When a barcode is printed on paper, a white pixel does not affect
its neighboring black pixels provided that the print quality is
good and the resolution is high enough. On the other hand, when
data is shown on an LCD, light that is passing through white
pixels may leak into neighboring black pixelsmaking them look
gray. The straightforward solution to this problem is to increase
the size of the pixels so that they have minimal effects on each
other. This is called barcode granularity in QR coding [2]. On
a lower level this is exactly the way a printed barcode is generated,
where each printed dot is not corresponding to a data
symbol but rather many printer dots contribute to a single black
symbol.