指紋圖像壓縮系統(tǒng)研究.pdf

1、北京交通大學碩士學位論文指紋圖像壓縮系統(tǒng)研究姓名：付文強申請學位級別：碩士專業(yè)：通信與信息系統(tǒng)指導教師：張立軍鄭利龍20090601ABSTRACTABSTRACT：AsoneofthemostcommonlyusedbiometricstechnologyfingerprintrecognitionhasbeenwidelyadaptedinidentificationandverificationofapersonAsthenumb

2、erofthefingerprinttemplateshasbeenincreased，itwilldegradetheperformanceofthefingerprintverificationsystemOnewaytoimprovetheefficiencyofthesystemiStoreducethetemplatesizebyimagecompressionontheconditionthatthecompressiont

3、imeissufficientlysmallForcompressionalgorithms，thehighel“compressionratioandfidelityofthesealgorithmswillincurthecomplexityofcomputationFirstlyacompressionmethodologybasedonWaveletScalarQuantization(WSQ)algorithmforfinge

4、rprintcompressionalgorithmhasproposedwhichisusing5／3LiftingSchemeDiscreteWaveletTransform(LSDWT)inthiscaseThisisactuallyakindofimagecompressionalgorithm，including3level5／3LS—DWTquantization，Huffmancodingandnln—lengthcodi

5、ngThesimulationresultsshowedthat：theproposedalgorithmisbetterthanthetraditionalWSQwithrespecttocompressionratioandimagequalityeg，whencompressionratiois16(05bpp)，theproposedalgorithmcanreachaPeakSignaltoNoiseRatio(PSNR)of

6、5734dBandhasalowercomputationalcomplexitythusmakingitmucheasiertoinhardwareimplementationSecondlycomparedwiththoseimagecompressionmethods，theminutiaeextractioninfingerprintimagescanobtainahighel“compressionratiobecauseit

7、justkeepsthecharacteristicinformationinsteadofstoringthewholeoriginalfingerprintimageHowevercomputationalcomplexityishigherandtheprocessistediousThealgorithmissuccessfullytransplantedtoClanguage，whichallowsofthealgorithm

8、tobeimplementedonNiosIIsoft—coreprocessorplatformFinallywehavebuiltpartlythefingerprintscallandstorageforthewholefingerprintimagecompressionsystemonanEP2S60FPGA(fieldprogrammablegatearray)developmentboardwiththeQuartusII

9、60integrateddevelopmentplatformThetwosubsystemsarenecessitiesfortllefurthercompressionofthefingerprintimages，whichincludetheHV7131fingerprintsensorItisupto1361ALUTs，1057registersand2PLLsbeingusedinthedesignInaddition，the