I was trying to average 20 schlieren images. For that i wrote this code. But i am getting a white image as output image after averaging. Please help me with this. Thank you

numImages=20;
myFolder = 'D:\postprocessing\OR 3 NPR 3.5 flatplate _C001H001S0001';
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
filePattern = fullfile(myFolder, '*.tif');
tiffFiles = dir(filePattern);
for k = 1:length(tiffFiles(1:20))
  baseFileName = tiffFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  imageArray = imread(fullFileName)
  [m,n]=size(imageArray);
  out=zeros(m,n);
  for i = 1:m
      for j = 1:n
          out(i,j) = out(i,j) + imageArray(i,j);
          j = j+1;
      end
      i = i+1;
  end
  k = k+1;
end
out1 = out/20;
imshow(out1)

Answer 1

[KALYAN ACHARJYA]

numImages=20;
myFolder = 'D:\postprocessing\OR 3 NPR 3.5 flatplate _C001H001S0001';
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
filePattern = fullfile(myFolder, '*.tif');
tiffFiles = dir(filePattern);
result=0;
for k = 1:length(tiffFiles(1:20))
  baseFileName = tiffFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  imageArray = imread(fullFileName)
  im_add=result+imageArray;
end
out1 =im_add/20;
imshow(out1,[])

[DEBI SARANGI]

Thank you so much for the quick response. Now it is working fine.

[KALYAN ACHARJYA]

My pleasure!