Method and device for three-dimensional surface detection...

G - Physics – 01 – B

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G01B 11/25 (2006.01) A61B 5/107 (2006.01) G06T 7/00 (2006.01)

Patent

CA 2762038

The surface shape of a three-dimensional object is acquired with an optical sensor. The sensor, which has a projection device and a camera, is configured to generate three-dimensional data from a single exposure, and the sensor is moved relative to the three-dimensional object, or vice versa. A pattern is projected onto the three- dimensional object and a sequence of overlapping images of the projected pattern is recorded with the camera. A sequence of 3D data sets is determined from the recorded images and a registration is effected between subsequently obtained 3D data sets. This enables the sensor to be moved freely about the object, or vice versa, without tracking their relative position, and to determine a surface shape of the three-dimensional object on the fly.

La forme de la surface d'un objet tridimensionnel est acquise avec un capteur optique. Le capteur, qui comporte un dispositif de projection et une caméra, est conçu pour générer des données tridimensionnelles à partir d'une seule exposition, et le capteur est déplacé par rapport à l'objet tridimensionnel, ou vice versa. Un modèle est projeté sur l'objet tridimensionnel et une séquence d'images se chevauchant du modèle projeté est enregistrée avec la caméra. Une séquence de jeux de données 3D est déterminée à partir des images enregistrées et un enregistrement est effectué entre des jeux de données 3D obtenus par la suite. Cela permet que le capteur soit déplacé librement autour de l'objet, ou vice versa, sans suivre leur position relative, et de déterminer une forme de la surface de l'objet tridimensionnel à la volée.

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