article_snippet: Or QR codes - the square, 3D barcodes - are a more convenient alternative for smartphones with cameras, where an app can read the details encoded in the QR straight from the camera.
article_snippet: Alternatively,  QR codes (example pictured) are a  convenient way to store and access data using a smartphone camera . '
highlights_snippet: Or details could be encoded in QR codes photographed by a phone camera .
  