| In this paper, a fingerprint identification system in TCP/IP protocol network is designed with a focus on the fingerprint matching algorithm in the network environment and the design of the fingerprint identification terminals.The fingerprint identification algorithm is a combination, which includes the algorithm of fingerprint image enhancing, image binarization, image thinning, and fingerprint characters extracting and matching. After analyzing recent matching algorithms, the research proposes a fingerprint matching theory based on descendiblity algorithm to fit the network where the fingerprint character database is usually very large. Specifically, a dynamic structure matching algorithm is firstly used to process the fingerprint characters of two images. The result is a set of the matching points. Then the descendiblity algorithm is adopted to calculate the five matching points of the set. Finally, the matching degree is ascertained by the five matching points, and compared with the reference value. If the comparison result is positive, the two fingerprints will be matching; otherwise, they are considered to be two different fingerprints.The design of the fingerprint identification terminal is the other emphasis in the research. Because the system requires the capability of network communication by TCP/IP protocol, the terminal is divided into two parts, that is, the fingerprint identification part, and the embedded platform sustaining the TCP/IP protocol. The hardware of the former part is designed with the Motorola DSP56311 digital signal processor, while that of the embedded platform is designed with the ColdFire MCF5272 that is a 32-bit processor. The embedded OS named uClinux is ported to MCF5272, and its kernel is configed to sustain the TCP/IP protocol. In addition, the JFFS file system is ported to manage the fingerprint data. The RAMDISK is designed to improve the speed of exchanging data between terminal and server. |
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