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Fundamental theory and R-linear convergence of stretch energy minimization for spherical equiareal parameterization

  • Tsung-Ming Huang EMAIL logo , Wei-Hung Liao and Wen-Wei Lin

Abstract

Here, we extend the finite distortion problem from bounded domains in ℝ2 to closed genus-zero surfaces in ℝ3 by a stereographic projection. Then, we derive a theoretical foundation for spherical equiareal parameterization between a simply connected closed surface M and a unit sphere 𝕊2 by minimizing the total area distortion energy on . After the minimizer of the total area distortion energy is determined, it is combined with an initial conformal map to determine the equiareal map between the extended planes. From the inverse stereographic projection, we derive the equiareal map between M and 𝕊2. The total area distortion energy is rewritten into the sum of Dirichlet energies associated with the southern and northern hemispheres and is decreased by alternatingly solving the corresponding Laplacian equations. Based on this foundational theory, we develop a modified stretch energy minimization function for the computation of spherical equiareal parameterization between M and 𝕊2. In addition, under relatively mild conditions, we verify that our proposed algorithm has asymptotic R-linear convergence or forms a quasi-periodic solution. Numerical experiments on various benchmarks validate that the assumptions for convergence always hold and indicate the efficiency, reliability, and robustness of the developed modified stretch energy minimization function.

JEL Classification: 68U05; 65D18; 65𝔼10

Funding statement: This work was partially supported by the Ministry of Science and Technology (MoST), the National Center for Theoretical Sciences, and the ST Yau Center in Taiwan. W.-W. Lin and T.-M. Huang were partially supported by MoST 110-2115-M-A49-004- and 110-2115-M-003-012-MY3, respectively.

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Received: 2022-08-18
Revised: 2023-07-31
Accepted: 2023-08-10
Published Online: 2023-08-24
Published in Print: 2024-03-25

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