Probabilistic image reconstruction for radio interferometers
Probabilistic image reconstruction for radio interferometers
复制标题
无线电干涉仪的概率图像重建
DOI:
10.1093/mnras/stt2244
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
B. Wandelt
中科院分区:
文献类型:
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作者:
P. Sutter;B. Wandelt
We present a novel, general-purpose method for deconvolving and denoising images from gridded radio interferometric visibilities using Bayesian inference based on a Gaussian process model. The method automatically takes into account incomplete coverage of the uv-plane and mode coupling due to the beam. Our method uses Gibbs sampling to efficiently explore the full posterior distribution of the underlying signal image given the data. We use a set of widely diverse mock images with a realistic interferometer setup and level of noise to assess the method. Compared to results from a proxy for the CLEAN method we find that in terms of RMS error and signal-to-noise ratio our approach performs better than traditional deconvolution techniques, regardless of the structure of the source image in our test suite. Our implementation scales as O(np log np), provides full statistical and uncertainty information of the reconstructed image, requires no supervision, and provides a robust, consistent framework for incorporating noise and parameter marginalizations and foreground removal.
DOI:
10.1117/12.924907
发表时间:
2012
期刊:
--
影响因子:
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作者:
Baron F
通讯作者:
Baron F