Depth%20Cues

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Depth Cues

• What is a cue
• Independent source of information about depth
  (when interpreted)
• Cue types
• Monocular static
• Monocular dynamic
• Binocular
• Metric, relative, ordinal

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Possible Cue List

• Accomodation/
• Convergence
• Arial perspective
• Stereopsis
• Height in visual field
• Motion disparity
• Occlusion
• Relative Size
• Relative density

• Linear Perspective
• Shading/shadows
• Texture gradients
• Kinetic depth (depth from motion)
• Dynamic occlusion (accretion deletion)
• Gravity

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Range of Cue Effectiveness
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Cue strength
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Occlusion
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Relative Size
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Eye Height
a
h
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Atmospheric Perspective
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Motion Parallax
http//psych.hanover.edu/Krantz/MotionParallax/Mot
ionParallax.html
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Convergence
Known angle, inter-ocular separation, Known angle
gt Depth of fixation point
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Accommodation/Blur

1. Knowing your current focal length
2. Blur gradient

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Stereo Disparity
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Texture Gradient
Size, Shape (compression), Density
Knill, 1998
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Perspective
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Shadows/Interreflections
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Shadows
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Gravity
Acceleration profile gt Size Depth Can affect
scale of whole layout
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Cue Combination

• Weighted combination (weak fusion) of estimates
• Cooperative combination
• Disambiguation (cue promotion)
• No indendepent estimates are possible
• Suppression (Veto)

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(No Transcript)
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Whats wrong?
Ron Davis Six-Ninths Blue, 1966
Ames Room
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Quant. Immersion

• Why did we read this?
• controlled evaluation of
• performance in VR
• 2) Illustrates problems in purely
• empirical approach to quantifying cue effects
  in VR.
• 3) Cue du jour Head movements

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Problems

• Shows difficulties in direct empirical approach.
• Cant test everything
• Prediction? What prediction?
• Quant. Immersion? Hey, wait a minute. Did they
  ever measure immersion?

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Horopter