File:Chinese National Standard GBT 18284.pdf

Summary

This standard is not equivalent to ISO/IEC 18004:2000 "Automatic Identification and Data Collection Technology - Bar Code Symbol Technical Specification - QR Code". The QR code is a matrix two-dimensional code，which is arranged by square modules in a square graphic. The square graphic also includes a unique companion pattern at the three corners of the symbol that helps determine the position, size, and slope of the symbol. And the QR code has a large size range and provides 4 levels of error correction. The square module width can be determined by the user based on the conditions of the application.