Method for determining a contour data set of spectacle frame...

G - Physics – 02 – C

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G02C 13/00 (2006.01) B24B 9/14 (2006.01)

Patent

CA 2710587

A method for determining a contour data set of a spectacle frame rim comprising the steps of : a) providing a plurality (N) of three dimensional measured points along a contour of a spectacle frame rim; b) calculating a plurality of best torus that fits P points chosen among the N measured points and where P is equal or more than 4; c) selecting the (T) points among the N measured points that deviate from one of the best torus more than a threshold value; d) forming the contour data set with (N-T) three dimensional measured points where the T selected points of step c) are excluded from the list of three dimensional measured points of step a).

L'invention concerne un procédé permettant de déterminer un ensemble de données de contour d'une monture de lunettes, qui consiste: a) à fournir une pluralité de (N) points mesurés tridimensionnels le long d'un contour d'une monture de lunettes; b) à calculer une pluralité du meilleur tore susceptible de s'adapter à des points P choisis parmi N points mesurés, P étant égal ou supérieur à 4; c) à sélectionner les points (T) parmi les N points mesurés qui dévient d'un des meilleurs tores de plus d'une valeur seuil; d) à former l'ensemble de données de contour avec (N-T) points mesurés tridimensionnels où les points T choisis en c) sont exclus de la liste des points mesurés tridimensionnels de a).

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