Research on Data Encoding of Two-Dimensional QR Code Barcode

In order to represent the information with high capacity and Chinese characters with high efficiency in two-dimensional barcode, quick response code (QR code) is needed. QR code is capable to encode all types of data, such as numeric and alphabetic characters, binary and Chinese characters etc. An input character in Chinese mode is compacted to 13 bit binary codewords, and prefixed with the mode indicator, Chinese subset indicator, and the character count indicator. In GB/T 18284-2000, many errors are found when encoding input data in Chinese mode. The message bit stream produced exceeds the symbol data capacity according to GB/T 18284-2000. Three revisions were presented to change the data capacity in Chinese mode of national standard. Expriment results show that these methods are usable and efficient.