A sticker over 15% of a QR code is fine. Erasing 0.7% of it kills the code.

Everyone repeats the same fact about QR codes: you can destroy about 30% of one and it still scans. It is the reason people put logos in the middle of them, and it is the reason a scuffed parking sign still works. I wanted to see it happen, so I generated codes at all four error-correction levels, damaged them in controlled ways, and fed each... Weiterlesen