车牌定位MATLAB代码

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