一種改進小波閾值函數(shù)的指紋圖像去噪方法
打開文本圖片集
關(guān)鍵詞：指紋圖像；小波閾值去噪；閾值函數(shù)；峰值信噪比；均方根誤差DOI：10.15938/j. jhust.2025.02.015中圖分類號：TN911.73 文獻標志碼：A 文章編號：1007-2683（2025）02-0140-10
Abstract：Fingerprintrecognitiontechnologyisoftendisturbedbynoise.Intheprocessofusing waveletthresholddenoising methodtoreducefingerprintimagenoise，theselectionofthethresholdfunctionisparticularlysignificant.Therefore，anewthreshold functionwithadjustableparameters，whichisbetweentraditionalsoftandhardthresholdfunctions，isconstructed.Theewthresold functionovercomesthediscontiuityofthehardthresholdfunctionatthetresholdpoint，improvestheconstantdeviationoftheoft thresholdfunctionandcanreachzerodeviationundercertainconditions.Simulationexperimentsshowthatusingthenewthreshold functiontoremovesaltand-pepperoiseandGausianoiseifingerprintimagesduringteavelet tresholddnosingprocsults inlowerrot meansquareeroranddegreeof distorioncomparedtousingtraditionalandimprovedthreshold functions，while increasingpeaksigaltonoiseatiooelationcoeffcient，ndstrucuralsilarityindexmeasure.Tisotonlyprovidesodto improve thethresholdfunction，butalsoofersaneffctive meansforimprovingthedenoisingqualityoffingerprintimages.
Keywords：fingerprintimage；waveletthresholddenoising；thresholdfunction；peak signal to noiseratio；root mean square eror
0 引言
指紋是人們的個體特征，代表著每個人獨特的身份信息。（剩余11196字）