To obtain a large viewing angle in conventional projection-type integral photography frameworks, multiple projectors need to be arranged at a particular angle to a lens array. Hence, the systems require a large space. This paper proposes a system that achieves a large viewing angle in a space-saving manner by using curved mirrors that face each other. To this end, a projector is placed directly behind a lens array, and curved mirrors are installed to surround the rays from the projector. The incident angle toward the lens array increases after there are multiple reflections between the mirrors, which increases the viewing angle. In addition, it is not necessary to install the projector at an angle to the lens array, which results in a space-saving system. With the proposed method, a viewing angle of ±60 deg can be achieved.
This work is the result of collaborative research between Ishikawa Group Laboratory (University of Tokyo) and Watanabe Laboratory (Tokyo Institute of Technology).
- Masahiko Yasui, Yoshihiro Watanabe, and Masatoshi Ishikawa: Wide viewing angle with a downsized system in projection-type integral photography by using curved mirrors, Optics Express, vol. 29, No. 8, pp. 12066-12080 (2021)