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Vuforia does not "sometimes" detect target.

March 19, 2015 - 2:11pm #1

When I run the Vuforia sample app using Image targets, the detection of the target is pretty instaneous i.e. as soon as I bring the target in front of the camera, it draws a teapot on the target.

But I am trying to use Vuforia api as part of my larger android application. There, somehow, it seems to take longer to detect the target and start tracking. I have to show the target to the camera for anywhere between 5-30 seconds before it is detected. When it gets detected, it is tracked quite well. When I print out the result of state.getNumTrackableResults() function, it shows me 0 for quite some time even when the target is in full view. 

Same thing happens when I take the target out of camera view and then bring it back. The detection of the target is not instantaneous. FYI, I am using smaller sized stones and chips images which I have verified to work flawlessly with Vuforia sample app. Any idea why this is happening ?

gaurav79ee
Joined:
January 20, 2015
Posts: 1
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Vuforia does not "sometimes" detect target.

February 28, 2018 - 3:59am #5

I am also facing the same problem!I got a clue that TrackingFound and TrackingLost method/functionality of the Master function  "OnTrackableStateChanged" which is the manifestation of ITrackableEventHandler interface.The System might toggle between rackingFound and TrackingLost.It is only my suspicion.

hariSbaabu
Joined:
February 27, 2018
Posts: 2
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Vuforia does not "sometimes" detect target.

February 18, 2018 - 12:17pm #4

Hi, it was a nightmare for me until I found out that I had more than 1 equal images in my targets. 

image 1 and image 2 equal. so vufuria sometimes detected 1 and sometimes 2. but my 3d model was in the first one.

 

ViniTeixeira
Joined:
June 8, 2017
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Vuforia does not "sometimes" detect target.

September 15, 2017 - 4:35pm #3

Hello,

What is the star quality of the images you are experiencing this issue with? Also, what other actions are occurring in your app when you encounter this issue?

Thanks,

-Vuforia Support

Strasza
Joined:
June 13, 2017
Posts: 1718
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Vuforia does not "sometimes" detect target.

September 15, 2017 - 1:47pm #2

hey! did you actually find the cause of this? im having the same problem and cant for the life of me, figure out what the problem is for the tracking to be sometimes pretty fast, sometimes to take lots of time to even recognize the image, and sometimes to not even work at all! i mean, i paid a lot of money for this, shouldnt this be working as intended?

julianbraso
Joined:
September 7, 2017
Posts: 1
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