Creation of a linear or planar shape

G - Physics – 06 – T

Patent

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Details

G06T 1/00 (2006.01)

Patent

CA 2662411

The invention relates to a method for embossing a watermark into a model of a linear or planar shape, especially a non-uniform rational B-splines (NURBS) model. Said model comprises a plurality of splines, the combination of which forms the shape. Control points (P) are assigned to the splines such that a course of the respectively associated spline can be modified and thus be controlled by changing the position of the control points (P) and/or weights of the control points. Furthermore, nodes which are located in a section of the shape that is formed by the respectively associated spline are allocated to the splines. In order to change the shape (the modified curve runs through point Cmod) when a watermark is embossed into the model, the position of at least one control point is modified, the weight by which a control point affects the shape and thus influences at least one area of the shape is modified, and/or an additional control point is inserted into the model. At least one additional node is inserted into the model (new node at u = 1.1875 on the modified curve) in order to obtain information on how the change of the shape can be reversed.

L'invention concerne un procédé d'incrustation de filigranes dans un modèle de forme linéaire ou surfacique, notamment dans un modèle NURBS (spline NURBS). Le modèle présente une pluralité de splines formant ensemble une forme, des points de contrôle (P) étant affectés aux splines de telle manière que par modification de la position des points de contrôle (P) et/ou pondération des points de contrôle, une allure des splines respectivement affectées peut être modifiée et ainsi contrôlée. Des noeuds sont également affectés aux splines, ces noeuds étant situés sur une partie de la forme, formée par la spline respectivement affectée. Lors de l'incrustation du filigrane dans le modèle, la forme est modifiée (la courbe modifiée contient le point Cmod) par : modification de la position d'au moins un point de contrôle; modification d'au moins un facteur avec lequel un point de contrôle influe sur la forme et commande au moins une zone de la forme; et/ou insertion d'un point de contrôle supplémentaire dans le modèle. Une information concernant la manière par laquelle la modification de la forme peut être annulée est appliquée par insertion d'au moins un noeud supplémentaire dans le modèle (nouveau noeud pour u = 1,1875 sur la courbe modifiée).

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