1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationInformation technology Automatic identification and data capture techniques Aztec Code bar code symbology specificationBS ISO/IEC 24778:2008National forewordThis British Standard
2、 is the UK implementation of ISO/IEC 24778:2008.The UK participation in its preparation was entrusted to Technical CommitteeIST/34, Automatic identification and data capture techniques.A list of organizations represented on this committee can be obtained on request to its secretary.This publication
3、does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012.Published by BSI Standards Limited 2012 ISBN 978 0 580 56583 0 ICS 35.040Compliance with a British Standard cannot confer immunity from le
4、gal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2012.Amendments issued since publicationDate Text affectedBRITISH STANDARDBS ISO/IEC 24778:2008Reference number ISO/IEC 24778:2008(E)ISO/IEC 2008INTERNATIONAL STANDAR
5、DISO/IEC 24778First edition 2008-02-15Information technology Automatic identification and data capture techniques Aztec Code bar code symbology specificationTechnologies de linformation Techniques didentification automatique et de capture des donnes Spcification pour la symbologie de code barres du
6、code AztecBS ISO/IEC 24778:2008ISO/IEC 24778:2008(E)PDF disclaimerThis PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer
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9、 Secretariat at the address given below.COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission
10、 in writing from either ISO at the address below or ISOs member body in the country ofthe requester.ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org ii ISO/IEC 2008 All rights reservedBS ISO/IEC 24778:2008ISO/
11、IEC 24778:2008(E) ISO/IEC 2008 All rights reserved iiiContents PageForeword.vIntroduction. vi1 Scope .12 Normative references.13 Terms, definitions, symbols and functions . 13.1 Terms and definitions. 13.2 Symbols and functions 24 Symbology characteristics 34.1 Basic characteristics 34.2 Summary of
12、additional features 45 Symbol description. 45.1 Symbol structure 55.2 Symbol character structure and sequence 65.3 Symbol size and capacity 76 General encodation procedures 87 Symbol structure 97.1 Fixed pattern structures.97.2 Mode Message encoding and structure. 107.3 Data message encoding and str
13、ucture. 118 Structured Append .149 Reader initialization symbols 1410 Extended Channel Interpretation 1510.1 Encoding ECIs in Aztec Code 1510.2 Code sets and ECIs 1510.3 ECIs and Structured Append.1510.4 Post-decode protocol. 1511 User considerations .1611.1 User selection of encoded message. 161 1
14、. 2 U s e r s e l e c t i o n o f m i n i m u m e r r o r c o r r e c t i o n l e v e l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 611.3 User selection of Structured Append . 1611.4 Use
15、r selection of optional symbol formats 1612 Dimensions 1613 User guidelines. 1713.1 Human readable interpretation 1713.2 Autodiscrimination capability . 1713.3 User-defined application parameters . 1714 Reference decode algorithm .1714.1 Finding candidate symbols . 1814.2 Processing the bullseye ima
16、ge . 1814.3 Decoding the Core Symbol 1814.4 Decoding the data message 1914.5 Translating the datawords.2015 Symbol quality 2015.1 Symbol quality parameters 20BS ISO/IEC 24778:2008ISO/IEC 24778:2008(E)iv ISO/IEC 2008 All rights reserved15.2 Symbol print quality grading .2115.3 Process control measure
17、ments. 2216 Transmitted data .2216.1 Basic interpretation 2216.2 Protocol for FNC1 .2216.3 Protocol for ECIs.2216.4 Symbology identifier.2316.5 Transmitted data example23An n e x A (normative) Az t e c R u n e s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4An n e x B (normative) Error detection and correction.26An n e x C (normative) Topological bullseye search algorithm .29An n e x D (normative) Linear crystal
19、 growing algorithm.33An n e x E (normative) Fixed Pattern Damage grading .34An n e x F (normative) Symbology identifiers36An n e x G (informative) Aztec Code symbol encoding example.37An n e x H (informative) Achieving minimum symbol size41An n e x I (informative) Useful process control techniques43
20、Bibliography .45BS ISO/IEC 24778:2008ISO/IEC 24778:2008(E) ISO/IEC 2008 All rights reserved vForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are m
21、embers of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international
22、organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the IS
23、O/IEC Directives, Part 2.The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval byat least 75
24、 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying anyor all suchpatent rights. ISO/IEC 24778 was prepared by Joint Technical Committ
25、ee ISO/IEC JTC1, Information technology, Subcommittee SC 31, Automatic identification and data capture techniques. BS ISO/IEC 24778:2008ISO/IEC 24778:2008(E)vi ISO/IEC 2008 All rights reservedIntroduction Aztec Code is a two-dimensional matrix symbology whose symbols are nominally square, made up of
26、 square modules on a square grid, with a square bullseye pattern at their center. Aztec Code symbols can encode from small to large amounts of data with user-selected percentages of error correction. Manufacturers of bar code equipment and users of the technology require publicly available standard
27、symbology specifications towhich they can referwhen developing equipment and application standards. The publication of standardised symbology specifications is designed to achieve this. BS ISO/IEC 24778:2008INTERNATIONAL STANDARD ISO/IEC 24778:2008(E) ISO/IEC 2008 All rights reserved 1Information te
28、chnology Automatic identification and data capture techniques Aztec Code bar code symbology specification 1 Scope This International Standard defines the requirements for the symbology known as Aztec Code. It specifies the Aztec Code symbology characteristics including data character encodation, rul
29、es for error control encoding, the graphical symbol structure, symbol dimensions and print quality requirements, a reference decoding algorithm, and user-selectable application parameters.2 Normative referencesThe following referenced documents are indispensable for the application of this document.
30、 For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including anyamendments) applies.ISO/IEC 646:1991, Information technology ISO 7-bit coded character set for information interchangeISO/IEC 15415:2004, Information technology
31、Automatic identification and data capture techniques Bar code print quality test specification Two-dimensional symbolsISO/IEC 15424, Information technology Automatic identification and data capture techniques Data Carrier Identifiers (including Symbology Identifiers)ISO/IEC 19762 (all parts), Inform
32、ation technology Automatic identification and data capture (AIDC) techniques Harmonized vocabularyAIM Inc. International Technical Specification: Extended Channel Interpretations Part 1, Identification Schemes and Protocols Part 2, Registration Procedure for Coded Character Sets and Other Data Forma
33、ts Character Set Register3 Terms, definitions, symbols and functions 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in ISO/IEC 19762 and the following apply. 3.1.1 bullseye set of concentric square rings used as the finder pattern in Aztec Code BS ISO/IE
34、C 24778:2008ISO/IEC 24778:2008(E)2 ISO/IEC 2008 All rights reserved3.1.2 checkword codewordwhich is included in a symbol for error correction and/or error detection 3.1.3 dataword codewordwhich is part of the data message encoded in a symbol 3.1.4 domino 2 - m o d u l e s u b - s t r u c t u r e o f
35、 t h e s y m b o l c h a r a c t e r i n A z t e c C o d e w h i c h i s t h e e l e m e n t a l e n t i t y u s e d i n g r a p h i c a l encoding of the symbol3.1.5 Mode Message short fixed-length, error-corrected subsidiary message within an Aztec Code symbol which directly encodes the symbols si
36、ze and data message length 3.2 Symbols and functions3.2.1 Mathematical symbols For the purposes of this document, the following mathematical symbols apply.B the number of bitsineachcodewordCbthe symbol capacity in number of bitsCwthe symbol capacity in number of codewordsD the number of data(message
37、)codewords inthe symbolK the number of error correction codewords in the symbol, equal to Cw- DL the number of data layers (1 to 32) in the symbol, defining its sizem the symbologyidentifier modifiervalue X the X-dimensionor nominal square gridspacing x a general variable used to express error corre
38、ction polynomials(x,y) Cartesian coordinates within the module grid 3.2.2 Mathematical functions and operationsFor the purposes of this document, the following mathematical functions and operations apply.abs() is the absolute value functiondiv is the integer division operatormax(a,b) is thegreaterof
39、 a and b mod is the remainder after integer divisionBS ISO/IEC 24778:2008ISO/IEC 24778:2008(E) ISO/IEC 2008 All rights reserved 34 Symbology characteristics 4.1 Basic characteristics Aztec Code is a two dimensional matrix symbology with the following basic characteristics:a. Encodable character set:
40、1 . A l l 8 - b i t v a l u e s c a n b e e n c o d e d . T h e d e f a u l t i n t e r p r e t a t i o n s h a l l b e :a. for values 0 to 127, in accordance with the U.S. national version of ISO/IEC 646;(NOTE: This version consists of the GO set of ISO/IEC 646 and the CO set of ISO/IEC 6429 with v
41、alues 28 to 31 modified to FS, GS, RS and US respectively.)b. for values 128 - 255, in accordance with ISO/IEC 8859-1. This interpretation corresponds to ECI 000003. 2. Two non-data characters can be encoded, FNC1 for compatibility with some existing applications and ECI escape sequences for the sta
42、ndardized encoding of message interpretation information.b. Representation of data: A dark module is a binary one and a light module is a binary zero.c. Symbol size:1. The smallest Aztec Code symbol is 15 x 15 modules square, and the largest is 151 x 151.2. No quiet zone is required outside the boun
43、ds of the symbol.d. Data capacity (at recommended error correction level): 1. The smallest Aztec Code symbol encodes up to 13 numeric or 12 alphabetic characters or 6 bytes of data. 2. The largest symbol encodes up to 3832 numeric or 3067 alphabetic characters or 1914 bytes of data.e. Selectable err
44、or correction: 1. User-selectable, from 5 % to 95 % of the data region, with a minimum of 3 codewords. 2. Recommended level is 23 % of symbol capacity plus 3 codewords.f. Code type: Matrixg. Orientation independent: Yes BS ISO/IEC 24778:2008ISO/IEC 24778:2008(E)4 ISO/IEC 2008 All rights reserved4.2
45、Summary of additional features The following summarizes additional features that are inherent or optional in Aztec Code:a. Reflectance Reversal (Inherent): Though Aztec Code symbols are shown and described in this specification always with the finders center dark and with dark modules encoding binar
46、y 1s throughout, symbols exhibiting the opposite reflectance characteristics are easily autodiscriminated and decoded with the standard reader.b. Mirror Image (Inherent): Images which contain an Aztec Code symbol in mirror reversal, either because they are obtained using a reflected optical path, a
47、reversed scan direction, or from behind through a clear substrate, are easily autodiscriminated and decoded with the standard reader.c. Extended Channel Interpretation (Optional): The ECI mechanism enables characters from various character sets (e.g. Arabic, Cyrillic, Greek, Hebrew) and other data i
48、nterpretations or industry-specific requirements to be represented.d. Structured Append (Optional): Structured Append allows files of data to be represented logically and continually in up to 26 Aztec Code symbols. The symbols may be scanned in any sequence to enable the original data to be correctl
49、y reconstructed.e. Reader Initialization Symbols (Optional): A distinct format of Aztec Code symbol is available for use in barcode menus for reader initialization. The encoded message in these special symbols is never passed on to an application.f. Aztec “Runes” (Optional): a series of 256 small, machine-readable marks compatible with Aztec Code are available for special applications. See Annex A.5 Symbol description Aztec Code symbols are nominally square, made up of square modules on a square gri
