Method and arrangement for detecting the spatial form of an object
First Claim
1. A method of detecting the 3D shape of an object, wherein a plastically deformable mass is provided which has at least one surface portion provided with markers adapted to be evaluated photogrammetrically, the object is impressed on the surface portion into the mass such that the mass deforms under load of the object and an impression is formed in the deformed mass corresponding to the 3D shape of the object such that the markers are shifted spatially with respect to their positions in the mass prior to deformation and with regard to the depth of the impression, the object is removed from the deformed mass, a plurality of images are taken of the shifted markers provided on the impression formed in the deformed mass from respective different views, and the 3D shape of the object is determined from the images by means of a photogrammetric process.
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Abstract
The invention relates to a method of detecting the 3D shape of objects, in which the object is pressed into a plastically deformable mass provided with markers adapted to be evaluated photogrammetrically. After removal of the object from the marked mass, a plurality of photogrammetric images are taken from different views, and the images are evaluated photogrammetrically, the 3D shape of the object being calculated using an association of the markers corresponding in the images. The invention further relates to a corresponding arrangement for carrying out the method and is particularly suited for the detection of the 3D shape of objects whose 3D shape changes under load. One example of this would be the measurement of human feet.
20 Citations
24 Claims
- 1. A method of detecting the 3D shape of an object, wherein a plastically deformable mass is provided which has at least one surface portion provided with markers adapted to be evaluated photogrammetrically, the object is impressed on the surface portion into the mass such that the mass deforms under load of the object and an impression is formed in the deformed mass corresponding to the 3D shape of the object such that the markers are shifted spatially with respect to their positions in the mass prior to deformation and with regard to the depth of the impression, the object is removed from the deformed mass, a plurality of images are taken of the shifted markers provided on the impression formed in the deformed mass from respective different views, and the 3D shape of the object is determined from the images by means of a photogrammetric process.
- 16. An arrangement for detecting the 3D shape of an object by photogrammetry, comprising an imaging system for obtaining photogrammetric images and a system for photogrammetrically evaluating the images and for determining the 3D shape of the object, wherein the arrangement further comprises a plastically deformable mass operable to deform under load of the object such that an impression is formed in the deformed mass corresponding to the 3D shape of the object which has at least one surface portion provided with markers adapted to be evaluated photogrammetrically, said markers being configured to shift spatially with respect to their positions in the mass prior to deformation and with regard to the depth of the impression when the mass deforms under load of the object such that said images are of the shifted markers provided on the impression formed in the deformed mass.
Specification