How to read images in a folder

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Nilushi Dissanayake 2011-1-25

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回答： DGM 2023-6-24

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

 user001-01.bmp
 user001-02.bmp etc.

I need help for this because I'm a beginner to MATLAB.

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naila 2023-6-24

hi,

i have some jpeg images in a folder (saved in C drive),using imread command in matlab 2018 but its not working.

please help me out.

Image Analyst 2023-6-24

If you have any more questions, then attach your image and code to read it in with the paperclip icon after you read this:

TUTORIAL: How to ask a question (on Answers) and get a fast answer

Do it in your own new question rather than here in @Nilushi Dissanayake's question. And "not working" is so vauge as to be unanswerable. Explain what that means, like give us ALL the red text.

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采纳的回答

Michelle Hirsch 2011-1-25

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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;
end

Best of luck! - scott

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Hasaan Ijaz 2020-9-12

Worked for me as well. Thank you!

Javaid Iqbal 2022-2-28

Thanks a lot

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更多回答（4 个）

Sebastian 2011-1-25

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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
end

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artprakasa 2017-3-13

yeaayy.. thanks, good idea.

Liu Sam 2018-3-4

Thank you! This is the exact answer I want!

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Walter Roberson 2011-1-25

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Please check the FAQ on this topic

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Nilushi Dissanayake 2011-1-25

thank you very much,,

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George 2016-9-24

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You can try ImageDatastore

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Walter Roberson 2017-9-11

To be slightly more accurate, the imageDatastore function needs R2016a or later, but the imageDatastore class was introduced in R2015b and objects could be created by calls to datastore.

Walter Roberson 2017-9-11

Before R2015a, the closest equivalent was the dataset array from the Statistics toolbox.

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DGM 2023-6-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/385-how-to-read-images-in-a-folder#answer_1261733

There are already many examples that I don't need to repeat, but I have my own ways of doing things. I'm only throwing this here because this is a defacto reference question.

https://www.mathworks.com/matlabcentral/answers/1915530-how-to-create-4d-array-of-images#answer_1176085

Pay particular note to the latter part of the answer.