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Compare two folders for matching images

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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
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));
fprintf('Processing: %d/%d\n', k2,length(fileInfo2));
How to solve this issue?

Accepted Answer

Walter Roberson
Walter Roberson on 13 Aug 2021
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
Walter Roberson on 13 Aug 2021
But you can do even better: you can avoid the loop using ismember()
names1 = {};
names2 = {};
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 on 14 Aug 2021
Thank you so much :) greatly appreciated !

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