Space perception and binocular vision

10 important questions on Space perception and binocular vision

Monocular depth cue

A depth cue that is available even when the world is viewed with one eye alone.

binocular depth cue

A depth cue that relies on information from both eyes. Stereopsis is the primary example in humans, but convergence and the ability of two eyes to see more of an object than one eye sees are also binocular depth cues.

Pictorial depth cue

A cue to distance or depth used by artists to depict three-dimensional depth in two-dimensional pictures.
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Nonmetrical depth cue

A depth cue that provides information about the depth order (relative depth) but not depth magnitude (e.g., his nose is in front of his face).

relative metrical depth cue

A depth cue that could specify, for example, that object A is twice as far away as object B without providing information about the absolute distance to either A or B.

Absolute metrical depth cue

A depth cue that provides quantifiable information about distance in the third dimension (e.g., his nose sticks out 4 centimeters in front of his face).

Anamorphosis or anamorphic projection

Use of the rules of linear perspective to create a two-dimensional image so distorted that it looks correct only when viewed from a special angle or with a mirror that counters the distortion.

Corresponding retinal points

Two monocular images of an object in the world are said to fall on corresponding points if those points are the same distance from the fovea in both eyes. The two foveas are also corresponding points.

Panum’s fusional area

The region of space, in front of and behind the horopter, within which binocular single vision is possible.

Random dot stereogram (RDS)

A stereogram made of a large number (often in the thousands) of randomly placed dots. Random dot stereograms contain no monocular cues to depth. Stimuli visible stereoscopically in random dot stereograms are Cyclopean stimuli.

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