Fast-switching laterally virtual-moving microlens array for enhancing spatial resolution in light-field imaging system without degradation of angular sampling resolution

We present an electrically controllable fast-switching virtual-moving microlens array (MLA) consisting of a stacked structure of two polarization-dependent microlens arrays (PDMLAs) with optical orthogonality, where the position of the two stacked PDMLAs is shifted by half the elemental pitch in the...

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Bibliographic Details
Published in:Scientific reports 2019-08, Vol.9 (1), p.11297-14, Article 11297
Main Authors: Park, Min-Kyu, Park, Heewon, Joo, Kyung-Il, Lee, Tae-Hyun, Kwon, Ki-Chul, Erdenebat, Munkh-Uchral, Lim, Young-Tae, Kim, Nam, Kim, Hak-Rin
Format: Article
Language:English
Subjects:
639/166/987
639/624/1075
639/624/1107/510
Humanities and Social Sciences
Image processing
Microscopes
multidisciplinary
Polarization
Sampling
Science
Science (multidisciplinary)
Spatial discrimination
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Summary:We present an electrically controllable fast-switching virtual-moving microlens array (MLA) consisting of a stacked structure of two polarization-dependent microlens arrays (PDMLAs) with optical orthogonality, where the position of the two stacked PDMLAs is shifted by half the elemental pitch in the diagonal direction. By controlling the polarization of the incident light without the physical movement of the molecules comprising the virtual-moving MLA, the periodic sampling position of the MLA can be switched fast using a polarization-switching layer based on a fast-switching liquid crystal cell. Using the fast-switching virtual-moving MLA, the spatial-resolution-enhanced light-field (LF) imaging system was demonstrated without a decrease in the angular sampling resolution as compared to the conventional LF imaging system comprising a passive MLA; two sets of elemental image arrays were captured quickly owing to the short switching time of the virtual-moving MLA of 450 μs. From the two captured sets of the elemental array image, four-times resolution-enhanced reconstruction images of the directional-view and depth-slice images could be obtained.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-47819-9