Method and apparatus for object tracking of mobile robots using 2d lidar-based markers

Patent metadata

Field	Value
Publication number	US-2024377535-A1
Application number	US-202418643586-A
Country	US
Kind code	A1
Filing date	Apr 23, 2024
Priority date	May 9, 2023
Publication date	Nov 14, 2024
Grant date	—

Abstract

Provided is a method for estimating a pose of a target object using a 2D LiDAR-based marker in a mobile robot, the method including acquiring first point cloud data including distance and reflection intensity information using a 2D LiDAR sensor of a mobile robot, extracting second point cloud data corresponding to a high-brightness reflective material included in a marker attached to an object from the first point cloud data, clustering the second point cloud data into at least one cluster, identifying a target cluster corresponding to the target object among the at least one cluster, and estimating a pose of the target object based on change in the target cluster.

First claim

What is claimed is:

1 . A method for estimating a pose of a target object using a 2D LiDAR-based marker in a mobile robot, the method comprising:
acquiring first point cloud data including distance and reflection intensity information using a 2D LiDAR sensor of a mobile robot; extracting second point cloud data corresponding to a high-brightness reflective material included in a marker attached to an object from the first point cloud data; clustering the second point cloud data into at least one cluster; identifying a target cluster corresponding to the target object among the at least one cluster; and estimating a pose of the target object based on change in the target cluster.

2 . The method of claim 1 , wherein the marker attached to the object comprises a plurality of high-brightness reflective materials having different sizes.

3 . The method of claim 1 , wherein the extracting comprises extracting, as the second point cloud data, point cloud data having a value of reflection intensity equal or greater than a threshold among the first point cloud data.

4 . The method of claim 1 , wherein the clustering comprises performing distance-based clustering on the second point cloud data.

5 . The method of claim 1 , wherein the identifying comprises comparing a shape of the at least one cluster with a preset shape to identify the target cluster corresponding to the target object.

6 . The method of claim 1 , wherein the estimating comprises:
dividing the target cluster into a first group and a second group based on position information of the points of the point cloud data included in the target cluster; acquiring a ratio between the number of the points of the point cloud data included in the first group and the number of the points of the point cloud data included in the second group; and estimating the pose of the target object based on the change in the ratio.

7 . The method of claim 1 , further comprising:
controlling a behavior of the mobile robot based on the estimated pose of the target object.

8 . A device for estimating a pose of a target object using a 2D LiDAR-based marker in a mobile robot, the device comprising:
at least one memory storing computer-executable instructions; and at least one processor, wherein the at least one processor is configured to execute the computer-executable instructions to: acquire first point cloud data including distance and reflection intensity information using a 2D LiDAR sensor of a mobile robot; extract second point cloud data corresponding to a high-brightness reflective material included in a marker attached to an object from the first point cloud data; cluster the second point cloud data into at least one cluster; identify a target cluster corresponding to the target object among the at least one cluster; and estimate a pose of the target object based on change in the target cluster.

9 . The device of claim 8 , wherein the marker attached to the object comprises a plurality of high-brightness reflective materials having different sizes.

10 . The device of claim 8 , wherein the at least one processor is configured to extract, as the second point cloud data, point cloud data having a value of reflection intensity equal or greater than a threshold among the first point cloud data.

11 . The device of claim 8 , wherein the at least one processor is configured to perform distance-based clustering on the second point cloud data.

12 . The device of claim 8 , wherein the at least one processor is configured to compare a shape of the at least one cluster with a preset shape to identify a target cluster corresponding to the target object.

13 . The device of claim 8 , wherein the at least one processor is configured to divide the target cluster into a first group and a second group based on position information of the points of the point cloud data included in the target cluster, acquire a ratio between the number of the points of the point cloud data included in the first group and the number of the points of the point cloud data included in the second group, and estimate the pose of the target object based on the change in the ratio.

14 . The device of claim 8 , wherein the at least one processor is further configured to control a behavior of the mobile robot based on the estimated pose of the target object.

15 . A computer-readable recording medium having instructions stored therein, wherein the instructions are executed by the computer to cause the computer to:
acquire first point cloud data including distance and reflection intensity information using a 2D LiDAR sensor of a mobile robot; extract second point cloud data corresponding to a high-brightness reflective material included in a marker attached to an object from the first point cloud data; cluster the second point cloud data into at least one cluster; identify a target cluster corresponding to the target object among the at least one cluster; and estimate a pose of the target object based on change in the target cluster.

Assignees

• Nat Univ Chungbuk Ind Acad Coop Found

Inventors

• Park Tae Hyoung
• Lee Jun Hyeok

Classifications

• Y10S901/01

  Mobile robot · CPC title

• G05D2109/10

  Land vehicles · CPC title

• G05D2101/10

  using artificial intelligence [AI] techniques · CPC title

• G01S17/931

  of land vehicles · CPC title

• G01S17/93

  for anti-collision purposes · CPC title