title: QR code scan from image file
body: <p>Tried to use several libraries like ZXing, ZBar and their forks but didn't find way to scan barcode not from camera but from file.</p>
  
  <p>Can someone point me to right direction? Preferably I'm looking into ZXing: how to scan image from file (not from camera).</p>
  
  <p>Please.</p>