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Nonrigid image registration with fractional differential equations

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Solves fractional vector Helmholtz equation in 2D and 3D for use in nonrigid image registration

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Implementation of 2D and 3D vector-valued versions of eqn. (8) in Garvey et al., "Nonrigid Image Registration with Two-sided Space-Fractional Partial Differential Equations," submitted to International Conference on Image Processing, 2013. This equation represents a single time step in a semi-implicit discretization of a fractional PDE (Helmholtz-like equation).

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