pixel dimension

Can someone please tell me how to make the two images of same dimension to fuse it in matlab??One image has 148*114*3 dimension and the other has 148*114 dimension.

[Jonathan Sullivan]

Parul, What do you mean by "fuse" the images?

[parul]

Fuse the images means that we are taking the infrared image and the brightness component from the rgb image and then using the discrete wavelet frame based fusion method,we are fusing those two images.But the problem is dat these two images dat need to be fused are not of same dimensions.How can i do dat??

[Image Analyst]

But you said they were both 148 by 114 so they ARE of the same lateral dimensions. It's just that one is color and one is grayscale. Perhaps you meant "field of view" rather than "dimension"???

Answer 1

[Walter Roberson]

Suppose the 148*114 image is named image2. Then

image2_3d = cat(3, image2, image2, image2);

Then image2_3d will be the same dimension as your 148 * 114 * 3 image.

Note: given your description of what you need to do, I think you will find that this does not do anything useful for you, but it will at least give you two images "of the same dimension" that you can use to get to the point of understanding yourself why that isn't what you need.

[parul]

Thanx alot...It was really useful.

Answer 2

[Image Analyst]

You could average the grayscale image in with each of the color channels (make sure you cast to single or double before doing that though or you'll get clipping), or you could replace one of the color channels. What do you want to do? See this demo code:

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 = 20;

% Read in a standard MATLAB gray scale demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');
baseFileName = 'cameraman.tif';
fullFileName = fullfile(folder, baseFileName);
% 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, 2, 1);
imshow(grayImage, []);
title('Original Grayscale Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
% Give a name to the title bar.
set(gcf,'name','Demo by ImageAnalyst','numbertitle','off') 

% Read in a standard MATLAB color demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');
baseFileName = 'peppers.png';
fullFileName = fullfile(folder, baseFileName);
% 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
rgbImage = imread(fullFileName);
% Resize the image to be the same as the gray scale image.
rgbImage = imresize(rgbImage, [rows columns]);
% Get the dimensions of the image.  numberOfColorBands should be = 3.
[rows columns numberOfColorBands] = size(rgbImage);
% Display the original color image.
subplot(2, 2, 2);
imshow(rgbImage, []);
title('Original Color Image', 'FontSize', fontSize);

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);

% Method 1: Average the images
redChannel2 = (single(redChannel) + single(grayImage)) / 2;
greenChannel2 = (single(greenChannel) + single(grayImage)) / 2;
blueChannel2 = (single(blueChannel) + single(grayImage)) / 2;

aveRGBImage = cat(3, uint8(redChannel2), uint8(greenChannel2), uint8(blueChannel2));
% Display the new color image.
subplot(2, 2, 3);
imshow(aveRGBImage, []);
title('Averaged Color Image', 'FontSize', fontSize);

% Method 2: replace one channel, say the green.
newRGBImage = cat(3, uint8(redChannel), uint8(grayImage), uint8(blueChannel));
% Display the new color image.
subplot(2, 2, 4);
imshow(newRGBImage, []);
title('Green-replaced Color Image', 'FontSize', fontSize);

[Image Analyst]

It would have been nice of you to mention "discrete wavelet frame based fusion method" in your initial post. Please ignore all the demo code I gave you above.

Answer 3

[James morgenstern]

You need to 'Resample' one or both images to match resolution. Then you need to make them the same size in order to register them. Matlab has demos on image registration.