How to retrieve images with the same name from multiple folders?

I have nine different folders, each containing hundreds of images. I suspect there are a few images with the same names that are present in two or more folders. How do I retrieve only those images that are present in these nine different folders?

Answer 1

[Walter Roberson]

Untested.

projectdir = '/Users/siv/PhD/part11';

dinfo = dir(projectdir);
dinfo(~[dinfo.isfolder]) = [];   %remove non-folders
dinfo( ismember({dinfo.name}, {'.', '..'}) ) = [];   %delete . and ..

subdirnames = {dinfo.name};
fqsubdirnames = fullfile(projectdir, subdirnames);

numsubs = length(subdirnames);
subinfo = cell(numsubs, 1);

for K = 1 : numsubs
  thisinfo = dir(fqsubdirnames{K});
  thisinfo( [thisinfo.isdir] ) = [];  %remove folders. This includes . and ..
  subinfo{K} = {thisinfo.name};
end

allnames = horzcat(subinfo{:});
numents = cellfun(@length, subinfo);
group_breakpoints = cumsum([1; numents(:)]) .' ;

[unames, ~, uidx] = unique(allnames);
counts = accumarray(uidx, 1);

dupidx = find(counts > 1);

if isempty(dupidx)
   fprintf('No duplicate names!\n');
else
  fprintf('Some duplicates found!\n\n');

    for K = 1 : length(dupidx)
      orig_idx = find(uidx == dupidx(K));
      [~, folderidx] = histc(orig_idx, group_breakpoints);
     fprintf('file "%s" found in the following folders:\n', unames{dupidx(K)} );
      fprintf('  %s\n', subdirnames{folderidx} );
    end
    fprintf('\n');
  end

[Sivaramakrishnan Rajaraman]

Thanks, it works, however, I aim to write these duplicate images to a different folder. How to do that?

[Walter Roberson]

Which folder should they be written to, and what should the file names become in the new folder (cannot use the original name since we already know the names are the same...)

[Sivaramakrishnan Rajaraman]

Thanks for the response. I'm running the code to run the pairwise comparison of different folders that I have. I would prefer to name the new folder as "duplicate" and the duplicated images would have the tag "duplicate_" preceeding the original file names.

[Image Analyst]

Images can have the same name and not be duplicates so you might want to check the dates, CRC, etc. Just construct the output folder name, full file name, and then call imwrite():

Something like

outputFolder = '/Users/siv/PhD/part11/Duplicate Images'  % Wherever you want.
baseFileName = sprintf('duplicate_%s', originalBaseFileName);
fullFileName = fullfile(outputFolder, baseFileName);
imwrite(theImage, fullFileName);

Obviously make needed variable name changes as appropriate.

[Sivaramakrishnan Rajaraman]

I'm running your main code that prints the "unames{dupidx(K)}" and the sub directory names "subdirnames{folderidx}". In that context, if I'm to use to above code into the last for loop of your code, what should be the originalBaseFileName?