Multispectral Airborne LiDAR Point Cloud Classification With Maximum Entropy Hierarchical Pooling

Ge Jiang;Derek D. Lichti;Tiangang Yin;Wai Yeung Yan
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Abstract

The demand for accurate airborne LiDAR point cloud classification has increased with improved resolutions of land cover map products. Although existing deep learning-based methods are capable of classifying airborne LiDAR point clouds, these methods indeed have a limited capability to extract the local features and suffer from global and local information losses with the commonly used pooling approaches. Therefore, we present a deep learning-based optimal homogeneous neighbor selection (HNS) and hierarchical pooling by exploiting maximum entropy, called MEHPool. The module is designed to directly extract sufficient homogeneous neighbor points for each point, followed by a designed graph pooling (GP) layer that encapsulates the selected homogeneous neighbor points into small-size graphs to build hierarchical features. The plug-and-play module consisting of an HNS module, two GP layers, and three graph neural networks (GNNs) can be easily embedded into various networks for point cloud classification and produces the architecture MEHPool-Net in this letter. Our experimental results show that the proposed MEHPool-Net realizes effective performance for multispectral airborne LiDAR point cloud classification, consistently outperforms four other deep learning methods, and confirms the superiority of the GP module compared with five other pooling methods.
基于最大熵分层池的多光谱机载激光雷达点云分类
随着土地覆盖图产品分辨率的提高,对精确机载激光雷达点云分类的需求也在增加。虽然现有的基于深度学习的方法能够对机载LiDAR点云进行分类,但这些方法提取局部特征的能力有限,并且与常用的池化方法相比,存在全局和局部信息损失。因此,我们提出了一种基于深度学习的最优均匀邻居选择(HNS)和利用最大熵的分层池,称为MEHPool。该模块的设计是直接为每个点提取足够的同构邻居点,然后设计一个图池(GP)层,将选择的同构邻居点封装成小尺寸的图来构建分层特征。即插即用模块由一个HNS模块、两个GP层和三个图神经网络(gnn)组成,可以很容易地嵌入到各种网络中进行点云分类,并产生本文中提到的MEHPool-Net架构。实验结果表明,所提出的MEHPool-Net在机载激光雷达多光谱点云分类中实现了有效的性能,始终优于其他四种深度学习方法,并证实了GP模块相对于其他五种池化方法的优越性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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