Sparse interferometric Stokes imaging under the polarization constraint (Polarized SARA)
Sparse interferometric Stokes imaging under the polarization constraint (Polarized SARA)
复制标题
偏振约束下的稀疏干涉斯托克斯成像(Polarized SARA)
DOI:
10.1093/mnras/sty1182
复制
发表时间:
2018
影响因子:
4.8
通讯作者:
Birdi J
中科院分区:
文献类型:
--
作者:
Birdi J
We develop a novel algorithm for sparse imaging of Stokes parameters in radio interferometry under the polarization constraint. The latter is a physical non-linear relation between the Stokes parameters, imposing the polarization intensity as a lower bound on the total intensity. To solve the joint inverse Stokes imaging problem including this bound, we leverage epigraphical projection techniques in convex optimization and we design a primal–dual method offering a highly flexible and parallelizable structure. In addition, we propose to regularize each Stokes parameter map through an average sparsity prior in the context of a reweighted analysis approach (SARA). The resulting method is dubbed Polarized SARA. Using simulated observations of M87 with the Event Horizon Telescope, we demonstrate that imposing the polarization constraint leads to superior image quality. For the considered data sets, the results also indicate better performance of the average sparsity prior in comparison with the widely used Cotton–Schwabcleanalgorithm and other total variation based priors for polarimetric imaging. Ourmatlabcode is available online on GitHub.
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DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
É. Thiébaut
通讯作者:
É. Thiébaut
影响因子:
4.1
作者:
Y. Wiaux;L. Jacques;P. Vandergheynst
通讯作者:
P. Vandergheynst
影响因子:
4.8
作者:
L. Pratley;M. Johnston
通讯作者:
M. Johnston
DOI:
10.1007/978-3-642-38267-3_11
发表时间:
2013-06
期刊:
--
影响因子:
--
作者:
S. Harizanov;J. Pesquet;G. Steidl
通讯作者:
S. Harizanov;J. Pesquet;G. Steidl
影响因子:
4.8
作者:
A. Repetti;J. Birdi;A. Dabbech;Y. Wiaux
通讯作者:
Y. Wiaux