Method for calibrating the initial position and the...

G - Physics – 05 – D

Patent

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G05D 1/03 (2006.01) G01B 11/275 (2006.01) G06T 7/00 (2006.01)

Patent

CA 2275957

The invention concerns a method for calibrating a camera (4, 22) arranged on a mobile support (21), wherein the camera takes a test object image formed of at least three marks appearing in the camera field, and the analysis of said image gives the initial position and orientation of the camera relative to that of the test object image, known in an application. The support (21) can then be displaced towards an object (28) whereof the camera takes images. Since the support displacements are accurately measured, the analysis of the object images gives the accurate position and orientation of the object relative to the camera and relative to the test object. One application consists in the survey of road signs (28) for constituting databases for managing a network or for an on-board navigation system.

Procédé d'étalonnage d'une caméra (4, 22) disposée sur un support mobile (21). La caméra prend une image d'une mire formée d'au moins trois marques apparaissant dans le champ de la caméra, et l'analyse de l'image donne la position et l'orientation initiales de la caméra par rapport à celle de la mire, qui sont connues dans une application. Le support (21) peut alors être déplacé vers un objet (28) dont la caméra prend des images. Comme les déplacements du support sont mesurés avec précision, l'analyse des images de l'objet donne la position et l'orientation précises de l'objet par rapport à la caméra et par rapport à la mire. Une application est le recensement de panneaux routiers (28) pour constituer des bases de données de gestion du réseau ou pour système de navigation embarqué.

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