Compare two folders for matching images

Hi there,

I have two folders of images and I want to save the images from folder 1 that have the same names in folder 2 into another folder.

For examples Folder 1 contains 2600 images and folder 2 contains 1300 images. I tried to write the code but I got

Matrix dimensions must agree.
Error in Untitled (line 15)
       if im_name1 == im_name2

clc;
clear all;
out_path ='____\New folder\';
folder1 = '____\folder1\';
folder2 = '____\folder2\';
fileInfo1 = dir(fullfile(folder1, '*.jpg'));
fileInfo2 = dir(fullfile(folder2, '*.jpg'));
for k = 1 : length(fileInfo1)
    for k2 = 1 : length(fileInfo2)
        im = imread([folder1 fileInfo1(k).name]);
      im_name1 = [fileInfo1(k).name(1:end-4) '.jpg'] ;
      im_name2 = [fileInfo2(k2).name(1:end-4) '.jpg'];
       if im_name1 == im_name2
 imwrite(im, fullfile(out_path, im_name2));
      end
         fprintf('Processing: %d/%d\n', k2,length(fileInfo2));
    end
end

How to solve this issue?

Answer 1

[Walter Roberson]

Use strcmp() to compare character vectors.

Or convert to string, such as

      im_name1 = fileInfo1(k).name(1:end-4) + ".jpg" ;
      im_name2 = fileInfo2(k2).name(1:end-4) + ".jpg";

[Walter Roberson]

But you can do even better: you can avoid the loop using ismember()

names1 = {fileInfo1.name};
names2 = {fileInfo2.name};
is_present = ismember(names1, names2);
same_names = names1(is_present);
source_names = fullfile(folder1, same_names);
dest_names = fullfile(out_path, same_names);
cellfun(@(s,d) copyfile(s,d), source_names, dest_names);

[Ren]

Thank you so much :) greatly appreciated !