Double loop over images

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george korris
george korris on 28 Apr 2021
Commented: george korris on 10 May 2021
Hi guys! So i have this question: is there a way to double loop a lot of images?
What i mean is that i know how to loop over a lot of images (of the same type for example .png) lets say i have the next 10 images with names: c1=10.2 , c2=10.2 up to c10=10.2 with the next lines of code i can read them all and do what i want next with them
for n=1:10
images{n} = imread(sprintf('c%d=10.2.png',n));
%code ....
end
but if i lets say want to loop over this for loop and have lets say a code that for the numbers 10 30 50 70 and 100 reads firstly the images with names c1=10.2 up to c10=10.2 and then does the previous for loop and when that for loop is done does the same thing for the c1=30.2 up to c10=30.2 and then for 50 and then 70 and then finally for 100 c1=100.2 up to c10=100.2 .
so it will read
c1=10.2 .... c10=10.2 and then read all the images c1=30.2 up to c10=30.2 and then c1=50.2 up to c10=50.2 and then c1=70.2 ... c10=70.2 and finally c1=100.2 .... c10=100.2
I hope i expained it well !
  5 Comments
Jan
Jan on 28 Apr 2021
Just try it:
for m=10:20:70
for n=1:10
sprintf('c%d=%d.2.png',n,m)
end
end
george korris
george korris on 28 Apr 2021
yeah you are write Jan thank you guys you are awesome!!! So there is no way for it to read the pics up to 100 since they are not +20 from 70 ?? i can only read 10 30 50 and 70 write? not 100 also?

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Accepted Answer

Image Analyst
Image Analyst on 28 Apr 2021
Try this:
folder = pwd;
% Now we have a list of all the filenames.
% Now how another loop that reads in one image with names like 10, 30, 50, ...
% and an inner loop that does 1-10.
outLoopValues = [10, 30, 50, 70, 100] % Whatever values you want.
for k = 1 : length(outLoopValues)
index = outLoopValues(k);
for n = 1 : 10
thisBaseFileName = sprintf('c%d=%d.2.png', n, index);
thisFileName = fullfile(folder, thisBaseFileName);
if isfile(thisFileName)
fprintf('Processing "%s"\n', thisFileName);
% Code to call imread and process this image ...
else
% File doesn't exist.
fprintf(' !!!! Skipping non-existent file: "%s"\n', thisFileName);
continue;
end
end
fprintf('\n'); % Print blank line between groups.
end
fprintf('Done running %s.m\n', mfilename);
  3 Comments
george korris
george korris on 28 Apr 2021
Thank you very much Image Analyst!
george korris
george korris on 10 May 2021
sorry to bother you again but how can i add the images that i read inside the double loop?
i tried
K = imadd(img_rot{n,index},'uint16');
but it didn't work

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