img=imread('C:\Users\home\Desktop\st.jpg');
grayimg=rgb2gray(img);
histequalimg=imhistequal(grayimg);
imshow(img);title("original img");
figure;imshow(grayimg);title("gray img");
figure;imshow(histequalimg);title("histogram image");
show_window(5);
subplot(221);
imshow(img);
title("original image");
subplot(222);
imshow(grayimg);
title("gray img");
subplot(223);
imshow(histequalimg);
title("historgam image");