Depth perception

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Psy 102
Depth perception
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PartySunday March 12th, 11am--6pm111, 11th
St,Del MarBring a friend or two
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Depth cues

• Monocular
• Size (perspective)
• Covering
• Haze
• Shape from shading

• Binocular
• Accommodation
• Convergence
• Binocular disparity (stereo)

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Visual angle
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Figure 1. Relative size. A retinal image of a
small car is considered to be distant
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Figure 3. Linear perspective. Parallel lines such
as railway lines converge with increasing
distance.
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Interposition or Covering
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Figure 4. Aerial perspective. Mountains in the
distance appear more blue.
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Figure 5. Shape from shading Highlights and
shadows provide information about depth.
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Shape from Shading

• Bumps hollows
• Convex (Normal) vs. Hollow face
• We expect, therefore see, Normal face
• Moving hollow face looks rubbery
• Brain says
• What physical objsect could look convex give
  these motion signals?
• Ans Rubber convex face

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Motion and depth
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Optic flow
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Size constancyOur ability to perceive the true
physical size of objects, despite size changes in
retinal image caused by distance
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Fun with SIZE cues

• Ames Window
• Ames Room
• Patrick Hughes false-perspective paintings
• Normal Cooks knockoffs

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Thank you.