单芯片微小型指纹识别系统设计与实现

Design and implementation of single-chip small size fingerprint identification system

嵌入式指纹识别产品的推广应用一直受到成本和体积因素的制约。提出一种基于ARM7处理器芯片LPC2106为核心的单芯片嵌入式自动指纹识别系统设计方案,给出了系统组成的电路结构,运用了一种高效率的嵌入式指纹图像拼接及识别算法软件,并设计出用于改善指纹识别性能的指纹引导槽方案。结果表明,2秒内能完成20个指纹用户的识别,在认假率为十万分之一时,拒真率不超过百分之三,达到国家有关标准的要求。该产品体积小,价格只有同类产品的约三分之一,可应用于指纹门锁、指纹保险箱、指纹遥控器等领域。

The popularization and application of the embedded fingerprint identification products have been constrained by cost and size all the time.The idea of designing a fingerprint identification system based on the System On Chip（SOC） ARM7 LPC2106 is presented.The composition of the system structure,highly efficient embedded fingerprint recognition algorithm for image stitching technology, and the mechanical design to improve the performance of the new fingerprint identification guide groove are given.The results show that the system can complete fingerprint identification for 20 different users within two seconds.When the False Accept Rate（FAR） is one hundred thousandths,the False Rejection Rate（FRR） will be no more than 3 percent.It＇s in line with national standards.In addition, this system also has a small size.The price is only about one third of similar products in market.It can be widely used in fingerprint lock, fingerprint safe, fingerprint remote control and other fields in the future.