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Numerical Approaches for Linear Left-invariant Diffusions on SE(2), their Comparison to Exact Solutions, and their Applications in Retinal Imaging

Published online by Cambridge University Press:  15 February 2016

Jiong Zhang*
Affiliation:
Department of Biomedical Engineering, Biomedical Image Analysis (BMIA)
Remco Duits*
Affiliation:
Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
Gonzalo Sanguinetti
Affiliation:
Department of Mathematics and Computer Science, Image Science and Technology (IST/e)
Bart M. ter Haar Romeny
Affiliation:
Department of Biomedical Engineering, Biomedical Image Analysis (BMIA)Northeastern University, Shenyang, China
*
*Corresponding and joint main authors.Email addresses:J.Zhang1@tue.nl (J. Zhang), R.Duits@tue.nl (R. Duits), g.r.sanguinetti@tue.nl (G. Sanguinetti), B.M.terhaarRomeny@tue.nl (B.-t.-H. Romeny)
*Corresponding and joint main authors.Email addresses:J.Zhang1@tue.nl (J. Zhang), R.Duits@tue.nl (R. Duits), g.r.sanguinetti@tue.nl (G. Sanguinetti), B.M.terhaarRomeny@tue.nl (B.-t.-H. Romeny)

Abstract

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Left-invariant PDE-evolutions on the roto-translation group SE(2)(and their resolvent equations) have been widely studied in the fields of cortical modeling and image analysis. They include hypo-elliptic diffusion (for contour enhancement) proposed by Citti & Sarti, and Petitot, and they include the direction process (for contour completion) proposed by Mumford. This paper presents a thorough study and comparison of the many numerical approaches, which, remarkably, are missing in the literature. Existing numerical approaches can be classified into 3 categories: Finite difference methods, Fourier based methods (equivalent to SE(2)-Fourier methods), and stochastic methods (Monte Carlo simulations). There are also 3 types of exact solutions to the PDE-evolutions that were derived explicitly (in the spatial Fourier domain) in previous works by Duits and van Almsick in 2005. Here we provide an overview of these 3 types of exact solutions and explain how they relate to each of the 3 numerical approaches. We compute relative errors of all numerical approaches to the exact solutions, and the Fourier based methods show us the best performance with smallest relative errors. We also provide an improvement of Mathematica algorithms for evaluating Mathieu-functions, crucial in implementations of the exact solutions. Furthermore, we include an asymptotical analysis of the singularities within the kernels and we propose a probabilistic extension of underlying stochastic processes that overcomes the singular behavior in the origin of time-integrated kernels. Finally, we show retinal imaging applications of combining left-invariant PDE-evolutions with invertible orientation scores.

Information

Type
Research Article
Copyright
Copyright © Global-Science Press 2016