The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 2021
Filed:
Jul. 27, 2017
Vehicle Service Group, Llc, Madison, IN (US);
Aivaras Alfonsas Grauzinis, Schilde, BE;
Geert Willems, Hechtel-Eksel, BE;
Vehicle Service Group, LLC, Madison, IN (US);
Abstract
A hybrid 3D optical scanning system combining methodologies of active stereo 3D reconstruction and deflectometry to provide accurate 3D surface measurements of an object under inspection. In a preferred embodiment, the present system comprises a calibrated digital camera stereo pair and first digital projector for active stereo 3D reconstruction metrology positioned at selected distance apart on the same horizontal plane facing the inspection object at an optimal incidence angle relative to the object surface. A secondary digital projector for deflectometry is directed to project a pattern sequence across the optical projection path of the first digital projector and onto a nonplanar deflection screen extended between the digital camera and the inspection object at a selected angle relative thereto, the selected angle being chosen so that that the pattern projected onto the deflection screen by the secondary digital projector reflects from the surface of the inspection object towards the digital camera. Calibrated active stereo 3D reconstruction is used to derive global shape and the uncalibrated nonplanar deflected light acquires curvature of local fine deformations and surface imperfections along the object surface. The calibrated camera allows per pixel correlations to be defined between the separate acquisition methods and produces accurate absolute measurements of both shape and local features of specular, glossy, metallic curved surfaces.