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VisualisierungOpen Source Tools zur Datenaufbereitung Thomas Schrefl thomas.schrefl@fhstp.ac.at
Überblick ,[object Object]
Die Psychologie des Sehens
Paraview: Visualisierung von 3D Vorgängen
Provenance: Wer Wann Wie,[object Object]
William Playfair, The Commercial and Political Atlas, 1786
Informations Wachstum
Bessere Darstellungen 1980 2007
1990: A study of the evolution of a numerically modeled severe storm http://redrock.ncsa.illinois.edu/image_89video.html
2004: Hunt for the supertwister http://access.ncsa.illinois.edu/Stories/supertwister/tornado/image_gallery.htm
Visualisierung ,[object Object]
Dann können Muster leicht erkannt werdenRauschen im Vordergrund hat weniger Auswirkung,[object Object]
1  Suche den höchsten Balken 2  Lese den Namen der Frucht
Visuelle Abfragen ,[object Object]
Augenbewegungen
MustererkennungWenn wir visuelle Abfragen besser verstehen können wir besssere Grafiken gestalten
Betrachte die Linien und BuchstabenFinde heraus, was geschrieben steht
Betrachte die GesichterInterpretiere den Gesichtsausdruck
Bottom-up und Top-down ,[object Object]
Was wir sehen hängt vom Muster auf der Leinwand(bottom-up) und der Aufmerksamkeit (top-down) ab
Top-down Effekte bestimmen wo wir hinsehen und was wir vom Bildmuster wahrnehmen,[object Object]
Hintere Hirnrinde
Feature Verarbeitung ,[object Object]
Fünf Milliarden Neuronen
verarbeiten kleine Informationspackete
Orientierung und Größe
Rot-Grün, Blau-Gelb
Bewegungsrichtungen    Das Verstehen der Feature Verarbeitung hilft Symbole zu verwenden, die hervorstechen
Pop-up Effekt
Eigenschaftskanäle
Unterscheidbarkeit ,[object Object]
Zielobjekt unterscheidet sich in mehr als einer Eigenschaft auftreten
Weniger gut Unterscheidbar
Zielobjekt unterschiedet sich nur in einer Eigenschaft
Zielobjekt ist von ähnlichen Objekten umgeben,[object Object]
Nach den Symbolen soll unabhängig voneinandergesucht werden können
In jedem Kanal können nur drei Levels unterschieden werden (drei Größen, drei Orientierungen, …),[object Object]
Zwischenstufliche Mustererkennung ,[object Object]
Das visuelle Feld wird in einzelne Muster unterteiltImplikationen für das Grafik-Design: Wie Elemente werden zusammengefügt oder isoliert?,[object Object]
(a) Direkte Anwendung für die Darstellung von Vektorfeldern (b)
ömun Visuelle Abfragen: - Wo ist die stärkste Strömung ,[object Object]
 Wo ist das Wasser am kältesten,[object Object]
Linse
Fokusiert das Bild die Netzhaut
Lichtempfindliche Kegel (3 für 3 verschiedene Fraben)Stäbchen (für schwaches Licht),[object Object]
Auflösung
Reihenfolge
Gradienten / Änderung der Werte
Farbreihenfolgen ,[object Object]
Muster in den Datenerkennen
Quantitative Zahlenwertedarstellen
Hervorhebungen: Starkes Signal in einemKanalUnterschiedzumHintergrund
Null istwichtigeZahl, verwendeeinenneutralen Wert mehrgesättigteFrabenfürWerteüber und unter null
Formenwerdendurch den LuminanzkanalvermitteltZuvieleFrabenkönnen die Forminformationzerstören,[object Object]
http://www.purveslab.net/seeforyourself/
http://www.purveslab.net/seeforyourself/
Spezielle Farben ,[object Object]
Sie treten auf, wenn ein starkes Signal auf einem Kanalauftritt und kein Signal an den anderen beiden KanälenDiese Farben werden unabhängig von der Spracheder Menschen am meisten benutzt
Erlernbarkeit ,[object Object]
Nicht zuviele Farben
Pop-up effects: Hintergrund und Nachbarn sindwichtig wenn etwas hervorstechen soll,[object Object]
Grid weniger dominant, Form der Wolke Baker, Bushell, After the storm: Considerations for information visualization,IEEE Computer Graphics and Applications 15 (1995) 12
Farben und Zeitleiste
Zusammenfassung ,[object Object]
Farbenwenige Farben, klare Reihenfolge Helligkeitskontrast für hohe Ortsauflösung,[object Object]
Colin Ware, Information Visualization, Second Edition: Perception for Design, 2004,[object Object]
http://www.purveslab.net/seeforyourself/
Paraview ,[object Object]
Einführunghttp://paraview.org/Wiki/images/6/65/ParaViewTutorial36.pdf http://www.cs.unc.edu/~taylorr/Comp715/ParaView3_2_Tutorial.html ,[object Object]

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