World Library  
Flag as Inappropriate
Email this Article

Kinetic depth effect

Article Id: WHEBN0008312479
Reproduction Date:

Title: Kinetic depth effect  
Author: World Heritage Encyclopedia
Language: English
Subject: Stereoscopy, Wiggle stereoscopy, Hans Wallach, Stereographer, Stereoscopic depth rendition
Publisher: World Heritage Encyclopedia

Kinetic depth effect

This animation of the Moon's libration shows the moon's spherical shape, an example of the kinetic depth effect. In this image, the shadow indicates more readily the shape of the moon, but if it wasn't present, we could perceive the spherical shape only from the motion patterns of its surface features.

In visual perception, the kinetic depth effect refers to the phenomenon whereby the three-dimensional structural form of an object can be perceived when the object is moving. In the absence of other visual depth cues, this might be the only perception mechanism available to infer the object's shape. Being able to identify a structure from a motion stimulus through the human visual system was shown by Wallach and O'Connell in the 1950s through their experiments.[1]

For example, if a shadow is cast onto a screen by a rotating wire shape, a viewer can readily perceive the shape of the structure behind the screen from the motion and deformation of the shadow.

There are two propositions as to how three-dimensional images are perceived. The experience of three-dimensional images can be caused by differences in the pattern of stimulation on the retina, in comparison to two-dimensional images. Gestalt psychologists hold the view that rules of organization must exist in accordance to the retinal projections of three-dimensional forms which happen to form three-dimensional percepts. Most retinal images of two-dimensional forms lead to two-dimensional forms in experience as well. The other deduction is related to previous experience. Unfortunately, this assumption does not explain how past experience influences perception of images. [2]

In order to model the calculation of depth values from relative movement, many efforts have been made to infer these values using other information like geometry and measurements of objects and their positions.[3] This is related to the extraction of structure from motion in computer vision. In addition, an individual's ability to realize the kinetic depth effect conclusively shows that the visual system can independently figure the structure from motion problem.[4]

As with other depth cues, the kinetic depth effect is almost always produced in combination with other effects, most notably the motion parallax effect. For instance, the rotating circles illusion[5] and the rotating dots visualization[6] (which is similar in principle to the projected wireframe demonstration mentioned above) rely strongly on the previous knowledge that objects (or parts thereof) further from the observer appear to move more slowly than those that are closer.

The kinetic depth effect can manifest independently, however, even when motion parallax is not present. An example of such a situation is the art installment "The Analysis of Beauty",[7] by the Disinformation project, created as a tribute to William Hogarth's concept of the Serpentine Line (which was presented in his homonymous book).

Hemispheric Differences

Sometimes, when looking at rotating three-dimensional silhouettes, they will suddenly appear to change the direction in which they are rotating, even though nothing about the image has changed. This sudden change is because the silhouette lack any depth cues from shading. Data from an experiment showed that subjects experienced changes more when the image was being processed by their left hemisphere which controls the right side of the visual field.[8]

See also

Further reading


  1. ^ Aloimonos J. On the kinetic depth effect. Biological cybernetics. 1989-01-01;60:445-55.
  2. ^ Wallach, H., & O'Connell, D. N. (1953). The kinetic depth effect. Journal of Experimental Psychology, 45(4), 205-217. doi:
  3. ^ Michael S. Landy (1987). "Parallel model of the kinetic depth effect using local computations".  
  4. ^ Ullman, S. (1979). The interpretation of visual motion. Cambridge, MA: MIT Press.
  5. ^ Stereokinetic Phenomenon from Michael Bach’s "Optical Illusions & Visual Phenomena"
  6. ^ George Mather. "Kinetic Depth Effect illustration". 
  7. ^ "The Analysis of Beauty", by the Disinformation project
  8. ^ Azoulai & MacLeod, Shai & Donald. "Hemispheric Differences in the Kinetic Depth Effect". Journal of Vision. Retrieved 28 July 2012. 
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.