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车牌提取系统的设计与实现摘要汽车牌照自动识别系统是制约道路交通智能化的重要因素,包括车牌定位、字符分割和字符识别三个主要部分。本文首先确定车辆牌照在原始图像中的水平位置和垂直位置,从而定位车辆牌照,然后采用局部投影进行字符分割。在字符识别部分,提出了在无特征提取情况下基于支持向量机的车牌字符识别方法。实验结果表明,本文提出的方法具有良好的识别性能。随着公路逐渐普及，我国的公路交通事业发展迅速，所以人工管理方式已经不能满着实际的需要，微电子、通信和计算机技术在交通领域的应用极大地提高了交通管理效率。汽车牌照的自动识别技术已经得到了广泛应用。文章介绍了车牌提取系统使用的关键技术，设计原理，详细设计步骤和系统实现。关键词：车牌提取；图像识别；设计与实现ABSTRACTCarlicenseplatesrecognitionsystemisrestrictedbytheroadtrafficintelligentimportantfactors,includinglicenseplatelocalization,charactersegmentationandcharacterrecognitionthreemainparts.Thispaperfirstdeterminethevehicleplateintheoriginalimagelevelandverticalposition,therebypositioningvehiclelicensing,thenuselocalprojectionforcharactersegment.Incharacterrecognition,andputsforwardthepartwithoutfeatureextractioncasesbasedonsupportvectormachineplatecharacterrecognitionmethod.Experimentalresultsshowthattheproposedmethodhasgoodrecognitionperformance.WiththegrowingpopularityofhighwayinChina,roadtrafficundertakingshavedevelopedrapidly,soartificiallymanagementmodeisnotfilledwithpracticalneeds,microelectronics,communicationsandcomputertechnologyintrafficareasofapplicationgreatlyimprovethetrafficmanagementefficiency.Carlicenceautomaticidentificationtechnologyhasbeenwidelyused.Thisarticleintroducesthelicenseplateextractionsystemsusethedesignprincipleandkeytechnology,detaileddesignstepsandsystemimplementation.Keywords:licenseplateextracted;Imagerecognition;Designandimplementation目录摘要............................................................................................................................1ABSTRACT...................................................................................................................2目录............................................................................................................................31相关技术介绍............................................................................................................41.1MFC(微软基本类库)...................................................................................41.2GDI(图形设备接口)........................................................................................41.3MFC开发软件................................................................................................52设计原理....................................................................................................................52.1系统流程.........................................................................................................52.2总体设计步骤.................................................................................................63详细设计....................................................................................................................73.1预处理及边缘提取.........................................................................................73.1.1图象的采集与转换..............................................................................83.1.2边缘提取..............................................................................................83.2.1牌照区域的定位................................................................................113.2.2牌照区域的分割................................................................................113.2.3车牌进一步处理.................................................................................123.3字符的分割与归一化...................................................................................133.3.1字符分割............................................................................................133.3.2字符归一化........................................................................................143.4字符的识别...................................................................................................144关键代码..................................................................................................................164.1图像灰度化...................................................................................................164.2灰度均衡化...................................................................................................194.3边缘检测.......................................................................................................214.4预处理...........................................................................................................234.5定位车牌........................................................................................................254.6分割车牌.......................................................................................................325设计结果及分析......................................................................................................33参考文献......................................................................................................................351相关技术介绍1.1MFC(微软基本类库)MFC是WinAPI与C++的结合,API,即微软提供的WindowsOS(操作系统)下应用程序的编程语言接口,是一种软件编程的规范,但不是一种程序开发语言本身,可以允许用户使用各种各样的第三方(如我是一方,微软是一方,Borland就是第三方)的编程语言来进行对WindowsOS下应用程序的开发,使这些被开发出来的应用程序能在WindowsOS下运行,比如VB,VC++,Java,Dehpi编程语言函数本质上全部源于API,因此用它们开发出来的应用程序都能工作在WindowsOS的消息机制和绘图里,遵守WindowsOS作为一个操作系统的内部实现。上面说