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## 48x36 Poster Template

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### Title: 48x36 Poster Template Subject: Free PowerPoint poster templates Author: A. Kotoulas Keywords: poster presentation, poster design, poster template – PowerPoint PPT presentation

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Title: 48x36 Poster Template

1
Point Cloud Skeletons via Laplacian-Based
Contraction School of Mathematical Sciences,
Dalian University of Technology, Dalian,
China School of Computing Science, Simon Fraser
MOTIVATION
TOPOLOGY THINNING
COMPARISON
1. Extract curve skeleton directly from point
clouds.
2. Repair topology of acquired point clouds in the
presence of large amounts of missing data via
skeleton.

Figure 6 Comparison with Reeb Graph method
Figure 5 Comparison with Potential Field method
Figure 1. Point cloud skeleton and
skeleton-assisted topology repair and surface
reconstruction. Original model. (b) Input point
cloud with missing data. (c) Curve skeleton
extracted, while descriptive, contains
topological errors. After simple user operations
to repair the skeleton (d), topologically correct
surface reconstruction is obtained (e), compared
to the result of Poisson reconstruction (f) from
(b).
Figure 7 Comparison of Reeb Graph, Deformable
blob, ROSA, our method, and Mesh contraction
method.
SKELETON DRIVEN POINT CLOUD RECONSTRUCTION
THE RESULTS
OUTLINE
Give a point cloud and a refined curve skeleton,
we can compute the signed distance field of the
shape, and extract its zero-level-set iso-surface
as the reconstructed surface.
Figure 2 Skeletonization of models with
spherical, sheet-like region and close-by
structure.

Figure 8 Reconstruction on a skeleton
cross-section (left) and reconstruction along a
skeleton branch.
GEOMETRY CONTRACTION
Attraction constraint
Contraction constraint
Figure 3 Skeletonization of models with missing
data.
b
d
c
Figure 4 Skeletonization of models with holes and
boundaries.
Figure 8 Reconstruction from sparse data. Left
The input point clouds. Middle Reconstruction
achieved by straightforward Poisson
reconstruction is under-constrained in
under-sampled regions. Right The skeleton
provides topological and geometrical hints that
guides reconstruction toward a more suitable
solution.