指纹识别系统中奇异点检测及增强算法研究

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1、河北工业大学硕士学位论文指纹识别系统中奇异点检测及增强算法研究姓名：邓星亮申请学位级别：硕士专业：计算机应用技术指导教师：吴清20050101指纹识别系统中奇异点检测及增强算法研究RESEARCHoNALGoRITHMSFoRDETECTINGoFSINGULAlUTIESANDFINGERPRINTENHANCE劓唾：NTlNFINGERPRINTIDENTIFICATIoNSYSTEMAstherapiddevelopingofcomputertechnology，AutomaticFingerprintIdentificationSystemb

2、ecomesaimportantmethodbywhichcurrentsecureityproblemwhichwearefacingwithCanbesolvedwell，butbecauseofthein—timeneedinAutoFingerprintIdentificationSystem(AFIS)，currentlysomemoreadvancedalgorithmsareinfluencedgreatlyinactualapplicationwiththeircomplexity．Sowemustintroduceahigh--ef

3、ficieny,wellin--timeidentificationalgorithmtomeetthecurrentneedofapplication．Thispapar’Smajorworkishowtodetectsingularpointsaccuratelyandreliablyinfingerprintimageswithseriousnoise．Italsostudyonfingerprintenhancement．Itisveryimporttodetectsingularpoints(coreanddelta)accuratelya

4、ndreliablyforfingerprintclassificationandpoint—pattemmatchingoffingerprint．Inthispaper,ontheonehand，inordertoimprivequalityoffingerprintandreducecomputationalcomplexity,wefirstprocesssomeindispensablepreprocessingswhichincludewaveletmulti·resolutiondecomposition、imagesegmentati

5、on、iamgeenhancementbeforedetectingsingularpoints，bythesepreprocessing，wenotonlycaneliminatethenoiseduringfingerprintcollection，butalsoreducedatacapacityoffingerprintgreatly；ontheotherhand，thepaperalsobringsforwardanewalgorithmondetectingsingularities，ie，inthismethod，thecharacte

6、risticoftherelativeconcentrationofthepositionofsingularpointsdetectedthoughimageshiftandofthecorrespondingrelationshipofthesingularpointsdetectedwithmultilevelblocksizesareusedandthesingularpointsoredetectedaccuratelyandreliably．Experimentalresultsshowthatthemethodperformswella

7、nditisrobusttopoorqualityimage．Inaddition，inthispaper,afastfingerprintenchancementalgorithmbasedongray-levelimageisintroduced，thisalgorithmimprovestheclarificationofridgeandfurrowstructureoffingerprintiamgesself-adaptivelybasedonlocalridgefrequentcyanddirection．Inthisalgorithm，

8、goodband—passperformanceofGaborfilterisemployed，ridged