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For those who want to know more, there are 640 variations of the standard square QR code. Which one is used is based on the length of message, the format of the message and the level of error correction required. Level of correction depends on where the code is going to be placed for scanning - sticking one on the handle of a broom for example requires higher error correction since the scanner will not read it as easily as when on a flat surface.
There are at present 5 different profiles for the code, the common square one, a rectangular one (often used for addresses on letters so will appear in the envelope window), a micro one, one with a 'hole' to display an image and one that has encryption so only scanners with the appropriate key can read it.
What they all have in common is the large square top left which the scanner uses as a reference point for everything else.
Although the generation of a QR code is to a single international standard, scanners do vary in their capabilities (a scanner might be a specific device like a barcode reader or the software that will interpret a camera image). Some will not read anything other than the standard square, some don't have the ability to hold an encryption key for example.
There are at present 5 different profiles for the code, the common square one, a rectangular one (often used for addresses on letters so will appear in the envelope window), a micro one, one with a 'hole' to display an image and one that has encryption so only scanners with the appropriate key can read it.
What they all have in common is the large square top left which the scanner uses as a reference point for everything else.
Although the generation of a QR code is to a single international standard, scanners do vary in their capabilities (a scanner might be a specific device like a barcode reader or the software that will interpret a camera image). Some will not read anything other than the standard square, some don't have the ability to hold an encryption key for example.
