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les douze masques sont obtenus par rotation des trois masques illustrés ci-dessous autour du pixel central marqué p( p=point courant, c=point de contour, x=point du fond ou de la masse interne) : xcx xcx xcx cpc xpc xpx xxx cxx cxc a chaque itération, les pixels traités sont ceux dont le degré d'intériorité est égal à l'ordre de l'itération courante ainsi que ceux, de degrés inférieurs, qui ont été conservés lors des étapes précédentes.
the twelve masks are obtained by rotating the three masks illustrated below about the central pixel marked p(p=current point, c=contour point, x=point on the background or the internal mass): xcx xcx xcx cpc xpc xpx xxx cxx cxc at each iteration, the processed pixels are those whose degree of interiority is equal to the order of the current iteration as well as those, with lower degrees, which were kept during the previous steps.