Characterization of corners of curvilinear segment

G - Physics – 06 – T

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G06T 17/40 (2006.01) G06K 9/46 (2006.01)

Patent

CA 2237235

A system determines discontinuities on a drawn curve. Local tangent values for a curvilinear segment are generated by determining the most likely tangent value for all points on the segment and by acting on a sampling of points around the current point whose tangent is to be determined. A robust statistical estimator is then applied to all angle values generated for the sample set to determine the likely intended tangent direction of the current focal point. The system then selects points with significant changes in tangent values to determine curve discontinuities such that the corners of the segment can be derived.

Système déterminant des discontinuités dans une courbe tracée. Les valeurs de tangente locales pour un segment curviligne sont produites en déterminant la valeur de tangente la plus probable pour tous les points sur le segment, et en traitant un échantillonnage de points autour du point courant dont la tangente doit être déterminée. Un estimateur statistique robuste est alors appliqué à toutes les valeurs d'angle produites pour l'ensemble d'échantillons, afin d'établir la direction probable de tangente prévue du point d'intérêt courant. Le système choisit ensuite des points présentant des changements considérables de valeurs de tangente, afin de déterminer les discontinuités de courbe pour que les coins du segment soient dérivés.

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