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首页高效球面映射算法与球谐分析应用
高效球面映射算法与球谐分析应用
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本文主要探讨了一种高效且适用于封闭零曲率表面的球面映射算法,以及该算法在球谐分析中的应用。在计算机图形学和信息技术领域,对光滑、无间隙的球面参数化处理是至关重要的,因为这有助于保持几何模型的自然外观和性能。作者提出了一种基于层次优化的方法,目标是通过最小化一个非线性能量函数,平衡角度和面积扭曲,从而实现对封闭零曲率表面的高精度球面参数化。 该算法的核心在于其高效性,它能够在处理大型几何模型时展现出良好的收敛性。在设计过程中,重点考虑了保持映射的双射性和低度扭曲,这对于保持原始形状的精确度至关重要。双射性确保了每个表面点在球面上都有唯一对应,而低度扭曲则意味着变形程度小,避免了严重的失真现象。 在实现上,作者可能采用了迭代优化技术,通过对角度和面积的连续调整,逐步逼近理想的球面参数化。这种技术允许对复杂的几何结构进行精细控制,同时处理大规模的数据集,提高了算法的实用性。 此外,文中还提到了与球谐分析的结合。球谐函数是解决许多几何和物理问题的有效工具,特别是在处理球面信号处理、计算机视觉和数值计算中。将此算法应用于球谐表示,可能会增强对复杂形状的分析和建模能力,如光照模拟、纹理映射或信号频谱分析。 这篇文章的贡献在于提供了一种创新的球面映射算法,它在保持几何细节的同时,能够适应大规模数据处理,对于提升三维图形学和相关领域的计算效率具有显著的价值。研究者们可以利用这个算法来改进模型的可视化效果,或者加速涉及球面相关计算的仿真和数据分析任务。
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RESEARCH PAPER
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Special Focus
SCIENCE CHINA
Information Sciences
September 2013, Vol. 56 092103:1–092103:10
doi: 10.1007/s11432-013-4992-5
c
Science China Press and Springer-Verlag Berlin Heidelberg 2013 info.scichina.com www.springerlink.com
An efficient spherical mapping algorithm and
its application on spherical harmonics
WAN ShengHua
1
, YE TengFei
2
, LI MaoQing
2
, ZHANG HongChao
3
&LIXin
1 ∗
1
School of Electrical Engineering and Computer Science, Louisiana State University (LSU),
Baton Rouge, LA 70803,USA;
2
Department of Automation, Xiamen University, Xiamen 361005,China;
3
Department of Mathematics, LSU, Baton Rouge, LA 70803,USA
Received April 6, 2013; accepted July 24, 2013
Abstract The sphere is a natural and seamless parametric domain for closed genus-0 surfaces. We introduce an
efficient hierarchical optimization approach for the computation of spherical parametrization for closed genus-0
surfaces by minimizing a nonlinear energy balancing angle and area distortions. The mapping results are bijective
and lowly distorted. Our algorithm converges efficiently and is suitable to manipulate large-scale geometric
models. We demonstrate and analyze the effectiveness of our mapping in spherical harmonics decomposition.
Keywords spherical parametrization, hierarchical optimization, spherical harmonics
Citation Wan S H, Ye T F, Li M Q, et al. An efficient spherical mapping algorithm and its application on
spherical harmonics. Sci China Inf Sci, 2013, 56: 092103(10), doi: 10.1007/s11432-013-4992-5
1 Introduction
A large number of geometric models are bounded by genus-0 surfaces. The sphere is a natural parametric
domain for these surfaces since a seamless parametric representation can be constructed directly on this
domain. Hence a spherical mapping algorithm that computes a bijective map between a given closed
genus-0 surface and a unit sphere is an important tool for many applications. The map that minimizes
the distortion of some metrics is preferred. An ideal mapping preserving angles between curves, areas of
regions, and hence geodesic distances between points, is called an isometric map. Unfortunately, isometric
maps do not exist for most generally given surfaces. People therefore seek for a map that minimizes either
angle distortion, area distortion, or a combination of both of them.
Surface mapping to planar domain has been extensively studied in computer graphics literatures [1,2]
(see [3] for a survey). Many efficient algorithms have been developed to flatten the curved surfaces.
Computing a map on a non-flattened domain, however, is often formulated as a non-linear optimization
problem, and cannot be computed efficiently [2]. For example, a harmonic spherical map is conformal [4,5].
The resultant mapping is angle-preserving. However, its area distortion could be very large, especially in
the long and thin protrusion regions (e.g., ears of the Stanford Bunny). A map balancing angle and area
∗
Corresponding author (email: xinli@lsu.edu)
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