Files in different folders

If you have 12 different folders (that each contain pictures), is there a way to create a loop that will sum up the first images in all the folders, and the sum of the second images in all the folders, etc... for all the images?

Answer 1

[Sean de Wolski]

http://www.mathworks.com/matlabcentral/answers/57446

http://www.mathworks.com/help/releases/R2013a/matlab/import_export/process-a-sequence-of-files.html

Answer 2

[Azzi Abdelmalek]

folders={f1,f2,f3}; % your folders
for k=1:numel(folders)
  f=dir([folders{k} '/*.jpg']);
files{k}={f.name};
end
for ii=1:numel(files{1});
  im{ii}=0;
  for  jj=1:numel(files)
      im{ii}=im{ii}+imread(files{jj}{ii});
  end
end

Answer 3

[Image Analyst]

You can take the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F and adapt it to use genpath() to get all subfolders.

[Jenna]

My problem is that I want to read in the files using imread, which will create a matrix with data about the pixels. I also want to read in data for 135 pictures. How do I create a scenario where I will have an array of 135 x 1, where each row will actually be its own matrix of data on pixels?

[Image Analyst]

If they're grayscale:

oneRow = grayImage(theRowNumber, :);

If they're color

oneRowRed = rgbImage(theRowNumber, :, 1);
oneRowGreen = rgbImage(theRowNumber, :, 2);
oneRowBlue = rgbImage(theRowNumber, :, 3);