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    Speckle reduction of reconstructions of digital holograms using three dimensional filtering


    Maycock, Jonathan and McDonald, John and Hennelly, Bryan M. (2013) Speckle reduction of reconstructions of digital holograms using three dimensional filtering. Optics Communications, 300. pp. 142-155. ISSN 0030-4018

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    Abstract

    We report on a new digital signal processing technique that reduces speckle in reconstructions of digital holograms. This is achieved by convolving the three dimensional intensity pattern (the intensity of the propagated DH at a series of different distances) with a 3D point spread function in all three dimensions (x,y,z ). It is based on the fact that the addition of different independent speckle images on an intensity basis reduces the speckle content. We provide quantitative results in terms of speckle index and resolution, and show that filtering in the z direction has the added benefit of an increase the depth of focus of the digital hologram reconstruction.

    Item Type: Article
    Additional Information: This is the preprint version of the article published in Optics Communications, which is available at doi: 10.1016/j.optcom.2013.02.062
    Keywords: Digital Holography; Speckle Reduction; 3D Filtering; Digital signal processing;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Faculty of Science and Engineering > Research Institutes > Callan Institute
    Item ID: 6691
    Identification Number: https://doi.org/10.1016/j.optcom.2013.02.062
    Depositing User: Dr. Bryan Hennelly
    Date Deposited: 18 Dec 2015 16:11
    Journal or Publication Title: Optics Communications
    Publisher: Elsevier
    Refereed: Yes
    URI:

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