DEVICE FOR OPTICALLY SCANNING AND MEASURING AN ENVIRONMENT

• US 20150042759A1
• Filed: 10/28/2014
• Published: 02/12/2015
• Est. Priority Date: 12/14/2012
• Status: Active Grant

• Current Assignee: Faro Technologies Incorporated
• Original Assignee: Faro Technologies Incorporated
• Inventors: Heidemann, Rolf, Ossig, Martin, Becker, Reinhard
• Granted Patent: US 9,115,986 B2
• Time in Patent Office: Days
• US Class Current: 348/46
• CPC Class Codes: G01B 11/25 by projecting a pattern, e.g. one or more lines, moiré fringes on the object G01B11/255 takes precedence ; image analysis for depth or shape recovery G06T7/50
• CPC Class Codes: G01B 11/2513 with several lines being projected in more than one direction, e.g. grids, patterns
• CPC Class Codes: G01B 11/2518 Projection by scanning of the object

Abstract

A device for optically scanning and measuring an environment is provided. The device includes a movable scanner having at least one first projector for producing at least one uncoded first pattern on an object in the environment. The scanner includes at least one camera for recording images of the object provided with the pattern and a controller coupled to the first projector and the camera. The device further includes at least one second projector which projects a stationary uncoded second pattern on the object while the scanner is moved. Wherein the controller has a processor configured to determine a set of three-dimensional coordinates of points on a surface of the object from a set of images acquired by the camera based at least in part on the first pattern. The controller is further configured to register the set of images relative based in part on the stationary second pattern.

Claims

1. A device for optically scanning and measuring an environment comprising:

a movable scanner having at least one first projector for producing at least one uncoded first pattern on an object in the environment, the scanner having at least one camera for recording images of the object provided with the pattern, and a controller coupled to the at least one first projector and the at least one camera;

at least one second projector is provided which projects a stationary uncoded second pattern on the object while the scanner is moved; and

wherein the controller has a processor configured to determine a set of three-dimensional coordinates of points on a surface of the object from a set of images acquired by the at least one camera based at least in part on the first pattern, the controller further being configured to register the set of images relative to each other based in part on the stationary second pattern.

2. The device according to claim 1, wherein the at least one second projector produces the stationary second pattern in the infrared wavelength range.

3. The device according to claim 1 wherein the at least one second projector produces the stationary second pattern in the ultraviolet range.

4. The device according to claim 2 wherein the uncoded at least one second projector produces a monochromatic stationary second pattern using a laser.

5. The device according to claim 1, wherein the first pattern is different than the second pattern.

6. The device according to claim 1, wherein the first pattern is different from the second pattern geometrically, with respect to time or with respect to wavelength of light.

7. The device according to claim 1, wherein the at least one camera is sensitive in the wavelength ranges of the first pattern and the stationary second pattern.

8. The device according to claim 1, wherein the stationary second pattern is a point pattern of light points.

9. The device according to claim 1, wherein the stationary second pattern is selected from a group comprising a line pattern and a combined pattern of points and lines.

10. The device according to claim 9 wherein elements of the stationary second pattern may vary with regard to geometry or time or spectrum.

11. The device according to claim 8, characterized in that the stationary second projector is selected from a group comprising:

a diffractive optical element, microlens device, a plurality of single lasers and a projected mask.