Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Self-supervised Point Cloud Completion on Real Traffic Scenes via
  Scene-concerned Bottom-up Mechanism   Real scans always miss partial geometries of objects due to the
self-occlusions, external-occlusions, and limited sensor resolutions. Point
cloud completion aims to refer the complete shapes for incomplete 3D scans of
objects. Current deep learning-based approaches rely on large-scale complete
shapes in the training process, which are usually obtained from synthetic
datasets. It is not applicable for real-world scans due to the domain gap. In
this paper, we propose a self-supervised point cloud completion method (TraPCC)
for vehicles in real traffic scenes without any complete data. Based on the
symmetry and similarity of vehicles, we make use of consecutive point cloud
frames to construct vehicle memory bank as reference. We design a bottom-up
mechanism to focus on both local geometry details and global shape features of
inputs. In addition, we design a scene-graph in the network to pay attention to
the missing parts by the aid of neighboring vehicles. Experiments show that
TraPCC achieve good performance for real-scan completion on KITTI and nuScenes
traffic datasets even without any complete data in training. We also show a
downstream application of 3D detection, which benefits from our completion
approach.

16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph