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Single exposure lensless subpixel phase imaging

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Original languageEnglish
Title of host publicationDigital Optical Technologies 2019
EditorsBernard C. Kress, Peter Schelkens
PublisherSPIE, IEEE
Number of pages9
ISBN (Electronic)9781510628038
Publication statusPublished - 2019
Publication typeA4 Article in a conference publication
EventDigital Optical Technologies - Munich, Germany
Duration: 24 Jun 201926 Jun 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceDigital Optical Technologies


Lensless phase-retrieval system with phase modulation of free propagation wavefront is proposed. Contrary to the traditional super-resolution phase-retrieval, the method in this paper requires a single observation only and uses advanced SR-SPAR iterative technique. Successful object imaging relies on modulation of the object wavefront with a random phase-mask, which generates enlarged intensity patterns, allowing us to extract more information than it is possible without such a mask. The achieved high-quality super-resolution phase-imaging is demonstrated by simulation-tests produced with the parameters corresponding to the physical prototype of the considered optical system.


  • Diffractive optical element, Lensless imaging, Lensless system design, Phase imaging, Phase measurement, Phase retrieval, Sparse representation, Sub-pixel resolution

Publication forum classification

Field of science, Statistics Finland