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A Fourth-Order Compact Finite Difference Scheme for Higher-OrderPDE-Based Image Registration
Published online by Cambridge University Press: 10 November 2015
Abstract
Image registration is an ill-posed problem that has been studied widely in recentyears. The so-called curvature-based image registration method is one of themost effective and well-known approaches, as it produces smooth solutions andallows an automatic rigid alignment. An important outstanding issue is theaccurate and efficient numerical solution of the Euler-Lagrange system of twocoupled nonlinear biharmonic equations, addressed in this article. We propose afourth-order compact (FOC) finite difference scheme using a splitting operatoron a 9-point stencil, and discuss how the resulting nonlinear discrete systemcan be solved efficiently by a nonlinear multi-grid (NMG) method. Thus aftermeasuring the h-ellipticity of the nonlinear discrete operator involved by alocal Fourier analysis (LFA), we show that our FOC finite difference method isamenable to multi-grid (MG) methods and an appropriate point-wise smoothingprocedure. A high potential point-wise smoother using an outer-inner iterationmethod is shown to be effective by the LFA and numerical experiments. Realmedical images are used to compare the accuracy and efficiency of our approachand the standard second-order central (SSOC) finite difference scheme in thesame NMG framework. As expected for a higher-order finite difference scheme, theimages generated by our FOC finite difference scheme prove significantly moreaccurate than those computed using the SSOC finite difference scheme. Ournumerical results are consistent with the LFA analysis, and also demonstratethat the NMG method converges within a few steps.
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- Copyright © Global-Science Press 2015
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