DFPS:一个高效的低采样算法,旨在保护大规模点云数据的全球特征
Jiahui Dong1, Maoyi Tian1, Jiayong Yu2
1College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China.
Sensors (Basel, Switzerland)
|July 30, 2025
概括
本研究介绍了一种高效的3D点云下采样算法 (DFPS),可以显著加快处理速度,同时保留全球特征. DFPS为大规模3D数据提供了一个轻量级的解决方案,可适应各种设备.
科学领域:
- 计算机视觉 计算机视觉
- 3D数据处理 3D数据处理
- 计算几何学的计算几何学
背景情况:
- 大规模的3D点云数据集为处理和分析带来了重大的计算挑战.
- 现有的减量采样方法往往难以平衡效率与保护关键的全球特征.
- 越来越多的3D数据需要更高效的算法,用于诸如自动驾驶和增强现实等应用.
研究的目的:
- 引入一个高效和自适应的3D点云下采样算法 (DFPS).
- 为了证明DFPS保持全球特征的能力,同时显著提高处理速度.
- 为在资源有限的环境中提供可部署的轻量级解决方案.
主要方法:
- 开发了一个算法 (DFPS) 使用自适应的多层格子分区.
- 实现了多线程并行加速架构,以提高处理速度.
- 用于对特征保存的定量分析的法距离.
主要成果:
- 与FPS相比,在12.5%的采样率 (71.64s vs 161,665s) 实现了超过2200倍的效率改进.
- 在3.125%的采样率下,证明了近10,000倍的效率提高.
- 通过视觉和定量分析验证了全球特征信息的有效保存.
结论:
- DFPS为3D点云下采样提供了高效和有效的解决方案.
- 该算法的自适应性和并行架构使其适合大规模数据集.
- 它的GPU独立设计允许在各种设备上灵活部署,支持下游任务,如注册和细分.
相关概念视频
01:20Downsampling
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When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
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01:22Upsampling
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Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
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01:18Reducing Line Loss
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In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
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