Pointview-GCN: 3D Shape Classification With Multi-View Point Clouds

We address 3D shape classification with partial point cloud inputs captured from multiple viewpoints around the object. Different from existing methods that perform classification on the complete point cloud by first registering multi-view capturing, we propose PointView-GCN with multi-level Graph Convolutional Networks (GCNs) to hierarchically aggregate the shape features of single-view point clouds, in order to encode both the geometrical cues of an object and their multi-view relations. With experiments on our novel single-view datasets, we prove that PointView-GCN produces a more descriptive global shape feature which stably improves the classification accuracy by $\sim 5$% compared to the classifiers with single-view point clouds, and outperforms the state-of-the-art methods with the complete point clouds on ModelNet40.