Method and arrangement for detecting the spatial form of an object
Assigneecorpus.e AG
InventorRobert Massen
Life of this patent
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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.
Claims24
A method of detecting the 3D shape of an object (3), wherein a plastically deformable mass (2) is provided which has at least one surface portion (7) provided with markers (4) adapted to be evaluated photogrammetrically, the object is impressed on the surface portion (7) into the mass (2) such that the mass (2) deforms corresponding to the 3D shape of the object (3), the object (3) is removed from the deformed mass (2), a plurality of images are taken of the deformed mass (2) provided with the markers (4) from respective different views, and the 3D shape of the object (3) is determined from the images by means of a photogrammetric process.
The method as claimed in any of the preceding claims, wherein the markers consist of point markers and area markers, each of the area markers comprising a plurality of point markers, forming a background of the point markers, and having a characteristic optical configuration.
The method as claimed in any of the preceding claims, wherein the plastically deformable mass is provided in a mold (1) which serves to hold the mass.
The method as claimed in any of the preceding claims, wherein the object (3) is a body part of a person, whose 3D shape is to be measured under load.
The method as claimed in any of the preceding claims, wherein the plastically deformable mass provided is a reversibly deformable mass which, once the images have been taken, is returned to its original form which it had taken prior to the impression by the object.
The method as claimed in any of the preceding claims, wherein prior to obtaining the images, a measuring rod is arranged beside the surface portion of the deformable mass bearing the markers adapted to be evaluated photogrammetrically, the measuring rod having arranged thereon at least two markers at a known distance from each other, adapted to be evaluated photogrammetrically.
An arrangement for detecting the 3D shape of an object by photogrammetry, comprising an imaging system (5) for obtaining photogrammetric images and a system for photogrammetrically evaluating the images and for determining the 3D shape of the object, characterized in that the arrangement further comprises a plastically deformable mass (2) which has at least one surface portion (7) provided with markers (4) adapted to be evaluated photogrammetrically.
Dependencies are inferred from the claim text.