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Unreliable image detection

April 20, 2016 - 6:43am #1



OSX 10.11.4
Unity 5.3.3p3 set to iOS
Vuforia 5.5.9

My 8 markers all have 5 star ratings. 

General behavior within my main unity project is that the markers are either not detected or after about 20 seconds of trying it'll suddenly detect it.
1 Marker works fine. 

I've tried running the core examples in the same editor but only 2 of the 3 images work. Tarmac will not detect. Made new markers that had a 0 star rating.
Seemed to work a bit better but in general still the same behavior.

ARCamera and ImageTarget settings are pretty much default. AR bundle has been selected and set to active.

Are there any known issues or solutions i could try?




Unreliable image detection

April 21, 2016 - 9:11am #6

Painstakingly managed to get new markers made and okayed by the client.

Cannot believe it was that, in prior versions it wasnt THAT accurate. Then again this is the first time we're using 8 markers in 1 project so fari enough.


I do apologise.

Unreliable image detection

April 20, 2016 - 4:13pm #5

It sounds like you will need more distributed and unique feature points in your target to get better recognition. The stones and chips targets are best practice reference examples you can use to compare in the same environmental conditions. Targets are recognized in grayscale, not color. Click Show Features in Target Manager to see what the target looks like in grayscale. See this guide for tips on ideal target features:



Unreliable image detection

April 20, 2016 - 3:35pm #4

One of the things i have done earlier was make a unique image with a colored background, thin frames and a faded out logo. Same behavior persisted.


Unreliable image detection

April 20, 2016 - 3:00pm #3

8 of the targets in your DB have the same frame border which is where the majority of the feature points are located. This translates to very few unique feature points across those images. Ideal targets should have an even distribution of feature points which are unique across targets. You might try exporting a dataset with only the 'food' target and turn off all other datasets in your app and see if the recognition improves.

Unreliable image detection

April 20, 2016 - 10:44am #2

Banging my head against the desk now. Tested in 3 different unity versions and it's the same across the board. One time the marker does get detected right off of the bat and works fine. I switch scenes and it stops working.

Really need some support as this is for an installation for the city of Amsterdam.

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