A novel binary and multilevel phase masks for enhanced depth-of-focus infrared imaging

V. Katkovnik, Nicholas Hogasten, Karen Egiazarian

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

    2 Citations (Scopus)


    This paper introduces novel binary and multilevel phase masks (BPMs) for improved depth of focus (DoF) in infrared imaging. The procedure developed for design of BPMs combines two ideas: cubic wavefront coding (WFC) of continuous absolute phase and original discretization of this phase profile. Both these ingredients of the design make the optical system robust with respect to defocus and uncontrolled variations in the optical system. The method allows us to design a flat and very thin BPM using piecewise invariant diffractive optical element (DOE) of simple geometry. The BPMs are used for wavefront modulation in two optical setups: a lensless system and a lens/BPM optical hybrid. Computational inverse imaging (deblurring) is applied in order to reconstruct a sharp image from respective blurred observations. The optical system is optimized end-to-end, including both the BPMs and the deblurring algorithm. Simulation experiments demonstrated for midwave infrared (MWIR) imaging, show high quality imaging even for very large amounts of defocus. Imaging systems incorporating this method show advantages over conventional optical systems with a refractive lens.
    Original languageEnglish
    Title of host publication2018 52nd Asilomar Conference on Signals, Systems, and Computers
    Number of pages5
    ISBN (Electronic)978-1-5386-9218-9
    ISBN (Print)978-1-5386-9219-6
    Publication statusPublished - Oct 2018
    Publication typeA4 Article in conference proceedings
    EventAsilomar Conference on Signals, Systems and Computers -
    Duration: 1 Jan 1900 → …

    Publication series

    ISSN (Electronic)2576-2303


    ConferenceAsilomar Conference on Signals, Systems and Computers
    Period1/01/00 → …


    • Optical imaging
    • Lenses
    • Optical diffraction
    • Optical refraction
    • Optical distortion
    • Optical sensors
    • Binary phase mask design
    • wavefront coding
    • extended depth of focus
    • computational imaging
    • inverse imaging

    Publication forum classification

    • Publication forum level 1


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