plz,explain the code.

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关闭： Rik 2019-1-28

function [secret_img] = lsbstego(secret_img, text)

%% Data Hiding

secret_img=double(secret_img);

val = [double(text) 0]; %Coverting secret text to ASCII representation

[~, siz2] = size(secret_img);

i = 1; j = 1;

for y = 1:length(val)

data = val(y); %data is the character in the secret text to be hidden

bit = 128; %Counter variable

while bit > 0 %Clearing the LSB of a pixel

secret_img(i, j) = floor(secret_img(i, j)/2);

secret_img(i, j) = secret_img(i, j)*2;

if bitand(data, bit) > 0 %Setting the LSB of pixel to the information bit

secret_img(i, j) = secret_img(i,j)+1;

end

j = j+1;

if j > siz2

i = i+1;

j = 1;

end

bit = floor(bit/2);

end

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