17.1Vis_2003

Data VisualizationData Visualization

Lecture 17Information Visualization :

Part 3

17.2Vis_2003

Sequence VisualizationSequence Visualization

Visualizing sequence of bases, or nucleotides, in DNA is a particularly challenging application

Bases are: GCAT Thanks to Netta Cohenfor these three slides

17.3Vis_2003

Walking through the Genome

Walking through the Genome

Genome sequence is visualized by ‘walking’ in north (C), south (G), east (T) and west (A) directions, according to the base that is encountered

– Walk is not random, but we don’t understand all the rules

17.4Vis_2003

Walking through the Genome in 1D

Walking through the Genome in 1D

AGCTGCGAGTCGAGTTGGCA…value

A,G purines

T,C pyrimidinesUi =

i

Ui

17.5Vis_2003

Focus and ContextFocus and Context

A recurring problem in Information Visualization is lack of screen real estate

Challenge has been addressed in some innovative ways

Want to achieve:– Focus: to see detail of immediate

interest– Context: to see the overall picture

17.6Vis_2003

Bifocal DisplayBifocal Display

Probably the first suggestion was the bifocal display of Spence and Apperley– Play Spence bifocal_lens movie

17.7Vis_2003

Bifocal DisplayBifocal Display

Implemented as an image browser that scales different areas of image in different ways

– Chris North, Univ of Maryland

17.8Vis_2003

What is the Bifocal Display Doing?

What is the Bifocal Display Doing?

Transforming the information space to the display space

– Visual transfer functions

– cf colour transfer functions in scivis

Informationspace

DisplaySpace

Normaldisplay

Informationspace

DisplaySpace

Bifocaldisplay

context

focus

17.9Vis_2003

Developing the IdeaDeveloping the Idea

Card, Robinson and McKinlay developed the idea into the ‘Perspective Wall’

17.10Vis_2003

The Perspective WallThe Perspective Wall

2D layout wrappedaround a 3D structure

Space utilisation:-detail on centrepanel 3x size ofequivalent flat wall fitting field ofview

17.11Vis_2003

Perspective WallPerspective Wall

Advantages:– User can adjust

ratio of detail to context

– Smooth animation helps user perceive object constancy

– Relationship between detail and context is consistent: objects bend around the corner

17.12Vis_2003

Perspective WallPerspective Wall

In terms of transfer function, the situation is closer to the early Spence movie

– Perspective gives smoother transition from focus to context

Informationspace

DisplaySpace

PerspectiveWall

context

focus

17.13Vis_2003

FishEye MenusFishEye Menus

Here is the same idea applied to menus

– Ben Bederson, University of Maryland

17.14Vis_2003

QuestionQuestion

Why is a magnifying glass no good for focus and context?

17.15Vis_2003

Cone TreesCone Trees

For large tree structures it is impossible to find sufficient screen space

Cone trees provide a solution

Here is a movie

http://research.compaq.com/SRC/3D-animate/conetree.html

17.16Vis_2003

Focus and Context for Volume VisualizationFocus and Context for Volume Visualization

Marcelo Cohen is studying whether we can apply focus + context ideas to volume visualization

17.17Vis_2003

Spence Attribute ExplorerSpence Attribute Explorer

Spence has also developed a tool called Attribute Explorer– Compare it with xmdvtool– Look for brushing concept– Here is the movie

17.18Vis_2003

RSVPRSVP

Recent Spence work addresses problem of browsing information spaces– Rapid Serial Visual Processing– To gain a quick view of what is

available– Distinction between browsing and

searching– Here is the movie

17.19Vis_2003

Browsing the WebBrowsing the Web

Spence has also turned his attention to browsing the web – On mobile devices!– Here is the movie

17.20Vis_2003

AcknowledgementsAcknowledgements

The movies were taken from Bob Spence’s Web Site at Imperial College