Let’s take a look at of probably the most widespread kinds of 2-D bar codes, QR Codes, to see how its design helps bar code scanners learn the data it incorporates. For starters, each QR Code contains a finder sample, an association of squares that help the scanner detect the scale of the QR Code, the path it’s going through and even the angle at which the code is being scanned. Next, each QR Code comprises an alignment pattern, one other pattern of squares devised to help scanners decide if the 2-D bar code is distorted (maybe it’s positioned on a round surface, for instance). QR Codes even have margins for error, which means that even if part of the code is smudged or obscured, the code can usually still be scanned.
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