function Bleu=FiltreBleu(img)
[m,n,t]=size(img);
Bleu=zeros(m,n,t);
for i=1:m
    for j=1:n
        if(img(i,j,3)>70&&img(i,j,2)<60&&img(i,j,1)<60)
            Bleu(i,j,3)=1;
        end
    end
end