导　　师： 戴青云

学科专业： H1002

授予学位： 硕士

作　　者： ;

机构地区： 广东工业大学

摘　　要： 当今社会，某高档住宅因为门禁系统失控，致使财物人身损失的情况经常发生，机械门锁、密码门锁、ic卡门锁等传统门锁的安全性受到了空前挑战，因此，人们把目光和希望更多的投向了生物识别技术。指纹识别技术是一种重要的生物身份识别技术，也是目前生物识别技术发展的最为成熟的一个分支。作为一种飞速发展的技术，指纹识别己经在刑侦领域大显身手，在身份认证等民用领域，这项技术也具有广阔的应用空间。恰当地把指纹识别系统应用到门禁锁上去，能更有效地实现门锁产品智能化和防盗的目标。 本论文结合指纹识别的应用情况，以指纹算法在门禁锁上实现的思想为指导，运用成熟的指纹算法和嵌入式系统的技术，设计和实现了一个高性能、低成本、低功耗、识别速度快的指纹锁系统。本文主要从以下几个方面进行了研究工作： 1、针对生物识别技术进行分析，展望国内外指纹识别系统的发展状况和市场需求，应用指纹识别算法和现有的软硬件条件，系统设计了一个嵌入式指纹锁的方案，其中包括硬件平台的搭建和软件的设计实现。 2、对现有的图像采集传感器进行比较选择，针对本课题中图像采集的需求，选用cmos光学传感器作为采集头，并采用一种高速图像采集方式；针对指纹锁的特点，在硬件设计方面，选择性价比高、功耗低的元器件，并在软件设计上作了相应处理，降低了系统硬件成本和整体功耗。 3、为了防止数据通信出错，系统设计了一个指纹识别模块和控制模块的数据通信协议，该协议中包含物理层通信协议和数据链路层crc校验，用以保证通信的正确、稳定性。 4、针对指纹算法的特殊性，在电脑端对指纹识别算法进行验证，结合本系统设计的嵌入式系统平台，利用一定的开发编译环境，进行算法移植和优化。 5、采用存储器扩展技术，对本系统设计所需要的资源，扩展了外部sdram和data flash，用于保存不同的数据。 最后对整个系统进行概括性总结，指出在开发调试阶段所遇到的问题，以及采用的解决方法，并展示了本系统的调试结果和实际性能参数，指出其中仍可以改进的地方，并提出若干的改进方向。 Currently, even in some exclusive residence, the disfunctional entrance guard systems always cause the property loss and personal danger. The security of traditional locks, such as mechanism lock, password lock and IC card lock, are highly challenged. Therefore, the biology recognition technology gets more and more expectation. Fingerprint recognition technology is not only one of the most important biology recognition technologies, it is also the most mature one. As a fast developing technology, the fingerprint recognition is playing an important role in the area of penal detective. In civil field such as bank identity recognition, it also has high application potential. How to apply fingerprint recognition system to the entrance guard lock can help to intelligentize the locks and prevent stealing. Based on the application of fingerprint recognition, directed by the idea of fingerprint algorithm applied in entrance guard lock based on the mature fingerprint algorithm and embedded system technology, this thesis presents the design and implementation of fingerprint locks system with high performance, low cost, low power waste and fast recognition. The main points of this thesis are presented as below: 1. Based on the analysis of biology recognition technology, the development and market demand of domestic and overseas fingerprint recognition system, the application of fingerprint algorithm, the existing software and hardware, we designed an embedded fingerprint lock, which includes the design of hardware and the implementation of software. 2. According to the demand of image acquisition, we chose image sensor from the existing sensors. This thesis selected a CMOS optics image sensor for the image acquisition, applied the fast way of image acquisition, selected low power waste components for the hardware design, and special methods for the software implementation. In the end, we reduced the cost and power waste of the hardware system farthest. 3. To ensure the accuracy of data transmission, a practical communication protocol, which connects the module of fingerprint recognition to the module of the control system, is introduced to the system. It includes the physics layer I2C protocol and the data-link layer CRC protocol. 4. According to the particularity of the system, we first validated the fingerprint algorithm in PC, then we transplanted and optimized the algorithm to the system, based on the embedded system hardware and the software development environment. 5. Applying the extended memory technology, we designed the extended memory SDRAM and DATA FLASH to save different kinds of data for the resource the system needed, Finally, the thesis summarizes the whole system, points out the problems during the development and the way to resolve. At the end, we present the result of the system application and some performance, make some suggestions for further research.

关 键 词： 指纹识别 指纹算法 嵌入式系统 存储器扩展

分 类 号： [TP391.41]

领　　域： [自动化与计算机技术] [自动化与计算机技术]