how can save some 3d images in a 4d array?

how can save some 3d images in a 4d array? I use this code:

if true
folder = 'C:\Users\sara\Desktop\inodastnazan\azmayeshi';
files = dir([folder '\*.tiff']);
array4d = zeros(512, 512,3, numel(files));

 for slice = 1:numel(files)
  filename = [folder files(slice).name];  
   array4d(:,:,:,slice) = strcat(filename) ;
 end end

but I have this error

if true
  Subscripted assignment dimension mismatch.  
end

.... thanks

Answer 1

[Image Analyst]

You're not even reading in the images. You're just concatenating filename strings. Try inserting images.

folder = 'C:\Users\sara\Desktop\inodastnazan\azmayeshi';
files = dir(fullfile(folder, '*.tiff'));
array4d = zeros(512, 512,3, numel(files));
% Loop over filenames, inserting the image.
for slice = 1 : length(files)
  filename = fullfile(folder, files(slice).name);
  thisImage = imread(filename);
  [rows, columns, numberOfColorChannels) = size(thisImage);
  if numberOfColorChannels < 3
    message = 'Error: Image is not RGB Color!';
    uiwait(warndlg(message));
    continue;
  end
  if rows ~= 512 || columns ~= 512
    message = 'Error: Image is not 512x512!';
    uiwait(warndlg(message));
    continue; % Skip this image.
  end
  % Image is okay.  Insert it.
  array4d(:,:,:,slice) = thisImage;
end

[sara]

Image Analyst

Endless thanks