NDLI: Smoothing under Diffeomorphic Constraints with Homeomorphic Splines

Content Provider	Society for Industrial and Applied Mathematics (SIAM)
Author	Gadat, Sbastien Bigot, Jrmie
Copyright Year	2010
Abstract	In this paper we introduce a new class of diffeomorphic smoothers based on general spline smoothing techniques and on the use of some tools that have been recently developed in the context of image warping to compute smooth diffeomorphisms. This diffeomorphic spline is defined as the solution of an ordinary differential equation governed by an appropriate time-dependent vector field. This solution has a closed form expression which can be computed using classical unconstrained spline smoothing techniques. This method does not require the use of quadratic or linear programming under inequality constraints and has therefore a low computational cost. In a one-dimensional setting, incorporating diffeomorphic constraints is equivalent to imposing monotonicity. Thus, as an illustration, it is shown that such a monotone spline can be used to make monotone any unconstrained estimator of a regression function and that this monotone smoother inherits the convergence properties of the unconstrained estimator. Some numerical experiments are proposed to illustrate its finite sample performances and to compare them with another monotone estimator. We also provide a two-dimensional application on the computation of diffeomorphisms for landmark and image matching.
Starting Page	224
Ending Page	243
Page Count	20
File Format	PDF
ISSN	00361429
DOI	10.1137/080727555
e-ISSN	10957170
Issue Number	1
Volume Number	48
Language	English
Publisher	Society for Industrial and Applied Mathematics
Publisher Date	2010-04-02
Access Restriction	Subscribed
Subject Keyword	nonparametric regression constrained smoothing ordinary differential equation Nonparametric regression time-dependent vector field reproducing kernel Hilbert space monotonicity Numerical approximation and computational geometry splines diffeomorphism
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Numerical Analysis Computational Mathematics

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