input_image = rgb2gray(imread("cotillard.jpg"));

imageWidth = size(input_image) (1)
imageLenght = size(input_image) (2)

e = [];
image = [];
e(1) = input_image(1)(1)
counter = 1;

%%%%% KODOWANIE %%%%%%%%

for i = 1 : imageWidth
  for j = 1 : imageLenght
    image(counter) = input_image(i,j);
    counter++;
    endfor
endfor

for x = 1 : size(image)(2)
  if (x == 1)
    e(x) = image(1);
  else
    e(x) = image(x) - image(x-1);
  endif
endfor

%%%%%% DEKODOWANIE %%%%%%%

g = [];
out_image = uint8([]);

for x = 1 : size(image)(2)
  if (x == 1)
    g(x) = e(1);
  else
    g(x) = e(x) + g(x-1);
  endif
endfor

counter = 1;

for i = 1 : imageWidth
  for j = 1 : imageLenght
    out_image(i,j) = uint8(g(counter));
    counter++;
    endfor
endfor



figure
subplot(1,2,1)
imshow(input_image)
title ('Obraz wejsciowy');
subplot(1,2,2)
imshow(out_image)
title ('Obraz wyjsciowy');