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Mathematics of Computation

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Finding well approximating lattices for a finite set of points

Authors: A. Hajdu, L. Hajdu and R. Tijdeman
Journal: Math. Comp. 88 (2019), 369-387
MSC (2010): Primary 11J13, 11H06
Published electronically: April 5, 2018
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Abstract: In this paper we address the task of finding well approximating lattices for a given finite set $ A$ of points in $ {\mathbb{R}}^n$ motivated by practical texture analytic problems. More precisely, we search for $ \boldsymbol {o},\boldsymbol {d_1}, \dots ,\boldsymbol {d_n}\in \mathbb{R}^n$ such that $ \boldsymbol {a}-\boldsymbol {o}$ is close to $ \Lambda =\boldsymbol {d_1}\mathbb{Z}+\dots +\boldsymbol {d_n}\mathbb{Z}$ for every $ \boldsymbol {a}\in A$. First we deal with the one-dimensional case, where we show that in a sense the results are almost the best possible. These results easily extend to the multi-dimensional case where the directions of the axes are given, too. Thereafter we treat the general multi-dimensional case. Our method relies on the LLL algorithm. Finally, we apply the least squares algorithm to optimize the results. We give several examples to illustrate our approach.

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Additional Information

A. Hajdu
Affiliation: Faculty of Informatics, University of Debrecen P.O. Box 12, H-4010 Debrecen, Hungary

L. Hajdu
Affiliation: Institute of Mathematics, University of Debrecen P.O. Box 12, H-4010 Debrecen, Hungary

R. Tijdeman
Affiliation: Mathematical Institute, Leiden University Postbus 9512, 2300 RA Leiden, The Netherlands

Keywords: Diophantine approximation, lattice, LLL algorithm, least squares algorithm
Received by editor(s): April 9, 2016
Received by editor(s) in revised form: January 11, 2017, and August 6, 2017
Published electronically: April 5, 2018
Additional Notes: This research was supported in part by the OTKA grants K100339, NK101680, K115479 and the projects TÁMOP-4.2.2.C-11/1/KONV-2012-0001, EFOP-3.6.2-16-2017-00015 and VKSZ_14-1-2015-0072, SCOPIA: Development of diagnostic tools based on endoscope technology supported by the European Union, co-financed by the European Social Fund.
Article copyright: © Copyright 2018 American Mathematical Society

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