Registering of a scene disintegrating into clusters with visualized clusters

Patent metadata

Field	Value
Publication number	US-9342890-B2
Application number	US-201514671197-A
Country	US
Kind code	B2
Filing date	Mar 27, 2015
Priority date	Apr 2, 2014
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

A method for optically scanning and measuring a scene by a three-dimensional (3D) measurement device in which multiple scans are generated to then be registered in a joint coordinate system of the scene. At first at least one cluster is generated from at least one scan, further scans are registered for test purposes in the coordinate system of the cluster, if specified quality criteria are fulfilled and the generated clusters are then joined, for which purpose clusters are selected, registered for test purposes and registering is confirmed if appropriate, wherein the clusters to be joined are visualized with an optional possibility for the user to intervene, for supporting the selection of clusters.

First claim

What is claimed is:

1. A method for optically scanning and measuring a scene by a three-dimensional (3D) measurement device in which multiple scans are generated by the device, and the multiple scans are then registered in a joint coordinate system of the scene, comprising:
generating at least one cluster from at least one scan of the multiple of scans;
registering additional scans from the multiple of scans for test purposes in a coordinate system of the generated at least one cluster;
confirming the registering of the additional scans if specified quality criteria are fulfilled; and
joining clusters generated from the additional scans by selecting at least two clusters and registering the at least two clusters for test purposes and confirming the registering, wherein the clusters to be joined are visualized for supporting user selection of the at least two clusters.

2. The method of claim 1 , wherein the clusters to be joined are visualized side by side in a compressed representation of all clusters.

3. The method of claim 1 , wherein progress of joining the clusters is shown.

4. The method of claim 1 , wherein the selected at least two clusters are shifted relative to each other.

5. The method of claim 4 , wherein the selected at least two clusters are shifted relative to each other such that point clouds associated with each of the at least two clusters overlap.

6. The method of claim 5 , wherein the selected at least two clusters which have been shifted relative to each other are set in spatial relationship to each other with information gained from input and output units, and that scans are selected from the selected at least two clusters to form pairs of selected scans.

7. The method of claim 6 , wherein the pairs of selected scans are registered for test purposes and registering is confirmed is specified quality criteria are fulfilled.

8. The method of claim 1 , wherein automatic registering for test purposes use targets in overlapping areas of the scans or point-based methods.

9. A 3D measurement device for carrying out the method of claim 1 , comprising a control and evaluation unit which determines, for a plurality of measuring points of every one of the scans at least a distance from the a center of the 3D measurement device to the object and registers the generated scans in a joint coordinate system of the scene.

10. The 3D measurement device of claim 9 , configured as a laser scanner comprising a base, a measuring head which is rotatable with regard to the base, a light emitter which emits an emission light beam, a light receiver which receives a reception light beam which is reflected by an object in the environment of the laser scanner or scattered otherwise, wherein the center of the laser scanner rests while a scan is made and is movable between the scans.

11. The 3D measurement device of claim 9 , further comprising a display unit for visualizing the clusters to be joined.

Assignees

• Faro Tech Inc

Inventors

• Becker Reinhard
• Ossig Martin
• Gittinger Jurgen
• Kramer Helmut

Classifications

• G01S17/89

  for mapping or imaging · CPC title

• G01S7/4817 Primary

  relating to scanning · CPC title

• G01C15/002 Primary

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

• G06T7/0032

  Physics · mapped topic

• G06T7/0075 Primary

  Physics · mapped topic