System and method for capturing a range image of reflective...

G - Physics – 01 – B

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G01B 11/02 (2006.01) G01C 11/00 (2006.01) G06K 9/46 (2006.01)

Patent

CA 2220826

A system and method for imaging reflective surfaces is disclosed wherein a diffused light source having a predetermined frequency range and in a predetermined pattern is directed toward the reflective surface. The light reflecting off the surface passes through a filter for filtering out ambient light and reaches a detector. The detector detects the light. Using triangulation with two points within the pattern, a microprocessor determines a distance to an image formed behind the reflective surface. The microprocessor also calculates a distance to the reflective surface in dependence upon the distance to the image and the locations of the diffused light source and of the detector. Alternatively, two detectors are used, requiring a point source of diffused light.

Système et méthode de formation d'images sur des surfaces réfléchissantes. Une source de lumière diffuse, ayant une gamme de fréquences et un motif prédéterminés, est dirigée sur la surface réfléchissante. Afin de filtrer la lumière ambiante, la lumière réfléchie sur la surface traverse un filtre. Elle atteint ensuite un détecteur qui la capte. Selon une triangulation comportant deux points dans le motif, un microprocesseur détermine la distance d'une image formée derrière la surface réfléchissante. Le microprocesseur calcule aussi la distance de la surface réfléchissante, en relation avec la distance de l'image ainsi que le lieu de la source de lumière diffuse et du détecteur. Selon une autre application, on utilise deux détecteurs, ce qui nécessite une source ponctuelle de lumière diffuse.

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