PSY280H1 Lecture Notes - Lecture 6: Euclidean Geometry, Stereopsis, Depth Perception
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Parallel lines remain parallel as they are extended in space. Objects maintain the same size and shape as they move around in space. Internal angles of a triangle always add to 180 degrees, etc. But images projected onto the retina are non-euclidean! We address this problem by using various cues. 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. Occlusion: a cue to relative depth order when, for example, one object obstructs the view of part of another object. Could be an accidental view of the shapes shown in (a), but it is much more likely that it is a generic view of (b). Nonmetrical: provides information about the depth order (relative depth) but not depth magnitude (e. g. , his nose is in front of his face).
