I have now tried to further test Vuforia and it is not very effective...
It cannot track multiples of the same image.
A trackable image must be held very closely to the camera for it to be recognized.
If a tracked image ever leaves frame, or becomes occluded, it will become untracked.
By being very careful, I was able to have Vuroria track up to 6 target images, but given the above restrictions, it is very cumbersome to maintain them.
How many image targets can we track?
How many different images can we store?