title: Three dimensional measurement with an electrically tunable focused plenoptic camera.
abstract: A liquid crystal microlens array (LCMLA) with an arrayed microhole pattern electrode based on nematic liquid crystal materials using a fabrication method including traditional UV-photolithography and wet etching is presented. Its focusing performance is measured under different voltage signals applied between the electrodes of the LCMLA. The experimental outcome shows that the focal length of the LCMLA can be tuned easily by only changing the root mean square value of the voltage signal applied. The developed LCMLA is further integrated with a main lens and an imaging sensor to construct a LCMLA-based focused plenoptic camera (LCFPC) prototype. The focused range of the LCFPC can be shifted electrically along the optical axis of the imaging system. The principles and methods for acquiring several key parameters such as three dimensional (3D) depth, positioning, and motion expression are given. The depth resolution is discussed in detail. Experiments are carried out to obtain the static and dynamic 3D information of objects chosen.
authors.affiliation: National Key Laboratory of Science and Technology on Multispectral Information Processing, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Lei
authors.affiliation: National Key Laboratory of Science and Technology on Multispectral Information Processing, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Tong
authors.affiliation: National Key Laboratory of Science and Technology on Multispectral Information Processing, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Zhaowei
authors.initials: Z
authors.lastname: Xin
authors.affiliation: National Key Laboratory of Science and Technology on Multispectral Information Processing, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Wei
authors.affiliation: National Key Laboratory of Science and Technology on Multispectral Information Processing, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Xinyu
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Wuhan Product Quality Supervision and Test Institute, Wuhan 430048, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Liao
authors.affiliation: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Haiwei
authors.identifier: 000000016471801X
authors.initials: H
authors.lastname: Wang
authors.affiliation: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Changsheng
authors.initials: C
authors.lastname: Xie