TB7 P&C Lecture 2; Depth Perception

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  • Created by: mint75
  • Created on: 18-12-15 11:34
What is linear perspective?
When items further away from the individual are smaller than those closer
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What is interposition?
When items closer to the viewer occlude those further behind
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Why are pictoral cues useful for depth perception?
They allow us to see depth without binocular disparity i.e with one eye
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How does contouring give the appearence of facial depth according to optics?
The perception of depth can be increased by artificially creating shadow and a longer optical path to edges
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What is motion parallax?
A MONOCULAR depth cue in which we view objects that are closer to us as moving faster than objects that are further away from us
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What is accomodation?
The ability to stretch and relax the lens, the degree of strain is translated into the distance of the object
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How does convergence work?
How much your eyes need to move to focus on an object (objects closer will need more movement than those further away)
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What is panums fusion area?
A narrow region on the horopter where targets falling on NON-corresponding points are fused into a SINGLE image at a depth other than the horoper
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What do targets falling on non-corresponding points produce? (Excluding panums)
Diplopia (double images)
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What happens to depth as disparity increases?
Perceived depth increases
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What is uncrossed disparity?
Objects positioned further from the fixation point on the horopter have uncrossed disparity
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What is crossed disparity?
Objects positioned closer than the fixation point on the horopter have crossed disparity
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If I closed my left eye, and the target was further than my fixation point on the horopter, which diplopic image would disappear?
Left image
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If I closed my left eye, and the target was closer than my fixation point, which diplopic image would disappear?
Right image
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If I was looking at two objects 1 metre away, what is the minimum distance I can tell which is closer to me?
1mm
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In stereopsis, what happens when objects are too far away?
Disparity becomes too small, depth cannot be inferred
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In stereopsis, what happens when objects are too close?
Double vision (diplopia)
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How do random dot stereograms show how stereopsis works re; binocular disparity?
Disparity and depth precede edge extraction in RDS. Because some dots are shifted laterally with respect to others, these dots in the displaced square do not fall on corresponding points on both eyes --> they have disparity
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How do disparity-selective cells operate?
The seperation between the receptive field centers (relative to the fovea of each eye) of binocular cells in each eye defines the V1 cells preferred disparity
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How do autostereograms demonstrate disparity-selectivity?
The picture appears superimposed with itself with an offset, the cells find matches in nearby repeated patterns. To view the image as 3D, eyes must converge at a diff plane of depth to the picture.
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How do autostereograms differ from normal stereograms?
The two pictures are superimposed rather than adjacent
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Other cards in this set

Card 2

Front

What is interposition?

Back

When items closer to the viewer occlude those further behind

Card 3

Front

Why are pictoral cues useful for depth perception?

Back

Preview of the front of card 3

Card 4

Front

How does contouring give the appearence of facial depth according to optics?

Back

Preview of the front of card 4

Card 5

Front

What is motion parallax?

Back

Preview of the front of card 5
View more cards

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