function [z] = fast_marching(M_voisins, M_d_z, nb_lignes, nb_colonnes)

    z = -ones(nb_lignes, nb_colonnes);

    z(1,:) = 0;
    z(end, :) = 0;
    z(:, 1) = 0;
    z(:, end) = 0;

    M_voisins

end