Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/11405
Title: Fitting smooth paths on riemannian manifolds
Authors: Machado, Luís Miguel 
Leite, F. Silva 
Keywords: Covariant differentiation; Curvature tensor; Geodesics; Geodesic distance; Riemannian cubic polynomials; Normal equations
Issue Date: 2004
Publisher: Centro de Matemática da Universidade de Coimbra
Citation: Pré-Publicações DMUC. 04-31 (2004)
Abstract: In this paper we formulate a least squares problem on a Riemannian manifold M, in order to generate smoothing spline curves fitting a given data set of points in M, q0, q1, . . . , qN, at given instants of time t0 < t1 < • • • < tN. Using tools from Riemannian geometry, we derive the Euler-Lagrange equations associated to this variational problem and prove that its solutions are Riemannian cubic polynomials defined at each interval [ti, ti+1[, i = 0, . . . ,N −1, and satisfying some smoothing constraints at the knot points ti. The geodesic that best fits the data, arises as a limiting process of the above. When M is replaced by the Euclidean space IRn, the proposed problem has a unique solution which is a natural cubic spline given explicitly in terms of the data. We prove that, in this case, the straight line obtained from the limiting process is precisely the linear regression line associated to the data. Using tools from optimization on Riemannian manifolds we also present a direct procedure to generate geodesics fitting a given data set of time labelled points for the particular cases when M is the Lie group SO(n) and the unitary n−sphere Sn.
URI: http://hdl.handle.net/10316/11405
Rights: openAccess
Appears in Collections:FCTUC Matemática - Artigos em Revistas Nacionais

Files in This Item:
File Description SizeFormat
Fitting smooth paths on riemannian manifolds.pdf285.54 kBAdobe PDFView/Open
Show full item record

Page view(s) 50

350
checked on Aug 5, 2020

Download(s) 50

171
checked on Aug 5, 2020

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.