https://youtu.be/4oJ44G5C1GU

steganogrphy.m

clc;
clear all;
close all;
input = imread('cameraman.tif');
%input=rgb2gray(input); 
input=imresize(input, [512 512]); 
message='hello amir';
len = length(message) * 8;
ascii_value = uint8(message);
bin_message = transpose(dec2bin(ascii_value, 8));
bin_message = bin_message(:);
N = length(bin_message);
bin_num_message=str2num(bin_message);
output = input;
height = size(input, 1); 
width = size(input, 2);
embed_counter = 1;
for i = 1 : height 
    for j = 1 : width
        if(embed_counter <= len)
            LSB = mod(double(input(i, j)), 2);
            temp = double(xor(LSB, bin_num_message(embed_counter)));
            output(i, j) = input(i, j)+temp;
            embed_counter = embed_counter+1; 
        end
          
    end
end

sum1 = 0;
sum2 = 0;
for i =1 : 512
    for j = 1 : 512
        sum1 = sum1 + double(input(i, j));
        sum2 = sum2 + double(output(i, j));
    end
end
sum1 / (512*512)
sum2 / (512*512)

figure, imhist(input);
figure, imhist(output);

figure, imshow(input);
figure, imshow(output);