Exploratory visualization based on

multidimensional transfer functions and star coordinates

Alex Laier Bordignon, Rener Castro, Hélio Lopes, Thomas Lewiner and Geovan TavaresDepartment of Mathematics – PUC-Rio

2/12 Introduction/MotivationIntroduction/Motivation

How to analize multi-dimensional data in 2D ?

3/12 Star CoordinatesStar Coordinates

4/12

Star coordinatesStar coordinatesanalysisanalysis

1) project the points

2) generate the density map

5/12 Interactive axis choiceInteractive axis choice

6/12 Giving weight to an axisGiving weight to an axis

7/12

Multidimensional Multidimensional transfer functionstransfer functions

Six dimensional space

Map to color spaceTransfer function

8/12Real time feedback

Painting the clusters,interactively building a

transfer function

9/12 ResultsResults

10/12 ResultsResults

11/12 ResultsResults

12/12 Next stepsNext steps

Automatic cluster detection GPU

Improved paint toolsBest projection computation

Thanks for yourThanks for yourattention!attention!

http://www.mat.puc-rio.br/~alexlaierhttp://www.matmidia.mat.puc-rio.br/