Ware:Vislab:CCOM Basic Vision+ The process and what stands out CH1 – CH2 + supplimentary.

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Ware:Vislab:CCOM Ware:Vislab:CCOM Basic Vision+ Basic Vision+ The process and what The process and what stands out stands out CH1 – CH2 + supplimentary
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Transcript of Ware:Vislab:CCOM Basic Vision+ The process and what stands out CH1 – CH2 + supplimentary.

Page 1: Ware:Vislab:CCOM Basic Vision+ The process and what stands out CH1 – CH2 + supplimentary.

Ware:Vislab:CCOMWare:Vislab:CCOM

Basic Vision+Basic Vision+ The process and what The process and what

stands outstands out

CH1 – CH2 + supplimentary

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Ware:Vislab:CCOMWare:Vislab:CCOM

2D Scalar

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Arctic Sea Ice Volume (1D Scalar)

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17.5K

~3K

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Ware:Vislab:CCOMWare:Vislab:CCOM

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• Weighted graph• 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

960x640 5 cm

1280x1280

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CAVE

Resolution problems Light scattering

problems

iPhone

960x640 5 cm

1280x1280128 pixels/degree

14 pixels/deg

16,000 pixels/ deg2196 pixels/ deg2

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Immersion VR

HMD + head tracking Data glove

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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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Ware:Vislab:CCOMWare:Vislab:CCOM

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Ware:Vislab:CCOMWare:Vislab:CCOM

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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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Spotfire product

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What we can easily find :CH2

Visual search depends on• Salience (low level properties)• Tuning of low level properties• Search skills (knowledge)

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V1 processing

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Pre-Attentive Processing

a

89739057092794057962976509829408028085080830802809850-802808567847298872ty458202094757720021789843890r455790456099272188897594797902855892594573979209

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Color is Pre-Attentive (Pops out)

aa

897 90570927940579629765098294080280850808 0802809850-802808567847298872ty45820209475772002178984 890r45579045609927218889759479790285589259457 979209

33

33

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Generic Pre-Attentive Experiment

a

3 6 12

Number of distractors

500

700

900 Number of irrelevant items varies

Pre-attentive 10 msec per item or better.

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Color

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Orientation

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Motion

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Size

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Simple shading

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Conjunction (does not pop out)

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Semantic Depth of Field

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Channels = perceptual dimensions

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Symbol Coding

ColorChannel

FormChannel

MotionChannel

HueSatLuminance

SizeOrientElong

VerticalHorizontalBlinking

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Relevance

Symbol design (nominal coding) Highlighting, - search guidance. Glyph design (quantititive symbols)

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Mapping data to display variablesData glyphs

Position (2) Orientation (1) Size (spatial frequency) Motion (2)++ Blinking? Color (3)

Note we have the problem of heterogeneity – There is no good solution

Star glyphMethod

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Starplot glyph

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How many dimensions?

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Surplus Data into Art?

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Symbols

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Redundant codingOutliers on feature dimensions

are more easily seen

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A symbol set designed for rapid search

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Asymmetries in search

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Highlighting methods

Add something rather than subtract something

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Motion Highlighting

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We are very sensitive to motion in theperiphery. (Peterson and Dugas, 1972)

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How to make a reminder-emergence (Hillstrom and Yanti, 1994)

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Search as a process

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Search as a process

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Heirarchical designaids search

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The process (again)

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