On-the-Fly Object-aware Representative Point Selection in Point Cloud

Xiaoyu Zhang, Ziwei Wang, Hai Dong, Zhifeng Bao, Jiajun Liu; Proceedings of the Winter Conference on Applications of Computer Vision (WACV), 2025, pp. 1713-1722

Point clouds are essential for object modeling and play a critical role in assisting driving tasks for autonomous vehicles (AVs). However the significant volume of data generated by AVs creates challenges for storage bandwidth and processing cost. To tackle these challenges we propose a representative point selection framework for point cloud downsampling which preserves critical object-related information while effectively filtering out irrelevant background points. Our method involves two steps: (1) Object Presence Detection where we introduce an unsupervised density peak-based classifier and a supervised Naive Bayes classifier to handle diverse scenarios and (2) Sampling Budget Allocation where we propose a strategy that selects object-relevant points while maintaining a high retention rate of object information. Extensive experiments on the KITTI and nuScenes datasets demonstrate that our method consistently outperforms state-of-the-art baselines in both efficiency and effectiveness across varying sampling rates. As a model-agnostic solution our approach integrates seamlessly with diverse downstream models making it a valuable and scalable addition to the 3D point cloud downsampling toolkit for AV applications.