Advances in Visual Perception PSYC 526 Fall Profs
- Slides: 27
Advances in Visual Perception PSYC 526 Fall Profs. Fred Kingdom & Kathy Mullen
Lecture 8 “Seeing Depth” Reading Goldstein 5 th ed. , Chs. 8 & 9; 6 th ed. Ch. 7 & 9 (p 302307); 7 th ed. Ch. 8. Frisby, "Seeing with two eyes" Ch 7 in Seeing. Oxford University Press (1979).
Seeing Depth Part I Cues to depth Part II Stereopsis
Part I. Cues to depth
Position in field of view Occlusion/Interposition Object size Cues to depth Texture gradients Linear perspective Shading
Texture gradients/Perspective
Occlusion/Interposition Atmospheric: Blueing with distance
Depth from shading
Kurt Wenner
Part II. Stereopsis - Definition - Evidence for modularity - Retinal disparity - Horopters - Stereoacuity - Stereoscopes and anaglyphs - Form-from-stereopsis - Correspondence problem - Autostereograms
definition………. . Stereopsis is the means by which we determine the relative depth of objects by virtue of the fact that our two eyes view the world from a slightly different angle.
Evidence for modularity 1. Phenomenonological irreducibility 2. Stereoblindness 3. Disparity-sensitive neurones 4. Depth after-effect
Retinal disparity
more definitions……. Retinal disparity is the difference in angle subtended by the image of an object in the two eyes, relative to fixation. Stereoacuity is the minimal detectable stereoscopic depth in units of disparity. Normal = 5 -15 secs of arc; best is 2 secs.
Horopters
Wheatstone stereoscope
Principle of anaglyphs
Effect of disparity
Random-dot stereogram Figural stereogram
Random-dot stereogram Figural stereogram
Form from stereopsis Figural stereogram Random-dot-stereogram
‘False-target’ or stereo-correspondence problem
Autostereogram
Autostereogram
Marr & Poggio’s cooperative network model for solving the stereo-correspondence problem
Input stereogram Marr & Poggio’s ‘coarse-to-fine’ filtering model for solving the stereocorrespondence problem Coarsefiltered Mediumfiltered Finefiltered Zero-crossing maps
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