Method of stroke segmentation for handwritten input

G - Physics – 06 – K

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G06K 9/50 (2006.01) G06K 9/22 (2006.01)

Patent

CA 2162489

The method of the present invention includes a step of calculating the derivative (140), or instantaneous rate of change, of the curvature at points in the handwritten input (110). The method then selects as stroke boundary points certain points (or pixels) in the input which lie at a midpoint between a point of high curvature derivative and a succeeding point of low curvature derivative (150). Such boundary points are not influenced by absolute curvature values, but rather only by relative changes in the curvature. The stroke segmentation boundary points are provided to a stroke-based recognizer for interpretation of the handwritten input (170).

Le procédé de l'invention comprend une étape de calcul de la dérivée (140), ou vitesse instantanée de changement, de la courbure au niveau de points dans l'entrée manuscrite (110). Le procédé sélectionne ensuite à titre de points limites de trait certains points (ou pixels) dans l'entrée, lesquels se trouvent au niveau d'un point intermédiaire entre un point de dérivée de courbure élevée et un point suivant de dérivée de courbure faible (150). Ces points limites ne sont pas influencés par des valeurs absolues de courbures mais uniquement par des changement relatifs dans la courbure. Les points limites des segmentations de traits sont transmis à un identificateur de traits destiné à l'interprétation de l'entrée manuscrite (170).

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