How to use cat() function inside loop for stacking of 2D images ?

Dear experts,

I have 48 no. of '.png' images in a folder.Name of each image is 0001.png....0048.png. I used the following code to import all the images.

% Specify the folder where the files live. myFolder = 'C:\Users\yourUserName\Documents\My Pictures'; % Check to make sure that folder actually exists. Warn user if it doesn't. if ~isdir(myFolder) errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder); uiwait(warndlg(errorMessage)); return; end % Get a list of all files in the folder with the desired file name pattern. filePattern = fullfile(myFolder, '*.png'); % Change to whatever pattern you need. theFiles = dir(filePattern); for k = 1 : length(theFiles) baseFileName = theFiles(k).name; fullFileName = fullfile(myFolder, baseFileName); fprintf(1, 'Now reading %s\n', fullFileName); % Now do whatever you want with this file name, % such as reading it in as an image array with imread() imageArray = imread(fullFileName); imshow(imageArray); % Display image. drawnow; % Force display to update immediately. end

Now please guide me, how to use cat() to stack all the 48 images inside the loop. What will be exact command I should use. All images are grayscale image.

Thanking you in advance and Happy new year 2017.

[Jan]

Please learn how to format code in the forum. Then it will be readable.

http://www.mathworks.com/matlabcentral/answers/13205#answer_18099

Answer 1

[Image Analyst]

I already told you how to do it here: http://www.mathworks.com/matlabcentral/answers/318606-how-to-import-an-image-sequence-having-30-number-of-tiff-images-which-are-saved-in-matlab-current-di#comment_417445. Here it is again:

Assuming the files are grayscale, not color, make a 3D array inside the loop just after you read in the image with imread():

if k == 1
    [rows, columns, numberOfColorChannels] = size(imageArray);
    allImages = zeros(rows, columns, length(theFiles)); % Preallocate space
end
% Insert image into the proper plane
allImages(:, :, k) = imageArray;