Granted Patent B2

US 12,329,535 · App. 18/230,369 · Granted Jun 17, 2025

Inventors: Gemma Taverni (Zürich, CH); Hakki Karaman (Uster, CH); Stefan Geissbühler (Langenthal, CH); Simon Mark (Thal, CH); Zheng Yang (Friedrichshafen, DE); Burkhard Böckem (Jonen AG, CH); Lukas Buchmann (Zürich, CH); Sandra Tobler (Berneck, CH); Jan Glückert (Lindau, DE); Markus Wettstein (Wädenswil, CH)

Assignee: HEXAGON TECHNOLOGY CENTER GMBH

A61B5/441A61B5/0075A61B5/0077A61B5/0079A61B5/442A61B5/742G06T7/0012G06T7/40G06T17/00H04N23/56H04N23/90G06T2207/30088G06T2207/30196

Abstract

Claims (31)

1. A measuring system for measuring an object, in particular the skin of a person, the measuring system comprising

a capture device comprising a set of cameras and a set of illumination elements, and

a controlling and processing unit comprising at least a data acquisition functionality which is configured to provide surface data by activating at least a part of the illumination elements for illuminating the object with measuring light and capturing at least one image by detecting measuring light reflected at the object by means of at least a part of the cameras, wherein the set of illumination elements comprises at least three light sources configured and arranged for illuminating the object from at least three different poses, and the data acquisition functionality is configured to provide surface data by:

illuminating the object from the at least three different poses by performing at least three illumination steps with each illumination step providing illumination by one of the three light sources,

capturing at least three images by capturing an image for each of the illumination steps by means of at least a first camera of the set of cameras,

deriving surface topology information based on processing the at least three images and the at least three different poses of the light sources, and

the first camera comprises circular polarised capture filtering and the at least three light sources comprise circular polarised illumination filtering, wherein the capture filtering and the illumination filtering provide either identical circulation directions or opposite circulation directions.

2. The measuring system according to claim 1 , wherein the set of cameras comprises a second camera, wherein:

the first camera and the second camera both provide circular polarised capture filtering of the same circulation direction, or

the first camera provides circular polarised capture filtering of a circulation direction opposite to the circulation direction of the circular polarised capture filtering of the second camera,

wherein the data acquisition functionality is configured to execute:

additionally capturing at least three images by capturing an image for each of the illumination steps with the second camera, and

deriving the surface topology information based on additionally processing of the at least three images of the second camera.

3. The measuring system according to claim 2 , wherein the first camera and the second camera are fixedly arranged relative to each other and

the optical axis of the at first camera is transversally oriented relative to the optical axis of the second camera, in particular wherein the optical axes enclose an angle between 80° and 100°, in particular 90°, in particular when projecting the optical axes on a plane which is defined by at least one of the optical axes and a connecting line between the first camera and the second camera.

4. The measuring system according to claim 1 , wherein

the set of illumination elements comprises a first group of illumination elements comprising the at least three light sources and a second group of illumination elements comprising at least three further light sources configured and arranged for illuminating the object from at least three further different poses, wherein

the first group of the illumination elements and a second group of the illumination elements both provide circular polarised illumination filtering of the same circulation direction, or

the first group of the illumination elements provide circular polarised illumination filtering of a circulation direction opposite to the circulation direction of the circular polarised illumination filtering of the second group of illumination elements,

wherein the data acquisition functionality is configured to execute

additionally illuminating the object from at least three further different poses by performing at least three further illumination steps with each illumination step providing illumination by one of the three further light sources, and

deriving the surface topology information based on additionally processing the at least three further different poses of the at least three further light sources.

5. The measuring system according to claim 1 , wherein the at least three illumination steps and/or the at least three further illumination steps are performed successively, in particular by providing illumination by one of the three light sources and/or by one of the three further light sources different from a light source activated before.

6. The measuring system according to claim 1 , wherein the at least three illumination steps and/or the at least three further illumination steps are performed simultaneously, in particular by providing illumination by the at least three light sources and/or by the at least three further light sources at the same time, in particular wherein the illumination steps are performed by providing particular illumination wavelength with each of the light sources, wherein the particular illumination wavelengths of the light sources are different from each other respectively.

7. The measuring system according to claim 1 , wherein the capture device comprises an infinity mirror to provide defined positioning of the object, in particular of the person, relative to the capture device.

8. The measuring system according to claim 1 , wherein

the first camera is provided as high-resolution monochromatic cameras and

comprises a filter element which is configured to transmit light with a wavelength of the blue spectrum, and to block transmission of light with a wavelength besides the blue spectrum.

9. The measuring system according to claim 1 , wherein

the second camera is provided as high-resolution monochromatic cameras and

comprises a filter element which is configured to transmit light with a wavelength of the blue spectrum, in particular to transmit light with a wavelength out of a wavelength range between 380 nm and 500 nm, and to block transmission of light with a wavelength besides the blue spectrum, in particular to block light with a wavelength less than 380 nm and/or greater than 500 nm, in particular to block light with a wavelength out of a wavelength range between 500 nm and 1000 nm.

Assignments (2)

Continuity (2)

References Cited (24)