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Stable keypoints selection for 2D LiDAR based place recognition with map data reduction

Published online by Cambridge University Press:  25 April 2022

Lounis Douadi*
Affiliation:
Université de Rouen Normandie, LITIS (laboratoire d’informatique, du traitement de l’information et des systèmes), Saint-Étienne-du-Rouvray 76800, France
Yohan Dupuis
Affiliation:
CESI (centre des études supérieures industrielles), LINEACT (laboratoire d’innovation numérique pour les entreprises et les apprentissages au service de la compétitivité des territoires), Paris La Défense 92074, France
Pascal Vasseur
Affiliation:
Université de Picardie Jules Verne, Laboratoire MIS (modélisation, information, systèmes), Amiens 80080, France
*
*Corresponding author. E-mail: lounis.douadi@gmail.com

Abstract

This paper presents a new feature based approach for place recognition using 2D LiDAR (Light Detection And Ranging) data. The main contribution lies in the mapping process. It includes a keypoint selection strategy to model places with persistent keypoints from concatenated LiDAR scans. Our objective is to achieve map data reduction while maintaining good place recognition performace. LiDAR scans are concatenated with a registration algorithm and keypoints are extracted from each scan. Based on a regular grid, our approach measures the occurrence of similar keypoints in each region of interest defined by a grid cell. Only keypoints with occurrences beyond a threshold, qualified as stable keypoints, are kept in the place model called submap. The environment is therefore modeled as a collection of submaps, which constitutes the global map. Place recognition consists in submap matching followed by a two steps geometric verification. In the first stage, optimal parameters are set using corrected data. Mapping parameters satisfy six criteria among which is the spatial distribution distance, which represents another contribution of our work. It gives a measure on how well keypoints are distributed in space. Place recognition optimal parameters are set through global localization. In the second stage, the approach is evaluated using raw data in the contexts of global localization, and loop closure detection in a SLAM framework. The results obtained using popular real data sets show that our approach achieves significant map data reduction (up to $92\%$) while maintaining good place recognition performance, comparable to state-of-the-art methods.

Information

Type
Research Article
Copyright
© The Author(s), 2022. Published by Cambridge University Press

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