## Author: Laurent <laurent@pop-os>
## Created: 2020-11-02

function [X,Y] = vectorisation(I)

  I_g = I(:, 1:end-1);
  I_d = I(:, 2:end  );
  
  X = reshape(I_g,[],1);
  Y = reshape(I_d,[],1);
  
endfunction