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Depth Perception_REVISED

Depth Perception_REVISED - Depth& Size Perception But...

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Unformatted text preview: Depth & Size Perception 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? ? What % of light do these dogs reflect (on average)? Dog A Dog B 10-70% 80-90% From the Previous Class … • Color perception : – Color theories: • What theory attributes color vision to 3 cone pigments? • What afterimage results after adapting to – Why? Today’s Questions • Depth & Size Perception : • How can we see far into the distance based on the flat image of the retina? • Why do we see depth better with two eyes than with one eye? • Why don’t people appear to shrink in size when they walk away? The house is farther away than the tree, but the images of points F on the house and N on the tree both fall on the two- dimensional surface of the retina, so these two points, considered by themselves, do not tell us the distances of the house and the tree. 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 Convergence near object distant object Convergence 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 P ictorial A ccommodation M otion Monocular Depth Cues • Pictorial depth cues : – Occlusion = Nearer objects occlude distant objects Monocular Depth Cues • Pictorial depth cues : – Relative height = • Below horizon, low objects are near. • Above horizon, low objects are far. 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 Monocular Depth Cues • Pictorial depth cues : – Relative size = Retinal images of nearer objects are larger than those of distant objects Monocular Depth Cues • Pictorial depth cues : – Linear perspective = Parallel lines converge with greater distance from observer Vanishing point Monocular Depth Cues • Pictorial depth cues : – Familiar size = Relative distance is influenced by knowledge about size of objects Name four depth cues that are contained in this scene of Tucson, Arizona. Pictorial Cues - continued • Atmospheric perspective- distance objects are fuzzy and have a blue tint • Texture gradient- equally spaced elements are more closely packed as distance increases • Shadows- indicate where objects are located What type of depth cues are illustrated here? And here?And here?...
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Depth Perception_REVISED - Depth& Size Perception But...

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