Transcript Basics Vision+ Ware:Vislab:CCOM Data Classes  Scalar Field • 1D • 2D • 3D  Vector Field • 1D • 2D • 3D  Time Varying • All of the above What.

Basics Vision+
Ware:Vislab:CCOM
Data Classes
 Scalar Field
• 1D
• 2D
• 3D
 Vector Field
• 1D
• 2D
• 3D
 Time Varying
• All of the above
What is a map?
 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
Ware:Vislab:CCOM
Human Visual Field
100
80
60
40
20
LEFT
RIGHT
Visual Angle
1 diopter: a lens that focuses at 1 meter.
45d Cornea
~15d Lens
d = 1/f
Acuities
Vernier super acuity (10 sec)
Grating acuity
Two Point acuity (0.5 min)
What is the ideal resolution
CAVE
iPhone
1136x640 8 cm
1280x1024
 Resolution problems
 Light scattering problems
CAVE
iPhone
140 pixels/degree
1280x1280
20,000 pixels/ deg2
14 pixels/deg
196 pixels/ deg2
 Resolution problems
 Light scattering
problems
Immersion VR
 HMD + head tracking
 Data glove
Human Spatial Acuity
Cutoff at 50 cycles/deg.
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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
Pixel matrix
Output pattern
Temporal Aliasing
 Human Flicker fusion 50 Hz
 Temporal aliasing occurs with moving
targets
 Must compute motion blur to fix the
problem
Acuity Distribution
Brain Pixels
Ware:Vislab:CCOM
Ware:Vislab:CCOM
Visual search
Useful Visual
Field of View
Visual
Search or
Monitoring
Strategy
Eye
Movement
Control
The Process of Visual Thinking
Ware:Vislab:CCOM