carcard.m

基于数字图像处理的MATLAB车牌定位源程序

clear;
I=imread('399.jpg');
%I=rgb2gray(I);
%I=imresize(I,[300 400 500],'bilinear');
[y,x,z]=size(I);
myI=double(I);
%%%%%%%%%%% RGB to HSI %%%%%%%%
tic % 测定算法执行的时间，开始计时

%%%%%%%%%%% 统计分析 %%%%%%%%%%%%%%%
%%%%%%%% Y 方向 %%%%%%%%%%
Blue_y=zeros(y,1);
for i=1:y
for j=1:x
%if((myI(i,j,1)<=30)&&((myI(i,j,2)<=62)&&(myI(i,j,2)>=51))&&((myI(i,j,3)<=142)&&(myI(i,j,3)>=119)))
     if((myI(i,j,1)<=121)&&myI(i,j,1)>=110&&((myI(i,j,2)<=155)&&(myI(i,j,2)>=141))&&((myI(i,j,3)<=240)&&(myI(i,j,3)>=210)))
% 蓝色RGB的灰度范围
Blue_y(i,1)= Blue_y(i,1)+1; % 蓝色象素点统计 
end 
end 
end
[temp MaxY]=max(Blue_y); % Y方向车牌区域确定
K=MaxY;
PY1=MaxY;
while ((Blue_y(PY1,1)>=5)&&(PY1>1))
PY1=PY1-1;
end 
PY2=MaxY;
while ((Blue_y(PY2,1)>=5)&&(PY2<y))
PY2=PY2+1;
end
IY=I(PY1:PY2,:,:);

%%%%%%%% X 方向 %%%%%%%%%% 
Blue_x=zeros(1,x); % 进一步确定X方向的车牌区域
for j=1:x
for i=PY1:PY2
%if((myI(i,j,1)<=30)&&((myI(i,j,2)<=62)&&(myI(i,j,2)>=51))&&((myI(i,j,3)<=142)&&(myI(i,j,3)>=119)))
     if((myI(i,j,1)<=121)&&myI(i,j,1)>=110&&((myI(i,j,2)<=155)&&(myI(i,j,2)>=141))&&((myI(i,j,3)<=240)&&(myI(i,j,3)>=210)))
Blue_x(1,j)= Blue_x(1,j)+1; 
end 
end 
end

PX1=1;
while ((Blue_x(1,PX1)<3)&&(PX1<x))
PX1=PX1+1;
end 
PX2=x;
while ((Blue_x(1,PX2)<3)&&(PX2>PX1))
PX2=PX2-1;
end
PX1=PX1-2; % 对车牌区域的修正
PX2=PX2;

Plate=I(PY1:PY2,PX1-2:PX2,:);
t=toc % 读取计时
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
I=uint8(I);
figure;
imshow(I);
figure;
plot(Blue_y);
grid
figure;
plot(Blue_x);
grid
IY=uint8(IY);
figure;
imshow(IY);
Plate=uint8(Plate);
figure;
imshow(Plate);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%文字识别子函数