Probleme de detection automatique

Bonjour,
Voici mon souci :
J'ai des images de ce type :
    et    
Ce que j'aimerais avoir c'est dans les deux cas : détecter automatiquement la position du centre, l'aire, et l'intensité moyenne dans chaque cercle.
Pour cela j'avais crée un programme qui, en utilisant le VI EdgeDetection, detectait le contour des cercles (ne marche pas bien sur la 2e image). Ensuite je divisait l'image en 4 sous-images de façon à séparer chaque cercle. A partir de la detection qu'il faisait d'un cercle, je pouvait determiner le "meilleur cercle" possible grâce au VI IMAQ Fit Cercle 2 qui me retournait la position des centres, les rayons des cercles, etc...
OUI MAIS VOILA : les 4 cercles sont censés être les mêmes, or dans les résultats de rayons des cercles qu'il me retourne (surtout sur la deuxième image) sont différents puisqu'il n'arrive pas correctement à faire le contour des cercles.
Ce qu'il me faudrait c'est détecter 1 cercle correctement (ou le tracer à la main ? mais je prefererais pas) transformer ce contour de cercle en masque et ensuite appliquer ce masque aux autres cercles. Ainsi, je veux obtenir la position du centre et l'intensité moyenne de chaque cercle mais en utilisant le même masque (avec le même rayon) pour tous les cercles.
Mais je n'ai aucune idée de comment faire ça, avez vous des idées  pour m'aider ???
Merci

J'ai le même problème!! il nous faudrait une solution car je me vois mal redemarrer mon iPhone 5 tous les matins le restant de mes jours, ce que je fais actuellement!!!
le problème concerne le reseau mais aussi le Wifi

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