Batch processing images for downsampling
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Hi,
I would like to perform downsampling for like over 700 images. It is pretty time-consuming to do it one by one. How can I achieve it at one time?
Thanks a lot.
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Accepted Answer
Mathieu NOE
on 13 Jun 2023
hello
see example below - adapt to your own needs
%% Initalize the data
dataDir= fullfile(pwd); % select appropriate directory
exts = {'.jpg','.png','.tif'}; % choose valid file extensions like {'.jpg', '.png'}
resize_size = 100; % pixels size for output img
imds = imageDatastore(fullfile(dataDir),...
'IncludeSubfolders',true,'FileExtensions',exts,'LabelSource','foldernames');
countEachLabel(imds);
numImages = numel(imds.Files);
for i = 1:numImages
img = readimage(imds, i);
[m,n,p] = size(img);
% compute scale factor (same on both dimensions)
scale_factor = min(resize_size/m,resize_size/n);
img3= imresize(img, scale_factor);
figure(i),
img4= imshow(img3, 'InitialMagnification', 800);
drawnow;
Train{i} = (img3); %output image stored in cell
end
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