how can i read/train all images from subfolders

Question

mark 2015-1-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/169691-how-can-i-read-train-all-images-from-subfolders

评论： Image Analyst 2017-4-13

hello can you help me to modified my code? so i have 3 subfolder in database folder and every subfolder there is 5 pictures on it and i want to read all images in all subfolders and train it.

this is my code that i use in training all images from database folder:

 clc;
    dn='.\database\';
     db=dir(strcat(dn,'*.jpg'));
    k=1;
    %length(db)
    p=1;
 for(i=1:1:length(db))
     fname=db(i).name;
     fname=strcat(dn,fname);
     im=imread(fname);
     axes(handles.axes1);
     imshow(im);
     im=rgb2gray(im);
     im=imresize(im,[256 256]);
     X=double(im);
     k=k+1;
     f=lbp_sir(X);
     plot(f);
     Features(:,p)=f;
     TrnFile(p).name=fname;
     p=p+1;
 end;
 save features Features TrnFile

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Answer 1

Image Analyst 2015-1-12

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https://ww2.mathworks.cn/matlabcentral/answers/169691-how-can-i-read-train-all-images-from-subfolders#answer_164686

recurse_subfolders.m

See my attached demo that will recurse into all subfolders and get image file names. Then process them in whatever way you want.

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mark 2015-1-12

在 MATLAB Online 中打开

sir i tried this one. the problem is it will train only the last image in last subfolder.

 topLevelFolder = '.\DATABASE\';
 if topLevelFolder == 0
  return;
 end
 % Get list of all subfolders.
 allSubFolders = genpath(topLevelFolder);
 % Parse into a cell array.
remain = allSubFolders;
 listOfFolderNames = {};
 while true
  [singleSubFolder, remain] = strtok(remain, ';');
  if isempty(singleSubFolder)
    break;
  end
  listOfFolderNames = [listOfFolderNames singleSubFolder];
 end
 numberOfFolders = length(listOfFolderNames)
 % Process all image files in those folders.
 for k = 1 : numberOfFolders
  % Get this folder and print it out.
  thisFolder = listOfFolderNames{k};
  fprintf('Processing folder %s\n', thisFolder);
  
  % Get PNG files.
  filePattern = sprintf('%s/*.png', thisFolder);
  baseFileNames = dir(filePattern);
  % Add on TIF files.
  filePattern = sprintf('%s/*.tif', thisFolder);
  baseFileNames = [baseFileNames; dir(filePattern)];
  % Add on JPG files.
  filePattern = sprintf('%s/*.jpg', thisFolder);
  baseFileNames = [baseFileNames; dir(filePattern)];
  numberOfImageFiles = length(baseFileNames);
  % Now we have a list of all files in this folder.
  
  if numberOfImageFiles >= 1
    % Go through all those image files.
    for f = 1 : numberOfImageFiles
      fullFileName = fullfile(thisFolder, baseFileNames(f).name);
      fprintf('     Processing image file %s\n', fullFileName);
    end
  else
    fprintf('     Folder %s has no image files in it.\n', thisFolder);
  end
end
    k=1;
    %length(db)
    p=1;
     im=imread(fullFileName);
     axes(handles.axes1);
     imshow(im);
     im=rgb2gray(im);
     im=imresize(im,[256 256]);
     X=double(im);
     k=k+1;
     f=lbp_sir(X);
     plot(f);
     Features(:,p)=f;
     TrnFile(p).name=fullFileName;
     p=p+1;
 save features Features TrnFile

mark 2015-1-12

在 MATLAB Online 中打开

sorry for my mistake i tried to put the algorithm in the loop. but i got same result.

clc;

 % Ask user to confirm or change.
 topLevelFolder ='.\database\';
 if topLevelFolder == 0
  return;
end
% Get list of all subfolders.
allSubFolders = genpath(topLevelFolder);
% Parse into a cell array.
remain = allSubFolders;
listOfFolderNames = {};
while true
  [singleSubFolder, remain] = strtok(remain, ';');
  if isempty(singleSubFolder)
    break;
  end
  listOfFolderNames = [listOfFolderNames singleSubFolder];
end
numberOfFolders = length(listOfFolderNames)
% Process all image files in those folders.
for k = 1 : numberOfFolders
  % Get this folder and print it out.
  thisFolder = listOfFolderNames{k};
  fprintf('Processing folder %s\n', thisFolder);
  
  % Get PNG files.
  filePattern = sprintf('%s/*.png', thisFolder);
  baseFileNames = dir(filePattern);
  % Add on TIF files.
  filePattern = sprintf('%s/*.bmp', thisFolder);
  baseFileNames = [baseFileNames; dir(filePattern)];
  % Add on JPG files.
  filePattern = sprintf('%s/*.jpg', thisFolder);
  baseFileNames = [baseFileNames; dir(filePattern)];
  numberOfImageFiles = length(baseFileNames);
  % Now we have a list of all files in this folder.
  
  if numberOfImageFiles >= 1
    % Go through all those image files.
    for f = 1 : numberOfImageFiles
      fullFileName = fullfile(thisFolder, baseFileNames(f).name);
      fprintf('     Processing image file %s\n', fullFileName);   
     k=1;
 p=1;
     im=imread(fullFileName);
     axes(handles.axes1);
     imshow(im);
     im=rgb2gray(im);
     im=imresize(im,[256 256]);
     X=double(im);
     k=k+1;
     f=lbp_sir(X);
     plot(f);
     Features(:,p)=f;
     TrnFile(p).name=fullFileName;
     p=p+1;
            save features Features TrnFile     
        end;

else fprintf(' Folder %s has no image files in it.\n', thisFolder); end end

mark 2015-1-12

在 MATLAB Online 中打开

by using this code now. i can now get train the all the images in last subfolder pls check it for the last time. clc;

 % Ask user to confirm or change.
topLevelFolder ='.\database\';
if topLevelFolder == 0
  return;
end
% Get list of all subfolders.
allSubFolders = genpath(topLevelFolder);
% Parse into a cell array.
remain = allSubFolders;
listOfFolderNames = {};
while true
  [singleSubFolder, remain] = strtok(remain, ';');
  if isempty(singleSubFolder)
    break;
  end
  listOfFolderNames = [listOfFolderNames singleSubFolder];
end
numberOfFolders = length(listOfFolderNames)
 % Process all image files in those folders.
for k = 1 : numberOfFolders
  % Get this folder and print it out.
  thisFolder = listOfFolderNames{k};
  fprintf('Processing folder %s\n', thisFolder);
  
  % Get PNG files.
  filePattern = sprintf('%s/*.png', thisFolder);
  baseFileNames = dir(filePattern);
  % Add on TIF files.
  filePattern = sprintf('%s/*.bmp', thisFolder);
  baseFileNames = [baseFileNames; dir(filePattern)];
  % Add on JPG files.
  filePattern = sprintf('%s/*.jpg', thisFolder);
  baseFileNames = [baseFileNames; dir(filePattern)];
  numberOfImageFiles = length(baseFileNames);
  % Now we have a list of all files in this folder.
   k=1;
 p=1;
  if numberOfImageFiles >= 1
    % Go through all those image files.
    for f = 1:numberOfImageFiles
      fullFileName = fullfile(thisFolder, baseFileNames(f).name);
      fprintf('     Processing image file %s\n', fullFileName);   
     im=imread(fullFileName);
     axes(handles.axes1);
     imshow(im);
     im=rgb2gray(im);
     im=imresize(im,[256 256]);
     X=double(im);
     k=k+1;
     f=lbp_sir(X);
     plot(f);
     Features(:,p)=f;
     TrnFile(p).name=fullFileName;
     p=p+1;
        end;
        save features Features TrnFile

else fprintf(' Folder %s has no image files in it.\n', thisFolder); end end

Jyothi Alugolu 2017-4-13

while running your code,the files were not loading in order,if there are 100 images of each 8 samples..then from 1_1,1_2..,1_8....2_1,2_2...2_8...100_1,..100_8 must be loaded....instead of that by your code images were loading starting from 100_1,100_2...next 10_1,10_2...last 9_1..9_8 were loading..there is solution by using natsortfiles function..but i am not knowing where i have to call natsortfile function..please tell me.

Image Analyst 2017-4-13

在 MATLAB Online 中打开

I imagine you'd put the call to replace this line:

baseFileNames = dir(filePattern);

which is the line that gets all the filenames in the folder you're looking in at the moment. But actually, it looks like Stephen's function goes into subdirectories, so maybe all you need it his function, not mine.

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Answer 2

Dima Lisin 2015-1-12

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If you have a recent version of MATLAB with the Computer Vision System Toolbox, then you can use imageSet.

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mark 2015-1-12

thankyou so much for your response. can you help me to modified my code ?:(

Dima Lisin 2015-1-13

编辑：Dima Lisin 2015-1-13

在 MATLAB Online 中打开

imgSets = imageSet('.\database\', 'recursive');

will return an array of imageSet objects.

imgSets(1).Description

will contain the name of the first subfolder.

imshow(read(imgSets(2), 2));

will display the second image in the second folder. Please see the documentation of imageSet for more details.

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Answer 3

Priyabrata Karmakar 2016-2-3

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在 MATLAB Online 中打开

You can use the following code. Cut and paste the whole code from below, insert the path of your main database folder in 'Database Path' section. sourceFiles consists of the paths of individual images which you can read using imread function.[imread(sourceFiles(i).name]. labels which is needed during classification will give you the corresponding labels of individuals images in sourceFiles.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

imgSets = imageSet('Database Path', 'recursive'); m=1;sourceFiles=[];labels=[]; for i=1:length(imgSets) srcFiles=dir(strcat('Database Path\',imgSets(i).Description,'\*.jpg'));

    for j=1:length(srcFiles)
        srcFiles(j).name = strcat('Database Path\',imgSets(i).Description,'\',srcFiles(j).name);
    end
    l=length(srcFiles);
    label=m*ones(l,1);
    sourceFiles=[sourceFiles;srcFiles];
    labels=[labels;label]; 
    m=m+1;
end

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Answer 4

aras masood 2017-1-28

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hello every on please anyone tell me i have a database for hand recognition i want replace this database to a folder which is consists of a set of images i want use them to train and recognize faces by this folder could anyone tell me how to do such things please ?

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Walter Roberson 2017-1-28

We need further information about what is stored in the database and how the program accesses the data. For example the database might contain the weights of a trained neural network that has already been trained on extracted features and so it might be necessary to do a bunch of computing on your custom images. We do not know, as you do not give enough information.

But instead of replying here you should open a new Question for this and give the details there and then delete this post.

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how can i read/train all images from subfolders

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