2D barcodes, winners and losers

Although 2D barcodes (also called QR codes – short for Quick Response) aren’t new, but they still haven’t caught on in the US. I’ve been asked by a lot of people "What is that?" when they see a QR code. To answer those people, they are postage stamp size or larger mathematical image that smartphones (with a high enough resolution camera) can read and convert to characters. Those characters can be a web address or a block of text or just about any input that a smartphone can …