Can I embed a image in the following algorithm?

Question

akash bais 2017-1-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/321537-can-i-embed-a-image-in-the-following-algorithm

评论： Walter Roberson 2017-1-25

I have successfully added data into the image using the following code and algorithm image is attached below but now I want to embed an image inside an image (steganography) Please suggest proper method to do it

instead of data, Please suggest a method

clc;
clear all;
fprintf('The image matrix A-');
fprintf('\n');
A=imread('airplane.bmp');
figure(1), imshow(A); title('Original Image (Cover Image)');
[Z,map]=rgb2ind(A,256);
p=size(Z);
disp(p);
B=Z;
B(2:2:end,:) = fliplr(Z(2:2:end,:));
C=reshape(B',1,[]);
disp(Z)
fprintf('Inverse S-scan of A-');
fprintf('\n');
disp(C);
fprintf('Size Of Inverse S-scan Matrix-');
fprintf('\n');
z=size(C);
t=z(1)*z(2);
disp(t);
for n=1:1:t
    if (n==1)
       D(n)=C(1,1);
    elseif n>1
        D(n)=C(1,(n-1))-C(1,n);
    end
end
for n=1:1:t
    if (n==1)
        E(n)=D(1,1);
    else
        if(D(n)>0)
        E(n)=D(1,n)+1;
        else
        E(n)=D(1,n);
        end
    end
end
for n=1:1:t
    if(n<2)
        F(n)=E(1,n)+1;
    else
    F(n)=E(n);
    end
    end
for n=1:1:t
    if(n==1)
        G(n)=F(1,1);
    else
        G(n)=C(1,n-1)-F(1,n);
    end
end
M=reshape(G,p(1),p(2));
M(:,2:2:end)=flipud(M(:,2:2:end));
M=M.';
N=ind2rgb(M,map);
figure(2);imshow(N);title('Stego Image');
peaksnr = psnr(M,B)
err = immse(M,B)

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Answer 1

Walter Roberson 2017-1-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/321537-can-i-embed-a-image-in-the-following-algorithm#answer_251596

Images are just a type of data. Reshape it to a vector if you need to. If the image size is not fixed then be sure to embed information about the image size.