Visual Perception Graphical Principles Seminar on Information Visualization

Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with visualization

Preattentive perception Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie

Demo preattentive Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie

Theories Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with

Postattentive vision Introduction Preattentive perception -attention allow a viewer to learn what is it

Demo postattentive Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie

Not lie with visualization Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive

Demo visualization Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie

Colour use guidelines Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not

Qualitative / Binary Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not

Diverging / Sequential Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not

Combinations Introduction Preattentive perception - Finally these four possibilities can be combined Demo preattentive

Problems in colour appearance Introduction Preattentive perception Demo preattentive - colorblind Theories Postattentive vision

Questions Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with

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Visual Perception & Graphical Principles Seminar on Information Visualization winter 2006 @ university of Fribourg Daniele Della Bruna

Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with visualization Demo visualization Colour use guidelines Qualitative / Binary Diverging / Sequential Combinations Problems in colour appearance Questions - Perception in visualization - Power of visualization - Color use guidelines Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006

Preattentive perception Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with visualization Demo visualization Colour use guidelines Qualitative / Binary Diverging / Sequential Combinations Problems in colour appearance Questions - 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 very rapidly by the low-level visual system Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006

Demo preattentive Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with visualization Demo visualization Colour use guidelines Qualitative / Binary Diverging / Sequential Combinations Problems in colour appearance Questions - Demo Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006

Theories Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with visualization Demo visualization Colour use guidelines Qualitative / Binary Diverging / Sequential Combinations Problems in colour appearance Questions -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 in textons 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 multiple categories (colour red/green/blue/yellow) Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006

Postattentive vision Introduction Preattentive perception -attention allow a viewer to learn what is it in a scene, Demo preattentive but it does not allow the viewer to see the scene in a Theories different manner Postattentive vision Demo postattentive -preattentive visual representation appears to be identical Demo postattentive after the viewer studied it Demo postattentive Not lie with visualization -What we see when confronted with a new scene depends Demo visualization as much on our expectations Colour use guidelines Qualitative / Binary -an interruption in what is being seen renders us “blind” to Diverging / Sequential significant changes Combinations Problems in colour appearance Questions Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006

Demo postattentive Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with visualization Demo visualization Colour use guidelines Qualitative / Binary Diverging / Sequential Combinations Problems in colour appearance Questions Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006

Not lie with visualization Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with visualization Demo visualization Colour use guidelines Qualitative / Binary Diverging / Sequential Combinations Problems in colour appearance Questions - How data are represented visually has a powerful effect on how is perceived - It can significantly influence the user’s interpretation of the data Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006

Demo visualization Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with visualization Demo visualization Colour use guidelines Qualitative / Binary Diverging / Sequential Combinations Problems in colour appearance Questions Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006

Colour use guidelines Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with visualization Demo visualization Colour use guidelines Qualitative / Binary Diverging / Sequential Combinations Problems in colour appearance Questions - Colours can help the understanding of a graph - 4 different colour schemes -Qualitative -Binary -Diverging -Sequential Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006

Qualitative / Binary Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with visualization Demo visualization Colour use guidelines Qualitative / Binary Diverging / Sequential Combinations Problems in colour appearance Questions -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 Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006

Diverging / Sequential Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with visualization Demo visualization Colour use guidelines Qualitative / Binary Diverging / Sequential Combinations Problems in colour appearance Questions - 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 Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006

Combinations Introduction Preattentive perception - Finally these four possibilities can be combined Demo preattentive among them to obtain up to 10 commendable bivariate Theories schemes Postattentive vision Demo postattentive Not lie with visualization Demo visualization Colour use guidelines Qualitative / Binary Diverging / Sequential Combinations Problems in colour appearance Questions Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006

Problems in colour appearance Introduction Preattentive perception Demo preattentive - colorblind Theories Postattentive vision Demo postattentive Not lie with visualization Demo visualization Colour use guidelines Qualitative / Binary Diverging / Sequential Combinations Problems in colour appearance Questions Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006

Questions Introduction Preattentive perception Demo preattentive Theories Postattentive vision Demo postattentive Not lie with visualization Demo visualization Color use guidelines Qualitative / Binary Diverging / Sequential Combinations Problems in color appearance Questions ? Daniele Della Bruna – Visual Perception & Graphical Principles ; Seminar winter 2006