Uniqueness results in an extension of Pauli's phase retrieval problem

被引:47
作者
Jaming, Philippe [1 ,2 ]
机构
[1] Univ Bordeaux, IMB, UMR 5251, F-33400 Talence, France
[2] CNRS, IMB, UMR 5251, F-33400 Talence, France
关键词
Phase retrieval; Pauli problem; Fractional Fourier transform; Entire function of finite order; FRACTIONAL FOURIER-TRANSFORM; COMPLEX SIGNAL RECOVERY; OPTICAL IMPLEMENTATION; ELECTRON-MICROSCOPY; FREQUENCY-DOMAIN; STRONG OBJECTS; X-RAYS; RECONSTRUCTION; TOMOGRAPHY; MAGNITUDE;
D O I
10.1016/j.acha.2014.01.003
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
In this paper, we investigate an extension of Pauli's phase retrieval problem. The original problem asks whether a function u is uniquely determined by its modulus vertical bar u vertical bar and the modulus of its Fourier transform vertical bar Fu vertical bar up to a constant phase factor. Here we extend this problem by considering the uniqueness of the phase retrieval problem for the fractional Fourier transform (FrFT) of variable order. This problem occurs naturally in optics and quantum physics. More precisely, we show that if u and v are such that fractional Fourier transforms of order a have same modulus vertical bar F(alpha)u vertical bar = vertical bar F(alpha)v vertical bar for some set tau- of alpha's, then v is equal to u up to a constant phase factor. The set tau depends on some extra assumptions either on u or on both u and v. Cases considered here are u, v of compact support, pulse trains, Hermite functions or linear combinations of translates and dilates of Gaussians. In this last case, the set tau may even be reduced to a single point (i.e. one fractional Fourier transform may suffice for uniqueness in the problem). (C) 2014 Elsevier Inc. All rights reserved.
引用
收藏
页码:413 / 441
页数:29
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