Flipped structured matrix-sequences in image deblurring with general boundary conditions

Motivated by a recent work on a preconditioned MINRES for flipped linear systems in imaging, in this note we extend the scope of that research for including more precise boundary conditions such as reflective and anti-reflective ones. We prove spectral results for the matrix-sequences associated to...

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Bibliographic Details
Main Authors Ferrari, Paola, Furci, Isabella, Serra-Capizzano, Stefano
Format Journal Article
LanguageEnglish
Published 19.02.2024
Subjects
Computer Science - Numerical Analysis
Mathematics - Numerical Analysis
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Summary:Motivated by a recent work on a preconditioned MINRES for flipped linear systems in imaging, in this note we extend the scope of that research for including more precise boundary conditions such as reflective and anti-reflective ones. We prove spectral results for the matrix-sequences associated to the original problem, which justify the use of the MINRES in the current setting. The theoretical spectral analysis is supported by a wide variety of numerical experiments, concerning the visualization of the spectra of the original matrices in various ways. We also report numerical tests regarding the convergence speed and regularization features of the associated GMRES and MINRES methods. Conclusions and open problems end the present study.
DOI:10.48550/arxiv.2402.12059