Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CoFiNet: Reliable Coarse-to-fine Correspondences for Robust Point Cloud
  Registration   We study the problem of extracting correspondences between a pair of point
clouds for registration. For correspondence retrieval, existing works benefit
from matching sparse keypoints detected from dense points but usually struggle
to guarantee their repeatability. To address this issue, we present CoFiNet -
Coarse-to-Fine Network which extracts hierarchical correspondences from coarse
to fine without keypoint detection. On a coarse scale and guided by a weighting
scheme, our model firstly learns to match down-sampled nodes whose vicinity
points share more overlap, which significantly shrinks the search space of a
consecutive stage. On a finer scale, node proposals are consecutively expanded
to patches that consist of groups of points together with associated
descriptors. Point correspondences are then refined from the overlap areas of
corresponding patches, by a density-adaptive matching module capable to deal
with varying point density. Extensive evaluation of CoFiNet on both indoor and
outdoor standard benchmarks shows our superiority over existing methods.
Especially on 3DLoMatch where point clouds share less overlap, CoFiNet
significantly outperforms state-of-the-art approaches by at least 5% on
Registration Recall, with at most two-third of their parameters.

27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn