MATLAB: RGB32 To Grayscale 12 bit conversion

imageimage acquisitionImage Acquisition Toolboximage analysisimagesc

Can anyone help to convert a 32 bit RGB format to 12 bit Grayscale format . It is possible in Matlab ??

Best Answer

Here's one way:

rgbImage8Bit = imread(fullFileName);
grayImage = rgb2gray(im2double(rgbImage8Bit));
% It's still in the original range.
% Scale it to be in the larger 16 bit image range.
grayImage = uint16(grayImage * 65535);
fprintf('The class of grayImage is %s.\n', class(grayImage));

but that's not the same as having a 16 bit grayscale camera like you were asking about in your other post.

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MATLAB: How to change 1 channel image to 3 channel

Try cat() to stack the gray scale image into 3 slices (color channels):

rgbImage = cat(3, grayImage, grayImage, grayImage);

It will be an RGB image though the only colors will be gray since there is no difference between the three different color channels. It will be a 3-D image with the z-direction (third index) being the color channel index.

MATLAB: Exchange bit-planes

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');

Best Answer

Related Solutions

MATLAB: How to change 1 channel image to 3 channel

MATLAB: Exchange bit-planes

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