InfoVis:Wiki - User contributions [en]

File:Digram new.gif

2009-01-14T23:00:16Z

Farukp: New page: == Summary == == Copyright status == == Source ==

== Summary ==

== Copyright status ==

== Source ==

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 3

2009-01-14T15:16:22Z

Farukp:

== Aufgabenstellung ==
[http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/infovis_ue_aufgabe3.html Beschreibung der Aufgabe 3]

=== Zu beurteilende Grafik ===
[[Image:Klimafaktor-vieh die-zeit 04-2007.jpg|600px]] 
Treibhausgas-Emissionen durch tierische Gase und Dung in den Weltregionen

== Critical comments ==

===Interpreting the Data===

* In order to interpret the graphic we first wanted to know what kind of information should be compared to each other. We found out that the main statement of the graphic is not perceptible out of the design. There could be two different ways of interpreting the data:
# A comparison of the amount of emission of greenhouse gas between the different kinds of keeping inside a country
# A comparison of the amount of emission of greenhouse gas per keeping between all countries
* Because there are no scales it is hard to estimate how much tons of gas there are emitted there's only mentioned the totaling amount of 150 million tons.
* It is hard to determine which countries are combinded in a region especially in Asia.
* There is no explanation in the legend that tells us what an empty entry in a table means. It could mean that there is no emission because of the absence of the kind of keeping or it could mean that there is no data for this kind of keeping.
* A comparison of the emission of greenhouse gas between the animals is difficult when there are many different animals in a region.
* It is very disturbing for interpreting the data that the bars are placed at a different height.

===Data-Ink Ratio===

According to E. Tufte the data-ink ratio can be computed as follows: (data-ink) / (all-ink used to print the graphic) = data-ink-ratio. This means that you should only display significant data in a graphic.

* In our opinion it is a decorative idea to use a map of the world for displaying the data but not a good one. This kind of style is disturbing the because it prescinds from the relevant information.

===Visual Clutter===

====Color====

* The colors used for the world map are very hard to distinguish and that's why it's hard to determine which countries are related to which table.
* It's difficult to identify the different kinds of animals when there is much data in a table especially when dark blue, blue and green are close together.

====Legend====

* The legend is scattered all over the graphic which disturbes reading it.
* The largest font size is used to display the headline that draws off the attention.

== Adapted graphic ==

[[Image:diagramm_20090114_repair.gif|950px]]

== Adaptions ==
* With the improvement, we delivered an other kind of graphic presentation of the data. The overview has been improved, and the comparison beetween the different regions is now much easier. The new solution is a Bar chart divided into three main categories: Weidehaltung / Weide u. Stall / Stallhaltung.
* All non-data ink was removed. The Map has been removed due to the inconsistent amount of detail. The user is now not distracted by the graphic and can concentrate on the comparison of the data.
* Due to the new improved presentation of data, it is easier for the viewer to compare the amount of emission of greenhouse gas. Now all Data is lined up in one row, and is therefor easier to evaluate.
* Because of the low-detail graphic, the Data has been transfered in regions.
* The regions, where there is no data available have been made transparent to indicate, that there is no data availible, but that the region is still there to compare. If these parties have been removed, the user would lose the overview over all regions.
* The bars are vertically oriented in order to allow easier comparison of data.
* The vertical scale is the same in all three charts in order to enhance the relation between the groups and regions

The overall change of the presentation style is a better solution for the comparison of this kind of data.

Correction:

* The Diagramm has been changed in order to make it more clear and legible. The Bars are bigger and now every respresentation of a branch has a Legend printed on the bar in order for the viewer to recognize this easier.
* The Y-Axis has been labeled.
* Red color has been removed and replaced by a gentle yellow.
* The Graphic now has a clear Label and description. The source has also been added.
* ’It is very disturbing for interpreting the data that the tables are placed at a different height.’ > The Problem with the old Graphic was, that the bars have been places in different positions in the graphic. Therefor the comparison was not given. The viewer can't compare two bars if their origin is not at the same hight.
* The wrong labeling of bars, tables, etc. has been corrected.

== Links ==

* [[Teaching:TUW_-_UE_InfoVis_WS_2008/09|InfoVis:Wiki UE Homepage]]

* [http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/ UE InfoVis]

* [[Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05|Gruppe 05]]

==References==

*[Tufte et al., 1999] E. Tufte Design Principle Project: The Visual Display of Quantitative Information, Retrieved at: December 08, 2008. http://ldt.stanford.edu/ldt1999/Students/mizuno/Portfolio/Work/reports/tufte/ed229c-tufte-outline.html
*[Few, 2004a] Show Me the Numbers: Designing Tables and Graphs to Enlighten, Analytics Press, 2004, Chapter 7 - General Design for Communication.
*[Few, 2004b] Elegance Through Simplicity Article about redesigning graphs . Retrieved at: December 08, 2008. http://www.intelligententerprise.com/showArticle.jhtml;jsessionid=N2ATDQWY5VYKSQSNDBGCKHSCJUMEKJVN?articleID=49400920

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 3

2009-01-14T14:58:26Z

Farukp:

== Aufgabenstellung ==
[http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/infovis_ue_aufgabe3.html Beschreibung der Aufgabe 3]

=== Zu beurteilende Grafik ===
[[Image:Klimafaktor-vieh die-zeit 04-2007.jpg|600px]] 
Treibhausgas-Emissionen durch tierische Gase und Dung in den Weltregionen

== Critical comments ==

===Interpreting the Data===

* In order to interpret the graphic we first wanted to know what kind of information should be compared to each other. We found out that the main statement of the graphic is not perceptible out of the design. There could be two different ways of interpreting the data:
# A comparison of the amount of emission of greenhouse gas between the different kinds of keeping inside a country
# A comparison of the amount of emission of greenhouse gas per keeping between all countries
* Because there are no scales it is hard to estimate how much tons of gas there are emitted there's only mentioned the totaling amount of 150 million tons.
* It is hard to determine which countries are combinded in a region especially in Asia.
* There is no explanation in the legend that tells us what an empty entry in a table means. It could mean that there is no emission because of the absence of the kind of keeping or it could mean that there is no data for this kind of keeping.
* A comparison of the emission of greenhouse gas between the animals is difficult when there are many different animals in a region.
* It is very disturbing for interpreting the data that the tables are placed at a different height.

===Data-Ink Ratio===

According to E. Tufte the data-ink ratio can be computed as follows: (data-ink) / (all-ink used to print the graphic) = data-ink-ratio. This means that you should only display significant data in a graphic.

* In our opinion it is a decorative idea to use a map of the world for displaying the data but not a good one. This kind of style is disturbing the because it prescinds from the relevant information.

===Visual Clutter===

====Color====

* The colors used for the world map are very hard to distinguish and that's why it's hard to determine which countries are related to which table.
* It's difficult to identify the different kinds of animals when there is much data in a table especially when dark blue, blue and green are close together.

====Legend====

* The legend is scattered all over the graphic which disturbes reading it.
* The largest font size is used to display the headline that draws off the attention.

== Adapted graphic ==

[[Image:diagramm_20090114_repair.gif|950px]]

== Adaptions ==
* With the improvement, we delivered an other kind of graphic presentation of the data. The overview has been improved, and the comparison beetween the different regions is now much easier. The new solution is a Bar chart divided into three main categories: Weidehaltung / Weide u. Stall / Stallhaltung.
* All non-data ink was removed. The Map has been removed due to the inconsistent amount of detail. The user is now not distracted by the graphic and can concentrate on the comparison of the data.
* Due to the new improved presentation of data, it is easier for the viewer to compare the amount of emission of greenhouse gas. Now all Data is lined up in one row, and is therefor easier to evaluate.
* Because of the low-detail graphic, the Data has been transfered in regions.
* The regions, where there is no data available have been made transparent to indicate, that there is no data availible, but that the region is still there to compare. If these parties have been removed, the user would lose the overview over all regions.
* The bars are vertically arranged in order to allow easier comparison of data.
* The vertical scale is the same in all three charts in order to enhance the relation between the groups and regions

The overall change of the presentation style is a better solution for the comparison of this kind of data.

== Links ==

* [[Teaching:TUW_-_UE_InfoVis_WS_2008/09|InfoVis:Wiki UE Homepage]]

* [http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/ UE InfoVis]

* [[Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05|Gruppe 05]]

==References==

*[Tufte et al., 1999] E. Tufte Design Principle Project: The Visual Display of Quantitative Information, Retrieved at: December 08, 2008. http://ldt.stanford.edu/ldt1999/Students/mizuno/Portfolio/Work/reports/tufte/ed229c-tufte-outline.html
*[Few, 2004a] Show Me the Numbers: Designing Tables and Graphs to Enlighten, Analytics Press, 2004, Chapter 7 - General Design for Communication.
*[Few, 2004b] Elegance Through Simplicity Article about redesigning graphs . Retrieved at: December 08, 2008. http://www.intelligententerprise.com/showArticle.jhtml;jsessionid=N2ATDQWY5VYKSQSNDBGCKHSCJUMEKJVN?articleID=49400920

File:Diagramm 20090114 repair.gif

2009-01-14T14:57:26Z

Farukp: Aufgabe 3 Repaired Diagramm: Klimafaktor Vieh

== Summary ==
Aufgabe 3 Repaired Diagramm: Klimafaktor Vieh
== Copyright status ==

== Source ==

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 3

2009-01-14T14:56:49Z

Farukp:

== Aufgabenstellung ==
[http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/infovis_ue_aufgabe3.html Beschreibung der Aufgabe 3]

=== Zu beurteilende Grafik ===
[[Image:Klimafaktor-vieh die-zeit 04-2007.jpg|600px]] 
Treibhausgas-Emissionen durch tierische Gase und Dung in den Weltregionen

== Critical comments ==

===Interpreting the Data===

* In order to interpret the graphic we first wanted to know what kind of information should be compared to each other. We found out that the main statement of the graphic is not perceptible out of the design. There could be two different ways of interpreting the data:
# A comparison of the amount of emission of greenhouse gas between the different kinds of keeping inside a country
# A comparison of the amount of emission of greenhouse gas per keeping between all countries
* Because there are no scales it is hard to estimate how much tons of gas there are emitted there's only mentioned the totaling amount of 150 million tons.
* It is hard to determine which countries are combinded in a region especially in Asia.
* There is no explanation in the legend that tells us what an empty entry in a table means. It could mean that there is no emission because of the absence of the kind of keeping or it could mean that there is no data for this kind of keeping.
* A comparison of the emission of greenhouse gas between the animals is difficult when there are many different animals in a region.
* It is very disturbing for interpreting the data that the tables are placed at a different height.

===Data-Ink Ratio===

According to E. Tufte the data-ink ratio can be computed as follows: (data-ink) / (all-ink used to print the graphic) = data-ink-ratio. This means that you should only display significant data in a graphic.

* In our opinion it is a decorative idea to use a map of the world for displaying the data but not a good one. This kind of style is disturbing the because it prescinds from the relevant information.

===Visual Clutter===

====Color====

* The colors used for the world map are very hard to distinguish and that's why it's hard to determine which countries are related to which table.
* It's difficult to identify the different kinds of animals when there is much data in a table especially when dark blue, blue and green are close together.

====Legend====

* The legend is scattered all over the graphic which disturbes reading it.
* The largest font size is used to display the headline that draws off the attention.

== Adapted graphic ==

[[Image:diagramm_20090114_repair.gif|800px]]

== Adaptions ==
* With the improvement, we delivered an other kind of graphic presentation of the data. The overview has been improved, and the comparison beetween the different regions is now much easier. The new solution is a Bar chart divided into three main categories: Weidehaltung / Weide u. Stall / Stallhaltung.
* All non-data ink was removed. The Map has been removed due to the inconsistent amount of detail. The user is now not distracted by the graphic and can concentrate on the comparison of the data.
* Due to the new improved presentation of data, it is easier for the viewer to compare the amount of emission of greenhouse gas. Now all Data is lined up in one row, and is therefor easier to evaluate.
* Because of the low-detail graphic, the Data has been transfered in regions.
* The regions, where there is no data available have been made transparent to indicate, that there is no data availible, but that the region is still there to compare. If these parties have been removed, the user would lose the overview over all regions.
* The bars are vertically arranged in order to allow easier comparison of data.
* The vertical scale is the same in all three charts in order to enhance the relation between the groups and regions

The overall change of the presentation style is a better solution for the comparison of this kind of data.

== Links ==

* [[Teaching:TUW_-_UE_InfoVis_WS_2008/09|InfoVis:Wiki UE Homepage]]

* [http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/ UE InfoVis]

* [[Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05|Gruppe 05]]

==References==

*[Tufte et al., 1999] E. Tufte Design Principle Project: The Visual Display of Quantitative Information, Retrieved at: December 08, 2008. http://ldt.stanford.edu/ldt1999/Students/mizuno/Portfolio/Work/reports/tufte/ed229c-tufte-outline.html
*[Few, 2004a] Show Me the Numbers: Designing Tables and Graphs to Enlighten, Analytics Press, 2004, Chapter 7 - General Design for Communication.
*[Few, 2004b] Elegance Through Simplicity Article about redesigning graphs . Retrieved at: December 08, 2008. http://www.intelligententerprise.com/showArticle.jhtml;jsessionid=N2ATDQWY5VYKSQSNDBGCKHSCJUMEKJVN?articleID=49400920

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 3

2008-12-09T22:15:48Z

Farukp:

== Aufgabenstellung ==
[http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/infovis_ue_aufgabe3.html Beschreibung der Aufgabe 3]

=== Zu beurteilende Grafik ===
[[Image:Klimafaktor-vieh die-zeit 04-2007.jpg|600px]] 
Treibhausgas-Emissionen durch tierische Gase und Dung in den Weltregionen

== Critical comments ==

===Interpreting the Data===

* In order to interpret the graphic we first wanted to know what kind of information should be compared to each other. We found out that the main statement of the graphic is not perceptible out of the design. There could be two different ways of interpreting the data:
# A comparison of the amount of emission of greenhouse gas between the different kinds of keeping inside a country
# A comparison of the amount of emission of greenhouse gas per keeping between all countries
* Because there are no scales it is hard to estimate how much tons of gas there are emitted there's only mentioned the totaling amount of 150 million tons.
* It is hard to determine which countries are combinded in a region especially in Asia.
* There is no explanation in the legend that tells us what an empty entry in a table means. It could mean that there is no emission because of the absence of the kind of keeping or it could mean that there is no data for this kind of keeping.
* A comparison of the emission of greenhouse gas between the animals is difficult when there are many different animals in a region.
* It is very disturbing for interpreting the data that the tables are placed at a different height.

===Data-Ink Ratio===

According to E. Tufte the data-ink ratio can be computed as follows: (data-ink) / (all-ink used to print the graphic) = data-ink-ratio. This means that you should only display significant data in a graphic.

* In our opinion it is a decorative idea to use a map of the world for displaying the data but not a good one. This kind of style is disturbing the because it prescinds from the relevant information.

===Visual Clutter===

====Color====

* The colors used for the world map are very hard to distinguish and that's why it's hard to determine which countries are related to which table.
* It's difficult to identify the different kinds of animals when there is much data in a table especially when dark blue, blue and green are close together.

====Legend====

* The legend is scattered all over the graphic which disturbes reading it.
* The largest font size is used to display the headline that draws off the attention.

== Adapted graphic ==

[[Image:diagramm0426716.gif|800px]]

== Adaptions ==
* With the improvement, we delivered an other kind of graphic presentation of the data. The overview has been improved, and the comparison beetween the different regions is now much easier. The new solution is a Bar chart divided into three main categories: Weidehaltung / Weide u. Stall / Stallhaltung.
* All non-data ink was removed. The Map has been removed due to the inconsistent amount of detail. The user is now not distracted by the graphic and can concentrate on the comparison of the data.
* Due to the new improved presentation of data, it is easier for the viewer to compare the amount of emission of greenhouse gas. Now all Data is lined up in one row, and is therefor easier to evaluate.
* Because of the low-detail graphic, the Data has been transfered in regions.
* The regions, where there is no data available have been made transparent to indicate, that there is no data availible, but that the region is still there to compare. If these parties have been removed, the user would lose the overview over all regions.
* The bars are vertically arranged in order to allow easier comparison of data.
* The vertical scale is the same in all three charts in order to enhance the relation between the groups and regions

The overall change of the presentation style is a better solution for the comparison of this kind of data.

== Links ==

* [[Teaching:TUW_-_UE_InfoVis_WS_2008/09|InfoVis:Wiki UE Homepage]]

* [http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/ UE InfoVis]

* [[Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05|Gruppe 05]]

==References==

*[Tufte et al., 1999] E. Tufte Design Principle Project: The Visual Display of Quantitative Information, Retrieved at: December 08, 2008. http://ldt.stanford.edu/ldt1999/Students/mizuno/Portfolio/Work/reports/tufte/ed229c-tufte-outline.html
*[Few, 2004a] Show Me the Numbers: Designing Tables and Graphs to Enlighten, Analytics Press, 2004, Chapter 7 - General Design for Communication.
*[Few, 2004b] Elegance Through Simplicity Article about redesigning graphs . Retrieved at: December 08, 2008. http://www.intelligententerprise.com/showArticle.jhtml;jsessionid=N2ATDQWY5VYKSQSNDBGCKHSCJUMEKJVN?articleID=49400920

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 3

2008-12-09T22:12:26Z

Farukp:

== Aufgabenstellung ==
[http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/infovis_ue_aufgabe3.html Beschreibung der Aufgabe 3]

=== Zu beurteilende Grafik ===
[[Image:Klimafaktor-vieh die-zeit 04-2007.jpg|600px]] 
Treibhausgas-Emissionen durch tierische Gase und Dung in den Weltregionen

== Critical comments ==

===Interpreting the Data===

* In order to interpret the graphic we first wanted to know what kind of information should be compared to each other. We found out that the main statement of the graphic is not perceptible out of the design. There could be two different ways of interpreting the data:
# A comparison of the amount of emission of greenhouse gas between the different kinds of keeping inside a country
# A comparison of the amount of emission of greenhouse gas per keeping between all countries
* Because there are no scales it is hard to estimate how much tons of gas there are emitted there's only mentioned the totaling amount of 150 million tons.
* It is hard to determine which countries are combinded in a region especially in Asia.
* There is no explanation in the legend that tells us what an empty entry in a table means. It could mean that there is no emission because of the absence of the kind of keeping or it could mean that there is no data for this kind of keeping.
* A comparison of the emission of greenhouse gas between the animals is difficult when there are many different animals in a region.
* It is very disturbing for interpreting the data that the tables are placed at a different height.

===Data-Ink Ratio===

According to E. Tufte the data-ink ratio can be computed as follows: (data-ink) / (all-ink used to print the graphic) = data-ink-ratio. This means that you should only display significant data in a graphic.

* In our opinion it is a decorative idea to use a map of the world for displaying the data but not a good one. This kind of style is disturbing the because it prescinds from the relevant information.

===Visual Clutter===

====Color====

* The colors used for the world map are very hard to distinguish and that's why it's hard to determine which countries are related to which table.
* It's difficult to identify the different kinds of animals when there is much data in a table especially when dark blue, blue and green are close together.

====Legend====

* The legend is scattered all over the graphic which disturbes reading it.
* The largest font size is used to display the headline that draws off the attention.

== Adapted graphic ==

[[Image:diagramm0426716.gif|800px]]

== Adaptions ==
* With the improvement, we delivered an other kind of graphic presentation of the data. The overview has been improved, and the comparison beetween the different regions is now much easier. The new solution is a Bar chart divided into three main categories: Weidehaltung / Weide u. Stall / Stallhaltung.
* All non-data ink was removed. The Map has been removed due to the inconsistent amount of detail. The user is now not distracted by the graphic and can concentrate on the comparison of the data.
* Due to the new improved presentation of data, it is easier for the viewer to compare the amount of emission of greenhouse gas. Now all Data is lined up in one row, and is therefor easier to evaluate.
* Because of the low-detail graphic, the Data has been transfered in regions.
* The regions, where there is no data available have been made transparent to indicate, that there is no data availible, but that the region is still there to compare. If these parties have been removed, the user would lose the overview over all regions.
* The bars are vertically arranged in order to allow easier comparison of data.

The overall change of the presentation style is a better solution for the comparison of this kind of data.

== Links ==

* [[Teaching:TUW_-_UE_InfoVis_WS_2008/09|InfoVis:Wiki UE Homepage]]

* [http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/ UE InfoVis]

* [[Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05|Gruppe 05]]

==References==

*[Tufte et al., 1999] E. Tufte Design Principle Project: The Visual Display of Quantitative Information, Retrieved at: December 08, 2008. http://ldt.stanford.edu/ldt1999/Students/mizuno/Portfolio/Work/reports/tufte/ed229c-tufte-outline.html
*[Few, 2004a] Show Me the Numbers: Designing Tables and Graphs to Enlighten, Analytics Press, 2004, Chapter 7 - General Design for Communication.
*[Few, 2004b] Elegance Through Simplicity Article about redesigning graphs . Retrieved at: December 08, 2008. http://www.intelligententerprise.com/showArticle.jhtml;jsessionid=N2ATDQWY5VYKSQSNDBGCKHSCJUMEKJVN?articleID=49400920

File:W2lg stripes 15.gif

2008-11-26T22:35:26Z

Farukp:

== Summary ==
Demonstration of machbands: White to a lighter grey color in 15 steps with borders

== Copyright status ==
[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

== Source ==
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

File:W2lg 15steps.gif

2008-11-26T22:35:04Z

Farukp:

== Summary ==
Demonstration of machbands: White to a lighter grey color in 15 steps

== Copyright status ==
[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

== Source ==
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

File:W2grey 15.gif

2008-11-26T22:34:24Z

Farukp:

== Summary ==
Demonstration of machbands: White to grey in 15 steps

== Copyright status ==
[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

== Source ==
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

File:W2b 10steps.gif

2008-11-26T22:33:33Z

Farukp:

== Summary ==
Demonstration of machbands: White to Black Color in 10 Steps

== Copyright status ==
[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

== Source ==
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

File:W2lg stripes 15.gif

2008-11-26T22:32:48Z

Farukp:

== Summary ==
Demonstration of machbands

== Copyright status ==
[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

== Source ==
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 1 - Mach band

2008-11-26T22:29:21Z

Farukp:

== Mach Band ==

----

===DEFINITION===

{{Quotation| Mach bands are an optical illusion consisting of an image of two wide bands, one light and one dark, separated by a narrow strip with a light-to-dark gradient. The human eye perceives two narrow bands of different brightnesses either side of the gradient that are not present in the original image. The illusion is named after Ernst Mach. |[Wikipedia]}}

----

===OCCURENCE===

The machband effect can be perceived by looking at two neighboring surfaces with different luminance that are either black and white or colored. The bigger the contrast in light intensities the more apperend Mach bands will be.

===CAUSATION===

The mach band effect is supposed to be caused by lateral inhibition. Imagine three neighbouring
retina receptor cells - each one of them is stimulated at a different light-intensity level. The level of the
stimulation is transformed into action potentials and later on forwarded to its
neighbours. Inhibitory interneurons weaken these signals and transfer them to so
called secondary neurons. The attenuation is proportional to the excitation of the
interneurons. By the summation of exciting and alleviative factors to the second
neuron a contrast enhancement is archieved.

As shown in the image below, we have to examine the edge which is represented schematically between an
homogenous bright area (between receptor 1 and 5) and an homogenous dark area
(between receptor 6 and 10). Without interaction every receptor of 1 to 5 would
represent the same high and every receptor from 6-10 the same low signal. But
because of the connection by an horizontal receptor cell the signal of for example receptor 3 is
attenuated because his neighbours impact on it inhibitorily. Only 5 and 6 are not
affected because the have the same amount of inhibitory and excitatory neighbours.

[[Image:Machband.JPG]]

===EXAMPLES===

White to black in 10 Steps

[[Image:w2b_10steps.gif]]

White to grey (255,255,255 -> 200,200,200) in 20 Steps

[[Image:w2grey_15.gif]]

White to a lighter grey(220) in 20 steps - The difference should be visible

[[Image:w2lg_15steps.gif]]

Same as above but with seperators - The usual human eye probably can not differ the different tones in the middle of this example

[[Image:w2lg_stripes_15.gif]]

The four images Shown in the "Examples" Section have been made by the Mach Banding Interactive Demonstration.

===Machband and Rendering===

Due to the linear intensity interpolation the Mach bands can cause distortion when rendering with Gouraud Shading. In this particular area, the machband can appear on the edges of polygons and cause an unintentional visual effect. A rendering method which can work around the problems caused by the mach-bands is Phong Shading.

===LINKS===

[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

===REFERENCES===

[Schmitt, Sturm, Pries, 2006] Lutz Pries, Frank Schmitt, Patrick Sturm. Fragmente eines Skripts zur Bildverarbeitung. 31. Oktober 2006, http://www.uni-koblenz.de/~lb/lehre/ws2006/bv/bvbuch.pdf

[Jo Baer, 2008] Jo Bear, Mach bands. Retrieved at 22.11.2008. http://www.ubu.com/aspen/aspen8/machBands.html

[Biokurs.de] Lichtsinn. http://www.biokurs.de/skripten/12/bs12-38b.htm

[Wikipedia, 2008] Wikipedia.org, Laterale Hemmung. Retrieved at 22.11.2008. http://de.wikipedia.org/wiki/Laterale_Hemmung

[Wikipedia, 2008] Wikipedia.org, Mach bands. Retrieved at 22.11.2008 http://en.wikipedia.org/wiki/Mach_bands

[Perceptual Stuff] http://perceptualstuff.org/machbandsbasic.html

[The Joy of Visual Perception] http://www.yorku.ca/eye/machband.htm

[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 1 - Mach band

2008-11-26T22:28:25Z

Farukp:

== Mach Band ==

----

===DEFINITION===

{{Quotation| Mach bands are an optical illusion consisting of an image of two wide bands, one light and one dark, separated by a narrow strip with a light-to-dark gradient. The human eye perceives two narrow bands of different brightnesses either side of the gradient that are not present in the original image. The illusion is named after Ernst Mach. |[Wikipedia]}}

----

===OCCURENCE===

The machband effect can be perceived by looking at two neighboring surfaces with different luminance that are either black and white or colored. The bigger the contrast in light intensities the more apperend Mach bands will be.

===CAUSATION===

The mach band effect is supposed to be caused by lateral inhibition. Imagine three neighbouring
retina receptor cells - each one of them is stimulated at a different light-intensity level. The level of the
stimulation is transformed into action potentials and later on forwarded to its
neighbours. Inhibitory interneurons weaken these signals and transfer them to so
called secondary neurons. The attenuation is proportional to the excitation of the
interneurons. By the summation of exciting and alleviative factors to the second
neuron a contrast enhancement is archieved.

As shown in the image below, we have to examine the edge which is represented schematically between an
homogenous bright area (between receptor 1 and 5) and an homogenous dark area
(between receptor 6 and 10). Without interaction every receptor of 1 to 5 would
represent the same high and every receptor from 6-10 the same low signal. But
because of the connection by an horizontal receptor cell the signal of for example receptor 3 is
attenuated because his neighbours impact on it inhibitorily. Only 5 and 6 are not
affected because the have the same amount of inhibitory and excitatory neighbours.

[[Image:Machband.JPG]]

===EXAMPLES===

White to black in 10 Steps

[[Image:w2b_10steps.gif]]

White to grey (255,255,255 -> 200,200,200) in 20 Steps

[[Image:w2grey_15.gif]]

White to a lighter grey(220) in 20 steps - The difference should be visible

[[Image:w2lg_15steps.gif]]

Same as above but with seperators - The usual human eye probably can not differ the different tones in the middle of this example

[[Image:w2lg_stripes_15.gif]]

The images Shown in this description have been made by the Mach Banding Interactive Demonstration.

===Machband and Rendering===

Due to the linear intensity interpolation the Mach bands can cause distortion when rendering with Gouraud Shading. In this particular area, the machband can appear on the edges of polygons and cause an unintentional visual effect. A rendering method which can work around the problems caused by the mach-bands is Phong Shading.

===LINKS===

[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

===REFERENCES===

[Schmitt, Sturm, Pries, 2006] Lutz Pries, Frank Schmitt, Patrick Sturm. Fragmente eines Skripts zur Bildverarbeitung. 31. Oktober 2006, http://www.uni-koblenz.de/~lb/lehre/ws2006/bv/bvbuch.pdf

[Jo Baer, 2008] Jo Bear, Mach bands. Retrieved at 22.11.2008. http://www.ubu.com/aspen/aspen8/machBands.html

[Biokurs.de] Lichtsinn. http://www.biokurs.de/skripten/12/bs12-38b.htm

[Wikipedia, 2008] Wikipedia.org, Laterale Hemmung. Retrieved at 22.11.2008. http://de.wikipedia.org/wiki/Laterale_Hemmung

[Wikipedia, 2008] Wikipedia.org, Mach bands. Retrieved at 22.11.2008 http://en.wikipedia.org/wiki/Mach_bands

[Perceptual Stuff] http://perceptualstuff.org/machbandsbasic.html

[The Joy of Visual Perception] http://www.yorku.ca/eye/machband.htm

[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 1 - Mach band

2008-11-26T22:26:36Z

Farukp:

== Mach Band ==

----

===DEFINITION===

{{Quotation| Mach bands are an optical illusion consisting of an image of two wide bands, one light and one dark, separated by a narrow strip with a light-to-dark gradient. The human eye perceives two narrow bands of different brightnesses either side of the gradient that are not present in the original image. The illusion is named after Ernst Mach. |[Wikipedia]}}

----

===OCCURENCE===

The machband effect can be perceived by looking at two neighboring surfaces with different luminance that are either black and white or colored. The bigger the contrast in light intensities the more apperend Mach bands will be.

===CAUSATION===

The mach band effect is supposed to be caused by lateral inhibition. Imagine three neighbouring
retina receptor cells - each one of them is stimulated at a different light-intensity level. The level of the
stimulation is transformed into action potentials and later on forwarded to its
neighbours. Inhibitory interneurons weaken these signals and transfer them to so
called secondary neurons. The attenuation is proportional to the excitation of the
interneurons. By the summation of exciting and alleviative factors to the second
neuron a contrast enhancement is archieved.

As shown in the image below, we have to examine the edge which is represented schematically between an
homogenous bright area (between receptor 1 and 5) and an homogenous dark area
(between receptor 6 and 10). Without interaction every receptor of 1 to 5 would
represent the same high and every receptor from 6-10 the same low signal. But
because of the connection by an horizontal receptor cell the signal of for example receptor 3 is
attenuated because his neighbours impact on it inhibitorily. Only 5 and 6 are not
affected because the have the same amount of inhibitory and excitatory neighbours.

[[Image:Machband.JPG]]

===EXAMPLES===

White to black in 10 Steps

[[Image:w2b_10steps.gif]]

White to grey (255,255,255 -> 200,200,200) in 20 Steps

[[Image:w2grey_15.gif]]

White to a lighter grey(220) in 20 steps - The difference should be visible

[[Image:w2lg_15steps.gif]]

Same as above but with seperators - The usual human eye probably can not differ the different tones in the middle of this example

[[Image:w2lg_stripes_15.gif]]

===Machband and Rendering===

Due to the linear intensity interpolation the Mach bands can cause distortion when rendering with Gouraud Shading. In this particular area, the machband can appear on the edges of polygons and cause an unintentional visual effect. A rendering method which can work around the problems caused by the mach-bands is Phong Shading.

===LINKS===

[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

===REFERENCES===

[Schmitt, Sturm, Pries, 2006] Lutz Pries, Frank Schmitt, Patrick Sturm. Fragmente eines Skripts zur Bildverarbeitung. 31. Oktober 2006, http://www.uni-koblenz.de/~lb/lehre/ws2006/bv/bvbuch.pdf

[Jo Baer, 2008] Jo Bear, Mach bands. Retrieved at 22.11.2008. http://www.ubu.com/aspen/aspen8/machBands.html

[Biokurs.de] Lichtsinn. http://www.biokurs.de/skripten/12/bs12-38b.htm

[Wikipedia, 2008] Wikipedia.org, Laterale Hemmung. Retrieved at 22.11.2008. http://de.wikipedia.org/wiki/Laterale_Hemmung

[Wikipedia, 2008] Wikipedia.org, Mach bands. Retrieved at 22.11.2008 http://en.wikipedia.org/wiki/Mach_bands

[Perceptual Stuff] http://perceptualstuff.org/machbandsbasic.html

[The Joy of Visual Perception] http://www.yorku.ca/eye/machband.htm

[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 2

2008-11-21T18:29:01Z

Farukp:

== Aufgabenstellung ==
[http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/infovis_ue_aufgabe2.html Beschreibung der Aufgabe 2]

=== Zu beurteilende Tabelle ===

[[Image:AnimalsKilledforFood.jpg|600px]]

== Critical comments ==

* Too many colors where white space would be sufficient
* The comparison column ''07/06'' is placed between the two columns it refers to (''2006'' and ''2007''), but this is not true for the comparison column ''06/05''
* In the columns ''06/05'' and ''07/06'' the numbers / decimal points are not aligned
* A comma is placed to the left of every three digits in the ''Total'' row, but not in the table body
* In the ''%died'' column, a % sign is missing after each number
* In the column headers, years are sometimes formatted using four digits (e.g. ''2005''), and sometimes using two digits (e.g. ''06/05'')
* Columns ''06/05'' and ''07/06'' use a higher precision / more digits after the comma
* Different fonts are used in the table body and the column / row headers
* Some column headers are set to bold font and some are not
* All numbers in the ''2007'' column are bold just like the numbers in the ''Total'' row, although the ''2007'' numbers do not summarize anything
* Columns are separated from each other using colors, which makes it difficult to scan through the rows and compare numbers from one row to each other
* The spanner header ''2005'' is not aligned to the center, while all other spanner headers are center-aligned
* The outer grid is not necessary
* More categories are available in the ''2006'' section than in the ''2005'' and ''2007'' section

== Adapted table ==

[[Image:ue2_adaptedtable_0426716.gif]]

== Adaptions ==
* The color-seperation was replaced by a whitespace(grey background on every second row). By using the whitespaces the colors don't distract and the information is easily readable
* The comparison columns were placed at the end of the table. The placement between the years leads to confusion
* The numbers / decimal points are aligned in all columns
* The usage of a comma/point is being applied to all numbers the same
* The %-Symbol has been added everywhere it is supposed to be
* The formatting in the headers and the table now has a standard.
* The usage of decimal places has been standardized
* One font has been chosen for the whole table diversifying in weight and size
* All column headers are now bold
* Only the numbers in the total column are now bold. This way there is no confusion about the usage of this formating
* The seperation through a whitespace is a great way to seperate columns.
* The spanner-headers are all aligned the same way
* The outer grid has been removed
* Due to the fact, that there is not enough information in the years 2005 and 2007, the main order in the table is now the "killed" column. From this column there is the information from all given years

== Links ==

* [[Teaching:TUW_-_UE_InfoVis_WS_2008/09|InfoVis:Wiki UE Homepage]]

* [http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/ UE InfoVis]

*[[Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05|Gruppe 05]]

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 2

2008-11-20T13:46:52Z

Farukp:

== Aufgabenstellung ==
[http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/infovis_ue_aufgabe2.html Beschreibung der Aufgabe 2]

=== Zu beurteilende Tabelle ===

[[Image:AnimalsKilledforFood.jpg|600px]]

== Critical comments ==

* Too many colors where white space would be sufficient
* The comparison column ''07/06'' is placed between the two columns it refers to (''2006'' and ''2007''), but this is not true for the comparison column ''06/05''
* In the columns ''06/05'' and ''07/06'' the numbers / decimal points are not aligned
* A comma is placed to the left of every three digits in the ''Total'' row, but not in the table body
* In the ''%died'' column, a % sign is missing after each number
* In the column headers, years are sometimes formatted using four digits (e.g. ''2005''), and sometimes using two digits (e.g. ''06/05'')
* Columns ''06/05'' and ''07/06'' use a higher precision / more digits after the comma
* Different fonts are used in the table body and the column / row headers
* Some column headers are set to bold font and some are not
* All numbers in the ''2007'' column are bold just like the numbers in the ''Total'' row, although the ''2007'' numbers do not summarize anything
* Columns are separated from each other using colors, which makes it difficult to scan through the rows and compare numbers from one row to each other
* The spanner header ''2005'' is not aligned to the center, while all other spanner headers are center-aligned
* The outer grid is not necessary
* More categories are available in the ''2006'' section than in the ''2005'' and ''2007'' section

== Adapted table ==

[[Image:ue2_adaptedtable_0426716.gif]]

== Adaptions ==
* The color-seperation was replaced by a whitespace(grey background on every second row). By using the whitespaces the colors don't distract and the information is easily readable
* The comparison columns were placed at the end of the table. The placement between the years leads to confusion
* The numbers / decimal points are aligned in all columns
* The outer grid has been removed
* Due to the fact, that there is not enough information in the years 2005 and 2007, the main order in the table is now the "killed" column. From this column there is the information from all given years

== Links ==

* [[Teaching:TUW_-_UE_InfoVis_WS_2008/09|InfoVis:Wiki UE Homepage]]

* [http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/ UE InfoVis]

*[[Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05|Gruppe 05]]

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 2

2008-11-20T13:46:10Z

Farukp:

== Aufgabenstellung ==
[http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/infovis_ue_aufgabe2.html Beschreibung der Aufgabe 2]

=== Zu beurteilende Tabelle ===

[[Image:AnimalsKilledforFood.jpg|600px]]

== Critical comments ==

* Too many colors where white space would be sufficient
* The comparison column ''07/06'' is placed between the two columns it refers to (''2006'' and ''2007''), but this is not true for the comparison column ''06/05''
* In the columns ''06/05'' and ''07/06'' the numbers / decimal points are not aligned
* A comma is placed to the left of every three digits in the ''Total'' row, but not in the table body
* In the ''%died'' column, a % sign is missing after each number
* In the column headers, years are sometimes formatted using four digits (e.g. ''2005''), and sometimes using two digits (e.g. ''06/05'')
* Columns ''06/05'' and ''07/06'' use a higher precision / more digits after the comma
* Different fonts are used in the table body and the column / row headers
* Some column headers are set to bold font and some are not
* All numbers in the ''2007'' column are bold just like the numbers in the ''Total'' row, although the ''2007'' numbers do not summarize anything
* Columns are separated from each other using colors, which makes it difficult to scan through the rows and compare numbers from one row to each other
* The spanner header ''2005'' is not aligned to the center, while all other spanner headers are center-aligned
* The outer grid is not necessary
* More categories are available in the ''2006'' section than in the ''2005'' and ''2007'' section

== Adapted table ==

[[Image:ue2_adaptedtable_0426716.gif]]

== Adaptions ==
* The color-seperation was replaced by a whitespace(grey background on every second row). By using the whitespaces the colors don't distract and the information is easily readable
* The comparison columns were placed at the end of the table. The placement between the years leads to confusion
* The numbers / decimal points are aligned in all columns
* The outer grid has been removed
* Due to the fact, that there is not enough information in the years 2005 and 2007, the main order in the table is now the "killed" column. From this column there is the information from all given years. The other columns were ordered by the given years

== Links ==

* [[Teaching:TUW_-_UE_InfoVis_WS_2008/09|InfoVis:Wiki UE Homepage]]

* [http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/ UE InfoVis]

*[[Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05|Gruppe 05]]

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 2

2008-11-20T13:43:32Z

Farukp:

== Aufgabenstellung ==
[http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/infovis_ue_aufgabe2.html Beschreibung der Aufgabe 2]

=== Zu beurteilende Tabelle ===

[[Image:AnimalsKilledforFood.jpg|600px]]

== Critical comments ==

* Too many colors where white space would be sufficient
* The comparison column ''07/06'' is placed between the two columns it refers to (''2006'' and ''2007''), but this is not true for the comparison column ''06/05''
* In the columns ''06/05'' and ''07/06'' the numbers / decimal points are not aligned
* A comma is placed to the left of every three digits in the ''Total'' row, but not in the table body
* In the ''%died'' column, a % sign is missing after each number
* In the column headers, years are sometimes formatted using four digits (e.g. ''2005''), and sometimes using two digits (e.g. ''06/05'')
* Columns ''06/05'' and ''07/06'' use a higher precision / more digits after the comma
* Different fonts are used in the table body and the column / row headers
* Some column headers are set to bold font and some are not
* All numbers in the ''2007'' column are bold just like the numbers in the ''Total'' row, although the ''2007'' numbers do not summarize anything
* Columns are separated from each other using colors, which makes it difficult to scan through the rows and compare numbers from one row to each other
* The spanner header ''2005'' is not aligned to the center, while all other spanner headers are center-aligned
* The outer grid is not necessary
* More categories are available in the ''2006'' section than in the ''2005'' and ''2007'' section

== Adapted table ==

[[Image:ue2_adaptedtable_0426716.gif]]

== Adaptions ==
* The color-seperation was replaced by a whitespace(grey background on every second row). By using the whitespaces the colors don't distract and the information is easily readable
* The comparison columns were placed at the end of the table. The placement between the years leads to confusion
* The numbers / decimal points are aligned in all columns

== Links ==

* [[Teaching:TUW_-_UE_InfoVis_WS_2008/09|InfoVis:Wiki UE Homepage]]

* [http://ieg.ifs.tuwien.ac.at/~gschwand/teaching/infovis_ue_ws08/ UE InfoVis]

*[[Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05|Gruppe 05]]

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 1 - Mach band

2008-11-12T22:29:55Z

Farukp:

== Mach Band ==

----

===DEFINITION===

{{Quotation| Mach bands are an optical illusion consisting of an image of two wide bands, one
light and one dark, separated by a narrow strip with a light-to-dark gradient. The
human eye perceives two narrow bands of different brightnesses either side of the
gradient that are not present in the original image. The illusion is named after Ernst
Mach. |[Wikipedia]}}

----

===EXAMPLES===

Try to differ as many colors as possible

White to black in 10 Steps

[[Image:w2b_10steps.gif]]

White to grey (255,255,255 -> 200,200,200) in 20 Steps

[[Image:w2grey_15.gif]]

White to a lighter grey(220) in 20 steps (you can see the difference? – probably)

[[Image:w2lg_15steps.gif]]

Same as above but with seperators (Can you see a difference in the middle
part?)

[[Image:w2lg_stripes_15.gif]]

Try it out with different colors
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

This effect is supposed to be caused by lateral inhibition. Imagine three neighbouring
retina cells - each one of them is stimulated at a different label. The level of the
stimulation is transformed into action potentials and later on forwarded to its
neighbours. Inhibitory interneurons weaken these signals and transfer them to so
called secondary neurons. The attenuation is proportional to the excitation of the
interneurons. By the summation of exciting and alleviative factors to the second
neuron a contrast enhancement is archieved.
We have to examine the edge which is represented schematically between an
homogenous bright area (between receptor 1 and 5) and an homogenous dark area
(between receptor 6 and 10). Without interaction every receptor of 1 to 5 would
represent the same high and every receptor from 6-10 the same low signal. But
because of the connection by an horizontal cell the signal of for example receptor 3 is
attenuated because his neighbours impact on it inhibitorily. Only 5 and 6 are not
affected because the have the same amount of inhibitory and excitatory neighbours.

===Machband and Rendering===

Due to the linear intensity interpolation the Mach bands can cause trouble when for example
using Gouraud Shading for rendering. Here the Machband effect can be visible at the
edges of polygons. A rendering method which can work around the mach-band is
Phong Shading.

===REFERENCES===

[Schmitt, Sturm, Pries, 2006] Lutz Pries, Frank Schmitt, Patrick Sturm. Fragmente eines Skripts
zur Bildverarbeitung. 31. Oktober 2006, http://www.uni-koblenz.de/~lb/lehre/ws2006/bv/bvbuch.pdf

[Biokurs.de] Lichtsinn. http://www.biokurs.de/skripten/12/bs12-38b.htm

[Wikipedia] http://de.wikipedia.org/wiki/Laterale_Hemmung

[Perceptual Stuff] http://perceptualstuff.org/machbandsbasic.html

[The Joy of Visual Perception] http://www.yorku.ca/eye/machband.htm

[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 1 - Mach band

2008-11-12T22:29:26Z

Farukp:

== Mach Band ==

----

===DEFINITION===

{{Quotation| Mach bands are an optical illusion consisting of an image of two wide bands, one
light and one dark, separated by a narrow strip with a light-to-dark gradient. The
human eye perceives two narrow bands of different brightnesses either side of the
gradient that are not present in the original image. The illusion is named after Ernst
Mach. |[Wikipedia]}}

----

===EXAMPLES===

Try to differ as many colors as possible

White to black in 10 Steps

[[Image:w2b_10steps.gif]]

White to grey (255,255,255 -> 200,200,200) in 20 Steps

[[Image:w2grey_15.gif]]

White to a lighter grey(220) in 20 steps (you can see the difference? – probably)

[[Image:w2lg_15steps.gif]]

Same as above but with seperators (Can you see a difference in the middle
part?)

[[Image:w2lg_stripes_15.gif]]

Try it out with different colors
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

This effect is supposed to be caused by lateral inhibition. Imagine three neighbouring
retina cells - each one of them is stimulated at a different label. The level of the
stimulation is transformed into action potentials and later on forwarded to its
neighbours. Inhibitory interneurons weaken these signals and transfer them to so
called secondary neurons. The attenuation is proportional to the excitation of the
interneurons. By the summation of exciting and alleviative factors to the second
neuron a contrast enhancement is archieved.
We have to examine the edge which is represented schematically between an
homogenous bright area (between receptor 1 and 5) and an homogenous dark area
(between receptor 6 and 10). Without interaction every receptor of 1 to 5 would
represent the same high and every receptor from 6-10 the same low signal. But
because of the connection by an horizontal cell the signal of for example receptor 3 is
attenuated because his neighbours impact on it inhibitorily. Only 5 and 6 are not
affected because the have the same amount of inhibitory and excitatory neighbours.

===Machband and Rendering===

Due to the linear intensity interpolation the Mach bands can cause trouble when for example
using Gouraud Shading for rendering. Here the Machband effect can be visible at the
edges of polygons. A rendering method which can work around the mach-band is
Phong Shading.

===REFERENCES===

[Schmitt, Sturm, Pries, 2006] Lutz Pries, Frank Schmitt, Patrick Sturm. Fragmente eines Skripts
zur Bildverarbeitung. 31. Oktober 2006

http://www.uni-koblenz.de/~lb/lehre/ws2006/bv/bvbuch.pdf

[Biokurs.de] Lichtsinn. http://www.biokurs.de/skripten/12/bs12-38b.htm

[Wikipedia] http://de.wikipedia.org/wiki/Laterale_Hemmung

[Perceptual Stuff] http://perceptualstuff.org/machbandsbasic.html

[The Joy of Visual Perception] http://www.yorku.ca/eye/machband.htm

[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 1 - Mach band

2008-11-07T10:13:06Z

Farukp:

== Mach Band ==

----

===DEFINITION===

{{Quotation| Mach bands are an optical illusion consisting of an image of two wide bands, one
light and one dark, separated by a narrow strip with a light-to-dark gradient. The
human eye perceives two narrow bands of different brightnesses either side of the
gradient that are not present in the original image. The illusion is named after Ernst
Mach. |[Wikipedia]}}

----

===EXAMPLES===

Try to differ as many colors as possible

White to black in 10 Steps

[[Image:w2b_10steps.gif]]

White to grey (255,255,255 -> 200,200,200) in 20 Steps

[[Image:w2grey_15.gif]]

White to a lighter grey(220) in 20 steps (you can see the difference? – probably)

[[Image:w2lg_15steps.gif]]

Same as above but with seperators (Can you see a difference in the middle
part?)

[[Image:w2lg_stripes_15.gif]]

Try it out with different colors
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

This effect is supposed to be caused by lateral inhibition. Imagine three neighbouring
retina cells - each one of them is stimulated at a different label. The level of the
stimulation is transformed into action potentials and later on forwarded to its
neighbours. Inhibitory interneurons weaken these signals and transfer them to so
called secondary neurons. The attenuation is proportional to the excitation of the
interneurons. By the summation of exciting and alleviative factors to the second
neuron a contrast enhancement is archieved.
We have to examine the edge which is represented schematically between an
homogenous bright area (between receptor 1 and 5) and an homogenous dark area
(between receptor 6 and 10). Without interaction every receptor of 1 to 5 would
represent the same high and every receptor from 6-10 the same low signal. But
because of the connection by an horizontal cell the signal of for example receptor 3 is
attenuated because his neighbours impact on it inhibitorily. Only 5 and 6 are not
affected because the have the same amount of inhibitory and excitatory neighbours.

===Machband and Rendering===

Due to the linear intensity interpolation the Mach bands can cause trouble when
using Gouroud Shading for rendering. Here the Machband effect can be visible at the
edges of polygons. A rendering method which can work around the mach-band is
Phong Shading.

===REFERENCES===

[Schmitt, Sturm, Pries, 2006] Lutz Pries, Frank Schmitt, Patrick Sturm. Fragmente eines Skripts
zur Bildverarbeitung. 31. Oktober 2006

http://www.uni-koblenz.de/~lb/lehre/ws2006/bv/bvbuch.pdf

[Biokurs.de] Lichtsinn. http://www.biokurs.de/skripten/12/bs12-38b.htm

[Wikipedia]

[Perceptual Stuff] http://perceptualstuff.org/machbandsbasic.html

[The Joy of Visual Perception] http://www.yorku.ca/eye/machband.htm

[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 1 - Mach band

2008-11-07T10:11:18Z

Farukp:

== Mach Band ==

----

===DEFINITION===

{{Quotation| Mach bands are an optical illusion consisting of an image of two wide bands, one
light and one dark, separated by a narrow strip with a light-to-dark gradient. The
human eye perceives two narrow bands of different brightnesses either side of the
gradient that are not present in the original image. The illusion is named after Ernst
Mach. |[Wikipedia]}}

----

===EXAMPLES===

Try to differ as many colors as possible

White to black in 10 Steps

[[Image:w2b_10steps.gif]]

White to grey (255,255,255 -> 200,200,200) in 20 Steps

[[Image:w2grey_15.gif]]

White to a lighter grey(220) in 20 steps (you can see the difference? – probably)

[[Image:w2lg_15steps.gif]]

Same as above but with seperators (Can you see a difference in the middle
part?)

[[Image:w2lg_stripes_15.gif]]

Try it out with different colors
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

This effect is supposed to be caused by lateral inhibition. Imagine three neighbouring
retina cells - each one of them is stimulated at a different label. The level of the
stimulation is transformed into action potentials and later on forwarded to its
neighbours. Inhibitory interneurons weaken these signals and transfer them to so
called secondary neurons. The attenuation is proportional to the excitation of the
interneurons. By the summation of exciting and alleviative factors to the second
neuron a contrast enhancement is archieved.
We have to examine the edge which is represented schematically between an
homogenous bright area (between receptor 1 and 5) and an homogenous dark area
(between receptor 6 and 10). Without interaction every receptor of 1 to 5 would
represent the same high and every receptor from 6-10 the same low signal. But
because of the connection by an horizontal cell the signal of for example receptor 3 is
attenuated because his neighbours impact on it inhibitorily. Only 5 and 6 are not
affected because the have the same amount of inhibitory and excitatory neighbours.

===Machband and Rendering===

Due to the linear intensity interpolation the Mach bands can cause trouble when
using Gouroud Shading for rendering. Here the Machband effect can be visible at the
edges of polygons. A rendering method which can work around the mach-band is
Phong Shading.

===REFERENCES===

[Schmitt, Sturm, Pries, 2006] Lutz Pries, Frank Schmitt, Patrick Sturm. Fragmente eines Skripts
zur Bildverarbeitung. 31. Oktober 2006

http://www.uni-koblenz.de/~lb/lehre/ws2006/bv/bvbuch.pdf

[Biokurs.de] Lichtsinn. http://www.biokurs.de/skripten/12/bs12-38b.htm

[Perceptual Stuff] http://perceptualstuff.org/machbandsbasic.html

[The Joy of Visual Perception] http://www.yorku.ca/eye/machband.htm

[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 1 - Mach band

2008-11-07T10:10:55Z

Farukp:

== Mach Band ==

----

===DEFINITION===

{{Quotation| Mach bands are an optical illusion consisting of an image of two wide bands, one
light and one dark, separated by a narrow strip with a light-to-dark gradient. The
human eye perceives two narrow bands of different brightnesses either side of the
gradient that are not present in the original image. The illusion is named after Ernst
Mach. |[Wikipedia]}}

----

===EXAMPLES===

Try to differ as many colors as possible

White to black in 10 Steps

[[Image:w2b_10steps.gif]]

White to grey (255,255,255 -> 200,200,200) in 20 Steps

[[Image:w2grey_15.gif]]

White to a lighter grey(220) in 20 steps (you can see the difference? – probably)

[[Image:w2lg_15steps.gif]]

Same as above but with seperators (Can you see a difference in the middle
part?)

[[Image:w2lg_stripes_15.gif]]

Try it out with different colors
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

This effect is supposed to be caused by lateral inhibition. Imagine three neighbouring
retina cells - each one of them is stimulated at a different label. The level of the
stimulation is transformed into action potentials and later on forwarded to its
neighbours. Inhibitory interneurons weaken these signals and transfer them to so
called secondary neurons. The attenuation is proportional to the excitation of the
interneurons. By the summation of exciting and alleviative factors to the second
neuron a contrast enhancement is archieved.
We have to examine the edge which is represented schematically between an
homogenous bright area (between receptor 1 and 5) and an homogenous dark area
(between receptor 6 and 10). Without interaction every receptor of 1 to 5 would
represent the same high and every receptor from 6-10 the same low signal. But
because of the connection by an horizontal cell the signal of for example receptor 3 is
attenuated because his neighbours impact on it inhibitorily. Only 5 and 6 are not
affected because the have the same amount of inhibitory and excitatory neighbours.

===Machband and Rendering===

Due to the linear intensity interpolation the Mach bands can cause trouble when
using Gouroud Shading for rendering. Here the Machband effect can be visible at the
edges of polygons. A rendering method which can work around the mach-band is
Phong Shading.

===REFERENCES===

[Schmitt, Sturm, Pries, 2006] Lutz Pries, Frank Schmitt, Patrick Sturm. Fragmente eines Skripts
zur Bildverarbeitung. 31. Oktober 2006
http://www.uni-koblenz.de/~lb/lehre/ws2006/bv/bvbuch.pdf

[Biokurs.de] Lichtsinn. http://www.biokurs.de/skripten/12/bs12-38b.htm

[Perceptual Stuff] http://perceptualstuff.org/machbandsbasic.html

[The Joy of Visual Perception] http://www.yorku.ca/eye/machband.htm

[Mach Banding Interactive Demonstration] http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 1 - Mach band

2008-11-07T10:07:01Z

Farukp:

File:W2lg stripes 15.gif

2008-11-07T10:03:43Z

Farukp: New page: == Summary == == Copyright status == == Source == http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

== Summary ==

== Copyright status ==

== Source ==
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

File:W2lg 15steps.gif

2008-11-07T10:03:28Z

Farukp: New page: == Summary == == Copyright status == == Source == http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

== Summary ==

== Copyright status ==

== Source ==
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 1 - Mach band

2008-11-07T10:03:04Z

Farukp:

File:W2grey 15.gif

2008-11-07T09:57:13Z

Farukp: New page: == Summary == == Copyright status == == Source == http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

== Summary ==

== Copyright status ==

== Source ==
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 1 - Mach band

2008-11-07T09:56:51Z

Farukp:

File:W2b 10steps.gif

2008-11-07T09:55:13Z

Farukp: White to Black Color in 10 Steps

== Summary ==
White to Black Color in 10 Steps
== Copyright status ==

== Source ==
http://www.nbb.cornell.edu/neurobio/land/OldStudentProjects/cs490-96to97/anson/MachBandingApplet/

Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 05 - Aufgabe 1 - Mach band

2008-11-07T09:49:11Z

Farukp:

User:UE-InfoVis0809 0125255

2008-10-22T10:45:31Z

Farukp:

[[Image:guten_morgen.jpg]] 
 
Name: Faruk Pinjo 
Matrikelnummer: 0125255 
Studienkennzahl: 033 532 
E-Mail Adresse: e0125255 (at) student.tuwien.ac.at

File:Guten morgen.jpg

2008-10-22T10:44:44Z

Farukp: Guten Morgen FARUK!

== Summary ==
Guten Morgen FARUK!
== Copyright status ==
Faruk Pinjo
== Source ==

User:UE-InfoVis0809 0125255

2008-10-22T10:43:08Z

Farukp: New page: Image:.jpg Name: Faruk Pinjo Matrikelnummer: 0125255 Studienkennzahl: 033 532 E-Mail Adresse: e0125255 (at) student.tuwi...

[[Image:.jpg]] 
 
Name: Faruk Pinjo 
Matrikelnummer: 0125255 
Studienkennzahl: 033 532 
E-Mail Adresse: e0125255 (at) student.tuwien.ac.at