Parallax scanning

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Parallax scanning depth enhancing imaging methods rely on discrete parallax differences between depth planes in a scene. The differences are caused by a parallax scan. When properly balanced (tuned) and displayed, the discrete parallax differences are perceived by the brain as depth.

A continuously moving parallax scan records a pattern of sequential parallax views on a single strip of film or video tape. The lens's optical axis sweeps in the plane of the nominal X and Y axes around the nominal optical Z axis, pivoting on the optical convergence point (out along the Z axis), so that it passes through positions having parallax in relation to the optical convergence point. The circular scanning of the lens's optical axis traces out a coaxial cone pattern with the convergence point as its apex.

Early tests revealed that the brain will translate parallax scanned information into depth information at scanning frequencies of between 3–6 Hz, and that the ideal frequency is 4.31 Hz.

Human Visual Perception

In his 1995 book, Foundations of Vision, Brian Wandell states, "

visual illusion."[1]

While it is not possible to create a stereo image on a standard display without special equipment, it is possible to create an image with enhanced texture and depth. The parallax scanning lens technology creates

autostereoscopic moving images with enhanced texture and depth on standard displays (television, movie screens and computer monitors) without the necessity of special screens or the use of viewing glasses. Images can be recorded on normal film or videotape using industry standard camera systems. The image depth enhancement is accomplished entirely by the lens using parallax scanning technology.[2]

Psycho-physical Research

It is known that the act of visual perception is a cognitive exercise and not merely a stimulus response.

stereoscopic information that is appropriately sequenced at the proper rate cannot be observed by the single eye.[7]

In August 1998, the University of Virginia—Cognitive Science Department received an Innovation Award from the Virginia Center for Innovative Technology (CIT) to fund a research project to study the perceptual aspects of parallax scanning on the human visual system. This project and its subsequent report were completed in March 1999.

The UVA report titled Perceived depth is enhanced with parallax scanning, was the first independent study of the parallax scanning technologies. Dr. Dennis Proffitt and Tom Banton's work confirm that parallax scanning enhances perceived depth in images, especially when the object depth is large (See UVA Report). The more depth in the scene, the more parallax scanning enhances its perception by a viewer on a standard television screen without the aid of special glasses.[8]

See also

References

  1. ^ Wandell, B. (1995), Foundations of Vision, Sinauer Associates, Inc.
  2. doi:10.5594/j00096
    .
  3. ^ Churchland, P. (1992), The Computational Brain, Cambridge, MA: MIT Press
  4. PMID 6051761
    .
  5. ^ Marr, D. (1982), Vision, San Francisco: W. H. Freeman
  6. ^ Jones, E.; et al. (1984). "Visual Image Depth Enhancement by Parallax Induction". Advances in Display Technology IV, SPIE Proceedings. Society of Photo-Optical Instrumentation Engineers: 16.
  7. doi:10.1016/0141-9382(86)90002-8
    .
  8. ^ Proffitt, D.; et al. (March 1999), Perceived depth is enhanced with parallax scanning, University of Virginia - Cognitive Science Department

External links

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