Multiscopy
A 3D display is multiscopic if it projects more than two images out into the world, unlike conventional 3D stereoscopy, which simulates a 3D scene by displaying only two different views of it, each visible to only one of the viewer's eyes. Multiscopic displays can represent the subject as viewed from a series of locations, and allow each image to be visible only from a range of eye locations narrower than the average human interocular distance of 63 mm. As a result, not only does each eye see a different image, but different pairs of images are seen from different viewing locations.[1]
This allows the observer to view the 3D subject from different angles as they move their head, simulating the real-world depth cue of
Photographic images of this type were named parallax panoramagrams by inventor Herbert E. Ives circa 1930, but that term is strongly associated with a continuous sampling of horizontal viewpoints, captured by a camera with a very wide lens or a lens that travels horizontally during the exposure. The more recently coined term has increasingly been adopted as more accurately descriptive when referring to electronic systems that capture and display only a finite number of discrete views.
An example of a popular commercial multiscopic display is the Looking Glass Portrait from Looking Glass Factory.
Examples
Examples of multiscopic (as opposed to
- Parallax-based technologies
- parallax barriers
- lenticular 3D (using an array of very narrow cylindrical lenses)
- integral imaging (using an X–Y or "fly's-eye" array of spherical lenslets)
- Volumetric technologies:
- sweeping a projection across subsurfaces
- transparent substrates (such as "intersecting laser beams, fog layers")
- Holography (including real-time holography)
References
- ^ Douglas Lanman, Matthew Hirsch, Yunhee Kim, Ramesh Raskar. Content-adaptive parallax barriers: optimizing dual-layer 3D displays using low-rank light field factorization. Proc. of SIGGRAPH Asia 2010 (ACM Transactions on Graphics 29, 6), 2010.
- ^ "HR3D, Glasses-Free 3D Display - Camera Culture Group, MIT Media Lab".