1,716
edits
Changes
Jump to navigation
Jump to search
mLine 5:
Line 5: − + + + + + + + + + + Line 13:
Line 22: − + Line 55:
Line 64: − + Line 61:
Line 70: − + − + + + − All optical markers have the disadvantage of being easily obscured (something blocking the view from the cameras to the marker), so marker placement has to be considered carefully.+ + + + + − + − UNDER CONSTRUCTION+ − + + + − +
no edit summary
| caption = Screenshot of Qualisys QTM version 2024.2
| caption = Screenshot of Qualisys QTM version 2024.2
| website = [https://www.qualisys.com www.qualisys.com]
| website = [https://www.qualisys.com www.qualisys.com]
| resources =
| resources =
{{Infobox tsg
| child = yes
| downloads = {{bulleted list
| [https://github.com/qualisys/qualisys_lsl_app Qualisys LSL app]
}}
| manuals = {{bulleted list
| [https://docs.qualisys.com/qtm/ QTM Online Manual]
}}
}}
}}
}}
<!-- Table of Contents will be generated here -->
<!-- Table of Contents will be generated here -->
=Cameras=
==Cameras==
A Qualisys system is an optical motion capture system, meaning it uses cameras to record motion of your subject. This is traditionally done with markers, which emit or reflect infrared light that can be captured by the cameras. By placing multiple cameras in different locations, the system can triangulate the position of a marker.
A Qualisys system is an optical motion capture system, meaning it uses cameras to record motion of your subject. This is traditionally done with markers, which emit or reflect infrared light that can be captured by the cameras. By placing multiple cameras in different locations, the system can triangulate the position of a marker.
</references>
</references>
=Markers=
==Markers==
[[File:Passive markers.jpg|thumb|240px|A selection of passive markers]]
[[File:Passive markers.jpg|thumb|240px|A selection of passive markers]]
Choice of marker size depends on the subject and the distance between the subject and the cameras. The smaller the subject (e.g. baby's fingers), the smaller the marker needs to be. But the smaller the marker, the higher the resolution or the closer the camera should be to capture it.
Choice of marker size depends on the subject and the distance between the subject and the cameras. The smaller the subject (e.g. baby's fingers), the smaller the marker needs to be. But the smaller the marker, the higher the resolution or the closer the camera should be to capture it.
The benefit of using passive markers is that they are (relatively) cheap, and they need no cables for power or anything. The downside is that passive markers are not inherently identifiable, meaning they need to be manually labeled afterwards and cannot be streamed in real-time unless they are part of a rigid body.
The benefit of using passive markers is that they are (relatively) cheap, and they need no cables for power or anything. The downside is that passive markers are not inherently identifiable, meaning they need to be manually labeled afterwards and cannot be streamed in real-time unless they are part of a rigid body. A rigid body is an object with 3 or more markers
==Active Markers==
All optical markers (both active and passive) have the disadvantage of being easily obscured (something blocking the view from the cameras to the marker, making it impossible to track). Therefore, marker placement has to be considered carefully, and often it is wise to place additional markers for redundancy. Standard marker placement templates exist for full/partial body tracking.
===Active Markers===
Active markers are markers that emit infrared light themselves. They require an active power source (meaning they're attached to cables), but they can potentially work over longer distances, and most of all they can be individually identified.
Active markers are markers that emit infrared light themselves. They require an active power source (meaning they're attached to cables), but they can potentially work over longer distances, and most of all they can be individually identified.
The TSG is currently testing Qualisys' "Traqr" active marker systems; they will likely be available for use in the labs in the near future.
==Usage==
If you wish to capture motion with a Qualisys system, please contact the TSG. They will assist you in determining which system is best suited for your needs and, when available, will set it up for you in one of our research labs.
A training session with [[Erik van den Berge]] is required before you can use the system.
=Usage=
===LSL===
Data from QTM can be streamed in real-time via LSL using the Qualisys LSL App. Only labeled markers (3D) and rigid bodies (6DOF) can be streamed over LSL.
You can request access to manuals, tutorials and QTM from [[Erik van den Berge]]
===Data Processing===
When you have captured marker data, you can process it in QTM to label the markers and fill any gaps. Some analysis tools are available within QTM; otherwise you can export the data in a suitable format (c3d, matlab, tsv, fbx).
You can request access to QTM on your own PC from [[Erik van den Berge]].
<!--==References== Optional -->
<!--==References== Optional -->
<references /> <!-- Automatically generates list of references using the <ref></ref> tags. -->
<references /> <!-- Automatically generates list of references using the <ref></ref> tags. -->
=External Links=
==External Links==
*{{Official website|http://www.qualisys.com}}
*{{Official website|http://www.qualisys.com}}