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arXiv 1105.2690math.NAcs.NA
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一般数据失配泛函的迭代正则化牛顿型方法及其在泊松数据中的应用

Iteratively regularized Newton-type methods for general data misfit functionals and applications to Poisson data

Thorsten Hohage, Frank Werner

AI总结:

针对Banach空间中非线性算子方程的反问题,提出一种使用一般数据失配泛函和凸正则化项的迭代正则化牛顿型方法,证明了先验和后验停止规则下的收敛性与收敛率,并应用于泊松数据反问题(如障碍物散射和相位恢复)。

摘要:

我们研究Banach空间中由非线性算子方程$F(u)=g$描述的反问题的牛顿型方法,其中牛顿方程$F'(u_n;u_{n+1}-u_n) = g-F(u_n)$通过使用一般数据失配泛函和凸正则化项进行变分正则化。这推广了众所周知的迭代正则化高斯-牛顿方法(IRGNM)。我们证明了当噪声水平趋于0时,在先验停止规则和Lepski{\uı}型后验停止规则下的收敛性和收敛率。我们的分析将IRGNM之前的阶最优收敛率结果作为特例包含在内。本文主要关注泊松数据反问题,其中自然数据失配泛函由Kullback-Leibler散度给出。详细讨论了此类问题的两个例子:具有远场模式振幅数据的逆障碍物散射问题和相位恢复问题。数值例子说明了所提方法在这些问题上的性能。

英文摘要:

We study Newton type methods for inverse problems described by nonlinear operator equations $F(u)=g$ in Banach spaces where the Newton equations $F'(u_n;u_{n+1}-u_n) = g-F(u_n)$ are regularized variationally using a general data misfit functional and a convex regularization term. This generalizes the well-known iteratively regularized Gauss-Newton method (IRGNM). We prove convergence and convergence rates as the noise level tends to 0 both for an a priori stopping rule and for a Lepski{\uı}-type a posteriori stopping rule. Our analysis includes previous order optimal convergence rate results for the IRGNM as special cases. The main focus of this paper is on inverse problems with Poisson data where the natural data misfit functional is given by the Kullback-Leibler divergence. Two examples of such problems are discussed in detail: an inverse obstacle scattering problem with amplitude data of the far-field pattern and a phase retrieval problem. The performence of the proposed method for these problems is illustrated in numerical examples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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