Design Of High-performance Fingerprint Lock Based On DSP

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.