JournalsjemsVol. 24, No. 5pp. 1593–1615

Stable Gabor phase retrieval for multivariate functions

  • Philipp Grohs

    University of Vienna, Austria
  • Martin Rathmair

    University of Vienna, Austria
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Abstract

In recent work [P. Grohs and M. Rathmair, Stable Gabor phase retrieval and spectral clustering, Comm. Pure Appl. Math. (2018)] the instabilities of the Gabor phase retrieval problem, i.e., the problem of reconstructing a function ff from its spectrogram Gf|\mathcal{G}f|, where

Gf(x,y)=Rdf(t)eπtx2e2πitydt,x,yRd,\mathcal{G}f(x,y)=\int_{\mathbb{R}^d} f(t) e^{-\pi|t-x|^2} e^{-2\pi i t\cdot y} dt, \quad x,y\in \mathbb{R}^d,

have been completely classified in terms of the disconnectedness of the spectrogram. These findings, however, were crucially restricted to the one-dimensional case (d=1d=1) and therefore not relevant for many practical applications.

In the present paper we not only generalize the aforementioned results to the multivariate case but also significantly improve on them. Our new results have comprehensive implications in various applications such as ptychography, a highly popular method in coherent diffraction imaging.

Cite this article

Philipp Grohs, Martin Rathmair, Stable Gabor phase retrieval for multivariate functions. J. Eur. Math. Soc. 24 (2022), no. 5, pp. 1593–1615

DOI 10.4171/JEMS/1114