function [I_1bis, I_2bis] = SEPARATION_1seuil(I_1,I_2,seuil) 
[M,N]  = size(I_1); T = sign(I_1-seuil*I_2); 
I_2bis = max(I_1.*T, zeros(M,N)); 
I_1bis = max(I_2.*(-T),zeros(M,N)); 
endfunction
