Local feature extraction network for point cloud analysis

Abstract

Geometric feature extraction of 3D point clouds plays an important role in many 3D computer vision applications such as region labeling, 3D reconstruction, object segmentation, and recog-nition. However, hand‐designed features on point clouds lack semantic information, so cannot meet these requirements. In this paper, we propose local feature extraction network (LFE‐Net) which fo-cus on extracting local feature for point clouds analysis. Such geometric features learning from a relation of local points can be used in a variety of shape analysis problems such as classification, part segmentation, and point matching. LFE‐Net consists of local geometric relation (LGR) module which aims to learn a high‐dimensional local feature to express the relation between points and their neighbors. Benefiting from the additional singular values of local points and hierarchical neural networks, the learned local features are robust to permutation and rigid transformation so that they can be transformed into 3D descriptors. Moreover, we embed prior spatial information of the local points into the sub‐features for combining features from multiple levels. LFE‐Net achieves state‐of-the‐art performances on standard benchmarks including ModelNet40, ShapeNetPart.