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Hour 20. Creating QR and Tag Codes > Delving into QR and Tag Codes

Delving into QR and Tag Codes

Barcodes are heavily used in inventory tracking. When you want to buy an item at a store, a barcode is usually scanned at the register, displays how much the product costs, and makes a mark in the store inventory that the item was sold. The entire transaction is facilitated by the few characters of information held in the barcode on the item. This same principle of containing data also works on Quick Response (QR) codes and Tag codes.

Standard barcodes are read along a single axis; this makes them known as 1D or one-dimensional codes. This single axis of data limits the amount of data available but makes the code easily read by a scanner. QR codes are read along the X and Y axis, making them 2D or two-dimensional codes. This allows more data to be stored inside the same area as a barcode. Due to the complexity of the layout, some scanning devices may not scan the code correctly as it may be too small to be read. Microsoft Tag codes work in a similar but proprietary fashion. The Tag is read by a scanner and then referenced against an online database to deliver data back to the scanning application.


  

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