Below is the code snippet, where I am selecting images one by one, converting a image in 30*30 patch and calculating the standard deviation of patch and then storing that value in excel sheet. But the problem is only the standard deviation of last image is being saved to excel sheet others value are getting over ridden. How to avoid that?
Directory = 'With MA\';%Imgs = dir(fullfile(Directory,'*.jpg'));
Imgs = dir(Directory);nfiles = length(Imgs); % Number of files found
for z=1:nfiles thisname = Imgs(z).name; thisfile = fullfile(Directory, thisname); try Img = imread(thisfile); %Img = imread(fullfile(Directory,Imgs(z).name));
I=Img(:,:,2); imSz = size(I); patchSz = [30 30]; xIdxs = [1:patchSz(2):imSz(2) imSz(2)+1]; yIdxs = [1:patchSz(1):imSz(1) imSz(1)+1]; patches = cell(length(yIdxs)-1,length(xIdxs)-1);%for patches
stan = cell(length(yIdxs)-1,length(xIdxs)-1);%for standard deviation
for i = 1:length(yIdxs)-1 Isub = I(yIdxs(i):yIdxs(i+1)-1,:); for j = 1:length(xIdxs)-1 patches{i,j} = Isub(:,xIdxs(j):xIdxs(j+1)-1);%saving patches
stan{i,j} = std2(patches{i,j});%saving standard deviation
end end catch end xlswrite('output.xlsx', stan); end
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