INTERNATIONAL STANDARD ISO/IEC 18004 Information technology — Automatic identification and data capture techniques 帮助大家深入理解二维码的原理soEC18004:2006(E Contents Page Foreword Introduction Scope . Conformance Normative references wwwwwwwwwwwwwwww 1 Terms and definitions, mathematical and logical symbols, abbreviations and conventions.. 2 4.1 Terms and definitions 温a温 1面 量面日1面面 4.2 Mathematical and logical symbols………,,… 4.3 Abbreviations…… 4.4 Conventions 4.4.1 Module positions 5 4.4.2 Byte notation 4.4.3 Version references Symbol description 5.1 Basic cha『 acteristics… 5.2 Summary of additional features 53 Symbol structure…. 5.3.1 Symbol Versions and sizes 5.3.2 Finder pattern 16 5.3.3 Separator 17 534 Timing pattern.…… 5.3.5 Alignment patterns 17 5.3.6 Encoding region 17 5.3.7 Quiet zone 17 Requirements 18 61 Encode procedure overview.....….…. 18 6.2 Data analysis 20 6.3 Modes 20 6.3.1 Extended Channel Interpretation(ECI)mode 20 6.3.2 Numeric mode 画画面画面 6.3.3 Alphanumeric mode 20 634 Byte mo