For example, when I was in the identification of a picture, but did not show a complete picture, but vuforia object has been placed on the picture above, I hope to do is not shown in the full picture of the time to remind this sentence "Make sure you can see the whole page” Or identify a complete picture, the normal stage, in fact, the problem is that vuforia did not give us a threshold on the identification of the threshold, you can see the whole page "or to a separate AR object prompts, but identify the full picture, Dynamic monitoring of the value, I may not be able to find it, then trouble you give me some advice should be how to do, really grateful