A compressive light field projection system

Abstract

Figure 1: Compressive light field projection for glasses-free 3D display. The system comprises a single light field projector and a completely passive screen. The angular range of the light field emitted from the projector is limited to the size of the projection lens aperture, hence very small. Keplerian telescopes inspire our screen design-the angular range of incident light is expanded for an observer on the other side, creating a field of view that is suitable for glasses-free 3D display. A prototype projector was implemented from scratch using two high-speed spatial light modulators (SLMs); a prototype screen was fabricated from two lenticular sheets with different focal lengths, mounted backto-back. With the implemented system, we achieve high-rank light field synthesis (center) for human observers with a critical flicker fusion threshold that is smaller than the product of the SLM refresh rates and the rank of the synthesized light field. Note that color results above are composited from multiple images captured from our grayscale prototype. AbstractFor about a century, researchers and experimentalists have strived to bring glasses-free 3D experiences to the big screen. Much progress has been made and light field projection systems are now commercially available. Unfortunately, available display systems usually employ dozens of devices making such setups costly, energy inefficient, and bulky. We present a compressive approach to light field synthesis with projection devices. For this purpose, we propose a novel, passive screen design that is inspired by angle-expanding Keplerian telescopes. Combined with high-speed light field projection and nonnegative light field factorization, we demonstrate that compressive light field projection is possible with a single device. We build a prototype light field projector and angle-expanding screen from scratch, evaluate the system in simulation, present a variety of results, and demonstrate that the projector can alternatively achieve super-resolved and high dynamic range 2D image display when used with a conventional screen.

Recent Advances in Projection Mapping Algorithms, Hardware and Applications

“…The projected images then illuminate a rear projection screen with microoptical features, which is mechanically translated to control the propagation direction of the images. A compressive light field projection system was also proposed [HWR14]. The system consists of a high-speed, LCoS-based dual layer light field projector and a passive angle-expanding screen.…”

The light field stereoscope

“…These distortions are corrected by interactively adjusting the distortion parameters and performing an inverse distortion of the light field as discussed in Section 4.3. The diffraction blur observed on the rear display panel is accounted for and partially corrected in the solver (see [Hirsch et al 2014] supplemental material for more details). However, image degradation for farther objects is inevitable due to diffraction blur.…”

Active One-Shot Scan for Wide Depth Range Using a Light Field Projector Based on Coded Aperture

“…However, as described in the introduction, a light field projector, which cannot be modeled by central projection, has not been utilized for active stereo systems yet. In terms of system setup, several systems have been proposed [9,15,7]. Jurik et al proposed a method using a large number of laser projectors to construct a light field directly onto the human retina [9].…”

“…One severe problem of these methods is that they require many laser projectors for the system. Hirsch et al proposed a method using lenticular lenses inside the optics of a video projector [7]. However, the resolution of the system tends to be low and only a narrow angle of light field can be constructed.…”