MATLAB: How can read multiple images from different subfolders

digital image processingimageImage Acquisition Toolboximage processingImage Processing Toolboximage segmentationmatrix manipulation

I have folder name data and under this folder 30 folders (named A1 to A30) and each one have many colored images RGB (each image sized to 150*150 pixels) around 8000 images. I would like to read those images and save them to one matrix which has size 150*150*3*8000 (4d matrix). I tried many code but could not come up with an efficient code. So, could someone please suggest me an idea or code at least how to read those images from different folders and save them.

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See attached code.

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MATLAB: How to read image data sets from a folder at once

OutputFolder = 'C:\Temp';  % Set as needed [EDITED]
dinfo = dir('*.jpg');% image extension
for K = 1 : length(dinfo)
  thisimage = dinfo(K).name;
  Img   = imread(thisimage);
  Y     = imshow(Img);
  Gray  = rgb2gray(Img);
  GrayS = imresize(Gray, [112, 92], 'bilinear');
  imwrite(GrayS, fullfile(OutputFolder, thisimage));  % [EDITED]
end

Or any other method for the resizing, see: doc imresize.

[EDITED] See the changed code for writing the changed file. Perhaps you want to modify the file name. Then you can split the file extension and the name by fileparts.

MATLAB: Subscripted assignment dimension mismatch.

.jpg files are almost always RGB files, even if they look gray. Code that is expecting grayscale images will often fail on RGB files.

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Related Solutions

MATLAB: How to read image data sets from a folder at once

MATLAB: Subscripted assignment dimension mismatch.

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