[filename,filepath]=uigetfile('.jpg','输入车牌图像');% 直接自动读入%
file=strcat(filepath,filename); %strcat函数：连接字符串；把filepath的字符串与filename的连接，即路径/文件名
I=imread(file);
axes(handles.axes1)%让车牌显示在axes1控件中
imshow(I)%显示
title(‘车牌’)

I1=rgb2gray(I);  %灰度处理
I2=edge(I1,'roberts',0.15,'both');  %边缘检测
se=[1;1;1];
I3=imerode(I2,se);
se=strel('rectangle',[25,25]);
I4=imclose(I3,se);  %闭运算，去除杂质影响
I5=bwareaopen(I4,2000);  %膨胀操作

[y,x,z]=size(I5);
myI=double(I5);
ticwhite_y=zeros(y,1);  for i=1:y  for j=1:x  if(myI(i,j,1)==1)   white_y(i,1)= white_y(i,1)+1;   end end end [temp MaxY]=max(white_y);  PY1=MaxY;  while ((white_y(PY1,1)>=5)&&(PY1>1))  PY1=PY1-1;  end PY2=MaxY;  while ((white_y(PY2,1)>=5)&&(PY2<y))  PY2=PY2+1;  end IY=I(PY1:PY2,:,:);  white_x=zeros(1,x);  for j=1:x  for i=PY1:PY2  if(myI(i,j,1)==1)  white_x(1,j)= white_x(1,j)+1;                 end end end PX1=1;  while ((white_x(1,PX1)<3)&&(PX1<x))  PX1=PX1+1;  end PX2=x;  while ((white_x(1,PX2)<3)&&(PX2>PX1))  PX2=PX2-1;  end PX1=PX1-2;  PX2=PX2+3;  dw=I(PY1:PY2-8,PX1:PX2,:);  axes(handles.axes2)imshow(dw)title('定位的车牌')

4、字符分割
% 切割出 7 个字符
y1=10;y2=0.25;flag=0;word1=[];
while flag==0  [m,n]=size(d);  left=1;wide=0;  while sum(d(:,wide+1))~=0  wide=wide+1;  end if wide<y1   % 认为是左侧干扰  d(:,[1:wide])=0;  d=qiege(d);  else temp=qiege(imcrop(d,[1 1 wide m]));  [m,n]=size(temp);  all=sum(sum(temp));  two_thirds=sum(sum(temp([round(m/3):2*round(m/3)],:)));
end
% 分割出第二个字符
[word2,d]=getword(d);
% 分割出第三个字符
[word3,d]=getword(d);
% 分割出第四个字符
[word4,d]=getword(d);
% 分割出第五个字符
[word5,d]=getword(d);
% 分割出第六个字符
[word6,d]=getword(d);
% 分割出第七个字符
[word7,d]=getword(d);  

 liccode=char(['0':'9' 'A':'Z' '京津沪渝冀豫云辽黑湘皖鲁新苏浙赣鄂桂甘晋蒙陕吉闽贵粤青藏川宁琼']);%SubBw2=zeros(40,20);
l=1;
for I=1:7;ii=int2str(I);t=imread([ii,'.jpg']);SegBw2=imresize(t,[40 20],'nearest');SegBw2=double(SegBw2)>20;if l==1 %第一位汉字识别kmin=37;kmax=43;elseif l==2 %第二位字母识别kmin=11;kmax=36;else l>=3   %第三位后字母或数字识别kmin=1;kmax=36;endfor k2=kmin:kmaxfname=strcat('字符模板\',liccode(k2),'.jpg');SamBw2=imread(fname);SamBw2=double(SamBw2)>1;for i=1:40for j=1:20SubBw2(i,j)=SegBw2(i,j)-SamBw2(i,j);endend%相当于两幅图相减得第三幅图Dmax=0;for k1=1:40;for l1=1:20if(SubBw2(k1,l1)>0 || SubBw2(k1,l1)<0)Dmax=Dmax+1;endendendError(k2)=Dmax;endError1=Error(kmin:kmax);MinError=min(Error1);findc=find(Error1==MinError);Code(l*2-1)=liccode(findc+kmin-1);Code(l*2)=' ';l=l+1;
end
t=toc;
set(handles.text4,'string',Code)