Fourier phase retrieval with a single mask by Douglas-Rachford algorithms.

Fourier phase retrieval with a single mask by Douglas-Rachford algorithms.
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通过 Douglas-Rachford 算法使用单个掩模进行傅里叶相位检索。

DOI:
10.1016/j.acha.2016.07.003
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发表时间:
2018-05
影响因子:
2.5
通讯作者:
Fannjiang A
Fannjiang A
中科院分区:
数学1区
文献类型:
--
作者:
Chen P;Fannjiang A

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分析了傅里叶域道格拉斯-拉奇福德(FDR)算法的相位恢复与一个单一的随机掩模。由于相位恢复解决方案的唯一性需要多于单个过采样编码衍射图案,因此以以下形式中的任一种施加额外信息:1)对象上的扇区条件; 2)另一过采样衍射图案,编码或未编码。对于这两种情形,证明了投影不动点的唯一性,对于情形2),导出了局部几何收敛性,其收敛速度由谱间隙条件给出。数值实验表明,全球,幂律收敛的FDR从任意初始化的设置以及3个或更多的编码衍射图案没有过采样。在实践中,几何收敛可以恢复从幂律制度通过一个简单的投影技巧,导致高精度重建从一般的初始化。
The Fourier-domain Douglas-Rachford (FDR) algorithm is analyzed for phase retrieval with a single random mask. Since the uniqueness of phase retrieval solution requires more than a single oversampled coded diffraction pattern, the extra information is imposed in either of the following forms: 1) the sector condition on the object; 2) another oversampled diffraction pattern, coded or uncoded. For both settings, the uniqueness of projected fixed point is proved and for setting 2) the local, geometric convergence is derived with a rate given by a spectral gap condition. Numerical experiments demonstrate global, power-law convergence of FDR from arbitrary initialization for both settings as well as for 3 or more coded diffraction patterns without oversampling. In practice, the geometric convergence can be recovered from the power-law regime by a simple projection trick, resulting in highly accurate reconstruction from generic initialization.
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