how to access images from sub folders?

10 views (last 30 days)
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.

Accepted Answer

Stephen23
Stephen23 on 29 Sep 2018
Edited: Stephen23 on 29 Sep 2018
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
See also:
  10 Comments
sidra Rafique
sidra Rafique on 30 Sep 2018
yes. i mean workbook and worksheets. you are right.
Stephen23
Stephen23 on 1 Oct 2018
Edited: Stephen23 on 1 Oct 2018

@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

Sign in to comment.

More Answers (1)

KSSV
KSSV on 14 Sep 2018
A simple google will give you lot of links to this question. This question is discussed and asked lot many times.
  4 Comments
sidra Rafique
sidra Rafique on 29 Sep 2018
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
Image Analyst
Image Analyst on 30 Sep 2018
Looks like this doesn't apply anymore since you accepted the other answer.

Sign in to comment.

Categories

Find more on File Operations in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!