BROWSE
Detail
Journal Article
Fast Focus Estimation Using Frequency Analysis in Digital Holography
- Authors
- Seungtaik Oh, Chi-Young Hwang, Il Kwon Jeong, Sung-Keun Lee, Jae-Hyeung Park
- Issue Date
- 2014-11
- Citation
- Optics Express, v.22, no.23, pp.28926-28933
- ISSN
- 1094-4087
- Publisher
- Optical Society of America(OSA)
- Language
- English
- Type
- Journal Article
- 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.
- KSP Keywords
- Digital hologram, Focus detection, Frequency Analysis, Frequency information, Frequency spectrum, Intrinsic frequency, Numerical results, Optical field, Spatial Frequency, Windowed Fourier transform, detection techniques
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
