Fast focus estimation using frequency analysis in digital holography

Title
Fast focus estimation using frequency analysis in digital holography
Authors
박재형
Issue Date
2014-11
Publisher
OPTICS EXPRESS
Series/Report no.
OPTICS EXPRESS ; Vol22 no.21 Startpage 28926 Endpage 28933
Abstract
A novel fast frequency-based method to estimate the focus distance of digital hologram for a single object is proposed. The focus distance is computed by analyzing the distribution of intersections of smoothed-rays. The smoothed-rays are determined by the directions of energy flow which are computed from local spatial frequency spectrum based on the windowed Fourier transform. So our method uses only the intrinsic frequency information of the optical field on the hologram and therefore does not require any sequential numerical reconstructions and focus detection techniques of conventional photography, both of which are the essential parts in previous methods. To show the effectiveness of our method, numerical results and analysis are presented as well.
URI
https://doi.org/10.1364/OE.22.028926
http://dspace.inha.ac.kr/handle/10505/42564
ISSN
1094-4087
Appears in Collections:
College of Engineering(공과대학) > Information and Communication Engineering (정보통신공학) > Journal Papers, Reports(정보통신공학 논문, 보고서)
Files in This Item:
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