clear all,close all,clc % 清理工作空间,关闭运行窗口,清理命令窗口
I=imread('Empreinte.bmp'); % 读入图像
imshow(I) % 显示图像
set(gcf,'position',[1 1 600 600]); % 得到图形窗口句柄,设置图形窗口位置
J=I(:,:,1)>160; % 设定阈值为160,进行黑白化处理
imshow(J) % 显示处理后的图像
set(gcf,'position',[1 1 600 600]); % 得到图形窗口句柄,设置图形窗口位置
K=bwmorph(~J,'thin','inf'); % 数学形态学运算,图像细化,~符号代表黑白反色
imshow(~K) % 显示处理后的图像,~符号代表黑白反色
set(gcf,'position',[1 1 600 600]); % 得到图形窗口句柄,设置图形窗口位置
function y=minutie(x)
i=ceil(size(x)/2);
if x(i,i)==0;
y=0;
else
y=sum(x(:)) - 1;
end
fun=@minutie; % 得到函数句柄
L = nlfilter(K,[3 3],fun); % 滤波处理
LTerm=(L==1); % 选择端点
imshow(LTerm) % 显示白色点
LTermLab=bwlabel(LTerm); % 端点标识
propTerm=regionprops(LTermLab,'Centroid'); % 端点区域分析,寻找端点区域中心
CentroidTerm=round(cat(1,propTerm(:).Centroid)); % 端点圆整为整数
imshow(~K) % 显示隆线细化图像
set(gcf,'position',[1 1 600 600]); % 得到当前图形窗口句柄,设置位置
hold on % 在前面的图形窗口继续绘制图像
plot(CentroidTerm(:,1),CentroidTerm(:,2),'ro') % 绘制隆线端点标识,红色圆圈
LBif=(L==3); % 选择分叉点
LBifLab=bwlabel(LBif); % 分叉点标识
propBif=regionprops(LBifLab,'Centroid','Image'); % 区域分析,寻找区域中心
CentroidBif=round(cat(1,propBif(:).Centroid)); % 分叉点圆整为整数
plot(CentroidBif(:,1),CentroidBif(:,2),'go') % 绘制隆线分叉点标识,绿色圆圈
D=6;
Distance=DistEuclidian(CentroidBif,CentroidTerm); % 求端点和分叉点的距离
SpuriousMinutae=Distance<D; % 满足距离小于D的点
[i,j]=find(SpuriousMinutae); % 查找对应像素点
CentroidBif(i,:)=[]; % 去除该分叉点
CentroidTerm(j,:)=[]; % 去除该端点
Distance=DistEuclidian(CentroidBif); % 求两个分叉点的距离
SpuriousMinutae=Distance<D; % 满足距离小于D的点
[i,j]=find(SpuriousMinutae); % 查找对应像素点
CentroidBif(i,:)=[]; % 去除该分叉点
Distance=DistEuclidian(CentroidTerm); % 求两个端点的距离
SpuriousMinutae=Distance<D; % 满足距离小于D的点
[i,j]=find(SpuriousMinutae); % 查找对应像素点
CentroidTerm(i,:)=[]; % 去除该端点
hold off % 结束在前面的图形窗口绘图
imshow(~K) % 显示细化图
hold on % 继续在前面的图形窗口绘图
plot(CentroidTerm(:,1),CentroidTerm(:,2),'ro') % 绘制隆线端点标识,红色圆圈
plot(CentroidBif(:,1),CentroidBif(:,2),'go') % 绘制隆线分叉点标识,绿色圆圈
hold off % 结束在前面的图形窗口绘图
Kopen=imclose(K,strel('square',7)); % 闭合运算
KopenClean= imfill(Kopen,'holes'); % 填充图像中的孔洞
KopenClean=bwareaopen(KopenClean,5); % 开运算
imshow(KopenClean) % 显示处理结果
KopenClean([1 end],:)=0; % 赋值语句
KopenClean(:,[1 end])=0; % 赋值语句
ROI=imerode(KopenClean,strel('disk',10)); % 腐蚀运算
imshow(ROI) % 显示处理结果
imshow(I) % 显示原始图像
hold on % 继续在前面的图形窗口绘图
imshow(ROI) % 显示感兴趣区域
alpha(0.5) % 设置透明度
hold on % 继续在前面的图形窗口绘图
plot(CentroidTerm(:,1),CentroidTerm(:,2),'ro') % 绘制端点标识,红色圆圈
plot(CentroidBif(:,1),CentroidBif(:,2),'go') % 绘制分叉点标识,绿色圆圈
hold off % 结束在前面的图形窗口绘图
[m,n]=size(I(:,:,1)); % 求图像尺寸
indTerm=sub2ind([m,n]; % 从下标得到单精度索引
CentroidTerm(:,1),CentroidTerm(:,2)); % 端点
Z=zeros(m,n); % 全零矩阵
Z(indTerm)=1;
ZTerm=Z.*ROI';
[CentroidTermX,CentroidTermY]=find(ZTerm);
indBif=sub2ind([m,n],CentroidBif(:,1),CentroidBif(:,2)); % 从下标得到单精度索引
Z=zeros(m,n);
Z(indBif)=1;
ZBif=Z.*ROI';
[CentroidBifX,CentroidBifY]=find(ZBif);
imshow(I) % 显示原始图像
hold on % 继续绘图
plot(CentroidTermX,CentroidTermY,'ro','linewidth',2) % 红色圆圈
plot(CentroidBifX,CentroidBifY,'go','linewidth',2) % 绿色圆圈
Table=[3*pi/4 2*pi/3 pi/2 pi/3 pi/4 % 角度查找表
5*pi/6 0 0 0 pi/6
pi 0 0 0 0
-5*pi/6 0 0 0 -pi/6
-3*pi/4 -2*pi/3 -pi/2 -pi/3 -pi/4];
for ind=1:length(CentroidTermX)
Klocal=K(CentroidTermY(ind)-2:CentroidTermY(ind)+2, ...
CentroidTermX(ind)-2:CentroidTermX(ind)+2);
Klocal(2:end-1,2:end-1)=0;
[i,j]=find(Klocal);
OrientationTerm(ind,1)=Table(i,j);
end
dxTerm=sin(OrientationTerm)*5;
dyTerm=cos(OrientationTerm)*5;
figure % 新建窗口
imshow(K) % 显示黑白图
set(gcf,'position',[1 1 600 600]); % 设置图像窗口属性
hold on % 继续绘图
plot(CentroidTermX,CentroidTermY,'ro','linewidth',2) % 红色圆圈
plot([CentroidTermX CentroidTermX+dyTerm]',... % 红色短线
[CentroidTermY CentroidTermY-dxTerm]','r','linewidth',2)
for ind=1:length(CentroidBifX)
Klocal=K(CentroidBifY(ind)-2:CentroidBifY(ind)+2, ...
CentroidBifX(ind)-2:CentroidBifX(ind)+2);
Klocal(2:end-1,2:end-1)=0;
[i,j]=find(Klocal);
if length(i)~=3
CentroidBifY(ind)=NaN;
CentroidBifX(ind)=NaN;
OrientationBif(ind)=NaN;
else
for k=1:3
OrientationBif(ind,k)=Table(i(k),j(k));
dxBif(ind,k)=sin(OrientationBif(ind,k))*5;
dyBif(ind,k)=cos(OrientationBif(ind,k))*5;
end
end
end
plot(CentroidBifX,CentroidBifY,'go','linewidth',2) % 绿色圆圈
OrientationLinesX=[CentroidBifX ...
CentroidBifX+dyBif(:,1);CentroidBifX ...
CentroidBifX+dyBif(:,2);CentroidBifX CentroidBifX+dyBif(:,3)]';
OrientationLinesY=[CentroidBifY
CentroidBifY-dxBif(:,1);CentroidBifY ...
CentroidBifY-dxBif(:,2);CentroidBifY CentroidBifY-dxBif(:,3)]';
plot(OrientationLinesX,OrientationLinesY,'g','linewidth',2) % 绿色短线
MinutiaTerm=[CentroidTermX,CentroidTermY,OrientationTerm];
MinutiaBif=[CentroidBifX,CentroidBifY,OrientationBif];
saveMinutia('John Doe',MinutiaTerm,MinutiaBif); % saveMinutia函数见附件程序
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MATLAB图像处理宝典
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