Greg Francis8PSY 310: Sensory and Perceptual ProcessesPurdue UniversityBinocular vision The difference in the position of A across the twoeyes is called disparity Measured in terms of visual anglePurdue UniversityTwo views Similarly, if you look at thetree, the policeman is indifferent places for thefoveae of the left and righteyeProf. Greg Francis7PSY 310: Sensory and Perceptual ProcessesPurdue UniversityBinocular vision Suppose you look at a scene with two shapes at differentdepths You focus (converge your eyes) on object B B is in the same place on the retina for the left eye and theright eyePurdue UniversityBinocular vision Suppose you look at a scene with two shapes at differentdepths You focus (converge your eyes) on object B A is in a different place on the retina for the left eye and theright eyeProf. Greg Francis6PSY 310: Sensory and Perceptual ProcessesPurdue UniversityTwo views We noted last time that with a single view there is no way toidentify the depth of a point Most of the monocular cues work with objects, not points Motion parallax can identify the depth of a point because itincludes several different views For motion to exist, there must be more than one view Either you move Or the object moves We can get depth of a point from different kinds of views Two eyes Binocular visionPurdue UniversityBinocular vision Suppose you look at a scene with two shapes at differentdepths You focus (converge your eyes) on object BProf. Greg Francis5PSY 310: Sensory and Perceptual ProcessesPurdue UniversityMotion and depth Motion parallax is a property of physics Motion and projection on to a surface The retina A cameraPurdue UniversityMotion parallax Many organisms use motion parallax to identify depth of objects Rabbits, prairie dogs, insects, humans, robots…Prof. Greg Francis4PSY 310: Sensory and Perceptual ProcessesPurdue UniversityMotion and depth Compare the movements for near and far dotsIn the worldOn the retinaFarNearIt’s avariation ofthe retinalsize withdistancepropertyPurdue UniversityMotion and depth If you move, then the projection of light from nearby objects movesmore quickly on the retina than for far objects Motionparallax.gifProf. Greg Francis3PSY 310: Sensory and Perceptual ProcessesPurdue UniversityMotion and depth Consider a point that is closerPurdue UniversityMotion and depth Have it move the same amount in the world Notice how much it moves on the retinaProf. Greg Francis2PSY 310: Sensory and Perceptual ProcessesPurdue UniversityMotion and depth Consider a point far awayPurdue UniversityMotion and depth When it moves in the world, the point also moves on theretinaProf. Greg Francis1PSY 310: Sensory and Perceptual ProcessesPurdue UniversityBinocular cues to depthPSY 310Greg FrancisLecture 21How to find the hidden word.Purdue UniversityDepth perception You can see depth in static images with just oneeye (monocular) Pictorial cues However, motion and binocular cues generallyplay an important role in depth perception Motion parallax StereopsisProf.
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