1、BRITISH STANDARD BS ISO/IEC 24728:2006 Information technology Automatic identification and data capture techniques MicroPDF417 bar code symbology specification ICS 35.040 BS ISO/IEC 24728:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 3
2、0 June 2006 BSI 2006 ISBN 0 580 48693 1 National foreword This British Standard reproduces verbatim ISO/IEC 24728:2006 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee IST/34, Automatic identification and data capture techniq
3、ues, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section
4、entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compl
5、iance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related int
6、ernational and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO/IEC title page, pages ii to vii, a blank page, pages 1 to 115 and a back cover. The BSI copyright notice displayed in this document indicates whe
7、n the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO/IEC 24728:2006(E)INTERNATIONAL STANDARD ISO/IEC 24728 First edition 2006-06-01 Information technology Automatic identification and data capture techniques MicroPDF417 bar code symbology sp
8、ecification BS ISO/IEC 24728:2006ii iii Contents Page Foreword vi Introduction vii 1 Scope 1 2 Normative references 1 3 Terms and definitions .2 4 Symbols, operations and abbreviated terms4 4.1 Symbols 4 4.2 Mathematical operations.5 4.3 Abbreviated terms .5 5 Requirements.5 5.1 Symbology characteri
9、stics .5 5.1.1 Basic characteristics.5 5.1.2 Summary of additional features.6 5.2 Symbol structure .7 5.2.1 MicroPDF417 symbol parameters7 5.2.2 Row and column combinations9 5.2.3 Row parameters.10 5.2.4 Codeword sequence10 5.2.5 MicroPDF417 Row Address Patterns.12 5.3 Basic encodation .14 5.3.1 Sym
10、bol character structure 14 5.3.2 Start and Stop Patterns.15 5.4 High level (data) encodation.15 5.4.1 Function codewords15 5.4.2 Text Compaction mode .21 5.4.3 Byte Compaction mode.25 5.4.4 Numeric Compaction mode 27 5.4.5 Advice to select the appropriate compaction mode 28 5.4.6 Treatment of MicroP
11、DF417 reserved codewords.29 5.5 Extended Channel Interpretation .29 5.5.1 Encoding the ECI assignment number30 5.5.2 Pre-assigned and default Extended Channel Interpretations .31 5.5.3 Encoding ECI sequences within compaction modes 31 5.5.4 Post-decode protocol33 5.6 Determining the codeword sequenc
12、e33 5.7 Error detection and correction.34 5.7.1 Number of error correction codewords.34 5.7.2 Error correction capacity 34 5.7.3 Defining the error correction codewords35 5.8 Dimensions.35 5.8.1 Minimum width of a module (X)35 5.8.2 Row height (Y)35 5.8.3 Quiet zones.35 5.9 Defining the symbol forma
13、t 35 5.9.1 Defining the aspect ratio of the module 36 5.9.2 Defining the symbol matrix of rows and columns .36 5.10 Generating the error correction codewords .37 5.11 Low level encodation 39 5.11.1 Clusters.40 BS ISO/IEC 24728:2006iv 5.11.2 Determining the symbol matrix . 40 5.11.3 Determining the v
14、alues of the Row Address Patterns 40 5.11.4 Row encoding 46 5.12 Printing Row Address Patterns . 46 5.13 Structured Append 47 5.13.1 Compaction modes and Structured Append 47 5.13.2 ECIs and Structured Append . 47 5.14 User guidelines . 47 5.14.1 Human readable interpretation 47 5.14.2 Autodiscrimin
15、ation capability 47 5.14.3 User-defined application parameters 48 5.14.4 MicroPDF417 symbol quality . 48 5.14.5 Separation of multiple symbols. 49 5.15 Reference decode algorithm 49 5.16 Error detection and error correction procedure 49 5.17 Transmitted data . 49 5.17.1 Transmitted data in the basic
16、 (default) interpretation. 49 5.17.2 Transmission protocol for Extended Channel Interpretation (ECI) . 49 5.17.3 Transmitted data for Structured Append51 5.17.4 Transmission of reserved codewords using the ECI protocol. 51 5.17.5 Symbology identifier. 51 5.17.6 Transmission using older protocols. 51
17、 Annex A (normative) Encoding/decoding table of PDF417 symbol character bar-space sequences. 52 Annex B (normative) The default character set for Byte Compaction mode . 67 Annex C (normative) Byte Compaction mode encoding algorithm 68 Annex D (normative) Numeric Compaction mode encoding algorithm 70
18、 Annex E (normative) Error correction 72 Annex F (normative) Tables of coefficients for calculating MicroPDF417 error correction codewords . 73 Annex G (normative) Text Compaction mode encoding algorithm. 77 Annex H (normative) Structured Append MicroPDF417 symbols . 78 H.1 Structured Append overvie
19、w . 78 H.2 Structured Append syntax . 78 H.3 High level encoding considerations . 81 H.4 Encodation example . 81 H.5 Structured Append and the Extended Channel Interpretation protocol . 82 H.6 Structured Append data transmission 83 Annex I (normative) Testing MicroPDF417 symbol quality 86 I.1 Overvi
20、ew of methodology 86 I.2 Test scans for scan reflectance profile 86 Annex J (normative) Reference decode algorithm for MicroPDF417 88 J.1 Phase 1: Initialization 88 J.2 Phase 2: Filling the matrix 89 J.3 Phase 3: Interpretation . 90 J.4 Reference line-decode algorithm 91 Annex K (normative) Error co
21、rrection procedures . 95 Annex L (normative) Symbology identifier 97 Annex M (normative) Transmission protocol for decoders conforming with original PDF417 standards. 98 M.1 Basic Channel Mode . 98 M.2 GLI encoded symbols. 98 M.3 Structured Append symbols 100 M.4 Transmission of reserved codewords u
22、sing the original PDF417 protocol . 101 BS ISO/IEC 24728:2006v M.5 Achieving compatibility between old and new PDF417 equipment .101 Annex N (informative) Algorithm to minimise the number of codewords.104 Annex O (informative) Guidelines to determine the symbol matrix.106 Annex P (informative) Calcu
23、lating the coefficients for generating the error correction codewords worked example 107 Annex Q (informative) Generating the error correction codewords worked example 109 Annex R (informative) Division circuit procedure for generating error correction codewords112 Annex S (informative) Additional g
24、uidelines for the use of MicroPDF417113 S.1 Autodiscrimination compatibility.113 S.2 Pixel-based printing 113 Bibliography 115 BS ISO/IEC 24728:2006vi Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system
25、 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 particular fields of technical activity. ISO and IEC technical committees coll
26、aborate 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 established a joint technical committee, ISO/IEC JTC 1. International Standard
27、s 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 technical committee are circulated to national bodies for voting. Publication a
28、s 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 and IEC shall not be held responsible for identifying any or all such patent
29、 rights. ISO/IEC 24728 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 31, Automatic Identification and data capture techniques. This International Standard contains many provisions which are identical with those of ISO/IEC 15438. BS ISO/IEC 24728:200
30、6vii Introduction MicroPDF417 is a multi-row symbology, derived from and closely based on PDF417. MicroPDF417 is designed for applications with a need for improved area efficiency but without the requirement for PDF417s maximum data capacity. A limited set of symbol sizes is available, together with
31、 a fixed level of error correction for each symbol size. Module dimensions are user-specified to enable symbol production and reading by a wide variety of techniques. Since MicroPDF417s data character encodation, its error correction method, and many of its other symbol characteristics are, and are
32、intended to remain, identical to those of PDF417, descriptions of these characteristics are quoted verbatim from the PDF417 symbology specification (ISO/IEC 15438) wherever appropriate, or with the appropriate modifications. For ease of cross-reference, this International Standard follows a similar
33、document structure, with minor differences in clause/subclause numbering, to ISO/IEC 15438. BS ISO/IEC 24728:2006blank1 Information technology Automatic identification and data capture techniques MicroPDF417 bar code symbology specification 1 Scope This International Standard specifies the requireme
34、nts for the bar code symbology known as MicroPDF417. It specifies the MicroPDF417 symbology characteristics, data character encodation, symbol formats, dimensions, error correction rules, decoding algorithm, and a number of application parameters. 2 Normative references The following referenced docu
35、ments 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 document (including any amendments) applies. ISO/IEC 646:1991, Information technology ISO 7-bit coded character set for inf
36、ormation interchange ISO/IEC 8859-1, Information technology 8-bit single-byte coded graphic character sets Part 1: Latin alphabet No. 1 ISO/IEC 15415, Information technology Automatic identification and data capture techniques Bar code print quality test specification Two-dimensional symbols ISO/IEC
37、 15417, Information technology Automatic identification and data capture techniques Bar code symbology specification Code 128 ISO/IEC 15418, Information technology EAN/UCC Application Identifiers and Fact Data Identifiers and Maintenance ISO/IEC 15424, Information technology Automatic identification
38、 and data capture techniques Data Carrier Identifiers (including Symbology Identifiers) ISO/IEC 24723, Information technology Automatic identification and data capture techniques EAN.UCC Composite bar code symbology specification ISO/IEC 19762-1, Information technology Automatic identification and d
39、ata capture (AIDC) techniques Harmonized vocabulary Part 1: General terms relating to AIDC ISO/IEC 19762-2, Information technology Automatic identification and data capture (AIDC) techniques Harmonized vocabulary Part 2: Optically readable media (ORM) AIM Inc. International Technical Standard: ITS/0
40、4-001, Extended Channel Interpretations Part 1: Identification Schemes and Protocols 1GS1 General Specification 21Published by AIM Global, 125 Warrendale-Bayne Road, Suite 100, Warrendale, PA 15086, USA. 2Published by GS1, Blue Tower, Avenue Louise 326, bte 10, B-1050 Brussels, Belgium. BS ISO/IEC 2
41、4728:20062 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO/IEC 19762-1, ISO/IEC 19762-2 and the following apply. 3.1 application identifier sequence of 2 to 4 digits, used to define the nature or use of the subsequent data characters, in accordance w
42、ith ISO/IEC 15418 and the GS1 General Specification 3.2 bar-space sequence sequence which represents the module widths of the elements of a symbol character 3.3 basic channel mode standard system for encoding and transmitting bar code data where data message bytes are output from the decoder but no
43、control information about the message is transmitted 3.4 cluster any of three mutually exclusive subsets of PDF417 symbol characters, also used in MicroPDF417; the symbol characters in a given cluster conform with particular structural rules which are used in decoding the symbology 3.5 compaction mo
44、de any of three data compaction algorithms in PDF417 (Text, Numeric and Byte Compaction modes), also used in MicroPDF417, which are used to map 8-bit data bytes efficiently to PDF417 codewords 3.6 e-distance measurement from the leading edge of one element to the leading edge of the next element, or
45、 from the trailing edge of an element to the trailing edge of the next element, in a symbol character or Row Address Pattern 3.7 error correction codeword codeword which encodes a value derived from the error correction codeword algorithm to enable decode errors to be detected and, depending on the
46、number of error correction codewords, to be corrected 3.8 Extended Channel Interpretation ECI procedure within some symbologies, including MicroPDF417, to replace the default interpretation with another interpretation in a reliable manner NOTE The interpretation intended prior to producing the symbo
47、l can be retrieved after decoding the scanned symbol to recreate the data message in its original format. 3.9 extended channel model system for encoding and transmitting both data message bytes and control information about the message, the control information being communicated using Extended Chann
48、el Interpretation (ECI) escape sequences 3.10 family set of MicroPDF417 symbol versions sharing the same number of columns and the same RAP rotation BS ISO/IEC 24728:20063 3.11 function codeword codeword which initiates a particular operation within a symbology, for example to switch between data en
49、coding sets, to invoke a compaction scheme, to program the reader, or to invoke Extended Channel Interpretations 3.12 Global Label Identifier GLI procedure in the PDF417 symbology which behaves in a similar manner to Extended Channel Interpretation NOTE The GLI system was the symbology-dependent precursor to the symbology-independent ECI system. 3.13 macro character character representing a predefined sequence of data characters (e.g. an
