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 paper 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.
In this work, we aim to realize a wide viewing-angle and a space saving configuration in a projection-type integral 3D display composed of a projector and lens array. In the conventional method, for a wide viewing-angle, light rays should be incident on the lens array at a large incident angle. In order to achieve a large incident angle, projectors are installed diagonally behind the lens array. This requires a large space for projectors behind the display. We propose a projection method that realizes a wide viewing-angle using a space saving configuration in which one projector is installed behind the lens array. In the proposed configuration, two mirrors are arranged facing each other between the projector and the lens array. Light rays enter the lens array from the mirror image positions of the projector through multiple reflections between these two mirrors. The proposed method requires no projector other than the projector installed directly behind the lens array. In this way, wide viewing angle is achieved with a downsized system. First, the proposed configuration was simulated and its feasibility was evaluated. Second, based on the simulation results, the specifications of the proposed configuration were evaluated in the experiment. The actual display system was then prepared for the experiment. As a result of the simulation and experiment, a viewing-angle that requires a configuration employing three or more projectors was realized using a configuration employing one projector.
Real-time image processing at high frame rates could play an important role in various visual measurements. Such image processing can be realized by using a high-speed vision system imaging at high frame rates and having appropriate algorithms processed at high speed. In this paper, we describe two visual measurements using high-speed vision, target counting and rotation measurement. For those measurements, we propose methods utilizing unique features of our high-speed vision system. Both measurements have excellent measurement precision and high flexibility because of high-frame-rate visual observation achievable. Experimental results show the advantages of high-speed vision compared with conventional visual systems.
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