92 citations · 139 across the 14 of their papers we have counts for
14 papers
Voxel-SLAM: A Complete, Accurate, and Versatile LiDAR-Inertial SLAM System
Zheng Liu, Haotian Li, Chongjian Yuan +7
In this work, we present Voxel-SLAM: a complete, accurate, and versatile LiDAR-inertial SLAM system that fully utilizes short-term, mid-term, long-term, and multi-map data associat…
LVBA: LiDAR-Visual Bundle Adjustment for RGB Point Cloud Mapping
Rundong Li, Xiyuan Liu, Haotian Li +4
Point cloud maps with accurate color are crucial in robotics and mapping applications. Existing approaches for producing RGB-colorized maps are primarily based on real-time localiz…
Joint Intrinsic and Extrinsic LiDAR-Camera Calibration in Targetless Environments Using Plane-Constrained Bundle Adjustment
Liang Li, Haotian Li, Xiyuan Liu +6
This paper introduces a novel targetless method for joint intrinsic and extrinsic calibration of LiDAR-camera systems using plane-constrained bundle adjustment (BA). Our method lev…
Hierarchical Codebook Design and Analytical Beamforming Solution for IRS Assisted Communication
Xiyuan Liu, Qingqing Wu, Die Hu +2
In intelligent reflecting surface (IRS) assisted communication, beam search is usually time-consuming as the multiple-input multiple-output (MIMO) of IRS is usually very large. Hie…
An Empirical Study of Uniform-Architecture Knowledge Distillation in Document Ranking
Xubo Qin, Xiyuan Liu, Xiongfeng Zheng +2
Although BERT-based ranking models have been commonly used in commercial search engines, they are usually time-consuming for online ranking tasks. Knowledge distillation, which aim…
MARSIM: A light-weight point-realistic simulator for LiDAR-based UAVs
Fanze Kong, Xiyuan Liu, Benxu Tang +6
The emergence of low-cost, small form factor and light-weight solid-state LiDAR sensors have brought new opportunities for autonomous unmanned aerial vehicles (UAVs) by advancing n…
Large-Scale LiDAR Consistent Mapping using Hierachical LiDAR Bundle Adjustment
Xiyuan Liu, Zheng Liu, Fanze Kong +1
Reconstructing an accurate and consistent large-scale LiDAR point cloud map is crucial for robotics applications. The existing solution, pose graph optimization, though it is time-…
Efficient and Consistent Bundle Adjustment on Lidar Point Clouds
Zheng Liu, Xiyuan Liu, Fu Zhang
Bundle Adjustment (BA) refers to the problem of simultaneous determination of sensor poses and scene geometry, which is a fundamental problem in robot vision. This paper presents a…
FAST-LIVO: Fast and Tightly-coupled Sparse-Direct LiDAR-Inertial-Visual Odometry
Chunran Zheng, Qingyan Zhu, Wei Xu +3
To achieve accurate and robust pose estimation in Simultaneous Localization and Mapping (SLAM) task, multi-sensor fusion is proven to be an effective solution and thus provides gre…
Efficient and Probabilistic Adaptive Voxel Mapping for Accurate Online LiDAR Odometry
Chongjian Yuan, Wei xu, Xiyuan Liu +2
This paper proposes an efficient and probabilistic adaptive voxel mapping method for LiDAR odometry. The map is a collection of voxels; each contains one plane (or edge) feature th…
Targetless Extrinsic Calibration of Multiple Small FoV LiDARs and Cameras using Adaptive Voxelization
Xiyuan Liu, Chongjian Yuan, Fu Zhang
Determining the extrinsic parameter between multiple LiDARs and cameras is essential for autonomous robots, especially for solid-state LiDARs, where each LiDAR unit has a very smal…
Pixel-level Extrinsic Self Calibration of High Resolution LiDAR and Camera in Targetless Environments
Chongjian Yuan, Xiyuan Liu, Xiaoping Hong +1
In this letter, we present a novel method for automatic extrinsic calibration of high-resolution LiDARs and RGB cameras in targetless environments. Our approach does not require ch…
A decentralized framework for simultaneous calibration, localization and mapping with multiple LiDARs
Jiarong Lin, Xiyuan Liu, Fu Zhang
LiDAR is playing a more and more essential role in autonomous driving vehicles for objection detection, self localization and mapping. A single LiDAR frequently suffers from hardwa…
Bird Flocking Inspired Control Strategy for Multi-UAV Collective Motion
Xiyuan Liu, Li Qiu
UAV collective motion has become a hot research topic in recent years. The realization of UAV collective motion, however, relied heavily on centralized control method and suffered…