论文标题
基于折叠的点云属性压缩
Folding-based compression of point cloud attributes
论文作者
论文摘要
现有的技术来压缩点云属性利用几何或基于视频的压缩工具。我们探索了一种受到点云表示学习的最新进展启发的根本不同的方法。点云可以解释为3D空间中的2D歧管。具体而言,我们使用新颖的优化映射方法将2D网格折叠到点云上,并将属性从点云映射到折叠的2D网格上。该映射导致图像,该图像打开了一种在点云属性上应用现有图像处理技术的方法。但是,由于这种映射过程本质上是有损的,因此我们提出了几种策略来完善它,以便可以将属性映射到以最小的失真为2D网格。此外,该方法可以灵活地应用于点云斑块,以更好地适应局部几何复杂性。在这项工作中,我们考虑点云属性压缩;因此,我们使用常规的2D图像编解码器压缩此图像。我们的初步结果表明,所提出的基于折叠的编码方案已经可以达到类似于最新基于MPEG几何的PCC(G-PCC)编解码器的性能。
Existing techniques to compress point cloud attributes leverage either geometric or video-based compression tools. We explore a radically different approach inspired by recent advances in point cloud representation learning. Point clouds can be interpreted as 2D manifolds in 3D space. Specifically, we fold a 2D grid onto a point cloud and we map attributes from the point cloud onto the folded 2D grid using a novel optimized mapping method. This mapping results in an image, which opens a way to apply existing image processing techniques on point cloud attributes. However, as this mapping process is lossy in nature, we propose several strategies to refine it so that attributes can be mapped to the 2D grid with minimal distortion. Moreover, this approach can be flexibly applied to point cloud patches in order to better adapt to local geometric complexity. In this work, we consider point cloud attribute compression; thus, we compress this image with a conventional 2D image codec. Our preliminary results show that the proposed folding-based coding scheme can already reach performance similar to the latest MPEG Geometry-based PCC (G-PCC) codec.