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Ware:Vislab:CCOM Ware:Vislab:CCOM Basics Vision+ 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?
Human Visual Field
aa
100
80
60
LEFT RIGHT
40
20
Visual Angle
dr
h
1 diopter: a lens that focuses at 1 meter.
45d Cornea
~15d Lens
d = 1/f
Acuities
Vernier super acuity (10 sec)
Grating acuityTwo Point acuity (0.5 min)
What is the ideal resolution
CAVE
Resolution problems Light scattering problems
iPhone
1136x640 8 cm
1280x1024
CAVE
Resolution problems Light scattering
problems
iPhone
1280x1280140 pixels/degree
14 pixels/deg
20,000 pixels/ deg2196 pixels/ deg2
Human Spatial Acuity
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
Aliasing and Anti aliasing
Input pattern
Output pattern
Pixel matrix
Temporal Aliasing
Human Flicker fusion 50 Hz Temporal aliasing occurs with moving
targets Must compute motion blur to fix the
problem
Acuity Distribution
aaa
10 30 50103050
Distance from Fovea (deg.)
100
80
60
40
20
Brain Pixels
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Visual search
a
VisualSearch orMonitoringStrategy
EyeMovementControl
Useful VisualField of View
The Process of Visual Thinking
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