Troubleshooting marker detection
Comprehensive guide to troubleshooting common marker detection issues in Velogic Studio
Velogic Studio should be giving you a solid wireframe/skeleton:
and the Quality Indicators should be showing "Good" for detection:
If you're not getting that, this page will help you troubleshoot.
Look for red dots - any extra? Any missing?
If Velogic Studio can't find a valid skeleton from 7 (or 8) dots, it will instead show you red dots for the markers it did find.
You can watch as the rider pedals and see if one of the markers is occasionally not being shown as a red dot. If you notice that, adjust the problematic marker so that the camera can see it better.
If you see additional red dots in the scene (like reflections on the front wheel rim), you may need to obscure it e.g. by covering with masking tape. Note that Velogic Studio can cope with some additional reflections, particularly if they're nowhere near a valid marker position; but if there are many additional reflections, or they are near a valid marker position, you will need to cover it up.
Check marker placement
Refer to our marker placement documentation. The markers need to be placed where the camera can see them directly. Common issues are:
Shoulder marker placed too high
Wrist marker rotated too far away from camera
Heel marker (if used) too far down on the shoe
Check correct number of dots selected (7 or 8)
There's a configuration setting on Step 1 which tells Velogic Studio whether you're using 7 markers, or 8 (including a heel marker). Make sure that the setting matches the actual number of markers you're using.
Look for other reflections highlighted as red dots
Logos or tabs on shorts, jersey and shoes
Shiny parts on the bike
Alloy rims
We have a lot of filtering in the detection process to eliminate the extra reflections and the high grade markers (the material printed on the VF-Tape is night-vision rated) are part of how we distinguish between wanted and unwanted reflections.
Unusually large/small/unusually-proportioned rider?
To help Velogic Studio filter out unwanted reflections, it has some internal rules to make sure that the skeleton formed by the markers could reasonably form a human body. Some of the rules are around proportionality, and some involve sizes of body segments.
Sometimes you may encounter a situation where a rider breaks one of our proportionality rules (more likely with very short or very tall riders). If you are seeing 7 (or 8) red dots, all in the correct place, but Velogic Studio is not producing a wireframe/skeleton, this may be the case for you.
To help us refine the rules, please submit a sample file which we will then investigate and use to tune the rules. See "Submitting a file for us to access" below.
Camera too far away?
If the camera is positioned more than around 8' from the plane of the bike, the dots may be too small for the camera to recognize.
See also: Setting up the fit area
Submitting a sample file for us to assess
If you are having issues with Marker Detection we have a simple process for submitting files for analysis (see the "Sharing replay files" section on that page).
Here's a video of the "Submit Sample" process:
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