Search Results for author: Fu Zhang

Found 17 papers, 11 papers with code

P-NAL: an Effective and Interpretable Entity Alignment Method

no code implementations18 Apr 2024 Chuanhao Xu, Jingwei Cheng, Fu Zhang

In this paper, we introduce P-NAL, an entity alignment method that captures two types of logical inference paths with Non-Axiomatic Logic (NAL).

Attribute Entity Alignment +2

An Efficient Plane Extraction Approach for Bundle Adjustment on LiDAR Point clouds

no code implementations29 Apr 2023 Zheng Liu, Fu Zhang

However, the accuracy and speed of LiDAR bundle adjustment depend on the quality of plane extraction, which provides point association for LiDAR BA.

ImMesh: An Immediate LiDAR Localization and Meshing Framework

1 code implementation12 Jan 2023 Jiarong Lin, Chongjiang Yuan, Yixi Cai, Haotian Li, Yunfan Ren, Yuying Zou, Xiaoping Hong, Fu Zhang

This voxel-wise meshing operation is delicately designed for the purpose of efficiency; it first performs a dimension reduction by projecting 3D points to a 2D local plane contained in the voxel, and then executes the meshing operation with pull, commit and push steps for incremental reconstruction of triangle facets.

Dimensionality Reduction

STD: Stable Triangle Descriptor for 3D place recognition

1 code implementation26 Sep 2022 Chongjian Yuan, Jiarong Lin, Zuhao Zou, Xiaoping Hong, Fu Zhang

For a triangle, its shape is uniquely determined by the length of the sides or included angles.

3D Place Recognition

R$^3$LIVE++: A Robust, Real-time, Radiance reconstruction package with a tightly-coupled LiDAR-Inertial-Visual state Estimator

1 code implementation8 Sep 2022 Jiarong Lin, Fu Zhang

The LIO subsystem utilizes the measurements from a LiDAR for reconstructing the geometric structure (i. e., the positions of 3D points), while the VIO subsystem simultaneously recovers the radiance information of the geometric structure from the input images.

Self-Driving Cars Simultaneous Localization and Mapping

R3LIVE: A Robust, Real-time, RGB-colored, LiDAR-Inertial-Visual tightly-coupled state Estimation and mapping package

3 code implementations10 Sep 2021 Jiarong Lin, Fu Zhang

Moreover, to make R3LIVE more extensible, we develop a series of offline utilities for reconstructing and texturing meshes, which further minimizes the gap between R3LIVE and various of 3D applications such as simulators, video games and etc (see our demos video).

Sensor Fusion

R2LIVE: A Robust, Real-time, LiDAR-Inertial-Visual tightly-coupled state Estimator and mapping

1 code implementation24 Feb 2021 Jiarong Lin, Chunran Zheng, Wei Xu, Fu Zhang

Our proposed framework is composed of two parts: the filter-based odometry and factor graph optimization.

Robotics

FAST-LIO: A Fast, Robust LiDAR-inertial Odometry Package by Tightly-Coupled Iterated Kalman Filter

3 code implementations16 Oct 2020 Wei Xu, Fu Zhang

To lower the computation load in the presence of large number of measurements, we present a new formula to compute the Kalman gain.

Robotics

BALM: Bundle Adjustment for Lidar Mapping

1 code implementation16 Oct 2020 Zheng Liu, Fu Zhang

We propose a framework for bundle adjustment (BA) on sparse lidar points and incorporate it to a lidar odometry and mapping (LOAM) to lower the drift.

Robotics

Robots State Estimation and Observability Analysis Based on Statistical Motion Models

no code implementations12 Oct 2020 Wei Xu, Dongjiao He, Yixi Cai, Fu Zhang

It is shown that this new paradigm is much simpler and more natural than existing methods based on quaternion parameterizations.

POS Translation

A decentralized framework for simultaneous calibration, localization and mapping with multiple LiDARs

1 code implementation3 Jul 2020 Jiarong Lin, Xiyuan Liu, Fu Zhang

To improve the system robustness and performance in self-localization and mapping, we develop a decentralized framework for simultaneous calibration, localization and mapping with multiple LiDARs.

Robotics

Consolidating Commonsense Knowledge

no code implementations10 Jun 2020 Filip Ilievski, Pedro Szekely, Jingwei Cheng, Fu Zhang, Ehsan Qasemi

Commonsense reasoning is an important aspect of building robust AI systems and is receiving significant attention in the natural language understanding, computer vision, and knowledge graphs communities.

Common Sense Reasoning Knowledge Graphs +1

A fast, complete, point cloud based loop closure for LiDAR odometry and mapping

2 code implementations25 Sep 2019 Jiarong Lin, Fu Zhang

This paper presents a loop closure method to correct the long-term drift in LiDAR odometry and mapping (LOAM).

Loam_livox: A fast, robust, high-precision LiDAR odometry and mapping package for LiDARs of small FoV

2 code implementations15 Sep 2019 Jiarong Lin, Fu Zhang

LiDAR odometry and mapping (LOAM) has been playing an important role in autonomous vehicles, due to its ability to simultaneously localize the robot's pose and build high-precision, high-resolution maps of the surrounding environment.

Autonomous Navigation

Acceleration Based Iterative Learning Control for Pugachev's Cobra Maneuver with Quadrotor Tail-sitter VTOL UAVs

no code implementations6 Jun 2019 Wei Xu, Haowei Gu, Fu Zhang

Both the feedback controller and the iterative learning feed-forward controller are based on the aircraft acceleration model, which is directly measurable by the onboard accelerometer.

Systems and Control

Flying through a narrow gap using neural network: an end-to-end planning and control approach

1 code implementation21 Mar 2019 Jiarong Lin, Luqi Wang, Fei Gao, Shaojie Shen, Fu Zhang

To this end, we propose an end-to-end policy network, which imitates from the traditional pipeline and is fine-tuned using reinforcement learning.

Robotics

Detecting facial landmarks in the video based on a hybrid framework

no code implementations21 Sep 2016 Nian Cai, Zhineng Lin, Fu Zhang, Guandong Cen, Han Wang

Finally, the facial landmarks in the current frame are exactly detected from the validated face bounding box via the landmark detector.

Face Detection

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