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                <term xml:lang="fr">point matching</term>
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                <term xml:lang="fr">Pose estimation</term>
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              <p>On considère le problème de la localisation d'une caméra à partir d'un modèle non structuré obtenu par un algorithme de type structure from motion. Dans ce modèle, un point est représenté par ses coordonnées et un ensemble de descripteurs photométriques issus des images dans lesquelles il est observé. La localisation repose sur l'appariement de points d'intérêt de la vue courante avec des points du modèle, sur la base des descripteurs. Cependant le manque d'invariance des descripteurs aux changements de point de vue rend difficile la mise en correspondance dès que la vue courante est éloignée des images ayant servi à construire le modèle. Les techniques de simulation de point de vue, comme ASIFT, ont récemment montré leur intérêt pour la mise en correspondance entre images. Cet article explore l'apport de ces techniques pour enrichir le modèle initial par des descripteurs simulés et évalue le bénéfice respectif de simulations affines et homographiques. En particulier la simulation augmente la proportion de bons appariements et la précision du calcul de pose.</p>
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