Can I embed a image in the following algorithm?

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)

Answer 1

[Walter Roberson]

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.

[akash bais]

you are right sir, but i am not able to understand where to input image data in the algorithm, i want to remove the data and insert image data

[Walter Roberson]

I am not certain but I think the data that is currently being embedded is the result of rgb2ind() of the original image, which is stored in the variable Z. It is difficult to tell. Unfortunately the code is not documented or commented.

[akash bais]

I can upload the commented code if you want

[Walter Roberson]

Replace

[Z,map]=rgb2ind(A,256);

With assigning the desired data to Z