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![Page 1: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/1.jpg)
Visual Perception & Graphical Principles
Seminar on Information Visualization
Daniele Della Bruna
winter 2006 @ university of Fribourg
![Page 2: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/2.jpg)
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
![Page 3: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/3.jpg)
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
![Page 4: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/4.jpg)
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
![Page 5: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/5.jpg)
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
![Page 6: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/6.jpg)
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)
![Page 7: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/7.jpg)
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
![Page 8: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/8.jpg)
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
![Page 9: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/9.jpg)
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
![Page 10: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/10.jpg)
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
![Page 11: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/11.jpg)
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
![Page 12: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/12.jpg)
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
![Page 13: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/13.jpg)
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
![Page 14: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/14.jpg)
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
![Page 15: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/15.jpg)
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
![Page 16: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/16.jpg)
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
![Page 17: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/17.jpg)
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
![Page 18: Visual Perception & Graphical Principles Seminar on Information Visualization Daniele Della Bruna winter 2006 @ university of Fribourg.](https://reader036.fdocuments.net/reader036/viewer/2022062713/56649f445503460f94c6565f/html5/thumbnails/18.jpg)
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
?