The Annals of Statistics

Multiscale scanning in inverse problems

Katharina Proksch, Frank Werner, and Axel Munk

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Abstract

In this paper, we propose a multiscale scanning method to determine active components of a quantity $f$ w.r.t. a dictionary $\mathcal{U}$ from observations $Y$ in an inverse regression model $Y=Tf+\xi$ with linear operator $T$ and general random error $\xi$. To this end, we provide uniform confidence statements for the coefficients $\langle\varphi,f\rangle$, $\varphi\in\mathcal{U}$, under the assumption that $(T^{*})^{-1}(\mathcal{U})$ is of wavelet-type. Based on this, we obtain a multiple test that allows to identify the active components of $\mathcal{U}$, that is, $\langle f,\varphi\rangle\neq0$, $\varphi\in\mathcal{U}$, at controlled, family-wise error rate. Our results rely on a Gaussian approximation of the underlying multiscale statistic with a novel scale penalty adapted to the ill-posedness of the problem. The scale penalty furthermore ensures convergence of the statistic’s distribution towards a Gumbel limit under reasonable assumptions. The important special cases of tomography and deconvolution are discussed in detail. Further, the regression case, when $T=\text{id}$ and the dictionary consists of moving windows of various sizes (scales), is included, generalizing previous results for this setting. We show that our method obeys an oracle optimality, that is, it attains the same asymptotic power as a single-scale testing procedure at the correct scale. Simulations support our theory and we illustrate the potential of the method as an inferential tool for imaging. As a particular application, we discuss super-resolution microscopy and analyze experimental STED data to locate single DNA origami.

Article information

Source
Ann. Statist., Volume 46, Number 6B (2018), 3569-3602.

Dates
Received: June 2017
Revised: October 2017
First available in Project Euclid: 11 September 2018

Permanent link to this document
https://projecteuclid.org/euclid.aos/1536631284

Digital Object Identifier
doi:10.1214/17-AOS1669

Mathematical Reviews number (MathSciNet)
MR3852662

Zentralblatt MATH identifier
1410.62064

Subjects
Primary: 62G10: Hypothesis testing
Secondary: 62G15: Tolerance and confidence regions 62G20: Asymptotic properties 62G32: Statistics of extreme values; tail inference

Keywords
Multiscale analysis scan statistic ill-posed problem deconvolution super-resolution Gumbel extreme value limit

Citation

Proksch, Katharina; Werner, Frank; Munk, Axel. Multiscale scanning in inverse problems. Ann. Statist. 46 (2018), no. 6B, 3569--3602. doi:10.1214/17-AOS1669. https://projecteuclid.org/euclid.aos/1536631284


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Supplemental materials

  • Supplement to “Multiscale scanning in inverse problems”. This supplementary material contains an explanation of the full width at half maximum (FWHM), a detailed mathematical model for super-resolution STED microscopy, a detailed simulation study for $2$-dimensional support inference and detailed proofs of all theoretical results provided in the main document.