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Experimental demonstration of wave-front coded imaging with a very low response of the modulation transfer function at the Nyquist frequency
Zhao, Hui1; Mi, Jiao1,2; Yu, Congcong1,2; Ge, Rui1,2; Fan, Xuewu1
Department空间光学技术研究室
2019-12-10
Source PublicationApplied Optics
ISSN1559128X;21553165
Volume58Issue:35Pages:9562-9569
Contribution Rank1
Abstract

Wave-front coding (WFC) is a well-known technique that can be used to extend the depth of field (DOF) of incoherent imaging systems. The phase masks make the optical transfer function drop significantly, and digital restoration must be used to obtain a clear image with a largely extended DOF. According to the existing literature, in order to obtain satisfactory restoration results, the optical modulation transfer function (MTF) at the Nyquist frequency is required to be bigger than 0.1, which has already become a popularly accepted design constraint. However, according to our experimental research reported in this paper, this requirement is overly strict. By assembling one already fabricated WFC lens and another camera having physically higher resolution, the MTF of the newly assembled WFC system used in the experimentation has quite a low response at its Nyquist frequency. The experimental results demonstrate that when the optical MTF value at the Nyquist frequency reaches the minimum value of about 0.05, visually satisfactory restoration results can still be obtained as long as the MTF is optimized to be highly insensitive to defocus and the corresponding SNR of the coded intermediate images goes beyond 20 dB at the same time. The experimental results indicate that the overly strict constraint could be alleviated while designing a WFC system. © 2019 Optical Society of America.

DOI10.1364/AO.58.009562
Indexed BySCI ; EI
Language英语
WOS IDWOS:000502086200010
PublisherOSA - The Optical Society
EI Accession Number20195007824196
Citation statistics
Document Type期刊论文
Identifierhttp://ir.opt.ac.cn/handle/181661/32075
Collection空间光学技术研究室
Corresponding AuthorZhao, Hui
Affiliation1.Space Optics Lab, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710019, China;
2.University of Chinese Academy of Sciences, Beijing; 100049, China
Recommended Citation
GB/T 7714
Zhao, Hui,Mi, Jiao,Yu, Congcong,et al. Experimental demonstration of wave-front coded imaging with a very low response of the modulation transfer function at the Nyquist frequency[J]. Applied Optics,2019,58(35):9562-9569.
APA Zhao, Hui,Mi, Jiao,Yu, Congcong,Ge, Rui,&Fan, Xuewu.(2019).Experimental demonstration of wave-front coded imaging with a very low response of the modulation transfer function at the Nyquist frequency.Applied Optics,58(35),9562-9569.
MLA Zhao, Hui,et al."Experimental demonstration of wave-front coded imaging with a very low response of the modulation transfer function at the Nyquist frequency".Applied Optics 58.35(2019):9562-9569.
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