【作者】 周罡；

【导师】 郑建彬；

【作者基本信息】 武汉理工大学 ， 通信与信息系统， 2006， 硕士

【摘要】 网络信息化的发展使个人身份的信息安全成为现今社会的一个关键问题。身份识别是保护信息安全所面临的一个难题。与传统身份识别方法相比，生物特征识别因为具有防伪性好、便于携带、不易丢失和遗忘等优点而得到了越来越广泛的应用。在线签名识别是一种利用人的生物特征进行身份识别的技术。通过计算机把手写签名的图像、笔顺、速度和压力等信息与真实签名样本进行对比，以实时识别签名的真伪。 本文首先介绍了生物特征识别的现状和发展前景，对几种主要的生物特征识别方法进行了比较。随后本文提出了一种基于签名识别的在线签名数据采集系统的设计方案，其主要功能是采集笔迹信息的横、纵坐标和笔迹的压力值，并使笔迹信息能够实时显示在液晶屏上。在数据采集完成后，使用USB接口将笔迹信息传送到PC机显示和保存。最后简单介绍了签名数据出现错误的原因以及解决的预处理方法。 本文研究的重点是基于四线电阻式触摸屏的在线签名数据采集系统的软硬件设计。采集系统的硬件设计主要包含了数据采集模块、显示模块、USB通信模块和控制模块四个组成部分。其工作原理是通过四线电阻式触摸屏以200Hz的频率采集签名者的笔迹信息，并实时传给MCU，MCU将数据进行简单处理后送给显示模块进行笔迹图像的复原，供签名者参考。在这之后将数据通过USB接口传给PC机进行显示和保存。在详细介绍了整体电路设计思想的基础上，还介绍了四线电阻式触摸屏和触摸屏控制器ADS7846的控制方式、液晶控制器SED1335的工作原理以及USB总线控制芯片PDIUSBD12的工作方式。采集系统软件设计主要包含了固件程序和上位机程序两大部分，而上位机程序又涉及到动态链接库、驱动程序以及应用程序的开发。 实验结果表明，设计的在线签名数据采集系统采集精度高，稳定可靠，抗干扰能力强，能够为签名识别的后续匹配处理提供稳定可靠的数据。更多还原

【Abstract】 Nowadays the development of network information causes the information security of individual status to become a key question. Identify verification is a problem which information security faces. The biometric identification has obtained more widespread application because it has some advantages compared with traditional identify verification, such as security is good, easy to carry, not easy to get lost and forgotten and so on. On-line signature identification is the technology based on biometrics technology, through computer to compare the image, strokes, speed and pressure of handwritten signature with the true style to distinguish the signature in real-time.This paper first introduces the current situation and development prospects of biometric identification. Several of the biometric identification methods are compared. Later this paper puts forward a data acquisition system based on signature verification, its main function is to collect the x coordinate, y coordinate and pressure of handwriting information and make Handwriting information real-time display on the LCD. After completion of the data acquisition, the system uses the USB interface to transmit the handwriting information to PC .PC will save the information and make display. Finally this paper introduces some reasons for signature errors and the solutions to errors in data preprocessing .The key point of this paper is the software design and hardware design for on-line signature data acquisition system based on four-line resistance touch panel. The hardware of acquisition system mainly includes data acquisition module, show module, USB communication module and control module. The working principle is through touch panel to collect handwriting information with the frequency 200Hz, and transmit handwriting information to MCU in real-time. MCU process data simply and transmit data to the show module to make the handwriting display. The people can refer it. This will be followed by data transmission using USB interface in the PC for display and preservation. On the basis of the overall circuit introduction, this paper also introduces the four-line resistance touch panel and the control method of touch panel controller ADS7846, the working principle of LCD controller SED1335 and USB controller PDIUSBD12. The software design of acquisition system mainly includes fireware programme and PC programme. PC programme includes dll, driver programme and apply programme.The experimental results show that the system has high acquisition precision,更多还原