subset of pictures into one picture

Hi,

I'm new to matlab and I need to program an experiment in our lab. I have 4 sets of 8 pictures. I need to create 30 pictures, such that each picture containing 4 subsets of 4 (with no replacement) from each set (matrix of 4*4 pictures). the pictures shall be chosen randomly and the number of appearances of each picture must be same. How do i do it? I found the function "randperm" to get the subsets, but I still need to figure out the other parts.

Thanks,

Itzik

Answer 1

[Image Analyst]

Here's a good start:

folder = pwd; % Wherever...
filePattern = fullfile(folder, '*.*'); % Or *.PNG or whatever extension you want.
baseFileNames = dir(filePattern)
numberOfFiles = length(baseFileNames)
numberOfOutputImages = 30;
if numberOfOutputImages > floor((numberOfFiles-3)/4)
  numberOfOutputImages = floor((numberOfFiles-3)/4)
end
theOrder = randperm(numberOfFiles, numberOfOutputImages*4)
for k = 1 : numberOfOutputImages
  index = (k-1)*4+1
  filename1 = fullfile(folder, baseFileNames(theOrder(index)).name)
  filename2 = fullfile(folder, baseFileNames(theOrder(index + 1)).name)
  filename3 = fullfile(folder, baseFileNames(theOrder(index + 2)).name)
  filename4 = fullfile(folder, baseFileNames(theOrder(index + 3)).name)
  allFilenames = {filename1, filename2, filename3, filename4}
  % Display a montage of the 4 images.
   montage(allFilenames);
%  Use export_fig() if you want to save the 4 image montage.
end

[Itzik]

thanks, it looks like really good starting point for me.