2D codes consist of polygonal, usually squarely arranged groups of data cells with a typical orientation symbol by which the code type can be recognized. Frequently used examples are the QR code and the Data Matrix code. See also Barcode. 2D codes have built-in error correction, which enables data to be recovered even if the […]
The QR code (Quick Response Code; 2D code) was developed at Denso (Japan) in 1994. It is square and easy to recognize thanks to its search aids, light and dark squares nested in each other in three corners. The symbol elements are squares, of which there are at least 21 x 21 and a maximum […]
