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RFNet-4D++:基于交叉注意力时空特征的4D点云联合物体重建与光流估计

RFNet-4D++: Joint Object Reconstruction and Flow Estimation from 4D Point Clouds with Cross-Attention Spatio-Temporal Features

The Hong Kong University of Science and Technology(香港科技大学);Deakin University(迪肯大学);Trinity College Dublin(都柏林圣三一学院);Woven by Toyota(丰田Woven公司)

Tuan-Anh Vu, Duc Thanh Nguyen, Binh-Son Hua, Quang-Hieu Pham, Sai-Kit Yeung

AI总结:

本文提出RFNet-4D++网络,通过交叉注意力时空特征联合学习4D点云的物体重建与光流估计,实现最先进性能且训练推理更快。

摘要:

从3D点云进行物体重建一直是计算机视觉和计算机图形学中长期研究的问题,并已取得显著进展。然而,从时变点云(即4D点云)进行重建通常被忽视。在本文中,我们提出了一种新的网络架构,即RFNet-4D++,该架构从4D点云中联合重建物体及其运动流。关键见解在于,通过从点云序列中学习空间和时间特征同时执行这两项任务,可以利用单个任务的优势,从而提升整体性能。为了证明这一能力,我们设计了一个时间向量场学习模块,采用无监督学习方法进行光流估计任务,并借助空间结构的监督学习来辅助物体重建。在基准数据集上的大量实验和分析验证了我们方法的有效性和效率。实验结果表明,我们的方法在光流估计和物体重建方面均达到了最先进的性能,并且在训练和推理方面都比现有方法快得多。我们的代码和数据可在https://github.com/hkust-vgd/RFNet-4D获取。

英文摘要:

Object reconstruction from 3D point clouds has been a long-standing research problem in computer vision and computer graphics, and achieved impressive progress. However, reconstruction from time-varying point clouds (a.k.a. 4D point clouds) is generally overlooked. In this paper, we propose a new network architecture, namely RFNet-4D++, that jointly reconstructs objects and their motion flows from 4D point clouds. The key insight is simultaneously performing both tasks via learning of spatial and temporal features from a sequence of point clouds can leverage individual tasks, leading to improved overall performance. To prove this ability, we design a temporal vector field learning module using an unsupervised learning approach for flow estimation task, leveraged by supervised learning of spatial structures for object reconstruction. Extensive experiments and analyses on benchmark datasets validated the effectiveness and efficiency of our method. As shown in experimental results, our method achieves state-of-the-art performance on both flow estimation and object reconstruction while performing much faster than existing methods in both training and inference. Our code and data are available at https://github.com/hkust-vgd/RFNet-4D

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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