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1.兰州交通大学测绘与地理信息学院,甘肃 兰州,730070
2.地理国情监测技术应用国家地方联合工程研究中心,甘肃 兰州,730070
3.甘肃省地理国情监测工程实验室,甘肃 兰州,730070
Received:08 September 2024,
Published:05 December 2025
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马天恩,刘涛,杜萍,等.一种聚合全局上下文信息的三维点云语义分割方法[J].武汉大学学报(信息科学版),2025,50(12):2548-2559.
MA Tianen,LIU Tao,DU Ping,et al.A 3D Point Cloud Semantic Segmentation Method for Aggregating Global Context Information[J].Geomatics and Information Science of Wuhan University,2025,50(12):2548-2559.
马天恩,刘涛,杜萍,等.一种聚合全局上下文信息的三维点云语义分割方法[J].武汉大学学报(信息科学版),2025,50(12):2548-2559. DOI:10.13203/j.whugis20230143
MA Tianen,LIU Tao,DU Ping,et al.A 3D Point Cloud Semantic Segmentation Method for Aggregating Global Context Information[J].Geomatics and Information Science of Wuhan University,2025,50(12):2548-2559. DOI:10.13203/j.whugis20230143
现有基于深度学习的三维点云语义分割方法在很大程度上忽略了全局上下文信息,未能充分利用点云的局部几何结构、颜色信息和高层语义特征之间的互补性。针对该问题,提出一种融合局部特征编码和密集连接的点云语义分割模型。首先,设计一个局部特征提取模块,使模型能够同时捕获空间几何结构、颜色信息和语义特征;然后,结合局部特征聚合模块保留原始点云数据中丰富的几何信息,减少特征提取过程中几何信息的损失;最后,利用密集连接模块聚合全局上下文信息,实现低层特征和高层语义信息的互补。采用S3DIS和Semantic3D两个大型基准数据集进行实验验证,发现所提模型在两个数据集上的平均交并比分别达到71.8%和77.8%。实验结果表明,所提模型在三维点云语义分割方面具有较好的性能。
Objectives
2
The deep learning-based 3D point cloud semantic segmentation methods often overlook global contextual information and do not fully leverage the synergy between the local geometric structure
color information
and high-level semantic features of point cloud. It is essential to effectively capture the geometric structure
color variations
and semantic features of point clouds while retaining global context information.
Methods
2
This paper proposes a point cloud semantic segmentation model that integrates local feature encoding and dense connectivity. First
a local feature extraction module is employed to enable the model to concurrently capture spatial geometric structure
color information
and semantic features. Second
a local feature aggregation module is incorporated to preserve the rich geometric data within the original point cloud
minimizing information loss during feature extraction. Finally
we utilize a dense connectivity module to aggregate contextual semantic information
and promote synergy between low-level features and high-level semantic data.
Results
2
The proposed model is benchmarked on two large datasets
S3DIS and Semantic3D. The results show that the proposed model achieves an overall accuracy (OA) of 88.3% and mean intersection over union (mIoU) of 71.8% on S3DIS dataset
improving the baseline set of RandLA-Net by 0.3% and 1.8%
respectively. On Semantic3D dataset
we register an OA of 94.9% and an mIoU of 77.8%
marking respective improvements of 0.1% and 0.4% over RandLA-Net.
Conclusions
2
The proposed model effectively preserves local geometric and color information through local feature encoding. The local feature aggregation module refines point proximity along boundaries to align with similar feature domains
and dense connections successfully integrate global context and key geometric features. Overall
the proposed model delivers more accurate semantic labels and a superior geometric feature representation
enhancing the precision of local segmentations.
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