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Chapter 6

Chapter 6 - Study notes

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University of Toronto Scarborough
Matthias Niemeier

CHAPTER SIX SPACE PERCEPTION AND BINOCULAR VISION Realism = a philosophical position arguing that there is a real world to sense. Positivism = philosophical position arguing that all we really have to go on is the evidence of sense, so the world might be nothing more than an elaborate hallucination. Euclidean = refers to the geometry of world. In Euclidean geometry, parallel lines remain parallel as they are extended in space, objects maintain the same size and shape as they move around in space, the internal angles of a triangle always add to 180 degrees, etc. although real world is Euclidean, geometry of retinal images of that world is non Euclidean, when the 2D world is projected onto the curved, 2D surface of the retina. We reconstruct the world from 2 non-Euclidean inputs: the 2 distinct retinal images which are always different cuz the retinas are in slightly diff places. We have 2 eyes cuz 2 is better than 1, also 2 eyes enable you to see more of the world, our visual field is limited to about 190 from left to right 110 of which is covered in both eyes. Vertically is 60 degrees up from center of gaze and 80 down. Binocular summation combination of signals from each eye in ways that make performance on many tasks better wboth eyes than one eye alone, this might be reason y our eyes moved infront. Binocular disparity = differences bw 2 retinal images of the same scene. stereopsis = ability to use binocular disparity as a cue to depth. Stereopsis is not a necessary condition for depth perception or space perception, we can see depth with one eye. But stereopsis add a richness to perception of the 3D world Depth cue = info about the 3D of visual space. Depth cues may be mono or binocular Monocular depth cue = a depth cue that is available even when the world is viewed wone eye alone. Binocular depth cue = a depth cue that relies on info from both eyes. Stereopsis is an ex MONOCULAR CUES TO 3D SPACE---OCCLUSION Occlusion = cue to relative depth order (position) of objects. This cue is present everywhere and is most reliable of all depth cues except in accidental viewpoints = viewing position that produces some regularity in visual image that is not present in the world, ie sides of 2 independent objects lining up perfectly Nonmetrical depth cue = a depth cue that provides info about the depth order, relative depth, but not depth magnitude (ie how much distance). Occlusion is nonmetrical depth cue. A absolute metrical depth cue is one that does provide quantitative info about distance in 3 dimension SIZE AND POSITION CUES Projective geometry = projective geometry describes the transformations that occur when the 3D world is projected onto a 2D surface, ex parallel lines do not converge in the world, but they do in the 2D projection. Relative size = depth cue - comparison of size b items wo knowing the absolute size of either one Texture gradient = depth cue items of the same size form smaller images when they are farther away, an array of items that change in size across the image will appear to form a surface in depth www.notesolution.com
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