Using a two-dimensional scanner to speed registration of three-dimensional scan data

Patent metadata

Field	Value
Publication number	US-9739886-B2
Application number	US-201414559290-A
Country	US
Kind code	B2
Filing date	Dec 3, 2014
Priority date	Oct 5, 2012
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A method for measuring and registering 3D coordinates has a 3D scanner measure a first collection of 3D coordinates of points from a first registration position. A 2D scanner collects horizontal 2D scan sets as 3D measuring device moves from first to second registration positions. A processor determines first and second translation values and a first rotation value based on collected 2D scan sets. 3D scanner measures a second collection of 3D coordinates of points from second registration position. Processor adjusts second collection of points relative to first collection of points based at least in part on first and second translation values and first rotation value. Processor identifies a correspondence among registration targets in first and second collection of 3D coordinates, and uses this correspondence to further adjust the relative position and orientation of first and second collection of 3D coordinates.

First claim

What is claimed is:

1. A three-dimensional (3D) measuring device comprising:
a processor system including at least one of a 3D scanner controller, a two-dimensional (2D) scanner processor, an external computer, and a cloud computer configured for remote network access;
a 3D scanner having a first light source, a first beam steering unit, a first angle measuring device, a second angle measuring device, and a first light receiver, the first light source configured to emit a first beam of light, the first beam steering unit configured to steer the first beam of light to a first direction onto a first object point, the first direction determined by a first angle of rotation about a first axis and a second angle of rotation about a second axis, the first angle measuring device configured to measure the first angle of rotation and the second angle measuring device configured to measure the second angle of rotation, the first light receiver configured to receive first reflected light, the first reflected light being a portion of the first beam of light reflected by the first object point, the first light receiver configured to produce a first electrical signal in response to the first reflected light, the first light receiver configured to cooperate with the processor system to determine a first distance to the first object point based at least in part on the first electrical signal, the 3D scanner configured to cooperate with the processor system to determine 3D coordinates of the first object point based at least in part on the first distance, the first angle of rotation and the second angle of rotation;
a 2D scanner accessory including a 2D scanner, the 2D scanner having a second light source, a second beam steering unit, a third angle measuring device, and a second light receiver, the second light source configured to emit a second beam of light, the second beam steering unit configured to steer the second beam of light to a second direction onto a second object point, the second direction determined by a third angle of rotation about a third axis, the third angle measuring device configured to measure the third angle of rotation, the second light receiver configured to receive second reflected light, the second reflected light being a portion of the second beam of light reflected by the second object point, the second light receiver configured to produce a second electrical signal in response to the second reflected light, the 2D scanner configured to cooperate with the processor system to determine a second distance to the second object point based at least in part on the second electrical signal, the 2D scanner further configured to cooperate with the processor system to determine 2D coordinates of the second object point based at least in part on the second distance and the third angle of rotation;
a moveable platform configured to carry the 3D scanner and the 2D scanner, the 3D scanner being fixed relative to the 2D scanner, the moveable platform being configured for motion on a plane perpendicular to the third axis;
wherein the processor system is responsive to executable instructions which when executed by the processor system is operable to:
cause the 3D scanner, while fixedly located at a first registration position, to cooperate with the processor system to determine 3D coordinates of a first collection of points on an object surface;
cause the 2D scanner, while moving from the first registration position to a second registration position, to cooperate with the processor system to obtain a plurality of 2D scan sets, each of the plurality of 2D scan sets being a set of 2D coordinates of points on the object surface, each of the plurality of 2D scan sets being collected by the 2D scanner at a different position relative to the first registration position;
determine a first translation value corresponding to a first translation direction, a second translation value corresponding to a second translation direction, and a first rotation value corresponding to a first orientational axis, wherein the first translation value, the second translation value, and the first rotation value are determined based at least in part on a fitting of the plurality of 2D scan sets according to a first mathematical criterion;
cause the 3D scanner, while fixedly located at the second registration position, to cooperate with the processor system to determine 3D coordinates of a second collection of points on the object surface;
identify a correspondence among registration targets present in both the first collection of points and the second collection of points, the correspondence based at least in part on the first translation value, the second translation value, and the first rotation value; and
determine 3D coordinates of a registered 3D collection of points based at least in part on a second mathematical criterion, the determined correspondence among registration targets, the 3D coordinates of the first collection of points, and the 3D coordinates of the second collection of points.

2. The 3D measuring device of claim 1 , wherein the 2D scanner accessory further includes a position/orientation sensor, the position orientation sensor includes at least one sensor selected from the group consisting of an inclinometer, a gyroscope, a magnetometer, and an altimeter.

3. The 3D measuring device of claim 1 , wherein the moveable platform is a tripod having wheels and a brake.

4. The 3D measuring device of claim 1 , wherein the first beam steering unit includes a first mirror configured to rotate about a horizontal axis and a carriage that holds the first mirror configured to rotate about a vertical axis, the rotation about the horizontal axis being driven by a first motor and the rotation about the vertical axis being driven by a second motor.

5. The 3D measuring device of claim 1 , wherein the processor is further configured to respond to a stopping signal to cause the 3D scanner, while fixedly located at the second registration position, to automatically begin cooperating with the processor system to determine 3D coordinates of a second collection of points on the object surface.

6. The 3D measuring device of claim 5 , wherein the stopping signal is generated in response to a signal received by the processor system from the position/orientation sensor.

7. The 3D measuring device of claim 1 , wherein the registration targets are natural features of the object surface.

8. A method for measuring and registering three-dimensional (3D) coordinates comprising:
providing a 3D measuring device that includes a processor system, a 3D scanner, a two-dimensional (2D) scanner accessory, and a moveable platform,
the processor system having at least one of a 3D scanner controller, a 2D scanner processor, an external computer, and a cloud computer configured for remote network access,
the 3D scanner having a first light source, a first beam steering unit, a first angle measuring device, a second angle measuring device, and a first light receiver, the first light source configured to emit a first beam of light, the first beam steering unit configured to steer the first beam of light to a first direction onto a first object point, the first direction determined by a first angle of rotation about a first axis and a second angle of rotation about a second axis, the first angle measuring device configured to measure the first angle of rotation and the second angle measuring device configured to measure the second angle of rotation, the first light receiver configured to receive first reflected light, the first reflected light being a portion of the first beam of light reflected by the first object point, the first light receiver configured to produce a first electrical signal in response to the first refle

Assignees

• Faro Tech Inc

Inventors

• Zweigle Oliver
• Becker Bernd-Dietmar
• Becker Reinhard

Classifications

• G01S17/86 Primary

  Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders · CPC title

• G01C15/002

  Active optical surveying means (optical plumbing G01C15/105) · CPC title

• G01B11/272

  using photoelectric detection means · CPC title

• G01S17/89

  for mapping or imaging · CPC title

• G01S17/87

  Combinations of systems using electromagnetic waves other than radio waves · CPC title