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inria-00608255, version 2

## Computing the Distance between Piecewise-Linear Bivariate Functions

Guillaume Moroz () 1, Boris Aronov 2

SODA - Proceedings of the Twenty-Third Annual ACM-SIAM Symposium on Discrete Algorithms - 2012 (2012)

Abstract: We consider the problem of computing the distance between two piecewise-linear bivariate functions $f$ and $g$ defined over a common domain $M$. We focus on the distance induced by the $L_2$-norm, that is $\|f-g\|_2=\sqrt{\iint_M (f-g)^2}$. If $f$ is defined by linear interpolation over a triangulation of $M$ with $n$ triangles, while $g$ is defined over another such triangulation, the obvious naïve algorithm requires $\Theta(n^2)$ arithmetic operations to compute this distance. We show that it is possible to compute it in $\O(n\log^4 n)$ arithmetic operations, by reducing the problem to multi-point evaluation of a certain type of polynomials. We also present an application to terrain matching.

• 1:  VEGAS (INRIA Lorraine - LORIA)
• INRIA – CNRS : UMR7503 – Université Henri Poincaré - Nancy I – Université Nancy II – Institut National Polytechnique de Lorraine (INPL)
• 2:  Polytechnic institute of New York University (NYU-Poly)
• New York University
• Domain : Computer Science/Computational Geometry
Computer Science/Symbolic Computation
Computer Science/Computational Complexity
• Keywords : piecewise-linear functions – integration – $L^2$-norm – multi-point evaluation – algebraic methods
• Available versions :  v1 (2011-07-12) v2 (2011-07-13)

• inria-00608255, version 2
• oai:hal.inria.fr:inria-00608255
• From:
• Submitted on: Tuesday, 12 July 2011 22:58:11
• Updated on: Wednesday, 6 February 2013 15:43:11