Method and system for detecting a boundary crossing for...

G - Physics – 09 – B

Patent

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G09B 29/00 (2006.01) G01C 21/36 (2006.01)

Patent

CA 2546284

Techniques for detecting boundary crossings may involve the use of rectangles that approximate a boundary. Data defining the rectangles may be retrieved, and a current location of a monitored device may be identified. The current location may be compared with the rectangles, and a determination that the current location is located within a rectangle may indicate a boundary crossing. To simplify the calculations on the monitored device, certain calculations may be performed in advance. For example, an angle between a selected side of a particular rectangle and an axis of the coordinate system may be determined, and the particular rectangle may be rotated by the angle to orient the rotated rectangle parallel to the axis of the coordinate system. Subsequently, location coordinates for a monitored device may be rotated and compared with a corresponding rotated rectangle to determine whether the monitored device is located within the particular rectangle.

L'invention porte sur des techniques de détection des franchissements de frontières utilisant des rectangles figurant approximativement les frontières. En retrouvant les données définissant les rectangles, on peut identifier la position actuelle d'un dispositif suivi. A cet effet, on compare la position actuelle avec les rectangles, et on en déduit un franchissement de frontière si on détermine qu'elle se trouve dans un rectangle donné. Pour simplifier les calculs relatifs au dispositif suivi, on peut en effectuer certains à l'avance. Par exemple, on peut déterminer l'angle formé par un côté sélectionné d'un rectangle particulier et l'un des axes d'un système de coordonnées, et faire pivoter le rectangle particulier de cet angle pour le rendre parallèle à l'axe du système de coordonnées, puis faire pivoter les coordonnées de position du dispositif suivi et les comparer avec celles du rectangle correspondant ayant pivoté pour déterminer si le dispositif suivi se trouve ou non dans le rectangle particulier.

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