what is code in matlab to embed and extract a watermark using lsb method?

how can i embed a watermark in an image using least significant bit method?

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See demo which does that.

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
imtool close all;  % Close all imtool figures.
clear;  % Erase all existing variables.
workspace;  % Make sure the workspace panel is showing.
fontSize = 12;

% Read in the image what will have another image hidden into it.
baseFileName='moon.tif';
% baseFileName='cameraman.tif';
folder = fullfile(matlabroot, '\toolbox\images\imdemos');
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
if ~exist(fullFileName, 'file')
	% Didn't find it there.  Check the search path for it.
	fullFileName = baseFileName; % No path this time.
	if ~exist(fullFileName, 'file')
		% Still didn't find it.  Alert user.
		errorMessage = sprintf('Error: %s does not exist.', fullFileName);
		uiwait(warndlg(errorMessage));
		return;
	end
end
originalImage = imread(fullFileName);
% Get the number of rows and columns in the original image.
[visibleRows, visibleColumns, numberOfColorChannels] = size(originalImage);
if numberOfColorChannels > 1
	% If it's color, extract the red channel.
	originalImage = originalImage(:,:,1);
end
% Display the original gray scale image.
subplot(3, 3, 4);
imshow(originalImage, []);
title('Original Grayscale Starting Image', 'FontSize', fontSize);
% Enlarge figure t

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what is code in matlab to embed and extract a watermark using lsb method?

what is code in matlab to embed and extract a watermark using lsb method?