function affichage_image(im,cx21g,cy21g,dec,nbpoints)

figure(1)
imagesc(im)
colormap(gray)
hold on
plot(cx21g,cy21g,'b+')
axis image
for ii=1:nbpoints
text(cx21g(ii,1)+dec,cy21g(ii,1),num2str(ii,'%02d'),'Color',[0 0 1],'FontSize',14,'LineWidth',2)
end