QR Code Overview
QR Code is a kind of 2D (two-dimensional) barcode symbology developed by Denso Wave (a division of Denso Corporation at the time) and released in 1994. It was developed with the primary aim of being a symbol that is easily interpreted by scanner equipment. This type of barcode is capable of handling all types of data, such as numeric and alphabetic characters, Kanji, Kana, Hiragana, symbols, binary, and control codes. The symbol versions of QR Codes range from Version 1 to Version 40. Each version has a different module configuration or number of modules (the module refers to the black and white dots that make up QR Codes.) “Module configuration” refers to the number of modules contained in a symbol, commencing with Version 1 (21 x 21 modules) up to Version 40 (177 x 177 modules). Each consecutive version number comprises 4 additional modules per side. Each QR Code symbol version has the maximum data capacity according to the amount of data, character type, and error correction level. In other words, as the amount of data increases, more modules are required to comprise the QR Code, resulting in larger barcodes. QR Codes have error correction capability to restore data if the code is dirty or damaged. Four error correction levels are available for users to choose according to the operating environment. Raising this level improves error correction capability but also increases the amount of data QR Code size. To select error correction level, various factors such as the operating environment and QR Code size need to be considered. Level Q or H may be selected for factory environment where QR Codes get dirty, whereas Level L may be selected for clean environment with the large amount of data. Typically, Level M (15%) is most frequently selected. The QR Code error correction feature is implemented by adding a Reed-Solomon Code to the original data.
QR Code is also known as
- Denso Barcode
- QRCode
- Quick Response Code
- JIS X 0510
- ISO/IEC18004
