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math.NA2010
Fast Preconditioners for Total Variation Deblurring with Anti-Reflective Boundary Conditions
Zheng-Jian Bai, Marco Donatelli, Stefano Serra-Capizzano
In recent works several authors have proposed the use of precise boundary conditions (BCs) for blurring models and they proved that the resulting choice (Neumann or reflective, ant…
math.NA2010
Multigrid methods for Toeplitz linear systems with different size reduction
Marco Donatelli, Stefano Serra-Capizzano, Debora Sesana
Starting from the spectral analysis of g-circulant matrices, we consider a new multigrid method for circulant and Toeplitz matrices with given generating function. We assume that t…