Search Results for author: Lihua Xie

Found 69 papers, 21 papers with code

Salient Sparse Visual Odometry With Pose-Only Supervision

no code implementations6 Apr 2024 Siyu Chen, Kangcheng Liu, Chen Wang, Shenghai Yuan, Jianfei Yang, Lihua Xie

Visual Odometry (VO) is vital for the navigation of autonomous systems, providing accurate position and orientation estimates at reasonable costs.

Optical Flow Estimation Visual Odometry

Diffusion Model is a Good Pose Estimator from 3D RF-Vision

no code implementations24 Mar 2024 Junqiao Fan, Jianfei Yang, Yuecong Xu, Lihua Xie

However, the mmWave radar has a limited resolution with severe noise, leading to inaccurate and inconsistent human pose estimation.

Pose Estimation

Reliable Spatial-Temporal Voxels For Multi-Modal Test-Time Adaptation

no code implementations11 Mar 2024 Haozhi Cao, Yuecong Xu, Jianfei Yang, Pengyu Yin, Xingyu Ji, Shenghai Yuan, Lihua Xie

Multi-modal test-time adaptation (MM-TTA) is proposed to adapt models to an unlabeled target domain by leveraging the complementary multi-modal inputs in an online manner.

Test-time Adaptation

PSS-BA: LiDAR Bundle Adjustment with Progressive Spatial Smoothing

no code implementations10 Mar 2024 Jianping Li, Thien-Minh Nguyen, Shenghai Yuan, Lihua Xie

The proposed method consists of a spatial smoothing module and a pose adjustment module, which combines the benefits of local consistency and global accuracy.

Point cloud reconstruction Point Cloud Registration

K-Link: Knowledge-Link Graph from LLMs for Enhanced Representation Learning in Multivariate Time-Series Data

no code implementations6 Mar 2024 Yucheng Wang, Ruibing Jin, Min Wu, XiaoLi Li, Lihua Xie, Zhenghua Chen

To capture these dependencies, Graph Neural Networks (GNNs) have emerged as powerful tools, yet their effectiveness is restricted by the quality of graph construction from MTS data.

General Knowledge graph construction +2

MaskFi: Unsupervised Learning of WiFi and Vision Representations for Multimodal Human Activity Recognition

no code implementations29 Feb 2024 Jianfei Yang, Shijie Tang, Yuecong Xu, Yunjiao Zhou, Lihua Xie

Benefiting from our unsupervised learning procedure, the network requires only a small amount of annotated data for finetuning and can adapt to the new environment with better performance.

Human Activity Recognition Representation Learning

MMAUD: A Comprehensive Multi-Modal Anti-UAV Dataset for Modern Miniature Drone Threats

1 code implementation6 Feb 2024 Shenghai Yuan, Yizhuo Yang, Thien Hoang Nguyen, Thien-Minh Nguyen, Jianfei Yang, Fen Liu, Jianping Li, Han Wang, Lihua Xie

In response to the evolving challenges posed by small unmanned aerial vehicles (UAVs), which possess the potential to transport harmful payloads or independently cause damage, we introduce MMAUD: a comprehensive Multi-Modal Anti-UAV Dataset.

UP-CrackNet: Unsupervised Pixel-Wise Road Crack Detection via Adversarial Image Restoration

no code implementations28 Jan 2024 Nachuan Ma, Rui Fan, Lihua Xie

Subsequently, a generative adversarial network is trained to restore the corrupted regions by leveraging the semantic context learned from surrounding uncorrupted regions.

Crack Segmentation Generative Adversarial Network +2

Angle-Displacement Rigidity Theory with Application to Distributed Network Localization

no code implementations19 Dec 2023 Xu Fang, Xiaolei Li, Lihua Xie

This paper investigates the localization problem of a network in 2-D and 3-D spaces given the positions of anchor nodes in a global frame and inter-node relative measurements in local coordinate frames.

Position

Distributed Semi-global Output Feedback Formation Maneuver Control of High-order Multi-agent Systems

no code implementations19 Dec 2023 Xu Fang, Lihua Xie

Compared with existing relative-measurement-based formation maneuver control, the advantages of the proposed method are that it is output (relative output) feedback based and shows how to realize different types of formation shape.

Distributed Localization in Dynamic Networks via Complex Laplacian

no code implementations18 Dec 2023 Xu Fang, Lihua Xie, Xiaolei Li

Different from most existing distributed localization approaches in static networks where the agents in a network are static, this paper addresses the distributed localization problem in dynamic networks where the positions of the agents are time-varying.

3-D Distributed Localization with Mixed Local Relative Measurements

no code implementations18 Dec 2023 Xu Fang, Xiaolei Li, Lihua Xie

Each node holds a local coordinate frame without a common orientation and can only measure one type of information (relative position, distance, relative bearing, angle, or ratio-of-distance measurements) about its neighboring nodes in its local coordinate frame.

Position

Distributed Formation Maneuver Control Using Complex Laplacian

no code implementations7 Dec 2023 Xu Fang, Lihua Xie

The third advantage is that more formation shapes can be realized by only tuning the positions of the leaders.

TENT: Connect Language Models with IoT Sensors for Zero-Shot Activity Recognition

no code implementations14 Nov 2023 Yunjiao Zhou, Jianfei Yang, Han Zou, Lihua Xie

Through the IoT-language contrastive learning, we derive a unified semantic feature space that aligns multi-modal features with language embeddings, so that the IoT data corresponds to specific words that describe the IoT data.

Contrastive Learning Human Activity Recognition

Integrated Relative-Measurement-Based Network Localization and Formation Maneuver Control (Extended Version)

no code implementations28 Oct 2023 Xu Fang, Lihua Xie, Xiaolei Li

This paper studies the problem of integrated distributed network localization and formation maneuver control.

Translation

AdaPose: Towards Cross-Site Device-Free Human Pose Estimation with Commodity WiFi

no code implementations29 Sep 2023 Yunjiao Zhou, Jianfei Yang, He Huang, Lihua Xie

The results demonstrate the effectiveness and robustness of AdaPose in eliminating domain shift, thereby facilitating the widespread application of WiFi-based pose estimation in smart cities.

Domain Adaptation Pose Estimation

Fully-Connected Spatial-Temporal Graph for Multivariate Time-Series Data

1 code implementation11 Sep 2023 Yucheng Wang, Yuecong Xu, Jianfei Yang, Min Wu, XiaoLi Li, Lihua Xie, Zhenghua Chen

For graph construction, we design a decay graph to connect sensors across all timestamps based on their temporal distances, enabling us to fully model the ST dependencies by considering the correlations between DEDT.

graph construction Time Series

Graph-Aware Contrasting for Multivariate Time-Series Classification

1 code implementation11 Sep 2023 Yucheng Wang, Yuecong Xu, Jianfei Yang, Min Wu, XiaoLi Li, Lihua Xie, Zhenghua Chen

As MTS data typically originate from multiple sensors, ensuring spatial consistency becomes essential for the overall performance of contrastive learning on MTS data.

Classification Contrastive Learning +3

Quantized distributed Nash equilibrium seeking under DoS attacks: A quantized consensus based approach

no code implementations24 Aug 2023 Shuai Feng, Maojiao Ye, Lihua Xie, Shengyuan Xu

To solve the quantizer saturation problem caused by DoS attacks, the quantization mechanism is equipped to have zooming-in and holding capabilities, in which the holding capability is consistent with the results in quantized consensus under DoS.

Quantization

Data-driven Polytopic Output Synchronization of Heterogeneous Multi-agent Systems from Noisy Data

no code implementations14 Jul 2023 Yifei Li, Wenjie Liu, Jian Sun, Gang Wang, Lihua Xie, Jie Chen

This method utilizes measured data and a noise-matrix polytope to ensure near-optimal output synchronization.

Distributed Online Convex Optimization with Adversarial Constraints: Reduced Cumulative Constraint Violation Bounds under Slater's Condition

no code implementations31 May 2023 Xinlei Yi, Xiuxian Li, Tao Yang, Lihua Xie, Yiguang Hong, Tianyou Chai, Karl H. Johansson

Moreover, if the loss functions are strongly convex, then the network regret bound is reduced to $\mathcal{O}(\log(T))$, and the network cumulative constraint violation bound is reduced to $\mathcal{O}(\sqrt{\log(T)T})$ and $\mathcal{O}(\log(T))$ without and with Slater's condition, respectively.

Can We Evaluate Domain Adaptation Models Without Target-Domain Labels?

no code implementations30 May 2023 Jianfei Yang, Hanjie Qian, Yuecong Xu, Kai Wang, Lihua Xie

Unsupervised domain adaptation (UDA) involves adapting a model trained on a label-rich source domain to an unlabeled target domain.

Unsupervised Domain Adaptation

Video Unsupervised Domain Adaptation with Deep Learning: A Comprehensive Survey

no code implementations17 Nov 2022 Yuecong Xu, Haozhi Cao, Zhenghua Chen, XiaoLi Li, Lihua Xie, Jianfei Yang

To tackle performance degradation and address concerns in high video annotation cost uniformly, the video unsupervised domain adaptation (VUDA) is introduced to adapt video models from the labeled source domain to the unlabeled target domain by alleviating video domain shift, improving the generalizability and portability of video models.

Action Recognition Unsupervised Domain Adaptation

AirFi: Empowering WiFi-based Passive Human Gesture Recognition to Unseen Environment via Domain Generalization

no code implementations21 Sep 2022 Dazhuo Wang, Jianfei Yang, Wei Cui, Lihua Xie, Sumei Sun

The AirFi is a novel domain generalization framework that learns the critical part of CSI regardless of different environments and generalizes the model to unseen scenarios, which does not require collecting any data for adaptation to the new environment.

Domain Generalization Few-Shot Learning +1

GaitFi: Robust Device-Free Human Identification via WiFi and Vision Multimodal Learning

1 code implementation30 Aug 2022 Lang Deng, Jianfei Yang, Shenghai Yuan, Han Zou, Chris Xiaoxuan Lu, Lihua Xie

As an important biomarker for human identification, human gait can be collected at a distance by passive sensors without subject cooperation, which plays an essential role in crime prevention, security detection and other human identification applications.

Gait Recognition Retrieval

MetaFi: Device-Free Pose Estimation via Commodity WiFi for Metaverse Avatar Simulation

no code implementations22 Aug 2022 Jianfei Yang, Yunjiao Zhou, He Huang, Han Zou, Lihua Xie

Avatar refers to a representative of a physical user in the virtual world that can engage in different activities and interact with other objects in metaverse.

Pose Estimation

Leveraging Endo- and Exo-Temporal Regularization for Black-box Video Domain Adaptation

no code implementations10 Aug 2022 Yuecong Xu, Jianfei Yang, Haozhi Cao, Min Wu, XiaoLi Li, Lihua Xie, Zhenghua Chen

To enable video models to be applied seamlessly across video tasks in different environments, various Video Unsupervised Domain Adaptation (VUDA) methods have been proposed to improve the robustness and transferability of video models.

Action Recognition Unsupervised Domain Adaptation

Quantized Consensus under Data-Rate Constraints and DoS Attacks: A Zooming-In and Holding Approach

no code implementations18 Jul 2022 Maopeng Ran, Shuai Feng, Juncheng Li, Lihua Xie

This paper is concerned with the quantized consensus problem for uncertain nonlinear multi-agent systems under data-rate constraints and Denial-of-Service (DoS) attacks.

Quantization

Divide to Adapt: Mitigating Confirmation Bias for Domain Adaptation of Black-Box Predictors

1 code implementation28 May 2022 Jianfei Yang, Xiangyu Peng, Kai Wang, Zheng Zhu, Jiashi Feng, Lihua Xie, Yang You

Domain Adaptation of Black-box Predictors (DABP) aims to learn a model on an unlabeled target domain supervised by a black-box predictor trained on a source domain.

Domain Adaptation Knowledge Distillation

A Survey on Distributed Online Optimization and Game

no code implementations1 May 2022 Xiuxian Li, Lihua Xie, Na Li

And the local cost function of each agent is often time-varying in dynamic and even adversarial environments.

AutoFi: Towards Automatic WiFi Human Sensing via Geometric Self-Supervised Learning

1 code implementation12 Apr 2022 Jianfei Yang, Xinyan Chen, Han Zou, Dazhuo Wang, Lihua Xie

The AutoFi transfers knowledge from randomly collected CSI samples into human gait recognition and achieves state-of-the-art performance.

Activity Recognition Domain Adaptation +4

EfficientFi: Towards Large-Scale Lightweight WiFi Sensing via CSI Compression

no code implementations8 Apr 2022 Jianfei Yang, Xinyan Chen, Han Zou, Dazhuo Wang, Qianwen Xu, Lihua Xie

WiFi technology has been applied to various places due to the increasing requirement of high-speed Internet access.

Cloud Computing Edge-computing +2

SecureSense: Defending Adversarial Attack for Secure Device-Free Human Activity Recognition

no code implementations4 Apr 2022 Jianfei Yang, Han Zou, Lihua Xie

The results validate that our method works well on wireless human activity recognition and person identification systems.

Adversarial Attack Human Activity Recognition +1

Distributed stochastic proximal algorithm with random reshuffling for non-smooth finite-sum optimization

no code implementations6 Nov 2021 Xia Jiang, Xianlin Zeng, Jian Sun, Jie Chen, Lihua Xie

We prove that local variable estimates generated by the proposed algorithm achieve consensus and are attracted to a neighborhood of the optimal solution in expectation with an $\mathcal{O}(\frac{1}{T}+\frac{1}{\sqrt{T}})$ convergence rate, where $T$ is the total number of iterations.

Self-Supervised Video Representation Learning by Video Incoherence Detection

no code implementations26 Sep 2021 Haozhi Cao, Yuecong Xu, Jianfei Yang, Kezhi Mao, Lihua Xie, Jianxiong Yin, Simon See

This paper introduces a novel self-supervised method that leverages incoherence detection for video representation learning.

Action Recognition Contrastive Learning +3

Regret and Cumulative Constraint Violation Analysis for Online Convex Optimization with Long Term Constraints

no code implementations9 Jun 2021 Xinlei Yi, Xiuxian Li, Tao Yang, Lihua Xie, Tianyou Chai, Karl H. Johansson

A novel algorithm is first proposed and it achieves an $\mathcal{O}(T^{\max\{c, 1-c\}})$ bound for static regret and an $\mathcal{O}(T^{(1-c)/2})$ bound for cumulative constraint violation, where $c\in(0, 1)$ is a user-defined trade-off parameter, and thus has improved performance compared with existing results.

Innovation Compression for Communication-efficient Distributed Optimization with Linear Convergence

no code implementations14 May 2021 JiaQi Zhang, Keyou You, Lihua Xie

Information compression is essential to reduce communication cost in distributed optimization over peer-to-peer networks.

Distributed Optimization

Regret and Cumulative Constraint Violation Analysis for Distributed Online Constrained Convex Optimization

no code implementations1 May 2021 Xinlei Yi, Xiuxian Li, Tao Yang, Lihua Xie, Tianyou Chai, Karl H. Johansson

This is a sequential decision making problem with two sequences of arbitrarily varying convex loss and constraint functions.

Decision Making

Practical Output Consensus of Nonlinear Heterogeneous Multi-Agent Systems with Limited Data Rate

no code implementations27 Apr 2021 Maopeng Ran, Lihua Xie

This paper investigates the consensus problem for nonlinear heterogeneous multi-agent systems with limited communication data rate.

Vision Based Autonomous UAV Plane Estimation And Following for Building Inspection

no code implementations2 Feb 2021 Yang Lyu, Muqing Cao, Shenghai Yuan, Lihua Xie

Unmanned Aerial Vehicle (UAV) has already demonstrated its potential in many civilian applications, and the fa\c{c}ade inspection is among the most promising ones.

Pose Estimation Robotics Systems and Control Systems and Control

Robust Output Regulation and Reinforcement Learning-based Output Tracking Design for Unknown Linear Discrete-Time Systems

no code implementations21 Jan 2021 Ci Chen, Lihua Xie, Yi Jiang, Kan Xie, Shengli Xie

To remove such a requirement, an off-policy reinforcement learning algorithm is proposed using only the measured output data along the trajectories of the system and the reference output.

Dynamical Systems

VIRAL-Fusion: A Visual-Inertial-Ranging-Lidar Sensor Fusion Approach

no code implementations23 Oct 2020 Thien-Minh Nguyen, Shenghai Yuan, Muqing Cao, Yang Lyu, Thien Hoang Nguyen, Lihua Xie

However, some issues such as estimation drift and feature-dependence still remain inherent limitations.

Robotics Systems and Control Systems and Control

Online Visual Place Recognition via Saliency Re-identification

1 code implementation29 Jul 2020 Han Wang, Chen Wang, Lihua Xie

As an essential component of visual simultaneous localization and mapping (SLAM), place recognition is crucial for robot navigation and autonomous driving.

Autonomous Driving Robot Navigation +3

Towards Stable and Comprehensive Domain Alignment: Max-Margin Domain-Adversarial Training

no code implementations ICLR 2020 Jianfei Yang, Han Zou, Yuxun Zhou, Lihua Xie

The proposed MDAT stabilizes the gradient reversing in ARN by replacing the domain classifier with a reconstruction network, and in this manner ARN conducts both feature-level and pixel-level domain alignment without involving extra network structures.

Domain Adaptation Model Selection

Multi-Path Region Mining For Weakly Supervised 3D Semantic Segmentation on Point Clouds

1 code implementation CVPR 2020 Jiacheng Wei, Guosheng Lin, Kim-Hui Yap, Tzu-Yi Hung, Lihua Xie

To the best of our knowledge, this is the first method that uses cloud-level weak labels on raw 3D space to train a point cloud semantic segmentation network.

3D Semantic Segmentation Point Cloud Segmentation +2

Intensity Scan Context: Coding Intensity and Geometry Relations for Loop Closure Detection

1 code implementation12 Mar 2020 Han Wang, Chen Wang, Lihua Xie

Loop closure detection is an essential and challenging problem in simultaneous localization and mapping (SLAM).

Loop Closure Detection Retrieval +1

Fast Loop Closure Detection via Binary Content

no code implementations25 Feb 2020 Han Wang, Juncheng Li, Maopeng Ran, Lihua Xie

Our method is compared with the state-of-the-art loop closure detection methods and the results show that it outperforms the traditional methods at both recall rate and speed.

Image Retrieval Loop Closure Detection +2

Coordinate-free Circumnavigation of a Moving Target via a PD-like Controller

no code implementations16 Feb 2020 Fei Dong, Keyou You, Lihua Xie, Qinglei Hu

This paper proposes a coordinate-free controller for a nonholonomic vehicle to circumnavigate a fully-actuated moving target by using range-only measurements.

Cooperative Pursuit with Multi-Pursuer and One Faster Free-moving Evader

1 code implementation IEEE Transactions on Cybernetics 2020 Xu Fang, Chen Wang, Lihua Xie, Jie Chen

When the faster evader is allowed to move freely without any constraint, the main issues are how to form an encirclement to trap the evader into the capture domain, how to balance between forming an encirclement and approaching the faster evader, and what conditions make the capture possible.

Systems and Control Systems and Control

Kervolutional Neural Networks

6 code implementations CVPR 2019 Chen Wang, Jianfei Yang, Lihua Xie, Junsong Yuan

Convolutional neural networks (CNNs) have enabled the state-of-the-art performance in many computer vision tasks.

Distributed Online Convex Optimization with Time-Varying Coupled Inequality Constraints

no code implementations6 Mar 2019 Xinlei Yi, Xiuxian Li, Lihua Xie, Karl H. Johansson

Assuming Slater's condition, we show that the algorithm achieves smaller bounds on the constraint violation.

Model-free Approach for Sensor Network Localization with Noisy Distance Measurement

1 code implementation18 Nov 2018 Xu Fang, Chen Wang, Thien-Minh Nguyen, Lihua Xie

In addition, different from the traditional filter-based localization methods which need kinetic model for localization, our proposed method is model-free and converts the localization problem to graph optimization problem.

Graph Optimization Approach to Range-based Localization

1 code implementation28 Feb 2018 Xu Fang, Chen Wang, Thien-Minh Nguyen, Lihua Xie

In this paper, we propose a general graph optimization based framework for localization, which can accommodate different types of measurements with varying measurement time intervals.

Robotics

Non-iterative SLAM for Warehouse Robots Using Ground Textures

2 code implementations16 Oct 2017 Chen Wang, Minh-Chung Hoang, Lihua Xie, Junsong Yuan

We present a novel visual SLAM method for the warehouse robot with a single downward-facing camera using ground textures.

Robotics

Ultra-Wideband Aided Fast Localization and Mapping System

1 code implementation 2017 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS) 2017 Chen Wang, Handuo Zhang, Thien-Minh Nguyen, Lihua Xie

This paper proposes an ultra-wideband (UWB) aided localization and mapping system that leverages on inertial sensor and depth camera.

Robotics

Kernel Cross-Correlator

3 code implementations12 Sep 2017 Chen Wang, Le Zhang, Lihua Xie, Junsong Yuan

Cross-correlator plays a significant role in many visual perception tasks, such as object detection and tracking.

Human Activity Recognition object-detection +2

On Gridless Sparse Methods for Line Spectral Estimation From Complete and Incomplete Data

no code implementations9 Jul 2014 Zai Yang, Lihua Xie

This paper is concerned about sparse, continuous frequency estimation in line spectral estimation, and focused on developing gridless sparse methods which overcome grid mismatches and correspond to limiting scenarios of existing grid-based approaches, e. g., $\ell_1$ optimization and SPICE, with an infinitely dense grid.

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