QR codes

The characteristics of the QR code

In addition to its high decoding speed (hence its name Quick Response ), the QR code has certain characteristics that differentiate it from other bar codes. The first is its reception capacity.While a linear barcode can only encode about 30 alphanumeric characters, the QR code can contain up to 4,296, or about a hundred times that. The second characteristic is its density: it can contain the same amount of information as a linear barcode but in an area ten times smaller. The third is its ability to encode Chinese, Japanese, or Korean characters. The fourth particularity is its high level of reliability. A QR code,due to the redundancy of information, can be read even if part of it has been damaged or soiled. It is possible to use part of the code used for the redundancy of information to represent an image, a logo, a brand, etc. In this case, the code no longer has the same reliability.

Since 1994, the QR code has evolved to increase its possibilities. In 2004, QR microcode was released. By using only one positioning mark, it further increases the marking density by a factor of 5, i.e. it can encode the same information on an area five times smaller, but it limits the total information capacity at 35 encoded characters. The iQR code, developed in 2008 for industrial applications, introduced a rectangular format and offers an even greater density of information (+ 80%).

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