How to read images sequentially from a folder?
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sourcefolder = 'E:\images';
filepattern = fullfile(sourcefolder, '*.png');
outputfolder = 'E:\images2';
srcFiles = dir(filepattern);
numImages = length(srcFiles);
for k = 1 : numImages
inputfilename = fullfile(sourcefolder, srcFiles(k).name);
outputfilename = fullfile(outputfolder, sprintf('histo_%d.png',k));
.....
....
....
end
My folder containing 1400 images. Whenever I am reading images using the above code and after performing any image processing its not happening sequentially. How can read images by one by one maintaing the sequence and can write to them by maintaining the same order.
2 Comments
Accepted Answer
Stephen23
on 5 Jul 2022
Edited: Stephen23
on 6 Jul 2022
You can download the file NATSORTFILES by clicking the big blue download button here:
then unzip the file onto the MATLAB search path (e.g. into the current directory), and then use it like this:
srcFiles = dir(filepattern);
srcFiles = natsortfiles(srcFiles);
More Answers (2)
Pooja Kumari
on 5 Jul 2022
Edited: Pooja Kumari
on 5 Jul 2022
Dear Zara Khan,
It is my understanding that you want to access the images present in the folder sequentially and after performing some operations, you want to store the output image in ‘output filename’.
But the issue you were facing is that when you are reading images using the provided code and after getting the input file name and performing some image processing, you were not getting the output sequentially is because the files stored in input file name is not sequential.
You can refer to the updated code given below:
sourcefolder = 'E:\images'; %path of your source folder
filepattern = (fullfile(sourcefolder, '*.png'));
srcFiles = dir(filepattern);
numImages = length(srcFiles);
outputfolder = 'E:\images2';
for i= 1: numel(srcFiles)
I =(imread(strcat(sourcefolder,'/',srcFiles(i).name)));
outputfilename = fullfile(outputfolder, sprintf('histo_%d.png',i));
.....
....
...
end
Please find attached a reference code for the above issue you were facing:
% I have 50 images named numerically '15_1_s', '15_2_s', ... '15_50_s' but
% the order in which these files are stored is shown in the image below:
path = '/MATLAB Drive/CV_Assignment2/dd/dd';
folder = (path);
files = dir(fullfile(folder,'*.jpg'));
nfiles = length((files));
mkdir(['Outputfolder',sprintf('%d',outputfolder)]); % similar to outputfolder.
for i= 1: numel(files)
I =(imread(strcat(path,'/',files(i).name)));
imwrite(imgx,strcat(path_output,'/',files(i).name));
%output will be stored sequentially .
end
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1055240/image.jpeg)
For more information on how to sort files stored in a directory , you can refer to the below link:
You can refer to this file, if you want to sort the input files naturally:
Sincerely,
Pooja Kumari
Chunru
on 5 Jul 2022
Edited: Chunru
on 5 Jul 2022
% create some files
system('touch a.png');
system('touch c.txt');
pause(1) % make sure b is newer in datenum
system('touch b.txt');
pause(.5)
% get the files
f = dir('*.*');
{f.name}
% sort according to name
[~, idx] = sort({f.name})
fname = {f(idx).name}
% sort according to datetime
[~, idx] = sort([f.datenum])
fname = {f(idx).name}
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