Computing reconstructions from nonuniform Fourier samples: Universality of stability barriers and stable sampling rates
Computing reconstructions from nonuniform Fourier samples: Universality of stability barriers and stable sampling rates
复制标题
从非均匀傅立叶样本计算重建:稳定壁垒和稳定采样率的普遍性
DOI:
10.1016/j.acha.2017.05.004
复制
发表时间:
2019
影响因子:
2.5
通讯作者:
Adcock B
中科院分区:
文献类型:
--
作者:
Adcock B
We study the problem of recovering an unknown compactly-supported multivariate function from samples of its Fourier transform that are acquired nonuniformly, i.e. not necessarily on a uniform Cartesian grid. Reconstruction problems of this kind arise in various imaging applications, where Fourier samples are taken along radial lines or spirals for example.Specifically, we consider finite-dimensional reconstructions, where a limited number of samples is available, and investigate the rate of convergence of such approximate solutions and their numerical stability. We show that the proportion of Fourier samples that allow for stable approximations of a given numerical accuracy is independent of the specific sampling geometry and is therefore universal for different sampling scenarios. This allows us to relate both sufficient and necessary conditions for different sampling setups and to exploit several results that were previously available only for very specific sampling geometries.The results are obtained by developing: (i) a transference argument for different measures of the concentration of the Fourier transform and Fourier samples; (ii) frame bounds valid up to the critical sampling density, which depend explicitly on the sampling set and the spectrum.As an application, we identify sufficient and necessary conditions for stable and accurate reconstruction of algebraic polynomials or wavelet coefficients from nonuniform Fourier data.
登录
查看更多内容
影响因子:
3
作者:
Adcock, Ben;Hansen, Anders C.
通讯作者:
Hansen, Anders C.
影响因子:
2.4
作者:
D. Potts;M. Tasche
通讯作者:
M. Tasche
影响因子:
2.5
作者:
Delattre, Benedicte M. A.;Heidemann, Robin M.;Hyacinthe, Jean-Noel
通讯作者:
Hyacinthe, Jean-Noel
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
Jackie Ma
通讯作者:
Jackie Ma
DOI:
10.1007/978-3-319-19800-2_8
发表时间:
2014
期刊:
arXiv: Numerical Analysis
影响因子:
--
作者:
B. Adcock;M. Gataric;A. Hansen
通讯作者:
A. Hansen