save CIFAR-100 images

Question

Abo 2017-3-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/329597-save-cifar-100-images

评论： Komal B 2019-11-8

dear all, I'm working with CIFAR-100 images for training CNN, available here: https://www.cs.toronto.edu/~kriz/cifar-10-matlab.tar.gz

as im extracting the file, would see different mat files (each contain one called 'labels' another 'data'). any body know what is labels and data? how can i do the same for my own data? I meant save my images as mat file with data and labels? thanks

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Answer 1

Antonio Cedillo Hernandez 2018-5-5

6
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https://ww2.mathworks.cn/matlabcentral/answers/329597-save-cifar-100-images#answer_318856

编辑：Antonio Cedillo Hernandez 2018-5-5

在 MATLAB Online 中打开

Hi Abo! I apologize if my answer is too late, but as there is 21 views of this question in last 30 days, so I will post my answer to your question. There are three MAT files called meta.dat, test.mat and train.mat. All of them are matrices with data in order to guide the correct extracting process of the images. Here is my code to extract the images from the dataset:

if true
  clc;
  clear all;
  load('meta.mat');
  %Create folders
  for i=1:length(fine_label_names)
     mkdir('CIFAR-100\TEST\',fine_label_names{i});
     mkdir('CIFAR-100\TRAIN\',fine_label_names{i});
  end
  %%Training images
  load('train.mat');
  im=zeros(32,32,3);
  for cpt=1:50000   
     R=data(cpt,1:1024);
     G=data(cpt,1025:2048);
     B=data(cpt,2049:3072);
     k=1;
     for x=1:32
        for i=1:32
          im(x,i,1)=R(k);
          im(x,i,2)=G(k);
          im(x,i,3)=B(k);
          k=k+1;
        end
     end  
     im=uint8(im);
     pathdest = strcat('CIFAR-100\TRAIN\',fine_label_names{fine_labels(cpt)+1},'\',filenames{cpt});
     imwrite(im,pathdest,'png'); 
 end
 %%Test images
 load('test.mat');
 im=zeros(32,32,3);
 for cpt=1:10000   
    R=data(cpt,1:1024);
    G=data(cpt,1025:2048);
    B=data(cpt,2049:3072);
    k=1;
    for x=1:32
       for i=1:32
          im(x,i,1)=R(k);
          im(x,i,2)=G(k);
          im(x,i,3)=B(k);
          k=k+1;
       end
    end  
    im=uint8(im);
    pathdest = strcat('CIFAR-100\TEST\',fine_label_names{fine_labels(cpt)+1},'\',filenames{cpt});
    imwrite(im,pathdest,'png'); 
  end
end