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Space Perception- one.doc

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Psychology 2015A/B
Stephen Lupker

Space Perception -retina lacks distance and direction 3 cues! Monocular, muscular, binocular 1. monocular cue (pictoral depth cue) -looking at realistic painting : easy to perceive spatial relationship among the item portrayed -impression of the relative distance- set of cues: monocular cues (not only appear in picture- but available with one -impression of the relative distance- set of cues: monocular cues (not only appear in picture- but available with one eye closed -image on retina=2D -vision=light reflected off an object- on to the observer’s eye -other depth cues- light interacting with objects+ geometry a) interposition: a nearer object blocks the view of a more distant one *cue for relative depth only! Cant tell how far away A is from B b) retina image size: object moves further away- begins to diminish *perceiving relative distance c) linear perspective: feeling of depth -vanishing point 3D, linear converger objects become more distant (railroad tracks) d) texture gradient: any collection of objects in the visual image and the gradient is the change in relative size and conpactness. The more distant parts of a texture have smaller elements that are more densely packed together e) height in the plane/ relative height: an object is relative to the horizon line -objects closer to the horizon seem further away (moon- Galanta 1973) f) shadowing: particular pattern of shadow can provide info about the relative shape of solid objects -if light comes from above, the lower part of an ingoing dent or dimple will catch more light, whereas the upper partwill be in relative shadow g) relative brightness: brighter things appear closer -light from a more distant object must travel through the atmosphere for a greater distance and may be subject to increased absorption or scattering of the light by particles in the air -more distant objects appear less bright -scattering of light= reduction of relative contrast h) aerial perspective (large particles) -air is filed with light-absorbing and light-scattering particles even on the clearest of days -as light passes through air some of it is absorbed and other light is scattered by the minute particles of dust and moisture -large particles: scatter light uniformly, causing a uniform distribution of light or a blurring of the object -aerial perspective: image of a very distant object will be slightly bluer in hue and hazier than closer images that are the same colour because shorter wavelengths (blue) are scatter
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