PSY280 JULY 24.docx

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PSY280 JULY 24, 2012 What is depth percetoption – ability identify distance or relative to ourselves or each other Pretty important bc allows us to orientate and act properly Projection on eyes is 2d and to perceive depth we use viusla cues Mono – 1 eye Bi – 2 eyes Are inacuuricies lead to illusions Depth - Non which ones in front of other- no quantative - Metrical is quantical in front of purse - Absolute is 1 foot Problem - Main problem same retinal image for close and far objects - Toy produce same image retinal angle image as car far away - Problem - How judge distance on 2d rep - Relies on cues Types - Mono – 1 eye – still use cues if had patch - Bi – both eyes - Mono – phys – changes eye makes changes in muscle structure convergence or divergence - Pict – look at pic perceive depth based on cues on 2d image perceive depth - Dynamic – motion of objects or obsever - Bi - Sterpsis – difference between eyes 6cm – right and left eye - Cues – have been learned over time, in front then close to us – reliable cue Accom - Bulginf or falttening of retina - Near bulge far flat - Type of info to eye , 2 paths eye on to brain and if lots of accom or flat then distance - Cue is releavent only near and far point 10 feet to 20 cm point at wgich can accomadate Vergence – mono - Con and di - Cat converge its eyes - Eyes inward to allow close object on focea - And convergence greater closer - Div – temples to far objects - Physiological cue and provides absolute Pictorial Pic - Look at phot and periceve depth - The rainy day painting - Infer depth what is further inforn Occlusion - Near objects block distant obhects - Most reliable - Junction is use of continous contour Shadows - Provide info of shape and distance - Light down makes shadow - Straight rays and produce a projection - Attached and casrs - Attached – info of shape 3d - Casts – info of depth Att - Shape - Tell if dimples or pimples light top then bulge - If opp then dimples dark top Casts - Separate shadow then oobject - Gives info of distrance greater distance then further - depth Aerial pers - When look at scene or any scene with sky - Further away bluer and blurrier - Reason is look distance more air - More air and dust greatr scattering of light - Blue light refrezacted greater degree then other wv - So percivee greater bluish tinger greater refreaction - blurry and blue bc greater refrwection - If in dry place then perceive objects closer then actually are - If foogy then perceive further away Rel size - Same size further away smaller image on retina Fam - Extension of rel size - Should be size - Smaller further closer if larger by edleson with cards - Standard cards one regular then half then half of middle or standard - Judge smallest as much further away - Cue of depth how big they should be Linear - Railroad tracks receeding into distance appear to converge and were converge is vanishing point along horizion - Cue to depth - Converge then further Texture - Smaller densly packed receed distance - Close large and dispersed - Further more dense and converge then actually are - Applied to many textures that are repetitive Height - Relkative to horizion - Closer to further away - Lower further - C further then d Picture - Umbrella cover pole occlusion - Shadows - Bluer building Dynamic Kinetic depth - Stationary observer and moving object - Closest move faster and stronger then further away - Fastest and greatest closer Motion parallax - Observer motion and object stationary - Train left, in front fix away and behind with you - Bc ffield of view shift - Info of distance Bino Stereo Disparity - Difference in bon field - Bino field is both left and right almost 180 degrees - Blue is viusla by boith eyes - Yellow is monocular field only one eye see area (about 10 percent) - Lateral eyes more of world poor depth perception bc poor bino but better monoc - Not a lot of overlap - Dif image left and right eye Contd - Corresponding retinal planes - Right and left match - Fovea is always corresponding point same place in both eyes - Non corresponding point Contd - Circular around fixation point horopter – around it have zero disparity - Outside of it have retinal disparity and non corresponding Contd - Panums also allows for szero disparity within certain distance - Greater distance from horopter is greater disparity - Ddisaroty where on riht and on left Contd - Infront produce cross disparity and cue for depth - Infron noncross disaprtiy - Closer images corssed and further uncrossed Correps - Which on right is same on left - How know this - 2 wyas Inter - Random dot - Create illusion of depth - Diffirent images in rigt and left eye - One image shifted - Dots shifted seen as floting infront - Croosed infront and uncrossed behind it Rivalry - Diff image right and left car and house what happen - Wouldn’t see interhration - But suppression of one and then shif t Phsy Phys - V1 - Most input in from area - Intergrate left and right eye - Different columns intergrate only process in v1 - Not that different in v1 - If very different – then sent to higher cortical region - V2 to crossed or uncroosed - Moving up greater complexity - V3 in bino suprresion Size and perce Sizer perception - Perception size on retinal image based on visual angle - Fare and close is stable in size - Same size Size const - Depth cues and relative size - More depth cus better accuracy - Relative size – if further away everything get smaller Hollaway - How use depth cues sit in hallway one comparison cricel another test - Comp 10 feet and test ranged from 10 to 120 feet - As circle increased d the size increades so viusla angle the same - Goal change comp to match test circle Contd - All cues - Only mono one eye - Removied peep hole Contd - Size comp increased as test - With depth perceived d increased circle increased so enlarge comparaion - Less more flat the line do not change comp bc base on visual angle Illusions size Muller - Both lines same - Same with dumblees - One reason - Length of figure Ponso Ames - This righ
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