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Speed of detection 4ft away

March 29, 2021 - 6:47am #1


I have a client who has a product on the store shelf that is 9cm x 13cm. The image target I uploaded is 5 stars. The client would like the target to be found from up to 4ft away.  I have to get very close before the target is locked on using Vuforia (9.8.5) and Unity3d (2020.3.1f1) device Samsung Galaxy s10e.  How can I get the target to lock on faster from farther away?



Speed of detection 4ft away

March 31, 2021 - 12:22am #2

Hi rmroch,

The Vuforia SDK extracts feature points from the target (aka "marker") with each camera frame. Thus, the more distant the target becomes from the camera, the more difficult it will be for the algorithm to provide an accurate pose. You can estimate the minimum size that your target should have by dividing your camera-to-target distance by ~10. For instance, a 20 cm wide target would be detectable up to a distance of about 2 meters (20 cm x 10).

Note, however, that this is just a rough indication and the actual working distance/size ratio can vary based on lighting conditions, device camera properties, and target rating. The latter point is covered in the following article:

Thank you.

Vuforia Engine Support


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