SMCNet: State-Space Model for Enhanced Corruption Robustness in 3D Classification

Accurate classification of three-dimensional (3D) point clouds in real-world environments is often impeded by sensor noise, occlusions, and incomplete data. To overcome these challenges, we propose SMCNet, a robust multimodal framework for 3D point cloud classification. SMCNet combines multi-view projection and neural radiance fields (NeRFs) to generate high-fidelity 2D representations with enhanced texture realism, addressing occlusions and lighting inconsistencies effectively. The Mamba model is further refined within this framework by integrating a depth perception module to capture long-range point interactions and adopting a dual-channel structure to enhance point-wise feature extraction. Fine-tuning adapters for the CLIP and Mamba models are also introduced, significantly improving cross-domain adaptability. Additionally, an intelligent voting mechanism aggregates predictions from multiple viewpoints, ensuring enhanced classification robustness. Comprehensive experiments demonstrate that SMCNet achieves state-of-the-art performance, outperforming the PointNet++ baseline with a 0.5% improvement in mean overall accuracy (mOA) on ModelNet40 and a 7.9% improvement on ScanObjectNN. In corruption resistance, SMCNet reduces the mean corruption error (mCE) by 0.8% on ModelNet40-C and 3.6% on ScanObjectNN-C. These results highlight the effectiveness of SMCNet in tackling real-world classification scenarios with noisy and corrupted data.