Science Questions

What are 2D barcodes?

Sun, 31st Oct 2010

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Question

John, Northampton asked:

What are 2D barcodes?

Answer

Dave -   A normal bar code encodes information in black and white stripes, and there’s a very limited amount of data you can store because you can't get very many black and white stripes without making your product about the size of the planet.  So if you want to get more information on that, you can store the information, instead of in stripes, in spots.  You can't read it with a conventional bar code reader anymore because it can't scan across it.  It’s got to take a picture of it and then decode the picture, but this can store – instead of maybe 30 or 40 characters of data, it can store up to 3,000.  So you can actually store useful information about the product as well as just to identify it.

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