MATLAB: How to access multiple images in a single code

faq4.12for loopimage processingImage Processing Toolbox

Hello Mathworks,

My question might sound a little bit odd but what I meant to say was if I have a group of 25 images in a single folder and if I have to calculate say max pixel or min pixel of every image then do I need to write min(x1) min(x2) ….. min(x25) or is there anyway with which I could write a code once and repeat it for other 24 images ?

I have had this doubt for quite a long time so now I am waiting to see some interesting facts 🙂

Thanks All

Best Answer

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

FAQ 4.12

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MATLAB: Help with image processing code

b = rgb2gray(a);

To read a bunch of images, please see this FAQ

MATLAB: How to store images in a single array or matrix

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.

Best Answer

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MATLAB: Help with image processing code

MATLAB: How to store images in a single array or matrix

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