ISO/IEC 20830:2021

INTERNATIONAL ISO/IEC
STANDARD 20830
First edition
2021-08
Information technology — Automatic
identification and data capture
techniques — Han Xin Code bar code
symbology specification
Technologies de l'information — Techniques d'identification et de
capture de données automatiques — Spécification des symboles du
code à barres de Han Xin
Reference number
ISO/IEC 20830:2021(E)
©
ISO/IEC 2021

---------------------- Page: 1 ----------------------
ISO/IEC 20830:2021(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2021 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/IEC 20830:2021(E)

Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, and symbols . 1
3.1 Terms and definitions . 1
3.2 Mathematical and logical symbols . 3
4 Symbology description. 4
4.1 Symbology characteristics . 4
4.1.1 Basic characteristics . 4
4.1.2 Summary of additional features . 5
4.2 Symbol structure . 5
4.2.1 General. 5
4.2.2 Symbol Versions and Sizes . 6
4.2.3 Finder Pattern . 8
4.2.4 Position Detection Pattern separator.10
4.2.5 Alignment Pattern . . .10
4.2.6 Assistant Alignment Pattern .13
4.2.7 Structural Information Region .13
4.2.8 Data Region.14
4.2.9 Quiet Zone.14
5 Requirements .15
5.1 Encode procedure overview.15
5.2 Data analysis .16
5.3 Mode .17
5.3.1 General.17
5.3.2 Numeric mode . .19
5.3.3 Text mode .19
5.3.4 Binary byte mode .19
5.3.5 Common Chinese Characters in Region One mode .19
5.3.6 Common Chinese Characters in Region Two mode .20
5.3.7 GB18030 2-byte Region mode .20
5.3.8 GB18030 4-byte Region mode .20
5.3.9 Extended Channel Interpretation (ECI) mode .20
5.3.10 Unicode mode .20
5.3.11 GS1 mode .20
5.3.12 URI mode .21
5.4 Data encoding .21
5.4.1 General.21
5.4.2 Constructing the information bit stream .21
5.4.3 Constructing information codewords sequence .21
5.4.4 Numeric mode encoding .21
5.4.5 Text mode encoding .23
5.4.6 Binary mode encoding .24
5.4.7 Common Chinese Characters in Region One mode encoding .25
5.4.8 Common Chinese Characters in Region Two mode encoding.26
5.4.9 GB18030 2-byte Region mode encoding .27
5.4.10 GB18030 4-byte Region mode encoding .28
5.4.11 ECI mode encoding .29
5.4.12 Unicode mode .30
5.4.13 GS1 mode encoding .33
5.4.14 URI mode .36
© ISO/IEC 2021 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO/IEC 20830:2021(E)

5.4.15 Mixed modes encoding .41
5.5 Error detection and correction .42
5.5.1 General.42
5.5.2 Generating the error correction codewords .42
5.5.3 Error correction capacity .44
5.6 User considerations for encoding data in a Han Xin Code symbol .44
5.6.1 General.44
5.6.2 User selection of error correction level.44
5.6.3 User selection of mode .44
5.6.4 User selection of Extended Channel Interpretation .45
5.6.5 User selection of symbol size .45
5.7 Construction of final data bit stream .45
5.8 Symbol construction .45
5.8.1 General.45
5.8.2 Fixed Pattern placement .45
5.8.3 Data placement.46
5.8.4 Masking .48
5.8.5 Structural Information placement .49
6 Symbol dimensions .50
6.1 Dimensions .50
6.2 Quiet zone.50
7 User guidelines .50
7.1 Human readable interpretation .50
7.2 Autodiscrimination capability .51
7.3 Principle of Han Xin Code symbol printing and scanning .51
8 Symbol quality .51
8.1 General .51
8.2 Symbol quality parameters .51
8.2.1 General.51
8.2.2 Fixed Pattern damage .51
8.2.3 Symbol grade .51
8.2.4 Grid non-uniformity .51
8.3 Process control measurements.51
9 Decoding procedure overview .52
10 Reference decode algorithm for Han Xin Code .53
10.1 General .53
10.2 Image preprocessing .53
10.3 Locate Finder Pattern and determine the orientation .53
10.4 Structural Information decoding .55
10.5 Establish the sampling grid .56
10.6 Sampling .63
10.7 Masking releasing .63
10.8 Restore data codewords.64
10.9 Error correction decoding .64
10.10 Data codeword decoding .64
11 Transmitted data .64
11.1 General .64
11.2 Basic interpretation .64
11.3 Protocol for Extended Channel Interpretation .64
11.4 Protocol for GS1 data transmission.65
Annex A (normative) Alignment Pattern parameters of symbol of different versions .66
Annex B (normative) Data capacity and error correction characterics of Han Xin Code .69
Annex C (informative) Information capacity of Han Xin Code .84
iv © ISO/IEC 2021 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/IEC 20830:2021(E)

Annex D (normative) Error correction codeword generator polynomials .93
Annex E (normative) Structural Information .95
Annex F (informative) Autodiscrimination compatibility.98
Annex G (informative) Error correction decoding algorithm .99
Annex H (informative) User guidance for Han Xin Code printing and scanning .101
Annex I (normative) Print quality of Han Xin Code — Symbology-specific aspects .103
Annex J (informative) Useful process control techniques .107
Annex K (informative) Han Xin Code encoding examples .108
Annex L (informative) Symbology identifier .129
Annex M (normative) Charsets of URI mode .130
Annex N (normative) Source codes for Unicode modein C programming .137
Annex O (informative) Implement Source code for URI modein C programming .161
Bibliography .196
© ISO/IEC 2021 – All rights reserved v

---------------------- Page: 5 ----------------------
ISO/IEC 20830:2021(E)

Foreword
ISO (the International Organization for Standardization) and IEC (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 particular 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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for
the different types of document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives or www .iec .ch/ members
_experts/ refdocs).
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
rights. Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents) or the IEC
list of patent declarations received (see patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html. In the IEC, see www .iec .ch/ understanding -standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 31, Automatic identification and data capture techniques.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html and www .iec .ch/ national
-committees.
vi © ISO/IEC 2021 – All rights reserved

---------------------- Page: 6 ----------------------
ISO/IEC 20830:2021(E)

Introduction
Han Xin Code is a two-dimensional matrix symbology which is made up of an array of nominally square
modules arranged in an overall square pattern, including a Finder Pattern located at four corners of
the symbol that are intended to assist in easy locating of its position, size and inclination. Alignment
Patterns and Assistant Alignment Patterns are also used in Versions 4 to 84 symbols. A wide range
of size of symbols is provided together with four error correction levels. Module dimension is user-
specified to produce symbols by a wide variety of techniques.
Manufacturers of bar code equipment and users of the technology require publicly available standard
symbology specifications to which they can refer when developing equipment and application
standards. This document is published to meet this request.
© ISO/IEC 2021 – All rights reserved vii

---------------------- Page: 7 ----------------------
INTERNATIONAL STANDARD ISO/IEC 20830:2021(E)
Information technology — Automatic identification
and data capture techniques — Han Xin Code bar code
symbology specification
1 Scope
This document defines the requirements for the symbology known as Han Xin Code. It specifies the
Han Xin Code symbology characteristics, data encoding process, symbol structure, dimensions and
print quality requirements, error correction rules, reference decoding algorithm, and user-selectable
application parameters.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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, Information technology — ISO 7-bit coded character set for information interchange
ISO/IEC 15415:2011, Information technology — Automatic identification and data capture techniques —
Bar code symbol print quality test specification — Two-dimensional symbols
ISO/IEC 15416, Automatic identification and data capture techniques — Bar code print quality test
specification — Linear symbols
ISO/IEC 15424, Information technology — Automatic identification and data capture techniques — Data
Carrier Identifiers (including Symbology Identifiers)
ISO/IEC 19762, Information technology — Automatic identification and data capture (AIDC) techniques —
Harmonized vocabulary
GS1 General Specifications
3 Terms, definitions, and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 19762 and the following
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1.1
assistant alignment pattern
non-data pattern located in the perimeter of the Han Xin Code symbol and intended to provide
additional reference points to synchronize modules for reading
© ISO/IEC 2021 – All rights reserved 1

---------------------- Page: 8 ----------------------
ISO/IEC 20830:2021(E)

3.1.2
data bit stream
binary sequence that comprises the information bit stream (3.1.9) and the error correction bit stream
(3.1.4)
3.1.3
data codeword
codeword that is used to encode information codewords and error correction codewords.
3.1.4
error correction bit stream
binary sequence used to correct errors, made by error correction encoding from the information bit
stream (3.1.9)
3.1.5
Unicode
international encoding standard for use with different languages and scripts, by which each letter, digit,
or symbol applies across different platforms and programs.
Note 1 to entry: The repertoire of Unicode is synchronized with ISO/IEC 10646, and both are code-for-code
identical.
3.1.6
GS1 mode
encoding mode (3.1.10) used for representing GS1 data in Han Xin Code
3.1.7
URI mode
encoding mode (3.1.11) used for representing uniform resource identifier (URI) described in RFC 3986
in Han Xin Code
3.1.8
Unicode mode
encoding mode (3.1.11) used for representing text data in Unicode (3.1.5) encoding/charset in Han Xin
Code.
3.1.9
information bit stream
binary sequence made up of mode (3.1.11) encodings from the original input data
3.1.10
masking
XOR processing of the bit pattern in the information encoding region of the symbol with an
algorithmically determined pattern to provide a symbol with more evenly balanced numbers of dark
and light modules and to reduce the occurrence of patterns which would interfere with fast processing
of the image
3.1.11
mode
method of representing a specific character set as a binary bit stream
3.1.12
mode indicator
bit sequence indicating in which mode (3.1.11) the following data sequence is encoded
3.1.13
mode terminator
bit sequence used to terminate the bit sequence represent
...