Depth Perception-1

Depth Perception-1 - Depth & Size Perception But First,...

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Depth & Size Perception
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But First, From the Previous Class … Color perception : Color dimensions & mixing: What wavelengths do these grapes reflect? Which is more saturated with red? or + + = with additive mixing? with subtractive mixing? ?
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What % of light do these dogs reflect (on average)? Dog A Dog B
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From the Previous Class … Color perception : Color theories: What theory attributes color vision to 3 cone pigments? What color is perceived with the following activity? What afterimage results after adapting to ? Why? Erythrolabe cone – lots of firing Cyanolabe cone – lots of firing Chlorolabe cone – very little firing
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Today’s Questions Depth perception : What is depth perception? What monocular depth cues do we use? What binocular depth cues do we use? What are the physiological correlates? Size perception : What is the relation between depth & size? What are some size illusions & their explanations?
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Figure 8.1 (a) The house is farther away than the tree, but (b) the images of points F on the house and N on the tree both fall on the two-dimensional surface of the retina, so (c) these two points, considered by themselves, do not tell us the distances of the house and the tree.
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Cue Approach to Depth Perception Oculomotor - cues based on sensing the position of the eyes and muscle tension. Convergence - inward movement of the eyes when we focus on nearby objects Accommodation - change in the shape of the lens when we focus on objects at different distances distant object near object lens flatter lens rounder
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near object distant object Convergence
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Convergence
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Cue Approach to Depth Perception - continued Monocular - cues that come from one eye Pictorial cues - sources of depth information that come from 2-D images, such as pictures Occlusion - when one object partially covers another Relative height - objects that are higher in the field of vision are more distant
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Monocular Depth Cues Pictorial depth cues : Occlusion = Nearer objects occlude distant objects
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Monocular Depth Cues Pictorial depth cues : Relative height = Below horizon, nearer objects are lower in the picture plane than distant objects Above horizon, nearer objects are higher in the picture plane than distant objects
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Pictorial Cues, cont’d Relative size - when objects are equal size, the closer one will take up more of your visual field Perspective convergence - parallel lines appear to come together in the distance Familiar size - distance information based on our knowledge of object size
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Monocular Depth Cues Pictorial depth cues : Relative size = Retinal images of nearer objects are larger than those of distant objects
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Monocular Depth Cues Pictorial depth cues : Linear perspective = Parallel lines converge with greater distance from observer Vanishing point
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Monocular Depth Cues Pictorial depth cues : Familiar size = Relative distance is influenced by knowledge about size of objects
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Name four depth cues that are contained in this scene of Tucson, Arizona.
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This note was uploaded on 11/12/2009 for the course PSY 3321 taught by Professor Ceballos during the Spring '09 term at Texas State.

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Depth Perception-1 - Depth & Size Perception But First,...

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