visual perception & graphical principles seminar on information visualization daniele della...
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Visual Perception & Graphical Principles
Seminar on Information Visualization
Daniele Della Bruna
winter 2006 @ university of Fribourg
IntroductionPreattentive perception
Introduction
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
- Perception in visualization
- Power of visualization
- Color use guidelines
IntroductionPreattentive perception
Preattentive perception
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
- Eye movements take at least 200 msec to initiate
-Tasks performed in less than 200-250 msec are considered preattentive
-A limited set of visual properties are detected veryrapidly by the low-level visual system
IntroductionPreattentive perception
Preattentive perception
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
IntroductionPreattentive perception
Demo preattentive
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
- Demo
IntroductionPreattentive perception
Theories
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
-Feature integration theory: a set of feature maps ;each feature map registers in parallel activity in response to a specific feature
-Texton Theory: a group of features ; only difference intextons or in their density can be detected
-Similarity Theory: search time is based on T-N and N-N values
-Guided Search Theory: features maps filtered into multiplecategories (colourred/green/blue/yellow)
IntroductionPreattentive perception
Postattentive vision
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
-attention allow a viewer to learn what is it in a scene,but it does not allow the viewer to see the scene in a different manner
-preattentive visual representation appears to be identicalafter the viewer studied it
-What we see when confronted with a new scene dependsas much on our expectations
-an interruption in what is being seen renders us “blind” tosignificant changes
IntroductionPreattentive perception
Demo postattentive
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
IntroductionPreattentive perception
Demo postattentive
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
IntroductionPreattentive perception
Demo postattentive
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
IntroductionPreattentive perception
Not lie with visualization
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
- How data are represented visually has a powerfuleffect on how is perceived
- It can significantly influence the user’s interpretationof the data
IntroductionPreattentive perception
Demo visualization
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
IntroductionPreattentive perception
Colour use guidelines
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
- Colours can help the understanding of a graph
- 4 different colour schemes
-Qualitative-Binary-Diverging-Sequential
IntroductionPreattentive perception
Qualitative / Binary
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
-Qualitative: data of different categories are usually represented in an effective way by means of differences in hue
- Binary: A binary scheme is a qualitative scheme where there are only two categories
IntroductionPreattentive perception
Diverging / Sequential
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
- Diverging: In a diverging scheme data can be grouped in two sets that show two different trends around a balance or theshold point
-Sequential: To represent ordered data in sequential form the common recommendation is using variations in lightness or saturation of a given hue
IntroductionPreattentive perception
Combinations
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
- Finally these four possibilities can be combined among them to obtain up to 10 commendable bivariate schemes
IntroductionPreattentive perception
Problems in colour appearance
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Colour use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in colour appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
- colorblind
IntroductionPreattentive perception
Questions
Demo preattentiveTheoriesPostattentive visionDemo postattentive
Demo visualization
Demo postattentiveDemo postattentive Not lie with visualization
Color use guidelinesQualitative / BinaryDiverging / SequentialCombinationsProblems in color appearanceQuestions
Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006
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