function lpr_loc()
% license plate recognition - car plate location based on color model
% modified by ZHAO Hui, April 30th,2005
I=imread('s.BMP');
[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(PY1Y2,:,;

%%%%%%%% 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=PY1Y2
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>X1))
PX2=PX2-1;
end
PX1=PX1-2; % 对车牌区域的修正
PX2=PX2+2;

Plate=I(PY1Y2,PX1-2X2,;
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);
这个程序总有错误！而且总说图片无法调用！这是为什么啊？？？？？