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Integral estimation from point cloud in d-dimensional space: a geometric view
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Annual Symposium on Computational Geometry archive
Proceedings of the 25th annual symposium on Computational geometry table of contents
Aarhus, Denmark
SESSION: Monday, June 8 - 4:40-5:40 pm table of contents
Pages 116-124  
Year of Publication: 2009
ISBN:978-1-60558-501-7
Authors
Chuanjiang Luo  The Ohio State University, Columbus, OH, USA
Jian Sun  Stanford University, Palo Alto, CA, USA
Yusu Wang  The Ohio State University, Columbus, OH, USA
Sponsors
ACM: Association for Computing Machinery
SIGACT: ACM Special Interest Group on Algorithms and Computation Theory
SIGGRAPH: ACM Special Interest Group on Computer Graphics and Interactive Techniques
Publisher
ACM  New York, NY, USA
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ABSTRACT

Integration over a domain, such as a Euclidean space or a Riemannian manifold, is a fundamental problem across scientific fields. Many times, the underlying domain is only accessible through a discrete approximation, such as a set of points sampled from it, and it is crucial to be able to estimate integral in such discrete settings. In this paper, we study the problem of estimating the integral of a function defined over a k-submanifold embedded in $d$-dimensional space, from its function values at a set of sample points. Previously, such estimation is usually obtained in a statistical setting, where input data is typically assumed to be drawn from certain probabilistic distribution. Our paper is the first to consider this important problem of estimating integral from point clouds data (PCD) under the more general non-statistical setting, and provide certain theoretical guarantees. Our approaches consider the problem from a geometric point of view. Specifically, we estimate the integral by computing a weighted sum, and propose two weighting schemes: the Voronoi and the Principle Eigenvector schemes. The running time of both methods depends mostly on the intrinsic dimension of the underlying manifold, instead of on the ambient dimensions. We show that the estimation based on the Voronoi scheme converges to the true integral under the so-called (ε, δ)-sampling condition with explicit error bound presented. This is the first result of this sort for estimating integral from general PCD. For the Principle Eigenvector scheme, although no theoretical guarantee is established, we present its connection to the Heat diffusion operator, and illustrate justifications behind its construction. Experimental results show that both new methods consistently produce more accurate integral estimations than common statistical methods under various sampling conditions.


REFERENCES

Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

 
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Collaborative Colleagues:
Chuanjiang Luo: colleagues
Jian Sun: colleagues
Yusu Wang: colleagues