自动指纹识别系统中若干关键算法的分析

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1、ABSTRACTTheresearchofAutomaticFingerprintIdentificationSystem(AFIS)istheresearchpoppointinthefieldofstatusidentificationnowadays．AlthoughtheoreticalresearchandapplicationdevelopmentofAFIShavegotasignificantprogress，accuracy．ofthealgorithmandprocessingspee

2、dstillneedtobeimproved．Inthispaper,thestructureandworkingprincipleofAFISisfirstlydescribed，thenbyusingtheknowledgeofDigitalImageProcessingandPatternRecognition，theproblemsoffingerprintimageenhancement，featureextraction，fingerprintclassificationandmatching

3、areanalyzedanddiscussedindetail．Contributionsarelistedasfollows：1．Intheaspectoffingerprintimageenhancementalgorithm，animprovedGabor-basedfingerprintimageenhancementmethodisproposed，whichfirstlyrealizesfingerprintimagesegmentationbylinearsupportvectormachi

4、neandextractsfingerprintorientationfieldandridgefrequency,thenimprovedGaborfilterisusedtoaccomplishfingerprintimageenhancement．i2．Intheaspectoffingerprintfeatureextractionalgorithm，animprovedminutiaeextractionalgorithmbasedonfingerprintgray—scaleimageispr

5、esented．Basedoninformationfusion，itcombinestheextractionresultsoffingerprintthinnedimagetocoarselyeliminatethefalse，thenfalseminutiaeintheforegroundedgeareremovedaccordingtosegmentationmask，finallyseveralkindsofpost—processingrulesareintegratedtodeletedif

6、ferenttypesoffalseminutiaeinfingerprintgray—scaleimage．3．Intheaspectoffingerprintclassificationalgorithm，firstly,combiningfingerprintsingularpointinformationandcentralridgeorientation，afingerprintclassificationalgorithmbasedonstructureandregulationispropo

7、sed，whichimportsmodel-basedfeedbackmechanismtoimproveclassificationaccuracyrate．Secondly,afingerprintindexingalgorithmbasedonaverageridgedistanceispresented，whichperformscontinuoussearchinthetemplatedatabaseusingaverageridgedistance，meanwhilearbitraryclas

8、sificationprecisionCanberealizedbyadjustingJlsearchradius．4．Intheaspectoffingerprintmatchingalgorithm，atwo—stepfingerprintmatchingalgorithm，whichcombineslocalmatchingandglobalmatching，isadopted．Akindofminutiaelocals