobtainedtheusuallycontainvariousnoise.Suchasscar,sweatstains,dirtandfingerprintsacquisitiondevice.InpreviousunevencontactareputforwardonthebasisofasetofbasedonMatlabfingerprintfingerprintenhancementalgorithm.GaborfilteringwithfingerprintimageenhancementrealizationarepresentedinthispaperMatlabtoeachfingerprintimageprocessingfunctionmodulesofthealgorithm,improvementmethodsandhandlingresults,mainlyincludingsegmentation,normalization,enhanceandfineturnetc.Matlabthisway,canthefingerprintimagepreprocessingalgorithmbysimulationtesting,andcanbeveryintuitivetoseetheeffectofimageprocessingalgorithm,thealgorithmofeffectivecooperation.Experimentalproof,Matlabalgorithmprocessingresultsareideal,satisfyrecognitionapplied.Keywordsfingerprintimageenhancement;Matlab;Segmentation;refining:
湖南理工学院毕业设计(论文)摘要................................................................................................................................2ABSTRACT........................................................................................................................31引言.........................................................................................................................51.1生物特征识别........................................................................................51.2指纹特征................................................................................................61.3指纹识别研究进展................................................................................71.4论文的工作任务和准备解决的关键问题..............................................81.4.1论文的工作内容...........................................................................81.4.2准备解决的关键问题....................................................................92指纹图像处理过程...............................................................................................92.1指纹图像的规格化................................................................................92.2指纹图像处理方法概述......................................................................102.3指纹图像场方向的计算.....................................................................122.3.1指纹图像方向图的计算..........................................................122.3.2指纹图像方向场的平滑...........................................................132.3.3求指纹纹线平均频率...............................................................14...................................................................................................................152.4指纹模式域与背景区域的分割.........................................................152.5指纹图像的二值化.............................................................................162.6小结.......................................................................................................173Matlab简要介绍...................................................................................................183.1Matlab的应用....................................................................................183.2Matlab的特点...................................................................................194基于Gabor滤波器的指纹图像增强算法............................................................204.1用固定纹线频率滤波.........................................................................224.2对指纹核心区域的Gabor算法改进................................................234.3实验结果与相关分析.........................................................................245总结.........................................................................................................................25参考文献......................................................................................................................26致谢..........................................................................................................................27附录..............................................................................................................................28.......................................................................................................................28
湖南理工学院毕业设计(论文)1引言1.1生物特征识别能被称之为生物特征的必须具有这样几个性质:
唯一性和不变性。
唯一性是指生物的不同个体的相应特征是不同的并且是可以加以区别的。
不变性是指