Wave-optics-based image synthesis for super resolution reconstruction of a FZA lensless camera

被引:9
|
作者
Chen, Xiao [1 ]
Pan, Xiuxi [1 ]
Nakamura, Tomoya [1 ]
Takeyama, Saori [2 ]
Shimano, Takeshi [3 ]
Tajima, Kazuyuki [3 ]
Yamaguchi, Masahiro [1 ]
机构
[1] Tokyo Inst Technol, Sch Engn, 4259-G2-28 Nagatsuta,Midori Ku, Yokohama, Kanagawa 2268502, Japan
[2] Osaka Univ, SANKEN, 8-1 Mihogaoka, Osaka, Ibaraki 5670047, Japan
[3] Hitachi Ltd, Instrumentat Innovat Ctr, 1-280 Higashi Koigakubo, Kokubunji, Tokyo 1858601, Japan
基金
日本科学技术振兴机构;
关键词
MASK;
D O I
10.1364/OE.480552
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A Fresnel Zone Aperture (FZA) mask for a lensless camera, an ultra-thin and functional computational imaging system, is beneficial because the FZA pattern makes it easy to model the imaging process and reconstruct captured images through a simple and fast deconvolution. However, diffraction causes a mismatch between the forward model used in the reconstruction and the actual imaging process, which affects the recovered image's resolution. This work theoretically analyzes the wave-optics imaging model of an FZA lensless camera and focuses on the zero points caused by diffraction in the frequency response. We propose a novel idea of image synthesis to compensate for the zero points through two different realizations based on the linear least-mean-square-error (LMSE) estimation. Results from computer simulation and optical experiments verify a nearly two-fold improvement in spatial resolution from the proposed methods compared with the conventional geometrical-optics-based method.
引用
收藏
页码:12739 / 12755
页数:17
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