Even if you haven’t heard of the term ‘QR codes’ before, you have probably seen them. These codes, or rather barcodes, are cropping up on consumer products, in major publications and even on advertising hoardings. Invented in Japan, the QR code consists of a square pattern made up of black modules on a white background. They can be used to encode a URL, text or other data and can be decoded quickly by dedicated barcode readers and more recently camera [...]

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