www.gusucode.com > 车牌的定位、字符分割、并用神经网络实现了字符识别功能matlab源码程序 > code/lpr_loc.m

    function lpr_loc()
% license plate recognition - car plate location based on color model
% 2008/5/22  zickep@qq.com
I=imread('car1.jpg');
[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)<=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
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)<=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+2;

Plate=I(PY1:PY2,PX1-2:PX2,:);
t=toc % 读取计时
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
figure,imshow(I);
figure,plot(Blue_y);grid
figure,plot(Blue_x);grid
figure,imshow(IY);
figure,imshow(Plate);
%jpg=strcat(filepath,filename);
%imwrite(car,'car.jpg');