Motion parallax is a monocular cue for relative depth perception and plays a very important role in successful navigation (Rogers and Graham 1979; Ono and Wade 2005). It is also an essential contributor to three-dimensional vision. When objects are stationed at different distances from the moving observer, objects closer to the eye appear to move faster than objects that are further away. In other words, motion parallax refers to the variance in image motion between objects at different depths. One of the reasons for this perception is that, the further away we look, the wider the visual field. Closer objects have to travel a shorter distance before they disappear from the visual field. Objects that are far away have longer distances to travel before they disappear from the visual field. Hence, the variance in the perception that objects that are further away are moving slower and the ones that are closer as moving faster.
The other important cues needed for depth perception include...
References and Readings
- Howard, I. P. (2002). Seeing in depth, vol. 1: Basic mechanisms. Toronto: University of Toronto Press.Google Scholar
- Howard, I. P., & Rogers, B. J. (1995). Binocular vision and stereopsis. New York: Oxford University Press.Google Scholar
- Julesz, B. (1971). Foundations of cyclopean perception. Chicago: University of Chicago Press.Google Scholar