<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/1999/REC-html401-19991224/strict.dtd">
clc;
close all;
clear all;
im=imread('cameraman.tif');
figure,imshow(im);
impixelinfo;
r=[53 55 101 99];
c=[125 170 172 117];
bw=roipoly(im,c,r);
figure,imshow(bw);
im2=im.*uint8(bw);
figure,imshow(im2);
im3=im-im2;
figure,imshow(im3);
im4=im3+im2;
figure,imshow(im4);
imhist(im);
histeq(im);