How to store images in a single array or matrix?

Bashir - 2022-11-22T10:27:13+00:00

Question: How to store images in a single array or matrix?

Hello, i have a number of jpeg images stored in a folder; how can i read all the images and store them as a single matrix or array (reserving the image format).  

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Expert Answer

Prashant Kumar answered . 2025-11-20

Straight out of the FAQ:

 

myFolder = 'C:\Documents and Settings\yourUserName\My Documents\My Pictures';
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
filePattern = fullfile(myFolder, '*.jpg');
jpegFiles = dir(filePattern);
for k = 1:length(jpegFiles)
  baseFileName = jpegFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  imageArray = imread(fullFileName);
  imshow(imageArray);  % Display image.
  drawnow; % Force display to update immediately.
end

Obviously, you can adapt as needed, because I'm not sure what you mean when you say "store them as a single matrix". There is a montage() function that will do that if that's what you want. It will stitch together all the image files into one giant image.

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