Saving Image Dataset in Array

Trevor Badji

2019 3 6

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I have number of 17327 jpg files in my dataset. I need to save them in an array with dimensions [number of images, 224,224,3] . All images are 224x224. When try code below, it gives array that 'imageArray' with 224x1087968x3

myFolder = 'C:\Users\karab\Desktop\BİTİRME\validation';
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
filePattern = fullfile(myFolder, '*.jpg');
jpegFiles = dir(filePattern);
imageArray=[]
for k = 1:length(jpegFiles)
  baseFileName = jpegFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  imageArray = [imageArray imread(fullFileName)];
  %imshow(imageArray);  % Display image.
  drawnow; % Force display to update immediately.
end

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Adam 2019-3-6

在 MATLAB Online 中打开

Pre-allocate imageArray to be the correct size and assign the new image by indexing rather than concatenation. You know what size it needs to be upfront so just create it, e.g.

imageArray = zeros( numel( jpegFiles ), 224, 224, 3 );

Although if you can get the 224 from somewhere rather than hard-code it then that would be better too.

Then:

imageArray( k, :, :, : ) = imread( fullFileName );

in your loop should work, assuming your images are true RGB and not inidexed greyscale images.

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