MariaLardi

Research:

Parallax is an apparent displacement or difference in the apparent position of an object viewed along two different lines of sight,

Motion parallax is a depth cue that results from our motion.  As we move, objects that are closer to us move farther across our field of view than do objects that are in the distance.

Depth perception arises from a variety of depth cues. These are typically classified into binocular cues that require input from both eyes and monocular cues that require the input from just one eye. Binocular cues include stereopsis, yielding depth from binocular vision through exploitation of parallax.

• Motion parallax – When an observer moves, the apparent relative motion of several stationary objects against a background gives hints about their relative distance. If information about the direction and velocity of movement is known, motion parallax can provide absolute depth information.
• Depth from motion – One form of depth from motion, kinetic depth perception, is determined by dynamically changing object size. As objects in motion become smaller, they appear to recede into the distance or move farther away; objects in motion that appear to be getting larger seem to be coming closer. Using kinetic depth perception enables the brain to calculate time to crash distance (aka time to collision or time to contact – TTC) at a particular velocity.
• Accommodation – This is an oculomotor cue for depth perception. When we try to focus on far away objects, the ciliary muscles stretches the eye lens, making it thinner. The kinesthetic sensations of the contracting and relaxing ciliary muscles (intraocular muscles) is sent to the visual cortex where it is used for interpreting distance/depth. Accommodation is only effective for distances less than 2 meters.

The Videos below are experimentations using Navigation outcome to show how depth perception arises from depth cues as well as the effect of navigating through a space can result to motion parallax from navigating.