Steinbichler Optotechnik Gmbh

Carl Zeiss Industrielle Messtechnik Gmbh

Carl Zeiss Optotechnik Gmbh

Alexander Frey

Marcus Steinbichler

Thomas Mayer

Christian Schleith

Markus Basel

Tom Jaeckel

Daniel Kreutzer

A method for determining an exposure, in particular an exposure time, for a recording in a method for determining the 3D coordinates of an object is provided, in which a pattern is projected onto the object and the light reflected by the object is recorded. To improve such a method, a recording of the object is produced with a predetermined exposure, in particular exposure time. A mask image of this recording is produced, in which mask image the regions of the object lying within the measurement volume are depicted. The exposure, in particular the exposure time, for the recording is determined depending on the predetermined exposure, in particular exposure time, depending on the mean greyscale value in the regions, lying within the measurement volume, of the recording with a predetermined exposure and depending on an ideal greyscale value.

Method for determining the exposure time for a 3D recording

In a process for determining the 3D coordinates of an object (), a partial surface of the object () is recorded by a 3D measuring device (), and the 3D coordinates of this partial surface of the object () are determined. Additional partial surfaces of the object () are recorded by the 3D measuring device (), and the 3D coordinates of these partial surfaces are determined. The 3D coordinates of the partial surfaces of the object () are assembled by a processing device (). In order to improve this process, the exposures and/or the 3D coordinates of one or more partial surfaces of the object () are represented on a head-mounted display () (FIG.1).

Process and device for determining the 3D coordinates of an object

In a method for 3D digitization of an object (), a plurality of camera images of the object are recorded and assembled to determine the 3D coordinates of the object. To improve such method, pictures are taken from the object (), from which 2D feature points () of the object () are determined. The 3D coordinates of the 2D feature points are determined. The 2D point correspondences () between the 2D feature points of a picture and the 2D feature points of another picture are determined. Several of these 2D point correspondences are selected, and an associated 3D transformation is determined. The quality of this 3D transformation is determined with reference to the transformed 3D coordinates of the 2D feature points. Valid 3D feature points are determined therefrom. For assembling the camera images of the object (), the 3D coordinates of the valid 3D feature points are used.

Method and apparatus for 3D digitization of an object

In a method for the determination of the 3D coordinates of an object (), a pattern is projected () onto the object () and the pattern reflected by the object () is taken () and evaluated. To improve such a method, a pattern is projected onto a first part region () of the object () in a first step and the pattern reflected by this part region () of the object () is taken. In a second step, a pattern is projected onto a second part region of the object () and the pattern reflected by this part region of the object () is taken. The patterns taken are evaluated.

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Bernau a. Chiemsee, Germany

Alexander Frey