Map creation system and map creation method

Patent metadata

Field	Value
Publication number	US-11250622-B2
Application number	US-201616070755-A
Country	US
Kind code	B2
Filing date	Mar 7, 2016
Priority date	Mar 7, 2016
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

In order to create an accurate map with a simple operation, the map creation system includes: a relative position acquisition means to measure distances and directions from a sensor to points on a surface of an infrastructure or an object and to create point cloud data in a relative space with the sensor at the center thereof; a sensor position acquisition means to measure the position and the attitude of the sensor and to create sensor position data; an absolute position calculation means to calculate position information of the point cloud in the absolute space on the basis of the point cloud data in the relative space and the sensor position data; a direction-vector calculation means to obtain a direction vector from the sensor to each point of the point cloud in the absolute space on the basis of the point cloud data in the relative space and the sensor position data; an area detection means to extract points composing a plane area on the basis of the position information and the direction vectors of the point cloud in the absolute space and to obtain the area outline on the basis of the distribution of the extracted points; and a drawing means to draw a picture representing the detected area outline with a line.

First claim

The invention claimed is:

1. A map creation system, comprising:
a relative position detector to measure distances and directions from a sensor to points on a surface of an infrastructure or an object and to create point cloud data in a relative space with the sensor at a center thereof;
a sensor position detector to measure a position and an attitude of the sensor and to create sensor position data;
a processor to execute a program; and
a memory to store the program which, when executed by the processor, performs processes of:
calculating position information of a point cloud in an absolute space on the basis of the point cloud data in the relative space and the sensor position data;
obtaining a direction vector from the sensor to each of points of the point cloud in the absolute space on the basis of the point cloud data in the relative space and the sensor position data;
extracting points composing a plane area on the basis of the position information and the direction vectors of the point cloud in the absolute space to obtain an area outline on the basis of distribution of the extracted points,
the extraction process including setting a reference plane to provide a reference in a three-dimensional space,
the extraction process including extracting a point whose neighborhood points have direction vector distribution that fits vector distribution calculated from positional relationships between the reference plane and the sensor position data, and not extracting a point whose neighboring points have direction vector distribution that does not fit the calculated vector distribution; and

drawing a picture representing an outline of a detected area with a line based on the extracted point.

2. A map creation method, comprising:
distances and directions from a sensor to points on a surface of an infrastructure or an object to create point cloud data in a relative space with the sensor at a center thereof;
measuring a position and an attitude of the sensor to create sensor position data;
calculating position information of a point cloud in an absolute space on the basis of the point cloud data in the relative space and the sensor position data;
obtaining a direction vector from the sensor to each of points of the point cloud in the absolute space on the basis of the point cloud data in the relative space and the sensor position data;
extracting points composing a plane area on the basis of the position information and the direction vectors of the point cloud in the absolute space to obtain an area outline on the basis of distribution of the extracted points,
the extraction including setting a reference plane to provide a reference in a three-dimensional space,
the extraction including extracting a point whose neighborhood points have direction vector distribution that fits vector distribution calculated from positional relationships between the reference plane and the sensor position data, and not extracting a point whose neighboring points have direction vector distribution that does not fit the calculated vector distribution; and

drawing a picture representing an outline of a detected area with a line based on the extracted point.

Assignees

• Mitsubishi Electric Corp

Inventors

• Wakimoto Koji

Classifications

• G06T7/521 Primary

  from laser ranging, e.g. using interferometry; from the projection of structured light · CPC title

• G06T17/05 Primary

  Geographic models · CPC title

• G09B29/003

  Maps · CPC title

• G01B11/24 Primary

  for measuring contours or curvatures · CPC title

• G01C7/00

  Tracing profiles (by photogrammetry or videogrammetry G01C11/00) · CPC title