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  • 學位論文

雙重預處理矩陣於影像重建的應用

Two-Level preconditioners for Image Restoration Problem

指導教授 : 陳宜良

摘要


在影像處理中,對於影像的去雜訊與去模糊問題一直研究的課題,而去雜訊與去模糊本身就是背道而馳。 在第二章中,定義 toeplitz 與 circulant 矩陣以及 block toeplitz 與 block circulant 結構,並將離散型傅立葉變換應用於模糊算子K中,加速模糊算子作用於影像的速度。最後定義粗網格子空間以供網格的分解。 在第三章中,利用 two-level preconditioner 於 ill-conditiond 方程組 Au=b,並對粗網格使用共軛梯度法。之後使用Schur Complement Conjugate Gredient 演算法。 在第四章中,介紹實際使用此演算法的細節,並將結果畫於圖中。

並列摘要


This paper is organized as follows. In section 2, we introduce some notations and properties which will be used. In section 3, two-level preconditioner is referred. And finally, in chapter 4 we make numerical test based on the above methods.

參考文獻


[1] L.Rudin; S.Osher; E.Fatemi. Nonlinear total variation based noise removal
[2] Rieder, Andreas. Wavelet multilevel solvers for linear ill-posed problems stabilized
[3] Hanke, Martin; Vogel, Curtis R. Two-level preconditioners for regularized inverse
no. 3, 385{402.
[4] Acar, R.; Vogel, C. R. Analysis of bounded variation penalty methods for illposed

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