论文标题
NeuralQAAD:高分辨率点云压缩的有效可区分框架
NeuralQAAD: An Efficient Differentiable Framework for High Resolution Point Cloud Compression
论文作者
论文摘要
在本文中,我们提出了NeuralQaad,这是一个可快速,适用于采样且适用于高分辨率的可区分点云压缩框架。以前能够处理复杂且非平滑拓扑的工作几乎无法扩展到几千点。我们通过一种新颖的神经网络体系结构来解决该任务,其特征是重量共享和自动编码。我们的架构使用参数比以前的工作更有效,使我们更深入和可扩展。 futhermore,我们表明目前唯一可用于点云压缩,倒角距离的训练标准,对于高分辨率而言,表现较差。为了克服这个问题,我们将架构与基于二次分配问题(QAP)的新培训程序配对,我们为此陈述了两种近似算法。我们平行于梯度下降求解QAP。该程序充当替代损失,即使对于点云的$ 10^6 $点的点,也可以隐式地最大程度地减少表现力的地球越野距离(EMD)。当评估高分辨率点云上的EMD是棘手的,我们提出了基于K-d树(EM-KD)的划分和串扰方法,作为一种可扩展且快速但仍然可靠的EMD上限。在昏迷,D-Faust和头骨上证明了NeuralQaad,以视觉上和EM-KD而言,显着优于当前最新的。 Skulls是头骨CT扫描的新型数据集,我们将与NeuralQaad的实施一起公开提供。
In this paper, we propose NeuralQAAD, a differentiable point cloud compression framework that is fast, robust to sampling, and applicable to high resolutions. Previous work that is able to handle complex and non-smooth topologies is hardly scaleable to more than just a few thousand points. We tackle the task with a novel neural network architecture characterized by weight sharing and autodecoding. Our architecture uses parameters much more efficiently than previous work, allowing us to be deeper and scalable. Futhermore, we show that the currently only tractable training criterion for point cloud compression, the Chamfer distance, performances poorly for high resolutions. To overcome this issue, we pair our architecture with a new training procedure based upon a quadratic assignment problem (QAP) for which we state two approximation algorithms. We solve the QAP in parallel to gradient descent. This procedure acts as a surrogate loss and allows to implicitly minimize the more expressive Earth Movers Distance (EMD) even for point clouds with way more than $10^6$ points. As evaluating the EMD on high resolution point clouds is intractable, we propose a divide-and-conquer approach based on k-d trees, the EM-kD, as a scaleable and fast but still reliable upper bound for the EMD. NeuralQAAD is demonstrated on COMA, D-FAUST, and Skulls to significantly outperform the current state-of-the-art visually and in terms of the EM-kD. Skulls is a novel dataset of skull CT-scans which we will make publicly available together with our implementation of NeuralQAAD.