Research And Realization Of AFIS Based On Fingerprint Sweep Sensor And DSP

With the development of the information technology, more and more people come to the problem of identification. Biometric identification technology is now introduced into the identification domain; it is accurate, reliable and also secure. Because fingerprint is unique and fingerprint identification technology is feasibility and practicability, fingerprint identification has become one of the most popular and convenient identification technology. The relatively-mature Fingerprint identification system are PC-based,high cost and complex, its size is huge and can only be applicable to fixed location. In the last few years, with the development of embedded technology. Fingerprint identification technology research became hot again. Embedded processor with high ability is introduced into the AFIS, it not only reduces the price, but also improves the performance of the system.Lots of articles about the AFIS were read, key arithmetic of fingerprint image preprecess,fingerprint minutiae extraction and fingerprint minutiae matching were discussed. Practical results of arithmetic were analyzed though simulation, after that, image arithmetic was designed. LTT-SS500, a fingerprint sensor which is small, cheap and low power consumption is introduced into the fingerprint capturing system.At the same time, new arithmetic based on distant which adapt to fingerprint sweep sensor was put forward. This arithmetic can capture the displacement of the fingerprint using the information contained in the pels of the sensor, it can also resume the fingerprint image without any crossover. By using TMS320VC5509 DSP, a new fingerprint system was designed which can either be used separately or be embedded in other products. Experiment was done, the results showed that this system performed well, not only on the speed but also on the precise of identification.