MATLAB代码实现夜间车牌识别程序.rar

clear all clc PS=imread('1.jpg'); subplot(1,2,1); imshow(PS) title('原图') p=rgb2gray(PS); subplot(1,2,2) imshow(p) title('原灰度图') [m,n]=size(p); GP=zeros(1,256); for k=0:255 GP(k+1)=length(find(p==k))/(m*n); end figure subplot(1,2,1); bar(0:255,GP,'g') title('原灰度直方图') max_index=[]; for i=3:length(GP)-2 if((GP(i)>=GP(i+1))&(GP(i)>=GP(i-1)))&((GP(i+1)>=GP(i+2))&(GP(i-1)>=GP(i-2))) max_index(end+1)=i-1; end end possible=GP(max_index); [max_value,index]=max(possible); TT=max_index(index)-2; [m,n]=size(p); R=zeros(m,n); for i=1:m for j=1:n if p(i,j)<TT R(i,j)=0; else R(i,j)=256; end end end subplot(1,2,2); imshow(R); title('二值图');