生物特征识别技术因其在身份识别时的准确

大庆石油学院应用技术学院毕业论文I摘要生物特征识别技术因其在身份识别时的准确、方便、不易仿造等特点，正在被越来越多的学者和研究机构所重视。所谓生物特征识别技术是指通过计算机利用人体所固有的生理特征或行为特征来进行个人的身份识别。目前，已有很多生物个体特征识别技术被研究和使用，但在系统的准确性、方便性和实用性等方面，它们尚不能满足人们的要求。（上段以引言的方式简要说明论文立题的背景、意义和进行这方面研究的必要性。）本文首先分析比较了各种生物特征在身份识别的不同指标下所表现的能力，从方便性、准确性和实用性的角度出发，提出了采用人脸特征和语音信息相结合的组合特征方法,并通过对动态和静态两种特征的研究，完成它们的特征提取和有效的数据融合，更为全面的将人的个体特征信息提供给识别系统。同时本文针对生物特征识别技术中存在的问题，对神经网络技术及其在模式识别系统中的应用进行了深入的研究。首先，针对特征数据量大、各种数据对特征的表征能力不同的问题，提出采用APEX网络实现特征优化；其次，针对神经网络构建时，因网络结构和参数初始化无通用方法可寻而采用随机赋值造成网络收敛缓慢的问题，提出了一种新的通用的神经网络构建方法WKBNN；最后，针对开机身份识别的特点，以及神经网络对在完成多类别分类情况下的训练和识别时网络收敛缓慢的问题，提出了采用子网组合方式来设计识别器。作为这些研究成果的应用，本文在最后用Matlab程序实现了一个基于神经网络的生物特征身份识别系统试验平台。并根据对参试者进行的大量身份测试试验，总结系统的各方面能力和分析存在的问题，为进一步的研究提供了方向和宝贵的经验。（上面这部分扼要介绍作者在论文中陈述的主要内容）关键词神经网络；模式识别；数据融合；生物特征；人脸识别大庆石油学院应用技术学院毕业论文II目录摘要·······································································································I第1章章标题······················································································11.1节标题··························································································11.1.1小标题·····················································································11.1.2小标题·····················································································11.2节标题··························································································11.2.1小标题·····················································································11.2.2小标题·····················································································11.2.3小标题·····················································································11.2.4小标题·····················································································2第2章章标题······························································错误!未定义书签。2.1节标题···································································错误!未定义书签。2.2节标题···································································错误!未定义书签。2.3节标题···································································错误!未定义书签。第3章章标题······························································错误!未定义书签。3.1节标题···································································错误!未定义书签。3.2节标题···································································错误!未定义书签。3.2.1小标题·····························································错误!未定义书签。3.2.2小标题·····························································错误!未定义书签。3.2.3小标题·····························································错误!未定义书签。3.3节标题···································································错误!未定义书签。3.3.1小标题·····························································错误!未定义书签。3.3.2小标题·····························································错误!未定义书签。3.4节标题···································································错误!未定义书签。3.4.1小标题·····························································错误!未定义书签。3.4.2小标题·····························································错误!未定义书签。3.4.3小标题·····························································错误!未定义书签。3.5节标题···································································错误!未定义书签。3.5.1小标题·····························································错误!未定义书签。3.5.2小标题·····························································错误!未定义书签。3.5.3小标题·····························································错误!未定义书签。第4章章标题······························································错误!未定义书签。4.1节标题··································································错误!未定义书签。4.2节标题··································································错误!未定义书签。目录III4.3节标题··································································错误!未定义书签。4.4节标题··································································错误!未定义书签。参考文献···················································································6致谢·························································································7大庆石油学院应用技术学院毕业论文1第1章章标题1.1节标题1.1.1小标题CPLD和FPGA在工业界已被广泛的应用，这种成功主要是以牺牲门阵列、及标准单元电路ASIC为代价的。为了使触发器触发速率和快速路由的延迟得到近似于真实设计的结果，可编程逻辑的速度也得加快。尤其是，如果你可能会使用到可编程逻辑器件所提供的嵌入式存储器的时候，因为它的容量增多，因此，相应地按每门计算的成本也更加便宜。1.1.2小标题在工业生产现场，有时环境比较恶劣，对现场数据采集的工作多数采用单片机完成。利用单片机串口通信功能发送数据到检测中心。随着数字技术的发展和计算机日益广泛的应用，现在一个系统往往由多台计算机组成，需要解决多站、远距离通信的问题。在要求通信距离为几十米到上千米时，广泛采用RS-485收发器。RS-485收发器采用平衡发送和差分接收，因此具有抑制共模干扰的能力，加上接收器具有高的灵敏度，能检测低达200mV的电压，故传输信号能在千米以外得到恢复。使用RS-485总线，一对双绞线就能实现多站联网，构成分布式系统，设备简单、价格低廉、能进行长距离通信的优点使其得到了广泛的应用。1.2节标题1.2.1小标题微控制器是将微型计算机的主要部分集成在一个芯片上的单芯片微型计算机。微控制器诞生于20世纪70年代中期，经过20多年的发展，其成本越来越低，而性能越来越强大，这使其应用已经无处不在，遍及各个领域。例如电机控制、条码阅读器、消费类电子、游戏设备、电话、HVAC、楼宇安全与门禁控制、工业控制与自动化和白色家电(洗衣机、微波炉)等。1.2.2小标题美国国家仪器(NI)公司首先提出了虚拟仪器的概念，虚拟仪器的英文即VirtualInstrument，故也简称VI。它是用户根据自己的需求在通用计算机平台上来定义和设计测试功能的仪器系统。也就是说虚拟仪器是由用户利用相关硬件及软件编程技术组成的各种各样的仪器系统。1.2.3小标题从构成要素讲，虚拟仪器系统是由计算机、应用软件和一定的仪器硬件三部分组成的；从构成方式讲，虚拟仪器的系统组成可由图1-1表示。大庆石油学院应用技术学院毕业论文21.2.4小标题网聚合物光纤正以其独特的优势在数据传输、广场照明、工业控制、消费电子、军事通信、汽车工业、医疗系统等各个方面得到广泛应用，并已经表现出了巨大的发展潜力，现在国内外正投入大量的精力开展关于聚合物光纤相关问题的进一步研究。1.3节标题ARM公司是专门从事