How to take image from multi folders?

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D. Frank
D. Frank 2020-6-19
评论： D. Frank 2020-6-22
Hi everybody
I have a few thousand folders, each folder contains 2 images with information in their name, i want to take randomly 1 image from each folder and put all the taken images into one new folder in desktop for further calculation, please help, thank you very much.
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Rik
Rik 2020-6-21
You mean you want to read an image? If you know the file names you can just use imread.
D. Frank
D. Frank 2020-6-22
Read image is the next step of computing these files, the main thing i want to do is taking 1 random image from each subfolder, and there are 2900 subfolders in 1 folder to add to path in matlab :((((((

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Monalisa Pal
Monalisa Pal 2020-6-21
编辑：Monalisa Pal 2020-6-22
Hi,
'fetching a random image' part of the following code may help you
clearvars -global
clearvars
close all
clc
% creating destination folder
destination = 'destinationfolder';
mkdir(destination);
n_folders = 10; % say there are 10 folders
for i = 1:n_folders
% fetching the contents of the folders
foldername = ['folder_', num2str(i), '/'];
path = [foldername, '*.png']; % or other imgfile extensions
contents = dir(path);
% fetching a random image
if numel(contents) < 2
error([foldername, ' has only ', num2str(numel(contents)), ' image files']);
end
img_index = randi([1, numel(contents)], 1);
disp(['From ', foldername, ' copying ', contents(img_index).name]);
source = [foldername, contents(img_index).name];
copyfile(source, destination);
end
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Monalisa Pal
Monalisa Pal 2020-6-22
Mr. Frank, I misunderstood the directory structure earlier. Lets see if this works.
clearvars -global
clearvars
close all
clc
% creating destination folder
destination = 'Images_place';
mkdir(destination);
folder = 'Bigfolder';
sub_folders = dir(folder);
%n_folders = 2950; % say there are 2950 folders
% n_folders = numel(sub_folders) - 2;
exts = {'*.jpg', '*.gif', '*.png', '*.jpeg', '*.bmp'};
for i = 3:numel(sub_folders)
% fetching the contents of the folders
foldername = ['Bigfolder/', sub_folders(i).name, '/'];
contents_parts = cellfun(@(E) dir( fullfile(foldername, E) ), exts, 'uniform', 0);
contents = vertcat(contents_parts{:});
% fetching a random image
if isempty(contents)
fprintf(1, 'caution: folder "%s" had no useable images\n', foldername);
continue;
end
img_index = randi([1, numel(contents)], 1);
disp(['From ', foldername, ' copying ', contents(img_index).name]);
filename = fullfile(foldername, contents(img_index).name);
copyfile(filename, destination);
end
D. Frank
D. Frank 2020-6-22
Dear Ms. Monalisa Pal and Mr. Roberson, the code ran smoothly, thank you very much for your patience and your help.

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