An extended depth-of-field projection is needed for spatial augmented reality. However, conventional projectors are often designed with a small F/#, which causes a narrow depth-of-field.
This research presents a new system consisting of a variable focus optical path and 1000-fps 8-bit high-speed projector. This system oscillates the focal length of the lens at high speed and synchronizes it with the projection. High speed performance contributes to project clear images even under the oscillated focal length and to realize all-in-focus projections on more than 10 targets at different depths.
References
- Hongjin Xu, Lihui Wang, Satoshi Tabata, Yoshihiro Watanabe, and Masatoshi Ishikawa: Extended depth-of-field projection method using a high-speed projector with a synchronized oscillating variable-focus lens, Applied Optics, Vol.60, Issue 13, pp. 3917-3924 (2021)
- Hongjin Xu, Lihui Wang, Satoshi Tabata, Yoshihiro Watanabe, Masatoshi Ishikawa, An extended depth-of-field projection method using a high-speed projector with a synchronized oscillating variable focus lens, SPIE Photonics West 2020. (San Francisco, California, USA. 2020.02.05)/ (Poster), 2020.