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Optimized Marker for Tracking

November 4, 2018 - 5:38am #1

Good Evening,

we're trying to optimize a makeready for a CNC-Machine via Unity for a HoloLens for a studying-project. Therefore we need to place our model as exactly as possible. We're using one image marker (barcode) for the positioning.

So i just have some "little questions" concerning the optimization of precision. I have not really found anything concerning that topic in the net. 

The questions would be the following:

  • Can we use more than one image marker (maybe 4) to center the component of the makeready in the middle of the 4 markers? 
  • Does the use of more than one image marker for one target optimize the precision?
  • Which marker type (Multi-marker / single image marker / object) gives the best values of precision?

It would be nice if anyone could help me.

Thank you very much for your effort!

Best Regards

Optimized Marker for Tracking

November 18, 2018 - 4:33am #4

Thank you very much for these information.

 

I just have one more question:

I want to try the usage of  more than one image marker (maybe 4) to center the component of the makeready in the middle of the 4 markers.

I want to take 4 equal marker for that. How can i tell the game object (in unity) that it should load itself into the middle of the 4 marker?

 

Do i need a script for that? How might this work?

I did not find anything about it. 

 

Best Regards and thanks in advance

Optimized Marker for Tracking

November 6, 2018 - 12:49pm #3

Hello,

PatrickL1 wrote:
  • Can we use more than one image marker (maybe 4) to center the component of the makeready in the middle of the 4 markers? 

You can, but I don't believe it is going to provide additional accuracy. Each target that is detected and tracked with Vuforia has a unique 6DoF pose (unique to each target), which is returned to the application layer. I don't believe a combination of the poses from each marker will increase accuracy, unless each marker is associated with some ground truth for it's position relative to the object.

PatrickL1 wrote:
  • Does the use of more than one image marker for one target optimize the precision?

Similar to my previous answer, each marker has a unique pose for it's position relative to the camera or world center. Thus, combining markers likely only works if you know the ground truth of the markers being used as reference.

PatrickL1 wrote:
  • Which marker type (Multi-marker / single image marker / object) gives the best values of precision?

My recommendation is to use 2D markers, such as our Image Target or Multi-Targets features. In reality, Multi-Targets operate very similarly to Image Targets in that you're really only tracking a single Image Target at a given time (whichever target is most visible to the device camera). However, Multi-Target has on distinct advantage in that you can define each target's position relative to a fixed place in the world.

https://library.vuforia.com/content/vuforia-library/en/articles/Training/Multi-Target-Guide.html

https://library.vuforia.com/articles/Solution/How-To-Modify-the-Dataset-Configuration-XML-File-Outside-the-Target-Manager#How-To-Modify-a-Multi-Target-Using-its-Config-XML-File

Thanks,

Vuforia Engine Support

Best Regards

Optimized Marker for Tracking

November 4, 2018 - 6:54pm #2

From experience, I'm gonna guess that multi marker with as many makers possible that are spread out as much as you can while still being visible in the scene would give you the best precision.  I don't have any hard evidence to back this up though.



 

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