Exchange bit-planes

hey everyone

how to Exchange the third and the fifth bit-planes of a gray-scale image using bitget and bitset ??

thanks in advance

Answer 1

[Image Analyst]

Here's one way:

% Demo to extract and swap bitplanes in a gray scale image.

clc;    % Clear the command window.
workspace;  % Make sure the workspace panel is showing.
fontSize = 20;

% Read in a standard MATLAB gray scale demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');
button = menu('Use which demo image?', 'CameraMan', 'Moon', 'Eight', 'Coins', 'Pout');
if button == 1
	baseFileName = 'cameraman.tif';
elseif button == 2
	baseFileName = 'moon.tif';
elseif button == 3
	baseFileName = 'eight.tif';
elseif button == 4
	baseFileName = 'coins.png';
else
	baseFileName = 'pout.tif';
end

% Read in a standard MATLAB gray scale demo image.
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
grayImage = imread(fullFileName);
% Get the dimensions of the image.  numberOfColorBands should be = 1.
[rows columns numberOfColorBands] = size(grayImage);
% Display the original gray scale image.
subplot(2, 1, 1);
imshow(grayImage, []);
title('Original Grayscale Image', 'FontSize', fontSize);

% Get the 3rd bitplane
bitPlane3Image = bitget(grayImage, 3);
% Get the 5th bitplane
bitPlane5Image = bitget(grayImage, 5);
% Make the 3rd bitplane the 5th one.
grayImage = bitset(grayImage, 3, bitPlane5Image);
% Make the 5th bitplane the 3rd one.
grayImage = bitset(grayImage, 5, bitPlane3Image);

% Display the original gray scale image.
subplot(2, 1, 2);
imshow(grayImage, []);
title('Modified Grayscale Image', 'FontSize', fontSize);
fprintf('Done running %s.m.\n', mfilename);
msgbox('Done with demo');

[Brahim Aboumouadine]

thank you , this demo is really helpful :)