1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication Information technology Automatic identification and data capture techniques Aztec Code bar code symbology specification BS ISO/IEC 24778:2008National foreword This British Sta
2、ndard is the UK implementation of ISO/IEC 24778:2008. The UK participation in its preparation was entrusted to Technical Committee IST/34, Automatic identification and data capture techniques. A list of organizations represented on this committee can be obtained on request to its secretary. This pub
3、lication 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 35.040 Compliance with a British Standard cannot confer immun
4、ity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2012. Amendments issued since publication Date Text affected BRITISH STANDARD BS ISO/IEC 24778:2008Reference number ISO/IEC 24778:2008(E) ISO/IEC 2008 INT
5、ERNATIONAL STANDARD ISO/IEC 24778 First edition 2008-02-15 Information technology Automatic identification and data capture techniques Aztec Code bar code symbology specification Technologies de linformation Techniques didentification automatique et de capture des donnes Spcification pour la symbolo
6、gie de code barres du code Aztec BS ISO/IEC 24778:2008ISO/IEC 24778:2008(E) PDF disclaimer This 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
7、installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software
8、products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is fou
9、nd, please inform the Central 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
10、 microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the 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 r
11、eserved BS ISO/IEC 24778:2008ISO/IEC 24778:2008(E) ISO/IEC 2008 All rights reserved iii Contents Page Foreword. v Introduction. vi 1 Scope . 1 2 Normative references . 1 3 Terms, definitions, symbols and functions . 1 3.1 Terms and definitions. 1 3.2 Symbols and functions 2 4 Symbology characteristi
12、cs 3 4.1 Basic characteristics 3 4.2 Summary of additional features 4 5 Symbol description. 4 5.1 Symbol structure 5 5.2 Symbol character structure and sequence 6 5.3 Symbol size and capacity 7 6 General encodation procedures 8 7 Symbol structure 9 7.1 Fixed pattern structures. 9 7.2 Mode Message en
13、coding and structure . 10 7.3 Data message encoding and structure. 11 8 Structured Append .14 9 Reader initialization symbols 14 10 Extended Channel Interpretation 15 10.1 Encoding ECIs in Aztec Code 15 10.2 Code sets and ECIs 15 10.3 ECIs and Structured Append. 15 10.4 Post-decode protocol . 15 11
14、User considerations . 16 11.1 User selection of encoded message. 16 1 1 . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15、. . . . . . . . 1 6 11.3 User selection of Structured Append . 16 11.4 User selection of optional symbol formats 16 12 Dimensions 16 13 User guidelines . 17 13.1 Human readable interpretation 17 13.2 Autodiscrimination capability . 17 13.3 User-defined application parameters . 17 14 Reference decode
16、 algorithm . 17 14.1 Finding candidate symbols . 18 14.2 Processing the bullseye image . 18 14.3 Decoding the Core Symbol 18 14.4 Decoding the data message 19 14.5 Translating the datawords .20 15 Symbol quality 20 15.1 Symbol quality parameters 20 BS ISO/IEC 24778:2008ISO/IEC 24778:2008(E) iv ISO/I
17、EC 2008 All rights reserved 15.2 Symbol print quality grading . 21 15.3 Process control measurements. 22 16 Transmitted data .22 16.1 Basic interpretation 22 16.2 Protocol for FNC1 .22 16.3 Protocol for ECIs. 22 16.4 Symbology identifier. 23 16.5 Transmitted data example 23 A n n e x A (normative) A
18、 z t e c R u n e s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 A n n e x B (normative) Error detection and corre
19、ction.26 A n n e x C (normative) Topological bullseye search algorithm . 29 A n n e x D (normative) Linear crystal growing algorithm . 33 A n n e x E (normative) Fixed Pattern Damage grading . 34 A n n e x F (normative) Symbology identifiers 36 A n n e x G (informative) A ztec Code symbol encoding e
20、xample.37 A n n e x H (informative) A chieving minimum symbol size41 A n n e x I (informative) Useful process control techniques 43 Bibliography .45 BS ISO/IEC 24778:2008ISO/IEC 24778:2008(E) ISO/IEC 2008 All rights reserved v Foreword ISO (the International Organization for Standardization) and IEC
21、 (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with pa
22、rticular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international 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 es
23、tablished a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint tec
24、hnical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % 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
25、and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 24778 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 31, Automatic identification and data capture techniques. BS ISO/IEC 24778:2008ISO/IEC 24778:2008(E) vi
26、ISO/IEC 2008 All rights reserved Introduction A z t e c C o d e i s a t w o - d i m e n s i o n a l m a t r i x s y m b o l o g y w h o s e s y m b o l s a r e n o m i n a l l y s q u a r e , m a d e u p o f s q u a r e modules on a square grid, with a square bullseye pattern at their center. Aztec
27、Code symbols can encode from s m a l l t o l a r g e a m o u n t s o f d a t a w i t h u s e r - s e l e c t e d p e r c e n t a g e s o f e r r o r c o r r e c t i o n . Manufacturers of bar code equipment and users of the technology require publicly available standard symbology specifications towh
28、ich 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 1 Information technology Automatic identific
29、ation 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 A z t e c C o d e s y m b o l o g y c h a r a c t e r i s t i c s i n c l u d i n g d a t a c h a r a c t
30、 e r e n c o d a t i o n , r u l e s f o r e r r o r c o n t r o l e n c o d i n g , t h e g r a p h i c a l s y m b o l s t r u c t u r e , s y m b o l d i m e n s i o n s a n d p r i n t q u a l i t y r e q u i r e m e n t s , a r e f e r e n c e d e c o d i n g a l g o r i t h m , a n d u s e r -
31、 s e l e c t a b l e a p p l i c a t i o n p a r a m e t e r s . 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced docume
32、nt (including any amendments) applies. ISO/IEC 646:1991, Information technology ISO 7-bit coded character set for information interchange ISO/IEC 15415:2004, Information technology Automatic identification and data capture techniques Bar code print quality test specification Two-dimensional symbols
33、ISO/IEC 15424, Information technology Automatic identification and data capture techniques Data Carrier Identifiers (including Symbology Identifiers) ISO/IEC 19762 (all parts), Information technology Automatic identification and data capture (AIDC) techniques Harmonized vocabulary AIM Inc. Internati
34、onal Technical Specification: Extended Channel Interpretations Part 1, Identification Schemes and Protocols Part 2, Registration Procedure for Coded Character Sets and Other Data Formats Character Set Register 3 Terms, definitions, symbols and functions 3.1 Terms and definitions For the purposes of
35、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/IEC 24778:2008ISO/IEC 24778:2008(E) 2 ISO/IEC 2008 All rights reserved 3.1.2 checkword codeword which is included in
36、a symbol for error correction and/or error detection 3.1.3 dataword codeword which 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 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
37、s e d i n g r a p h i c a l encoding of the symbol 3.1.5 Mode Message short fixed-length, error-corrected subsidiary message within an Aztec Code symbol which directly encodes the symbols size and data message length 3.2 Symbols and functions 3.2.1 Mathematical symbols For the purposes of this docum
38、ent, the following mathematical symbols apply. B the number of bits in each codeword C b t h e s y m b o l c a p a c i t y i n n u m b e r o f b i t s C w t h e s y m b o l c a p a c i t y i n n u m b e r o f c o d e w o r d s D the number of data (message) codewords in the symbol K t h e n u m b e
39、r o f e r r o r c o r r e c t i o n c o d e w o r d s i n t h e s y m b o l , e q u a l t o C w- D L t h e n u m b e r o f d a t a l a y e r s ( 1 t o 3 2 ) i n t h e s y m b o l , d e f i n i n g i t s s i z e m the symbology identifier modifier value X the X-dimension or nominal square grid spacin
40、g x a g e n e r a l v a r i a b l e u s e d t o e x p r e s s e r r o r c o r r e c t i o n p o l y n o m i a l s ( x , y ) C a r t e s i a n c o o r d i n a t e s w i t h i n t h e m o d u l e g r i d 3.2.2 Mathematical functions and operations For the purposes of this document, the following mathe
41、matical functions and operations apply. a b s ( ) i s t h e a b s o l u t e v a l u e f u n c t i o n d i v i s t h e i n t e g e r d i v i s i o n o p e r a t o r max(a,b) is the greater of a and b m o d i s t h e r e m a i n d e r a f t e r i n t e g e r d i v i s i o n BS ISO/IEC 24778:2008ISO/IE
42、C 24778:2008(E) ISO/IEC 2008 All rights reserved 3 4 Symbology characteristics 4.1 Basic characteristics A z t e c C o d e i s a t w o d i m e n s i o n a l m a t r i x s y m b o l o g y w i t h t h e f o l l o w i n g b a s i c c h a r a c t e r i s t i c s : a . E n c o d a b l e c h a r a c t e r
43、 s e t : 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 . f o r v a l u e s 0 t o 1 2 7 , i n a c c o r d a n c e w i t h t h e U . S . n a t i o n a l v e r s i o n o f I S O / I E C 6 4 6 ; ( N O T E : T h i s v e r s i o
44、 n c o n s i s t s o f t h e G O s e t o f I S O / I E C 6 4 6 a n d t h e C O s e t o f I S O / I E C 6 4 2 9 w i t h v a l u e s 2 8 t o 3 1 m o d i f i e d t o F S , G S , R S a n d U S r e s p e c t i v e l y . ) b . f o r v a l u e s 1 2 8 - 2 5 5 , i n a c c o r d a n c e w i t h I S O / I E C
45、 8 8 5 9 - 1 . T h i s i n t e r p r e t a t i o n c o r r e s p o n d s t o E C I 0 0 0 0 0 3 . 2 . T w o n o n - d a t a c h a r a c t e r s c a n b e e n c o d e d , F N C 1 f o r c o m p a t i b i l i t y w i t h s o m e e x i s t i n g a p p l i c a t i o n s a n d E C I e s c a p e s e q u e n
46、 c e s f o r t h e s t a n d a r d i z e d e n c o d i n g o f m e s s a g e i n t e r p r e t a t i o n i n f o r m a t i o n . b . R e p r e s e n t a t i o n o f d a t a : A d a r k m o d u l e i s a b i n a r y o n e a n d a l i g h t m o d u l e i s a b i n a r y z e r o . c . S y m b o l s i z
47、 e : 1 . T h e s m a l l e s t A z t e c C o d e s y m b o l i s 1 5 x 1 5 m o d u l e s s q u a r e , a n d t h e l a r g e s t i s 1 5 1 x 1 5 1 . 2 . N o q u i e t z o n e i s r e q u i r e d o u t s i d e t h e b o u n d s o f t h e s y m b o l . d . D a t a c a p a c i t y ( a t r e c o m m e n
48、 d e d e r r o r c o r r e c t i o n l e v e l ) : 1 . T h e s m a l l e s t A z t e c C o d e s y m b o l e n c o d e s u p t o 1 3 n u m e r i c o r 1 2 a l p h a b e t i c c h a r a c t e r s o r 6 b y t e s o f d a t a . 2 . T h e l a r g e s t s y m b o l e n c o d e s u p t o 3 8 3 2 n u m e r
49、 i c o r 3 0 6 7 a l p h a b e t i c c h a r a c t e r s o r 1 9 1 4 b y t e s o f d a t a . e . S e l e c t a b l e e r r o r c o r r e c t i o n : 1 . U s e r - s e l e c t a b l e , f r o m 5 % t o 9 5 % o f t h e d a t a r e g i o n , w i t h a m i n i m u m o f 3 c o d e w o r d s . 2 . R e c o m m e n d e d l e v e l i s 2 3 % o f s y m b o l c a p a c i t y p l u s 3 c o d e w o r d s . f . C o d e t y p e : M a t r i x g . O r i e n t a t i o n i n d e p e n d e n t : Y e s BS ISO/IEC 24778:
