Point clouds are an increasingly relevant data type but they are often corrupted by noise. We propose a deep neural network based on graph-convolutional layers that can elegantly deal with the permutation-invariance problem encountered by learning-based point cloud processing methods. The network is fully-convolutional and can build complex hierarchies of features by dynamically constructing neighborhood graphs from similarity among the high-dimensional feature representations of the points. When coupled with a loss promoting proximity to the ideal surface, the proposed approach significantly outperforms state-of-the-art methods on a variety of metrics. In particular, it is able to improve in terms of Chamfer measure and of quality of the surface normals that can be estimated from the denoised data. We also show that it is especially robust both at high noise levels and in presence of structured noise such as the one encountered in real LiDAR scans.

本文提出一种基于图卷积层的深度神经网络，能够优雅地处理学习型点云处理方法所遇到的置换不变性问题，通过动态构建邻域图来建立特征的复杂层次结构，与促进接近理想表面的损失相结合，该方法在各种指标上都明显优于现有方法，特别是在高噪声和结构噪声等实际情况下表现尤为稳健。

学习图卷积表示用于点云去噪