# How can i take multiple images from a folder (which is almost 800!) and perform specific operation?

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rakib mostafiz 2021 年 7 月 13 日
I know how to calculate entropy of a single image channels. But I want to calculate entropy for each images from a dataset, so that the output shows "what percent of images" are in some specific entropy range.
my entropy code: (I'm using MATLAB 2015b)
I= im;
Red = I(:,:,1);
Green = I(:,:,2);
Blue = I(:,:,3);
%I = I(:); % Vectorization of RGB values
p = imhist(Red); % Histogram
p(p == 0) = [ ];% remove zero entries in p
p = p ./ numel(I); % normalize p so that sum(p) is one.
Er = round(-sum(p.*log2(p)),3);
p = imhist(Blue); % Histogram
p(p == 0) = [ ];% remove zero entries in p
p = p ./ numel(I); % normalize p so that sum(p) is one.
Eb = round(-sum(p.*log2(p)),3);
figure(1),imshow(im),title(['Entropy for R channel = ', num2str(Er),', Entropy for B channel = ', num2str(Eb)]);

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### 回答 (1 件)

Sulaymon Eshkabilov 2021 年 7 月 13 日
You'd need to employ for or while loop with the following loop structure:
M_FOLDER = '???\MATLAB'; % Directory where all image files are residing
F_Pattern = fullfile(M_Folder, '*.png'); % OR F_Pattern = fullfile(myFolder, '*.jpeg'); or *.tiff
FILES = dir(F_Pattern);
F_names = {FILES.name};
for jj = 1 : length(F_names)
BFileName = FILES(jj).name;
F_FileName = fullfile(FILES(jj).folder, BFileName);
...
end
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Sulaymon Eshkabilov 2021 年 7 月 21 日
Or change the current directory to M_Folder containg all image files, e.g.:
cd C:\Users\????

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R2015b

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