title: Enhancement of depth-of-field in a direct projection-type integral imaging system by a negative lens array.
abstract: We propose a method for enhancing depth-of-field, in which the spot size on a marginal depth plane is reduced. This method is implemented in a projection-type integral imaging system using a negative lens array without a diffuser. Numerical simulation results show that the spot size is merely 5.7% of that in a conventional system. Thus, the depth-of-field in the proposed system is enhanced by 17.5 times over that in a conventional system. Optical experiments confirm good agreement between the results and numerical predictions.
authors.affiliation: Institute of Modern Optics, Key Laboratory of Optical Information Science and Technology Nankai University, Ministry of Education of China, Tianjin 300071, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.forename: Xing
authors.initials: X
authors.lastname: Zhao
authors.forename: Zhiliang
authors.initials: Z
authors.lastname: Fang
authors.forename: Xiaocong
authors.initials: X
authors.lastname: Yuan