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How can I convert multiple images (all the same size) into one matrix?

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Lauren Pitts
Lauren Pitts on 31 Jul 2019
Commented: Lauren Pitts on 1 Aug 2019
I have a folder of 100 images all 32x32. When I use M = imread(0001.png) a matrix populates but that's only for that one image in the folder. I need help to create a matrix with all of the images. This is the first step for me to be able to create a dataset for my neural network training. Thanks in advance!
M = imread(0001.png)

Accepted Answer

awezmm on 31 Jul 2019
You can create a cell array that holds all the image matrices. Use a for loop to imread each image and then store it in a cell array, in each iteration:
%cell array of your image filepaths
allFilenames = {"0001.png", "0002.png", "0003.png"};
%empty cell that will store all the images
allImages = cell(length(allFilenames),1);
%for loop to imread each image from the the allFilenames cell array and store it in allImages cell array
for i = 1:length(allFilenames);
allImages{i} = imread(allFilenames{i});
  1 Comment
Akira Agata
Akira Agata on 1 Aug 2019
Hi awezmm-san,
To get all the *.png file path, I would recommend using dir function, rather than writing them manually.

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More Answers (1)

Akira Agata
Akira Agata on 1 Aug 2019
To create image dataset for training a neural network, imageDatastore should be an easy and promissing way. So I would recommend trying this function!
  1 Comment
Lauren Pitts
Lauren Pitts on 1 Aug 2019
Thank you, Akira. When I use this I get a error saying it "can't find the folder location. How can I direct the fullfile to my Matlab folder on my desktop? When I inserted the C:// path I get an error.
imds = imageDatastore(fullfile(Matlab,'test'),...
Annotation 2019-08-01 105248.png

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