explain any one,plz

function [newimg] = embedding(cov_img, secret_img)
%%Embedding image inside images
size_sec = size(secret_img);
secret1d = reshape(secret_img, 1, size_sec(1)*size_sec(2));
%Declaration of variables to control the insertion of encrypted image into
%the cover image
[siz1, siz2, ~] = size(cov_img);
plane = 1;
colplane = cov_img(:,:,plane);
newimg = []; %Output image - cover image with secret image embedded in it
c1 = 1; c2 = 1;

%% Embedding the secret image in the least significant bits of the cover image
for i = 1:length(secret1d)
    temp = de2bi(secret1d(i), 8);
    for j = 8:-1:1
        val = colplane(c1, c2);
        val = floor(double(val)/2) * 2;
        colplane(c1, c2) = bitor(val,temp(j));
        c2 = c2+1;
        if c2 > siz2
            c2 = 1;
            c1 = c1 + 1;
            if c1 > siz1
                c1 = 1;
                c2 = 1;
                newimg = cat(3, newimg, colplane);
                plane = plane + 1; %Embedding it in the next plane on exhaustion of current plane
                colplane = cov_img(:,:,plane);
            end
        end        
    end    
end
newimg = cat(3, newimg, colplane);
%Inserting back the remaining color plains into the output image
for i = plane+1:3
    newimg = cat(3, newimg, cov_img(:,:,i));
end

imwrite(newimg, '3-embedded_image.tif');

[Rik]

If you don't ask a specific question, people will likely ingore your question. Have a read here (or here for more general advice). It will greatly improve your chances of getting an answer.

Also, this is about cryptography, which can have issues and may result in fewer people trying to answer your question in the first place.

Please read the links I provided and then edit your question accordingly. Once you edit your question it will automatically re-open.