计算机与现代化
計算機與現代化
계산궤여현대화
COMPUTER AND MODERNIZATION
2014年
1期
81-85
,共5页
指纹识别%块梯度方差%伪特征点删除%均值滤波%二值化
指紋識彆%塊梯度方差%偽特徵點刪除%均值濾波%二值化
지문식별%괴제도방차%위특정점산제%균치려파%이치화
fingerprint identification%block gradient variance%eliminating pseudo minutiae%mean filtering%binarization
指纹图像在预处理过程中往往受多方面因素制约，有时无法满足指纹识别系统的要求。本文在传统指纹预处理算法基础上，给出一种有效的指纹预处理改进算法。首先，采用分块方差梯度分割算法分离指纹图像和背景区；再根据指纹特征，用方向图和均值滤波器进行图像增强，并用简化的Gabor滤波器，改进滤波模板滤除边缘模糊效应。二值化、细化并删除伪特征点后，提取出指纹脊线骨架并获得指纹特征点。实验表明，该预处理算法对不同质量的指纹图像均具有较好效果，算法灵活高效、易于实现、精确度高，达到了指纹识别系统的要求。
指紋圖像在預處理過程中往往受多方麵因素製約，有時無法滿足指紋識彆繫統的要求。本文在傳統指紋預處理算法基礎上，給齣一種有效的指紋預處理改進算法。首先，採用分塊方差梯度分割算法分離指紋圖像和揹景區；再根據指紋特徵，用方嚮圖和均值濾波器進行圖像增彊，併用簡化的Gabor濾波器，改進濾波模闆濾除邊緣模糊效應。二值化、細化併刪除偽特徵點後，提取齣指紋脊線骨架併穫得指紋特徵點。實驗錶明，該預處理算法對不同質量的指紋圖像均具有較好效果，算法靈活高效、易于實現、精確度高，達到瞭指紋識彆繫統的要求。
지문도상재예처리과정중왕왕수다방면인소제약，유시무법만족지문식별계통적요구。본문재전통지문예처리산법기출상，급출일충유효적지문예처리개진산법。수선，채용분괴방차제도분할산법분리지문도상화배경구；재근거지문특정，용방향도화균치려파기진행도상증강，병용간화적Gabor려파기，개진려파모판려제변연모호효응。이치화、세화병산제위특정점후，제취출지문척선골가병획득지문특정점。실험표명，해예처리산법대불동질량적지문도상균구유교호효과，산법령활고효、역우실현、정학도고，체도료지문식별계통적요구。
The fingerprint image in preprocessing is often affected by many factors , but sometimes can not meet the requirements of fingerprint identification system .In this article , an effective fingerprint preprocessing algorithm is presented based on the tradi-tional methods for preprocessing .Firstly, a method based on block gradient variance is implemented to achieve the separation of the fingerprint image and the background area .Secondly , according to the fingerprint feature , we use orientation map and mean filter to enhance the image .And using simplified Gabor filter improves the filtering template to filter edge blur effect .After binari-zation, thinning and eliminating pseudo minutiae , we get the fingerprint image skeletonization and extract the fingerprint feature points.Experiments show that the preprocessing algorithm is applicable to images of different qualities and levels .It is flexible, efficient, easy, and accurate, meets the requirement of fingerprint identification system .
