QR Code Scanning Distance

For most smartphones the relationship between scan distance and minimum QR code size is approximately 10:1 so a 25 mm QR code printed in a magazine will have a nominal effective scan distance of about 25 cm (Source: http://blog.qrstuff.com/2011/01/18/what-size-should-a-qr-code-be)

The size of standard non-personalised licence plates in Australia is 37.2 cm × 13.4 cm, which would have a range of three metres when being scanned by a smartphone.

 

What this means? For speed cameras to scan QR Codes on vehicles, cameras would need long range lenses, which could be focused within 3 metres from the plate.

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