Research And Development On Software Of Automatic Fingerprint Verification System

The biometric technology is considerated as the end technolgoy of automatic identity verification technology.And automatic fingerprint identification technology is the most mature one of the biometric techonology,the uniqueness and invariableness of fingerprints is used as the main basis to identify a man and it has a great future.Automatic figerprints identification system which is a technology based on computer could be deployed to financial secruirity,data decryption,e-commerce and so on conviniently and efficiently,and it will gain more important place in our daily life.Because of noises and other influencing factors,the automatic fingerprint identification technology has many problems like low identification rate,low speed,hard to build database and so on.The author bring forward a software which has many improvations on fingerprints image preprocess,minutia extraction and database to solve the upper problems. The.main improvations on fingerprints image preprocess are to elimanate the noises to clarify the image,get back the ridge line,then thin the ridge line to one pixel width line. These next steps are image normalization,direction caculation,ridge frequency caculation,image enhancement,bianrization and postprocess.Minutiae extraction is to extract the minutiae details like position,then elimanate the fault point.This paper give a glance of algorithms already used today and tell the advantagements and disadvantagements of those algorithms, Finally this paper use matching based on minutiae to judge whether two fingerprint come from the same finger or not. This paper use xml to build the databse.and tell the strength of doing this.Finally this paper use a evaluation system which is already accepted by the world to evaluate the software,and the test results shows that this software could enhance the fingerprint efiiciently,extract the minutiae point correctly and match the minutiae point correctly.