Open AccessSampling requirements and adaptive spatial averaging for incoherent digital holography
Author(s) -
Teruyoshi Nobukawa,
Yutaro Katano,
Tetsuhiko Muroi,
Nobuhiro Kinoshita,
Norihiko Ishii
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.033634
Subject(s) - digital holography , holography , sampling (signal processing) , noise (video) , optics , computer science , spatial frequency , pixel , image resolution , image quality , detector , quantum noise , computer vision , physics , image (mathematics) , quantum mechanics , quantum
Incoherent digital holography (IDH) enables passive 3D imaging under spatially incoherent light; however, the reconstructed images are seriously affected by detector noise. Herein, we derive theoretical sampling requirements for IDH to reduce this noise via simple postprocessing based on spatial averaging. The derived theory provides a significant insight that the sampling requirements vary depending on the recording geometry. By judiciously choosing the number of pixels used for spatial averaging based on the proposed theory, noise can be reduced without losing spatial resolution. We then experimentally verify the derived theory and show that the associated adaptive spatial averaging technique is a practical and powerful way of improving 3D image quality.