Search Results for author: Liangliang Nan

Found 21 papers, 10 papers with code

First Mapping the Canopy Height of Primeval Forests in the Tallest Tree Area of Asia

no code implementations23 Apr 2024 Guangpeng Fan, Fei Yan, Xiangquan Zeng, Qingtao Xu, Ruoyoulan Wang, Binghong Zhang, Jialing Zhou, Liangliang Nan, Jinhu Wang, Zhiwei Zhang, Jia Wang

We proposed a method to map the canopy height of the primeval forest within the world-level giant tree distribution area by using a spaceborne LiDAR fusion satellite imagery (Global Ecosystem Dynamics Investigation (GEDI), ICESat-2, and Sentinel-2) driven deep learning modeling.

On the Estimation of Image-matching Uncertainty in Visual Place Recognition

no code implementations31 Mar 2024 Mubariz Zaffar, Liangliang Nan, Julian F. P. Kooij

In Visual Place Recognition (VPR) the pose of a query image is estimated by comparing the image to a map of reference images with known reference poses.

Image Retrieval Retrieval +1

PointeNet: A Lightweight Framework for Effective and Efficient Point Cloud Analysis

no code implementations20 Dec 2023 Lipeng Gu, Xuefeng Yan, Liangliang Nan, Dingkun Zhu, Honghua Chen, Weiming Wang, Mingqiang Wei

The DSE module, designed for real-world autonomous driving scenarios, enhances the semantic perception of point clouds, particularly for distant points.

3D Object Detection Autonomous Driving +2

Cross-BERT for Point Cloud Pretraining

no code implementations8 Dec 2023 Xin Li, Peng Li, Zeyong Wei, Zhe Zhu, Mingqiang Wei, Junhui Hou, Liangliang Nan, Jing Qin, Haoran Xie, Fu Lee Wang

By performing cross-modal interaction, Cross-BERT can smoothly reconstruct the masked tokens during pretraining, leading to notable performance enhancements for downstream tasks.

Self-Supervised Learning

MuVieCAST: Multi-View Consistent Artistic Style Transfer

1 code implementation8 Dec 2023 Nail Ibrahimli, Julian F. P. Kooij, Liangliang Nan

We introduce MuVieCAST, a modular multi-view consistent style transfer network architecture that enables consistent style transfer between multiple viewpoints of the same scene.

Novel View Synthesis Style Transfer

CoPR: Towards Accurate Visual Localization With Continuous Place-descriptor Regression

no code implementations14 Apr 2023 Mubariz Zaffar, Liangliang Nan, Julian Francisco Pieter Kooij

Firstly, the reference images for VPR are only available at sparse poses in a map, which enforces an upper bound on the maximum achievable localization accuracy through VPR.

Image-Based Localization Pose Estimation +3

CSDN: Cross-modal Shape-transfer Dual-refinement Network for Point Cloud Completion

no code implementations1 Aug 2022 Zhe Zhu, Liangliang Nan, Haoran Xie, Honghua Chen, Mingqiang Wei, Jun Wang, Jing Qin

The first module transfers the intrinsic shape characteristics from single images to guide the geometry generation of the missing regions of point clouds, in which we propose IPAdaIN to embed the global features of both the image and the partial point cloud into completion.

Point Cloud Completion

DDL-MVS: Depth Discontinuity Learning for MVS Networks

1 code implementation2 Mar 2022 Nail Ibrahimli, Hugo Ledoux, Julian Kooij, Liangliang Nan

We validate our idea and demonstrate that our strategies can be easily integrated into the existing learning-based MVS pipeline where the reconstruction depends on high-quality depth map estimation.

PSSNet: Planarity-sensible Semantic Segmentation of Large-scale Urban Meshes

1 code implementation7 Feb 2022 Weixiao Gao, Liangliang Nan, Bas Boom, Hugo Ledoux

The over-segmentation step generates an initial set of mesh segments that capture the planar and non-planar regions of urban scenes.

Segmentation Semantic Segmentation

HRBF-Fusion: Accurate 3D reconstruction from RGB-D data using on-the-fly implicits

1 code implementation3 Feb 2022 Yabin Xu, Liangliang Nan, Laishui Zhou, Jun Wang, Charlie C. L. Wang

However, due to the discrete nature and limited resolution of their surface representations (e. g., point- or voxel-based), existing approaches suffer from the accumulation of errors in camera tracking and distortion in the reconstruction, which leads to an unsatisfactory 3D reconstruction.

3D Reconstruction

City3D: Large-Scale Building Reconstruction from Airborne LiDAR Point Clouds

1 code implementation25 Jan 2022 Jin Huang, Jantien Stoter, Ravi Peters, Liangliang Nan

A major challenge of urban reconstruction from airborne LiDAR point clouds lies in that the vertical walls are typically missing.

Surface Reconstruction

Reconstructing Compact Building Models from Point Clouds Using Deep Implicit Fields

1 code implementation24 Dec 2021 Zhaiyu Chen, Hugo Ledoux, Seyran Khademi, Liangliang Nan

While three-dimensional (3D) building models play an increasingly pivotal role in many real-world applications, obtaining a compact representation of buildings remains an open problem.

Combinatorial Optimization Computational Efficiency

3D Instance Segmentation of MVS Buildings

no code implementations18 Dec 2021 Jiazhou Chen, Yanghui Xu, Shufang Lu, Ronghua Liang, Liangliang Nan

Based on these global masks, 3D roof instances are segmented out by mask back-projections and extended to the entire building instances through a Markov random field optimization.

3D Instance Segmentation Segmentation +1

SUM: A Benchmark Dataset of Semantic Urban Meshes

2 code implementations27 Feb 2021 Weixiao Gao, Liangliang Nan, Bas Boom, Hugo Ledoux

The contributions of this work are threefold: (1) a new benchmark dataset of semantic urban meshes, (2) a novel semi-automatic annotation framework, and (3) an annotation tool for 3D meshes.

3D Semantic Segmentation Segmentation

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