无线指纹识别技术在考试系统的应用研究

研究无线指纹识别问题,保证实时可靠,实现一个用于进行考试身份验证无线的指纹识别系统。利用嵌入式指纹终端采集考生的指纹,进行分割、增强、二值化等预处理后,通过CDMA无线网络将指纹特征发送给服务器进行匹配,指纹识别终端采用ARM9微处理器,MG815＋CMDA通信模块,μC/OS-II实时操作系统。对指纹识别中常用的二值化、细化、特征提取和特征匹配等关键算法进行了改进,对采用多级分割的分割算法、改进的Otsu的二值化算法、基于三角形全等的指纹特匹配算法。实验结果表明,系统平均耗费时间4.2s,平均匹配度为85.6%,系统响应时间和准确度基本能满足实际的要求。

Application of Embedded Wireless Fingerprint Verification Technology in Exam Management System

An embedded wireless fingerprint verification technolngy applied to exam management system based on CDMA 2000 wireless network is proposed and realized. Fingerprint captured by embedded terminal with pretreatment is sent to a long-distance server system for identification through CDMA wireless network, embedded terminal is de-signed with ARM9 micro-controller, MG815 CMDA communication module and μC/OS-Ⅱ real-time operating system. Some relevant algorithms applicable to embedded system for fingerprint segmentation, enhancement and bina-ryzntion are described,such as multilevel fingerprint segment algorithm, improved Otsu binaryzation algorithm, con-gruent triangle fingerprint matching algorithm. Test results show that the average-used time of the system is 2.4s and average-match rate is 85.6% ,can meet the practical requirements.