Method for the correlation of three dimensional measurements...

G - Physics – 01 – B

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G01B 11/24 (2006.01)

Patent

CA 2198022

Method for the correlation of three dimensional measurements obtained by at least one first (1) and one second (2) image capturing unit. The method comprises, for the calibration phase, the steps of: producing a calibrating ball (4) movably and rotatably mounted about an axis (7), successively and rotatingly shifting the calibrating ball (4) into the measuring positions which are visible to the acquisition units; measuring, for each of the measuring positions, the spherical cap seen by each of the image capturing units; determining, for each of the measuring positions, the center of the calibrating ball, to express the same reference frame in the first and second reference marks viewed by the first and second image capturing units respectively; calculating the matrix of the passage from the first reference mark to the second reference mark to correlate the measurements between the first and second optical image capturing units.

L'invention concerne un procédé de corrélation des mesures tridimensionnelles réalisées par au moins un premier (I) et un deuxième (II) systèmes d'acquisition d'images. Pour la phase de calibration, le procédé consiste: à réaliser une sphère étalon (4) montée mobile en rotation autour d'un axe (7), à déplacer, par rotations successives, la sphère étalon (4) pour la placer dans des positions de mesure visibles par les systèmes d'acquisition, à mesurer, pour chacune des positions de mesure, la calotte de la sphère étalon vue par chacun des systèmes d'acquisition, à déterminer, pour chacune de positions de mesure, le centre de la sphère étalon, afin de permettre d'exprimer le même référentiel dans des premier et deuxième repère vus, respectivement, par les premier et deuxième systèmes d'acquisition, et à calculer la matrice de passage entre 1es premier et deuxième repères, afin d'assurer une corrélation des mesures entre les premier et deuxième systèmes optiques d'acquisition d'images.

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