Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Friedrich-Schiller-Universitaet Jena

Friedrich-Schiller-Universitat Jena

Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.v.

Stefan Heist

Gunther Notni

Peter Kühmstedt

Ingo Schmidt

Kevin Srokos

Peter Lutzke

Martin Landmann

Patrick Dietrich

A device, for spatially measuring surfaces, includes a projector for projecting patterns into an object space, two cameras for recording pictures of a surface in the object space, and a control and evaluation unit for activating the cameras and evaluating the pictures. The projector includes a light source, a projection lens, at least one rotatably arranged pattern structure, and a drive for rotating the at least one pattern structure. The control and evaluation unit to: activate the cameras for simultaneously recording a picture at each of a plurality of successive points in time; identify corresponding points in the picture planes of the cameras, by way of evaluating a correlation function between the sequences of brightness values acquired for potentially corresponding points and maximizing a value of the correlation; and determine spatial coordinates of surface points by way of triangulation on the basis of the identified corresponding points.

Device and method for spatially measuring surfaces

Method and device for non-contact measuring of surface contours. A sequence of stripe patterns, formed from a plurality of stripes of equal stripe direction are projected on a surface to be measured, wherein the stripe patterns are each aperiodic and have a sinusoidal brightness distribution and wherein, during the projecting of each of the stripe patterns, at least one image of the surface is captured by at least one camera. By the stripe pattern projected on the surface, corresponding points in the image planes of a camera and of a projection device used for projecting, or in the image planes of the cameras, are then identified by maximizing a correlation between sequences of brightness values recorded for each of the points, whereupon spatial coordinates of surface points on the surface are determined via triangulation on the basis of points identified as corresponding.

Method and device for the contact-free measurement of surface contours

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Jena, Germany

Stefan Heist