Wheatstone correctly pointed out the advantage of having two eyes to see objects in 3D depth. Before that, people were confused, thought that having two eyes posed a problem because couldn't figure out how you could see only one image when viewing the world with two eyes. Wheatstone (1838) was first to figure this out. The amount of disparity depends on the depth (i.e., the difference in distance to the two object and the distance to the point of fixation), and hence it is a cue that the visual system uses to infer depth. As you can see, the distance between the two fingers is different in your left than in your right eye their relative positions in the two retinae are disparate.īinocular disparity is defined as the difference in the location of a feature between the right eye's and left eye's image. Fixate the more distance hand, and alternately view the scene with your left eye and then your right. Stereo Vision Stereopsis: greek for "solid sight".Ĭlose one eye, and hold up your two index fingers, one fairly close to your face and one as far as you can reach. Movement cues (parallax, kinetic depth effect).Monocular, physiological cues (blur, accommodation, etc.).Pictorial depth cues (texture, shading, perspective, etc.).binocular rivalry and the neural correlates of visual awareness.disparity selectivity of binocular neurons in V1.fusion, suppression, diplopia, binocular rivaly.random-dot stereogram and the correspondence problem.Binocular disparity, crossed and uncrossed displarity, dependence on depth and distance, horopter.Perception Lecture Notes: Depth, Size, and Shape Perception Lecture Notes: Depth, Size, and Shape Professor David Heeger What you should know about this lecture
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