How to read images in a folder

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Nilushi Dissanayake
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
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
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
Michelle Hirsch 2011-1-25
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
Hasaan Ijaz 2020-9-12
Worked for me as well. Thank you!

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更多回答（4 个）

Sebastian
Sebastian 2011-1-25
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
artprakasa 2017-3-13
yeaayy.. thanks, good idea.
Liu Sam
Liu Sam 2018-3-4
Thank you! This is the exact answer I want!

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Walter Roberson
Walter Roberson 2011-1-25
Please check the FAQ on this topic
George
George 2016-9-24
You can try ImageDatastore
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Walter Roberson
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
Walter Roberson 2017-9-11
Before R2015a, the closest equivalent was the dataset array from the Statistics toolbox.

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DGM
DGM 2023-6-24
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.

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