analysistools:pointingdevice
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analysistools:pointingdevice [2017/02/28 12:47] – oliver | analysistools:pointingdevice [2017/03/17 15:04] – [Introduction] oliver | ||
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======Working with a pointing device ====== | ======Working with a pointing device ====== | ||
- | {{ : | + | =====Introduction===== |
A typical workflow, based on marker-clusters, | A typical workflow, based on marker-clusters, | ||
The pointer needs at minimum two markers, but typically four markers are used for better " | The pointer needs at minimum two markers, but typically four markers are used for better " | ||
+ | If you are a Vicon Nexus user and you are alone with the subject you want to measure it can be handy to use the smartphone and the [[https:// | ||
+ | |||
+ | {{ : | ||
+ | =====Why using a pointer instead of a marker? | ||
+ | * A marker placed on an anatomical landmark can move a lot (e.g. skin motion artefacts). Only pointing such a position in an static trial makes it clear that the defined position is valid only for this. | ||
+ | * Anatomical landmarks can be obscured by fat (e.g. the Pelvis ASIS markers for overweight subjects) | ||
+ | * Anatomical landmarks can be obscured from the cameras (e.g. some medial landmarks) or can be too close together (e.g. on the foot), which makes its tracking challenging | ||
+ | * To attach markers, the subject must expose that part of the body, which can be uncomfortable (e.g. Landmarks at the sternum for women) | ||
+ | | ||
+ | =====Modelling with tip positions===== | ||
To determine the position of the " | To determine the position of the " | ||
Zeile 54: | Zeile 64: | ||
To define an anatomical coordinate system of a bony segment, three points have to be pointed. Typically each poining is done in a separate " | To define an anatomical coordinate system of a bony segment, three points have to be pointed. Typically each poining is done in a separate " | ||
+ | =====Eclipse entries===== | ||
Using a Vicon motion capture system, the needed information to recognize the trial, can be saved as a property in the so called " | Using a Vicon motion capture system, the needed information to recognize the trial, can be saved as a property in the so called " | ||
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The value is given as an [[https:// | The value is given as an [[https:// | ||
+ | The allocation to a trial group is one part. In the case of a pointing trial the calculation depends on it. Thatś why as an additional step a " | ||
+ | <code xml> | ||
+ | < | ||
+ | | ||
+ | <switch name=" | ||
+ | <entry key=" | ||
+ | </ | ||
+ | ... | ||
+ | <switch name=" | ||
+ | <entry key=" | ||
+ | </ | ||
+ | </ | ||
+ | The switch with the name " | ||
+ | |||
+ | This switch can be used in the kinematic model: | ||
+ | |||
+ | <code xml> | ||
+ | ... | ||
+ | < | ||
+ | Position=" | ||
+ | FirstAxis=" | ||
+ | DefiningVector=" | ||
+ | orientation=" | ||
+ | <Point name=" | ||
+ | coordinateSystem=" | ||
+ | calibrateIncludes=" | ||
+ | excludes=" | ||
+ | ... | ||
+ | </ | ||
+ | The point " | ||
analysistools/pointingdevice.txt · Zuletzt geändert: 2017/03/17 15:04 von oliver