QR code
QR Codes are an advanced alternative to UPC or bar codes, most common in Japan.
Unlike conventional bar codes, which store data horizontally, QR Codes store data vertically as well. This allows for hundreds of times more efficiency. One bar code can fit in 1/10th of the space of a QR Code.
These bar codes can be seen on anything from blimps to clothes to electronics. Consumers with capture programs and a PC with an RS-232C-interface may use a scanner to acquire the data.
In June of 2000, QR Codes were approved as an ISO International Standard (ISO/IEC18004).
Storage
| QR Code Data capacity | |
|---|---|
| Numeric only | Max. 7,089 characters |
| Alphanumeric | Max. 4,296 characters |
| Binary (8 bits) | Max. 2,953 bytes |
| Kanji, full-width Kana|Max. 1,817 characters |
| Error Correction Capacity | |
|---|---|
| Level L | 7% of codewords can be restored. |
| Level M | 15% of codewords can be restored. |
| Level Q | 25% of codewords can be restored. |
| Level H | 30% of codewords can be restored. |
Micro QR Code
Micro QR Code is a smaller version of the QR Code standard for applications with less ability to handle large scans.
There are different forms of Micro QR Code as well. The highest of these can hold 35 characters.
Use
[[1]] demonstrated how one could turn virtually anything into a QR Code by transforming a 1.5k (kilobyte) PNG file into an 8-part QR. This can be found [[2]].
External Links
Programs For Compiling QR Codes (Trial):