ware:vislab:ccom basics vision+. ware:vislab:ccom data classes scalar field 1d 2d 3d vector field...

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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

Immersion VR

HMD + head tracking Data glove

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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