Basics Vision+
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Transcript of Basics Vision+
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Basics Vision+Basics Vision+
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Data Classes
Scalar Field• 1D• 2D• 3D
Vector Field• 1D• 2D• 3D
Time Varying• All of the above
Discrete• 1D• K-dimensional
Nominal• Overlapping sets of data
with multiple nominal attributes
Graph G = {V,E}• Tree• Directed acyclic• Entities and Relationships• Hyper graph
What is a map?
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Human Visual Field
aa
100
80
60
LEFT RIGHT
40
20
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Visual Angle
dr
h
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1 diopter: a lens that focuses at 1 meter.
45d Cornea
~15d Lens
d = 1/f
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Acuities
Vernier super acuity (10 sec)
Grating acuityTwo Point acuity (0.5 min)
What is the ideal resolution
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CAVE
Resolution problems Light scattering problems
iPhone
1136x640 8 cm
1280x1024
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CAVE
Resolution problems Light scattering
problems
iPhone
1280x1280140 pixels/degree
14 pixels/deg
20,000 pixels/ deg2196 pixels/ deg2
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Human Spatial Acuity
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Cutoff at 50 cycles/deg.
Receptors: 20 sec of arc Pooled over larger and larger areas 100 million receptors 1 million fibers to brain A desktop screen may have 30 pixels/cm
– need about 4 times as much. I phones better. VR displays have 5 pixels/cm
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Aliasing and Anti aliasing
Input pattern
Output pattern
Pixel matrix
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Temporal Aliasing
Human Flicker fusion 50 Hz Temporal aliasing occurs with moving
targets Must compute motion blur to fix the
problem
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Acuity Distribution
aaa
10 30 50103050
Distance from Fovea (deg.)
100
80
60
40
20
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Brain Pixels
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Visual search
a
VisualSearch orMonitoringStrategy
EyeMovementControl
Useful VisualField of View
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The Process of Visual Thinking
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