【点云识别】Learning to Segment 3D Point Clouds in 2D Image Space (CVPR 2020)

Learning to Segment 3D Point Clouds in 2D Image Space

本文介绍一篇cvpr2020里面关于点云部件分割的文章。
论文
代码

1. 问题

相比于2D U-net 的架构上,点云上的部件分割没有取得比较好的进展。
所以这篇文章,将3D点云投影到2D空间上,再使用U-net的架构进行分割,取得的效果可谓是遥遥领先!

在这里插入图片描述

2. 思想

整体流程就是以下三步

  • Construct graphs from point clouds.
  • Project graphs into images using graph drawing.
  • Segment points using U-Net.

在这里插入图片描述
首先将2048个点,来源于shapent 或者partnet, 将其聚类成32个类别。 然后将这32个聚类中心映射到16x16规格的grid上。然后,对于属于一类的点,将他们再映射

The field of 3D point cloud semantic segmentation has been rapidly growing in recent years, with various deep learning approaches being developed to tackle this challenging task. One such approach is the U-Next framework, which has shown promising results in enhancing the semantic segmentation of 3D point clouds. The U-Next framework is a small but powerful network that is designed to extract features from point clouds and perform semantic segmentation. It is based on the U-Net architecture, which is a popular architecture used in image segmentation tasks. The U-Next framework consists of an encoder and a decoder, with skip connections between them to preserve spatial information. One of the key advantages of the U-Next framework is its ability to handle large-scale point clouds efficiently. It achieves this by using a hierarchical sampling strategy that reduces the number of points in each layer, while still preserving the overall structure of the point cloud. This allows the network to process large-scale point clouds in a more efficient manner, which is crucial for real-world applications. Another important aspect of the U-Next framework is its use of multi-scale feature fusion. This involves combining features from different scales of the point cloud to improve the accuracy of the segmentation. By fusing features from multiple scales, the network is able to capture both local and global context, which is important for accurately segmenting complex 3D scenes. Overall, the U-Next framework is a powerful tool for enhancing the semantic segmentation of 3D point clouds. Its small size and efficient processing make it ideal for real-time applications, while its multi-scale feature fusion allows it to accurately segment complex scenes. As the field of 3D point cloud semantic segmentation continues to grow, the U-Next framework is likely to play an increasingly important role in advancing this area of research.
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