matlab图像处理：低照度图像增强

对于整体亮度较弱的图像，我们常常需要进行增强，以下是采用自适应方式进行图像处理。

close all;
clear all;
warning off all;

I = imread('rice.png');
figure;
imshow(I);
title('原始图像');

[m,n,d] = size(I);  
if d == 1  
    J = I;  
else  
    J = rgb2gray(I);  
end  
  
%1.图像边界扩展  
w = 257;
k = 0.8;
w = k*min(m, n);
padsize = [w/2, w/2];  
padsize = ceil(padsize);
padSrc = padarray(J,padsize,'symmetric','both');  

%2.循环求解每个区域对应的值  
R = zeros(m,n);  
iter = 0;  
w2 = w;
w3 = ceil(w/2);

for i=1:m  
    for j=1:n  
        slideWindow = padSrc(i:i+w2-1,j:j+w2-1);  
        AHE_piexl = AHE(slideWindow,J(i,j));  
        R(i,j) = AHE_piexl;  
    end  

end  
  
R = uint8(R);  <