A Second Order Nonsmooth Variational Model for Restoring Manifold-Valued Images
A Second Order Nonsmooth Variational Model for Restoring Manifold-Valued Images
复制标题
恢复流形值图像的二阶非光滑变分模型
DOI:
10.1137/15m101988x
复制
发表时间:
2016
期刊:
影响因子:
--
通讯作者:
A. Weinmann
中科院分区:
文献类型:
--
作者:
Bačák;R. Bergmann;G. Steidl;A. Weinmann
We introduce a new nonsmooth variational model for the restoration of manifold-valued data which includes second order differences in the regularization term. While such models were successfully applied for real-valued images, we introduce the second order difference and the corresponding variational models for manifold data, which up to now only existed for cyclic data. The approach requires a combination of techniques from numerical analysis, convex optimization, and differential geometry. First, we establish a suitable definition of absolute second order differences for signals and images with values in a manifold. Employing this definition, we introduce a variational denoising model based on first and second order differences in the manifold setup. In order to minimize the corresponding functional, we develop an algorithm using an inexact cyclic proximal point algorithm. We propose an efficient strategy for the computation of the corresponding proximal mappings in symmetric spaces utilizing the machinery of Jacobi fields. For the-sphere and the manifold of symmetric positive definite matrices, we demonstrate the performance of our algorithm in practice. We prove the convergence of the proposed exact and inexact variant of the cyclic proximal point algorithm in Hadamard spaces. These results which are of interest on its own include, e.g., the manifold of symmetric positive definite matrices.
登录
查看更多内容
DOI:
--
发表时间:
2012
期刊:
--
影响因子:
--
作者:
T. Valkonen;Florian Knoll
通讯作者:
T. Valkonen;Florian Knoll
DOI:
--
发表时间:
2011
期刊:
Scale Space and Variational Methods in Computer Vision
影响因子:
--
作者:
G. Rosman;M. Bronstein;A. Bronstein;A. Wolf;R. Kimmel
通讯作者:
R. Kimmel
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
P. Grohs;J. Wallner
通讯作者:
J. Wallner
DOI:
--
发表时间:
1961
期刊:
影响因子:
--
作者:
H. Rauch
通讯作者:
H. Rauch
影响因子:
2
作者:
D. Cremers;Evgeny Strekalovskiy
通讯作者:
Evgeny Strekalovskiy