how to access images from sub folders?

Question

sidra Rafique 2018-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/419002-how-to-access-images-from-sub-folders

编辑： Stephen23 2018-10-1

hi. i have a folder F1 and then in this folder i have S1 and S2 afterwards in each S1 and S2 i have E1 and E2 finally in these folders i have images named as frame_0000.jpeg till frame_2000.jpeg. for better understanding i am attaching a pic of my hierarchy.

after accessing each image i have to convert them from rgb2gray, apply my required preprocessing and then make excel file of each images in 'E' folders. Please help me accessing these images. waiting for your kind response.

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Answer 1

Stephen23 2018-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/419002-how-to-access-images-from-sub-folders#answer_339057

编辑：Stephen23 2018-9-29

在 MATLAB Online 中打开

Using dir:

D = 'path to directory F1';
S = dir(fullfile(D,'S*'));
for ii = 1:numel(S)
    E = dir(fullfile(D,S(ii).name,'E*'));
    for jj = 1:numel(E)
        F = dir(fullfile(D,S(ii).name,E(jj).name,'frame*.jpg'));
        for kk = 1:numel(F)
            N = fullfile(D,S(ii).name,E(jj).name,F(kk).name);
            im = imread(N);
        end
    end
end

Using cell arrays and sprintf:

F = 'path to directory F1';
S = {'S1','S2'};
E = {'E1','E2'};
V = 0:2000;
for ii = 1:numel(S)
    for jj = 1:numel(E)
        for kk = 1:numel(F)
            N = fullfile(D,S{ii},E{jj},sprintf('frame_%04d.jpg',V(kk)));
            im = imread(N);
        end
    end
end

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sidra Rafique 2018-9-30

yes. i mean workbook and worksheets. you are right.

Stephen23 2018-10-1

编辑：Stephen23 2018-10-1

@sidra Rafique: it seems that you want to use the S loop to define the filename, and the E loop to define the sheet name, something like this:

D = 'path to directory F1';
S = dir(fullfile(D,'S*'));
for ii = 1:numel(S)
    fnm = sprintf('%s.xlsx',matrix,S(ii).name);
    E = dir(fullfile(D,S(ii).name,'E*'));
    for jj = 1:numel(E)
        sht = E(jj).name;
        F = dir(fullfile(D,S(ii).name,E(jj).name,'frame*.jpg'));
        out = cell(1,numel(F))
        for kk = 1:numel(F)
            N = fullfile(D,S{ii},E{jj},sprintf('frame_%04d.jpg',V(kk)));
            im = imread(N);
            out{kk} = ... whatever data you want to save
        end
        mat = vertcat(out{:});
        xlswrite(fnm,mat,sht,...)
    end
end

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Answer 2

KSSV 2018-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/419002-how-to-access-images-from-sub-folders#answer_336808

A simple google will give you lot of links to this question. This question is discussed and asked lot many times.

https://in.mathworks.com/matlabcentral/answers/401204-how-do-i-read-folders-with-subfolders

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sidra Rafique 2018-9-28

编辑：sidra Rafique 2018-9-28

在 MATLAB Online 中打开

but i want to access these images using switch-case statements. i have tried to access directory using switch-case but i dont know where i am wrong. i am constantly getting wrong+infinite loop output.

if true
fCount=0;sCount=0;eCount=0;
while(fCount==0)    
  switch(sCount)
      case 0
          Directoryofsub = 'E:\f1\sub1';             
          switch(eCount)
              case 0
                  Imgs = sprintf('E:/f1/s1/e1/');
                  eCount=1;    
              case 1
                  Imgs = sprintf('E:/f1/s1/e2/');
                  eCount=2;
          end
         sCount=1;
      case 1
          Directoryofsub = 'E:\f1\s2';
           switch(eCount)
               case 0
                   Imgs = sprintf('E:/f1/s2/e1/');
                   eCount=1;                    
               case 1
                   Imgs = sprintf('E:/f1/s2/e2/');
                   eCount=2;
           end
      otherwise
               fCount=1;
               sCount=2;
               fprintf('Thank you for using me');
  end
end
end

this code is only accessing e1 of case 0 and e2 of case 1 and then keep on repeating e2 of case 1 infinite times. please guide me where is the error. waiting for your response.

sidra Rafique 2018-9-29

By using KSSV's approach i can get count of the images and that count cannot be used as argument in 'imread' command.(i am hoping you have read KSSV's prescribed code). i have to read each image using 'imread' and later i have to make a excel sheet of name of the each folder and files and their corresponding values. but if you have any other suggestion then please do share it with me or make changes in my switch statements. So that i can work further as i am stuck in this for last 4 weeks. thankyou