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How to select images from nested folder?

Asked by Farman Shah on 16 Jul 2019
Latest activity Commented on by Farman Shah on 20 Jul 2019
I have a folder named AAA. Inside folder AAA there is another folder name A, inside A there is another folder B. folder B consist of 300 images. I want to get every 10th number image from folder B ( It will be 30 images) and place these images in another folder C. I need a Matlab code for this Scenario. Any help?

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2 Answers

Answer by Joel Handy on 16 Jul 2019
Edited by Joel Handy on 16 Jul 2019
 Accepted Answer

Something like this should work. You will possibly need to add code to appropriately sort your list of images. I've marked where you would do it.
imageFolder = uigetdir('', 'Select Image Folder');
destinationFolder = uigetdir(imageFolder, 'Select Destination Folder');
contents = dir(imageFolder);
fileList = contents(~[contents.isdir]);
% Sort list as needed here
filesToMove = fileList(1:10:end);
fromPaths = fullfile(imageFolder,{filesToMove.name});
toPaths = fullfile(destinationFolder,{filesToMove.name});
for fileIdx = 1:numel(fromPaths)
copyfile(fromPaths{fileIdx}, toPaths{fileIdx})
end
Also I'm note sure the specific relevance of folders AAA and A. If AAA, A, and B are all known folders and you want to create C based on them, you could replace the uigetdir code with something like
imageFolder = fullfile(AAA,A,B);
destinationFolder = fullfile(AAA,A,C);
if ~exist(destinationFolder, 'dir')
mkdir(festinationFolder);
end

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So far i have tried this code.. but it works in wrong direction. It searches for images inside the destination folder (off course can not find any image).
t=1;
% alphas are names of the folders
alphas = {'Ain';'Alif';'Bay';'Byay';'Chay';'Dal';'Ddal';'Dwad';'Fay';'Ghaf';'Ghain';'Hamza';'Hay';'Hhhay';'Kaf';'Khay';'Lam';'Meem';'Noon';'Noonghuna';
'Pay';'Qaf';'Ray';'Say';'Seen';'Sheen';'Ssay';'Swad';'Tay';'Touy';'TTay';'Wow';'Yay';'Zal';'Zay';'Zouy'}
for i=1:36 % number of folders
for j=1:1 % this is the person 1 folder named with 1 so that's why the j goes from 1:1
jj=sprintf('%d',j);
name=alphas(i);
name1 = char(name);
mkdir(jj, name1);
n=sprintf('%d',j);
mn=strcat(name,'00',n);
% number of sub folder inside each of the 36 folders..k=1 means each
% folder is having one folder inside means for folder Ain there will
% is a folder named Ain001 (1)
for k=1:1
d=sprintf('%d',k);
sf=strcat(mn,{' '},'(',d,')');
sf1=char(sf);
ffile=fullfile(jj,name1);
mkdir(ffile,sf1);
bc1=strcat(sf1,'Selected'); % this should be the new folder (Concat the Selected with the name of the folder)genrated INSIDE Ain folder
% (Remember Ain is also having the Ain001 (1)folder in it)
% From Ain001 (1) I need to select image 10,20,30,40.... means
% every 10th image and write those images inside Ain001 (1)Selected
bc1=char(bc1);
bc=strcat(ffile,'\',bc1);
bc=char(bc);
mkdir(bc);
fullname2 = fullfile(ffile,'\',sf1);
fullname4=fullfile(ffile,'\',ffsc1);
fullname5=fullfile(ffile,'\',bc1);
numf=dir([fullname5 '/*.jpg']);
numfs=size(numf,1);
nums=numfs/10;
for ii=1:nums
nn=sprintf('%d',ii*10);
filename1 = [sprintf('%d',ii) '.jpg'];
path = fullfile(fullname5,'',filename1);
im=imread(path);
nn=sprintf('%d',t);
filename1=strcat(nn,'.jpg');
pathsel=fullfile(fullname2,filename1);
imwrite(im,pathsel);
t=t+1;
end
end
end
end
I'm having a little trouble following this. There is a lot of extra code. For example:
jj=sprintf('%d',j);
name=alphas(i);
name1 = char(name);
mkdir(jj, name1);
could just be
% Make a folder '1' inside user folder
mkdir(num2str(j),alphas{i});
Another problem I think you're having is that your inputs to mkdir appear to be backwords. The format mkdir is mkdir(parent directory, new folder) so mkdir('C:\MyExistingFolder', 'NewFolder') would create 'C:\MyExistingFolder\NewFolder';
You could also just do mkdir(['C:\MyExistingFolder' filesep 'NewFolder']) or mkdir(fullfile('C:\MyExistingFolder', 'NewFolder').
Why are you using imread and imwrite instead of copyfile to move the image files? Are you actually doing some processing on these images in your real application?
Yeah I was doing a project and it is done now. Thank you
your code was good. For those others comming on this thread, it is helpfull.

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Answer by Image Analyst
on 18 Jul 2019

Have you looked at imageDatastore()? Or dir() using two asterisks as the file pattern?

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