Overview

This package implements the next best view estimation for the needs of the mobile 3D semantic mapping. As the mobile robot enters the room, it turns and scans repeatedly to get as much information as possible about its surroundings. Then it estimates the next best view poses and drives to a selected reachable location in the provided 2D map that would increase the coverage of the scans further. It repeats the process until it is deemed that the remaining occlusions are either too small or not scannable by the sensor setup.

Techniques

In greater detail, to obtain a list of suggested new scanning poses, we make the following steps:

  • mark each voxel in the volume of the room as free, ocupied or unknown (the remaning ones) based on a
    raytracing approach;

  • select those unknown voxels which have at least one free neighbor (meaning that they could be scanned in the next steps);
  • estimate the normals in some of the points of this boundary surface;
  • mark the connected components that have similar surface normals and filter those that are either too high or too low, as they are outside of the sensor's reach;
  • assume that the biggest surface patches cover bigger unknown volumes. Multiple scan poses that are directed towards the unknown space are then generated.

The following figures depict 3D point cloud of a household enviroment at IAS and the estimated surfaces covering unknown volumes after first scan: firstshot.png

After second scan:

second_shot.png

After the third, final scan:

third_shot.png

Usage:

Please see tutorials on the right in order to learn about how to use ODUFinder.

Wiki: next_best_view (last edited 2010-10-02 23:44:56 by Dejan Pangercic)