On the second-order asymptotical regularization of linear ill-posed inverse problems

被引:45
|
作者
Zhang, Y. [1 ,2 ]
Hofmann, B. [1 ]
机构
[1] Tech Univ Chemnitz, Fac Math, Chemnitz, Germany
[2] Orebro Univ, Sch Sci & Technol, Orebro, Sweden
关键词
Michael Klibanov; Linear ill-posed problems; asymptotical regularization; second-order method; convergence rate; source condition; index function; qualification; discrepancy principle; DYNAMICAL-SYSTEM; HILBERT; INTEGRATORS;
D O I
10.1080/00036811.2018.1517412
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
In this paper, we establish an initial theory regarding the second-order asymptotical regularization (SOAR) method for the stable approximate solution of ill-posed linear operator equations in Hilbert spaces, which are models for linear inverse problems with applications in the natural sciences, imaging and engineering. We show the regularizing properties of the new method, as well as the corresponding convergence rates. We prove that, under the appropriate source conditions and by using Morozov's conventional discrepancy principle, SOAR exhibits the same power-type convergence rate as the classical version of asymptotical regularization (Showalter's method). Moreover, we propose a new total energy discrepancy principle for choosing the terminating time of the dynamical solution from SOAR, which corresponds to the unique root of a monotonically non-increasing function and allows us to also show an order optimal convergence rate for SOAR. A damped symplectic iterative regularizing algorithm is developed for the realization of SOAR. Several numerical examples are given to show the accuracy and the acceleration effect of the proposed method. A comparison with other state-of-the-art methods are provided as well.
引用
收藏
页码:1000 / 1025
页数:26
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