Open AccessFocal stack camera in all-in-focus imaging via an electrically tunable liquid crystal lens doped with multi-walled carbon nanotubes
Author(s) -
Hui Li,
Jing Peng,
Fan Pan,
Yuntao Wu,
Yanduo Zhang,
Xiaolin Xie
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.012441
Subject(s) - focal length , optics , lens (geology) , materials science , stack (abstract data type) , focus (optics) , liquid crystal , carbon nanotube , camera lens , depth of field , image sensor , optoelectronics , computer science , physics , nanotechnology , programming language
A focal stack camera, based on an electrically tunable-focusing liquid crystal (LC) lens doped with multi-walled carbon nanotubes, is proposed to generate a single all-in-focus image of a 3D scene without depth map in a relatively short time. Focal sweep strategy of the camera is devised. Both its depth of field (DOF) and focal sweep speed are analyzed and deduced. Nano doping method is adopted to improve electro-optical features of the LC lens. To efficiently produce all-in-focus image, a weighted average algorithm for all images in the focal stack is utilized. The experiments show that the result is a high contrast at sensor resolution. It is greatly potential in optical compact 3D imaging system.