Reading Multiple Images from Folder

Asked by Chandra Shekhar on 25 Jan 2013

Latest activity Edited by Stephen Cobeldick on 27 May 2015

8 views (last 30 days)

I have a folder named 'ImageSet1',it consist of 20 images named as a 1.jpg,2.jpg...20.jpg.

Here i want to read images from 1 to 10 and then from 11 to 20 separately. it means, when i read image 1,immediately i have to read 11th image and when i read image 2,immediately i have to read 12th image in a loop and so on.. Here is the my code

sdirectory = 'ImageSet1';

jpegfiles = dir([sdirectory '/*.jpg']);

for k = 1:length(jpegfiles)/2

filename = [sdirectory '/' jpegfiles(k).name];

I = imread(filename);

figure;imshow(I)

filename1=[sdirectory '/' jpegfiles(10+k).name];

I1=imread(filename1);

figure;imshow(I1)

end

This code is not reading in order,like 1 and 11th image,2 and 12th image...

Does any one know please correct this code or any other method..?

2 Comments

Stephen Cobeldick on 27 May 2015

A simple solution is to use my FEX submission natsortfiles

http://de.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort

It sorts according to any numeric values in the strings, and also sorts the file extensions separately:

B = {'test2.m'; 'test10-old.m'; 'test.m'; 'test10.m'; 'test1.m'};
sort(B) % wrong numeric order!
 ans = {
    'test.m'
    'test1.m'
    'test10-old.m'
    'test10.m'
    'test2.m'}
natsortfiles(B) % correct numeric order and shortest first:
 ans = {
    'test.m'
    'test1.m'
    'test2.m'
    'test10.m'
    'test10-old.m'}

Stephen Cobeldick on 27 May 2015

A simple solution is to use my FEX submission natsortfiles

http://de.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort

It sorts according to any numeric values in the strings, and also sorts the file extensions separately:

B = {'test2.m'; 'test10-old.m'; 'test.m'; 'test10.m'; 'test1.m'};
sort(B)
 ans = {
    'test.m'
    'test1.m'
    'test10-old.m'
    'test10.m'
    'test2.m'}
natsortfiles(B) % correct numeric order and shortest first:
 ans = {
    'test.m'
    'test1.m'
    'test2.m'
    'test10.m'
    'test10-old.m'}

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2 Answers

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Answer by Evgeny Pr on 25 Jan 2013

Edited by Evgeny Pr on 25 Jan 2013

Use natural sorting for image filenames.

http://www.mathworks.com/matlabcentral/fileexchange/10959-sortnat-natural-order-sort

Listing = dir(fullfile(directoryPath, '*.jpg'));
names = {Listing.name}';
names = sort_nat(names);
fullNames = cellfun(@(x) fullfile(directoryPath, x), names, 'UniformOutput', 0);

0 Comments

Link

Answer by azizullah khan on 29 Nov 2013

dear sir kindly explain me names={listing.name} what does it means

1 Comment

Image Analyst on 29 Nov 2013

See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

and this:

http://blogs.mathworks.com/pick/2006/09/11/file1-file10-file2-sorting-problem-solved/

You are now following this question

Chandra Shekhar (view profile)