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R. Rao and S. K. Card Present by Tao Zhan

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The Table Lens: Merging Graphical and Symbolic Representations in an Interactive Focus + Context Visualization for Tabular Information. R. Rao and S. K. Card Present by Tao Zhan. Focus + Context (Fisheye). Motivation

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slide1

The Table Lens: Merging Graphical and Symbolic Representations in an Interactive Focus + Context Visualization for Tabular Information

R. Rao and S. K. Card

Present by Tao Zhan

focus context fisheye
Focus + Context (Fisheye)
  • Motivation
    • a view of the whole data available, while pursuing detail analysis of a part of it
    • Problems in overview + detail: visual search and working memory consequences degrade performance
    • user’s interest in detail fall away from the object of attention in a systematic way
focus context continue
Focus + Context (Continue)
  • Basic Idea
    • detail information and relevant context overview are combined within a single (dynamic) display
    • DOI: a metric that is the sum of a priori measure of importance and distance from the point of interest
    • method of reduction of information for the peripheral, contextual area
focus context continue1
Focus + Context (Continue)
  • Key factors
    • zoom factor
    • focus/context space ratio
    • whether the zoom factor is a step function or continuous function
    • whether the fisheye effect is obtained by geometrical distortion, elision, or semantic scaling
table lens
Table Lens
  • Motivated by the particular nature of tables
  • Distort table without bending any rows or columns
  • Distortion in each of the two dimensions is independent from the other

G

H

4

5

6

distortion function framework
Distortion Function Framework
  • Each dimension has a block pulse DOI
  • Mapping from uniformly distributed cell to physical location
  • Multiple focal areas and Multiple focal levels are possible
interactive manipulation of focus
Interactive Manipulation of Focus
  • Zoom
  • Adjust
  • Slide
  • Combined
graphical mapping scheme
Graphical Mapping Scheme
  • Value
  • Value Type
  • Region Type
  • Cell Size
  • User Choice
  • Spotlighting
examples conclusion
Examples & Conclusion
  • Examples
  • Strength and Advantage
    • supports effective interaction with much larger tables than conventional one (68,400 V.S. 660)
    • graphical representations make it easy to view patterns for cell value
    • Suitable for large dimensional data and reveal correlation and patterns between them
critique
Critique
  • Zoom Factor may be too big
  • Nominal variables with large domain are hard to present graphically
  • Search is not trivial in Table Lens
favorite sentence
Favorite Sentence
  • Always take flight to where there is a free view over the whole single great problem, even if this view is still not a clear one.