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HiTPR: Hierarchical Transformer for Place Recognition in Point Cloud
Zhixing Hou1; Yan Yan1; Chengzhong Xu2; Hui Kong3
2022-05
Conference NameIEEE International Conference on Robotics and Automation (ICRA)
Source Publication2022 International Conference on Robotics and Automation (ICRA)
Conference Date23-27 May 2022
Conference PlacePhiladelphia, PA, USA
Abstract

Place recognition or loop closure detection is one of the core components in a full SLAM system. In this paper, aiming at strengthening the relevancy of local neighboring points and the contextual dependency among global points simultaneously, we investigate the exploitation of transformer-based network for feature extraction, and propose a Hierarchical Transformer for Place Recognition (HiTPR). The HiTPR consists of four major parts: point cell generation, short-range transformer (SRT), long-range transformer (LRT) and global descriptor aggregation. Specifically, the point cloud is initially divided into a sequence of small cells by down-sampling and nearest neighbors searching. In the SRT, we extract the local feature for each point cell. While in the LRT, we build the global dependency among all of the point cells in the whole point cloud. Experiments on several standard benchmarks demonstrate the superiority of the HiTPR in terms of average recall rate, achieving 93.71 % at top 1 % and 86.63 % at top 1 on the Oxford RobotCar dataset for example.

KeywordPlace Recognition Loop Closure Detection Hierarchical Transformer Point Cloud
DOI10.1109/ICRA46639.2022.9811737
Scopus ID2-s2.0-85136322609
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Document TypeConference paper
CollectionDEPARTMENT OF COMPUTER AND INFORMATION SCIENCE
Faculty of Science and Technology
THE STATE KEY LABORATORY OF INTERNET OF THINGS FOR SMART CITY (UNIVERSITY OF MACAU)
Corresponding AuthorHui Kong
Affiliation1.School of Computer Science and Engineering, Nanjing University of Science and Technology, Nanjing, China
2.Department of Computer Science, University of Macau, Macau, China
3.Faculty of Science and Technology, University of Macau, Macau, China
Corresponding Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Zhixing Hou,Yan Yan,Chengzhong Xu,et al. HiTPR: Hierarchical Transformer for Place Recognition in Point Cloud[C], 2022.
APA Zhixing Hou., Yan Yan., Chengzhong Xu., & Hui Kong (2022). HiTPR: Hierarchical Transformer for Place Recognition in Point Cloud. 2022 International Conference on Robotics and Automation (ICRA).
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