arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2407.09786cs.CV
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基于多视角对抗学习的无监督3D点云补全

Unsupervised 3D Point Cloud Completion via Multi-view Adversarial Learning

Harbin Institute of Technology, Shenzhen(哈尔滨工业大学(深圳));City University of Hong Kong(香港城市大学);Huaqiao University(华侨大学)

Lintai Wu, Xianjing Cheng, Yong Xu, Huanqiang Zeng, Junhui Hou

AI总结:

提出无监督3D点云补全框架MAL-UPC,利用区域级和类别特定几何相似性及多视角对抗学习,仅需单视角部分观测即可重建缺失结构,性能超越现有自监督方法。

摘要:

在现实场景中,由于遮挡问题,扫描得到的点云通常是不完整的。自监督和弱监督点云补全任务涉及在没有完整真值监督的情况下重建这些不完整对象的缺失区域。当前方法要么依赖部分观测的多视角进行监督,要么忽略了可以从给定部分点云中识别和利用的内在几何相似性。在本文中,我们提出了MAL-UPC框架,该框架有效利用区域级和类别特定的几何相似性来补全缺失结构。我们的MAL-UPC不需要任何3D完整监督,在训练集中仅需单视角部分观测。具体而言,我们首先引入Pattern Retrieval Network来检索部分输入和预测形状之间相似的位置和曲率模式,然后利用这些相似性对重建结果进行致密化和细化。此外,我们将重建的完整形状渲染为多视角深度图,并设计了一个对抗学习模块,从训练集中部分点云的类别特定单视角深度图像中学习目标形状的几何特征。为实现各向异性渲染,我们设计了一种密度感知半径估计算法来提高渲染图像的质量。我们的MAL-UPC优于当前最先进的自监督方法,甚至超越了一些无配对方法。我们将公开源代码。

英文摘要:

In real-world scenarios, scanned point clouds are often incomplete due to occlusion issues. The tasks of self-supervised and weakly-supervised point cloud completion involve reconstructing missing regions of these incomplete objects without the supervision of complete ground truth. Current methods either rely on multiple views of partial observations for supervision or overlook the intrinsic geometric similarity that can be identified and utilized from the given partial point clouds. In this paper, we propose MAL-UPC, a framework that effectively leverages both region-level and category-specific geometric similarities to complete missing structures. Our MAL-UPC does not require any 3D complete supervision and only necessitates single-view partial observations in the training set. Specifically, we first introduce a Pattern Retrieval Network to retrieve similar position and curvature patterns between the partial input and the predicted shape, then leverage these similarities to densify and refine the reconstructed results. Additionally, we render the reconstructed complete shape into multi-view depth maps and design an adversarial learning module to learn the geometry of the target shape from category-specific single-view depth images of the partial point clouds in the training set. To achieve anisotropic rendering, we design a density-aware radius estimation algorithm to improve the quality of the rendered images. Our MAL-UPC outperforms current state-of-the-art self-supervised methods and even some unpaired approaches. We will make the source code publicly available at https://github.com/ltwu6/malspc

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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