How QR codes work is by conveying information through a graphical code of B&W pixels. ... The four-bit pattern in the lower-right of the QR code (marked “Enc” in the diagram above) determines how the ...

First, you need a QR-code app and a smartphone or tablet equipped with a camera. iOS users should check out RedLaser.Android fans can try either RedLaser or QR Droid.Both of these apps are free to ...