Image hiding inside an image

Question

lilly lord 2022-7-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1763120-image-hiding-inside-an-image

编辑： lilly lord 2022-7-21

Hello, I am trying to hide an image inside an image taking one row of the secret image at a time.

input = imread('peppers.png');% cover image
 I1=imread('message1.png');%%% secret image grayscale 64*64 
% Convert image to grayscale
input=rgb2gray(input);
 % Resize the image to required size
input=imresize(input, [512 512]);
 message=I1(1,:);
len = length(message) * 8;
 bin_message1=de2bi(message,'left-msb',8);
% Get all the binary digits in separate row
bin_message = bin_message1(:);
 
% Length of the binary message
N = length(bin_message);
  
% Initialize output as input
output1 = 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_message(embed_counter)));
                
            output1(i, j) = input(i, j)+temp;
                       
            embed_counter = embed_counter+1;
        end
         
    end
end
%%%%%%%%%%%% 2nd row of I1 to hide
 message2=I1(2,:);
 len = length(message2) * 8;
 bin_message2=de2bi(message2,'left-msb',8);
 bin_message = bin_message2(:);
N2 = length(bin_message);
% Initialize output as input
output2 = output1;
height = size(output1, 1);
width = size(output1, 2);
 
% Counter for number of embedded bits
embed_counter = 1;
and ...............
    ..............

this way I have tried to embed all 64 rows of the secret image. I want to apply a loop so that it can be done once. Can anyone help

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Answer 1

GandaBerunda 2022-7-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1763120-image-hiding-inside-an-image#answer_1010575

Hi Lilly,

One suggestion which comes on the top of my head is that you can put the steganography part of the code as a separate function. Then you can iterate through the rows of the secret image and call that function. Hope it helps.