title: Google Mobile vision api : how to detect and track more then 3 QR Codes?
body: <p>I want to make massive QR code scanning with Google Mobile Vision.
  I tried the sample APP from google (<a href="https://github.com/googlesamples/android-vision" rel="nofollow noreferrer">https://github.com/googlesamples/android-vision</a>)
  But it can tracks only 3 qr code at the same time : How can I increase this limit ?</p>
  
  <p>Note : I tried to scan this picture : <a href="https://www.flickr.com/photos/periodicvideos/5915143448/in/album-72157627314434233/" rel="nofollow noreferrer">https://www.flickr.com/photos/periodicvideos/5915143448/in/album-72157627314434233/</a></p>