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How to read images in a folder

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I am a student and I need to find the code to read the images in a file in order to do cropping. In here I named my images as
user001-02.bmp etc.
I need help for this because I'm a beginner to MATLAB.

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Accepted Answer

Michelle Hirsch
Michelle Hirsch on 25 Jan 2011
Nilushi -
We won't be able to hand you a complete answer, but can give some pointers. Here's a code snippet that shows common patterns for reading data from files. There are a bunch of concepts you are going to want to learn about to understand this code:
  • Working with structures. When you get a list of image files, their names will be stored inside of a structure.
  • Working with cell arrays. We'll use a cell array to store the data coming from the different images, since it allows for each image to be a different size. If you happen to know that all of your images are exactly the same size you can use a regular numeric array instead.
% Get list of all BMP files in this directory
% DIR returns as a structure array. You will need to use () and . to get
% the file names.
imagefiles = dir('*.bmp');
nfiles = length(imagefiles); % Number of files found
for ii=1:nfiles
currentfilename = imagefiles(ii).name;
currentimage = imread(currentfilename);
images{ii} = currentimage;
Best of luck! - scott
Hasaan Ijaz
Hasaan Ijaz on 12 Sep 2020
Worked for me as well. Thank you!

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More Answers (5)

Sebastian on 25 Jan 2011
There might be different ways to do this. An easy one is
for a = 1:10
filename = ['user001-' num2str(a,'%02d') '.bmp'];
img = imread(filename);
% do something with img
Liu Sam
Liu Sam on 4 Mar 2018
Thank you! This is the exact answer I want!

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Walter Roberson
Walter Roberson on 25 Jan 2011
Please check the FAQ on this topic
  1 Comment
Nilushi Dissanayake
Nilushi Dissanayake on 25 Jan 2011
thank you very much,,

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George on 24 Sep 2016
You can try ImageDatastore
Walter Roberson
Walter Roberson on 11 Sep 2017
Before R2015a, the closest equivalent was the dataset array from the Statistics toolbox.

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Paul De
Paul De on 9 Nov 2017
THANK YOu! I've been looking for a long time the solution of this problem)

Ashraf Rayed
Ashraf Rayed on 12 May 2020
okay it is awesoe coding. Thanks a lot. I have a question here, look here we will read some pictures of a folder and we will get some output also of those pictures. Can we save those data sequentially in a xcel sheet??


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