Cluster Size: Difference between revisions
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[[File:ClusterSize_Segment.png|250px|caption]]<br> | [[File:ClusterSize_Segment.png|250px|caption]]<br> | ||
There are two options, you can put the targets spread out over the entire segment | There are two options, you can either: | ||
* put the targets spread out over the entire segment | |||
* place the targets close together | |||
===Spread Out Tracking Targets=== | ===Spread Out Tracking Targets=== |
Latest revision as of 17:30, 14 February 2023
Language: | English • français • italiano • português • español |
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To track a segment, a minimum of three noncolinear targets are required.
As long as the three targets are not in a straight line, the segment can be tracked. However, the distance between the targets will affect your tracking.
For example, assume you have a segment as shown below:
There are two options, you can either:
- put the targets spread out over the entire segment
- place the targets close together
Spread Out Tracking Targets
If the targets are spread out over the segment:
It takes a large amount of target movement to produce a large change in the position and orientation of the segment:
Close Together Tracking Targets
If the targets are spread close together:
It takes a small amount of target movement to produce a large change in the position and orientation of the segment:
Application
The closer the targets are together, the more susceptible the tracking will be to noise. So try to use best judgement when placing markers/defining clusters.
This is true for tracking any segment, but it tends to be most relevant when tracking the pelvis (using a small cluster on the lower back vs using the ASIS and PSIS) or tracking the foot (using a heel cluster vs heel and met targets).