Geometric Back-projection Network for Point Cloud Classification

28 Nov 2019  ·  Shi Qiu, Saeed Anwar, Nick Barnes ·

As the basic task of point cloud analysis, classification is fundamental but always challenging. To address some unsolved problems of existing methods, we propose a network that captures geometric features of point clouds for better representations. To achieve this, on the one hand, we enrich the geometric information of points in low-level 3D space explicitly. On the other hand, we apply CNN-based structures in high-level feature spaces to learn local geometric context implicitly. Specifically, we leverage an idea of error-correcting feedback structure to capture the local features of point clouds comprehensively. Furthermore, an attention module based on channel affinity assists the feature map to avoid possible redundancy by emphasizing its distinct channels. The performance on both synthetic and real-world point clouds datasets demonstrate the superiority and applicability of our network. Comparing with other state-of-the-art methods, our approach balances accuracy and efficiency.

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Task Dataset Model Metric Name Metric Value Global Rank Result Benchmark
3D Point Cloud Classification ModelNet40 GBNet Overall Accuracy 93.8 # 29
Mean Accuracy 91.0 # 20
3D Point Cloud Classification ScanObjectNN GBNet Overall Accuracy 80.5 # 48
Mean Accuracy 77.8 # 23


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