f=imread('C:\Documents and Settings\lishurui\桌面\lena.bmp');
j=histeq(f);
subplot(2,2,1);
imshow(f);
title('原始圖像');
subplot(2,2,2);
imshow(j);
title('直方圖均衡圖像');
subplot(2,2,3);
imhist(f);
title('原始圖像直方圖');
subplot(2,2,4);
imhist(j);
title('均衡化圖像直方圖');
f=imread('C:\Documents and Settings\lishurui\桌面\lena.bmp');
[j,T]=histeq(f);
figure,plot((0:255/255),T);