Information technology -- Automatic identification and data capture techniques -- Bar code verifier conformance specification

ISO/IEC 15426-2:2015 defines test methods and minimum accuracy criteria applicable to verifiers using the methodologies of ISO/IEC 15415 for multi-row bar code symbols and two-dimensional matrix symbologies, and specifies reference calibration standards against which these should be tested. It provides for testing of representative samples of the equipment. NOTE ISO/IEC 15426‑1 applies to verifiers for linear bar code symbols.

Technologies de l'information -- Techniques automatiques d'identification et de capture des données -- Spécifications de conformité des vérificateurs de codes à barres

General Information

Status
Published
Publication Date
09-Aug-2015
Current Stage
9020 - International Standard under periodical review
Start Date
15-Jul-2020
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ISO/IEC 15426-2:2015 - Information technology -- Automatic identification and data capture techniques -- Bar code verifier conformance specification
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INTERNATIONAL ISO/IEC
STANDARD 15426-2
Second edition
2015-08-01
Information technology — Automatic
identification and data capture
techniques — Bar code verifier
conformance specification —
Part 2:
Two-dimensional symbols
Technologies de l’information — Techniques automatiques
d’identification et de capture des données — Spécifications de
conformité des vérificateurs de codes à barres —
Partie 2: Symboles bidimensionnels
Reference number
ISO/IEC 15426-2:2015(E)
ISO/IEC 2015
---------------------- Page: 1 ----------------------
ISO/IEC 15426-2:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2015, Published in Switzerland

All rights reserved. Unless otherwise specified, 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.
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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO/IEC 2015 – All rights reserved
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ISO/IEC 15426-2:2015(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Conformance ............................................................................................................................................................................................................. 1

3 Normative references ...................................................................................................................................................................................... 1

4 Terms and definitions ..................................................................................................................................................................................... 2

5 Symbols .......................................................................................................................................................................................................................... 2

6 Functional requirements ............................................................................................................................................................................. 2

6.1 General requirements ....................................................................................................................................................................... 2

6.2 Reflectance calibration ..................................................................................................................................................................... 2

6.3 Mandatory functions .......................................................................................................................................................................... 3

6.3.1 Verifiers for multi-row bar code symbols .................................................................................................. 3

6.3.2 Verifiers for two-dimensional matrix symbols ...................................................................................... 3

6.4 Optional functions ................................................................................................................................................................................ 3

7 General constructional and operational requirements ............................................................................................... 4

7.1 Installation, operation and maintenance ......................................................................................................................... 4

7.2 Power supply ............................................................................................................................................................................................ 4

7.3 Temperature .............................................................................................................................................................................................. 4

7.3.1 Operating temperature range ............................................................................................................................... 4

7.3.2 Storage temperature range ..................................................................................................................................... 4

7.4 Humidity ....................................................................................................................................................................................................... 4

7.5 Ambient light immunity .................................................................................................................................................................. 4

8 Test requirements ............................................................................................................................................................................................... 4

8.1 Test methods ............................................................................................................................................................................................. 4

8.1.1 Selection of equipment for testing ................................................................................................................... 5

8.1.2 Scanning parameters.................................................................................................................................................... 5

8.1.3 Test measurements ........................................................................................................................................................ 5

8.2 Test environment .................................................................................................................................................................................. 5

8.3 Primary reference test symbols ............................................................................................................................................... 5

8.4 Test report ................................................................................................................................................................................................... 6

9 Certification and labelling .......................................................................................................................................................................... 6

10 Equipment specification ............................................................................................................................................................................... 6

Annex A (normative) Primary reference test symbols ...................................................................................................................... 8

Annex B (normative) Verification requirements for primary reference test symbols ..................................13

Bibliography .............................................................................................................................................................................................................................14

© ISO/IEC 2015 – All rights reserved iii
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ISO/IEC 15426-2:2015(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

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 ISO documents 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).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO 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).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/IEC JTC 1, Information technology, Subcommittee

SC 31, Automatic identification and data capture techniques.

This second edition cancels and replaces the first edition (ISO/IEC 15426-2:2005), which has been

technically revised. It also incorporates the Technical Corrigendum ISO/IEC 15426-2:2005/Cor1:2008.

ISO/IEC 15426 consists of the following parts, under the general title Information technology —

Automatic identification and data capture techniques — Bar code verifier conformance specification:

— Part 1: Linear symbols
— Part 2: Two-dimensional symbols
iv © ISO/IEC 2015 – All rights reserved
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ISO/IEC 15426-2:2015(E)
Introduction

The technology of bar coding is based on the recognition of patterns encoded, in bars and spaces or in a

matrix of modules of defined dimensions, according to rules defining the translation of characters into

such patterns, known as the symbology specification. Symbology specifications may be categorised

into linear symbols, on the one hand, and two-dimensional symbols on the other; the latter may in turn

be sub-divided into «multi-row bar codes» sometimes referred to as “stacked bar codes”, and “two-

dimensional matrix codes”.

Multi-row bar codes are constructed graphically as a series of rows of symbol characters,

representing data and overhead components, placed in a defined vertical arrangement to form a

(normally) rectangular symbol, which contains a single data message. Each row of the symbol has the

characteristics of a linear bar code symbol and may be read by linear symbol scanning techniques.

Two-dimensional matrix symbols are usually rectangular arrangements of modules placed at the

intersections of a grid of two (sometimes more) axes; the coordinates of each module need to be known

in order to determine its significance, and the symbol must therefore be analysed two-dimensionally

before it can be decoded.

Unless the context requires otherwise, the term “symbol” in this International Standard may refer to

either type of symbology.

The symbol, as a machine-readable data carrier, must be produced in such a way as to be reliably decoded

at the point of use, if it is to fulfil its basic objective. Standard methodologies have been developed for

measuring and assessing the quality of symbols for process control and quality assurance purposes

during symbol production as well as afterwards.

Manufacturers of bar code equipment, the producers of bar code symbols and the users of bar code

technology require publicly available standard conformance specifications for measuring equipment

applying these methodologies, to ensure the accuracy and consistency of performance of this equipment.

This International Standard is intended to be similar in technical content (mutatis mutandis) to

ISO/IEC 15426-1 (the linear bar code verifier conformance standard), on which it has been based. It is

intended to be read in conjunction with the symbology specification applicable to the bar code symbol

being tested, which provides symbology-specific detail necessary for its application.

© ISO/IEC 2015 – All rights reserved v
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INTERNATIONAL STANDARD ISO/IEC 15426-2:2015(E)
Information technology — Automatic identification and
data capture techniques — Bar code verifier conformance
specification —
Part 2:
Two-dimensional symbols
1 Scope

This part of ISO/IEC 15426 defines test methods and minimum accuracy criteria applicable to verifiers

using the methodologies of ISO/IEC 15415 for multi-row bar code symbols and two-dimensional matrix

symbologies, and specifies reference calibration standards against which these should be tested. This

part of ISO/IEC 15426 provides for testing of representative samples of the equipment.

NOTE ISO/IEC 15426-1 applies to verifiers for linear bar code symbols.
2 Conformance

The instrument shall be considered to conform with this part of ISO/IEC 15426 if it performs the

functions defined in 6.3 and if the results of measurements of primary reference test symbols carried

out in accordance with Clause 8 demonstrate that the arithmetic means of the 10 measurements (for

multi-row bar code symbols) or five measurements (for two-dimensional matrix symbols) of individual

reported parameters are within the tolerances shown in Table 1 below.
Table 1 — Tolerances for measured parameter values
Parameter Symbology type Tolerance
R and/or R Both ±5 % reflectance
max s
R and/or R Both ±3 % reflectance
min b
UEC Both ±0,0
Decodability Multi-row ±0,08
Defects Multi-row ±0,08
Codeword Yield Multi-row ±0,08
Grid Nonuniformity Matrix ±0,06
Axial Nonuniformity Matrix ±0,02
Contrast Uniformity (Mod- ±0,08 of the MOD value
Matrix
ulation) described in A.3.2
Within calibrated grade
Fixed Pattern Damage Matrix
boundaries

NOTE The tolerances in Table 1 are additional to any tolerances stated by the supplier of the primary

reference test symbols.
3 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

© ISO/IEC 2015 – All rights reserved 1
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ISO/IEC 15426-2:2015(E)

ISO/IEC 15415, Information technology — Automatic identification and data capture techniques — Bar

code symbol print quality test specification — Two-dimensional symbols

ISO/IEC 15416, Information technology — Automatic identification and data capture techniques — Bar

code symbol quality test specifications — Linear symbols

ISO/IEC 19762-1, Information technology — Automatic identification and data 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)
4 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO/IEC 15415, ISO/IEC 19762-1,

ISO/IEC 19762-2 and the following apply.
4.1
primary reference test symbol

bar code symbol intended for the testing of the accuracy of bar code verifiers and manufactured to close

tolerances, of at least ten times the precision listed in Table 1, by methods traceable to national standards

5 Symbols
R Bar Reflectance, as defined in ISO/IEC 15416
R Maximum reflectance, as defined in ISO/IEC 15416
max
R Minimum reflectance, as defined in ISO/IEC 15416
min
R Space Reflectance, as defined in ISO/IEC 15416
6 Functional requirements
6.1 General requirements

The general requirement of a two-dimensional symbol verifier is that it shall provide assessments of the

quality of a bar code symbol which are accurate and consistent, both in relation to measurements of a

specific symbol made with the same instrument over a period of time and in relation to measurements of a

specific symbol made by different instruments. Such consistency is essential to enable valid comparisons

to be made of assessments of a symbol verified at two different times or on two different instruments.

6.2 Reflectance calibration

Verifiers shall have means of calibration and adjustment where necessary of reflectance values against

reference reflectance calibration samples. Two calibration points should be used, one as near the high

reflectance end of the range and the other as near the low reflectance end of the range as possible.

ISO/IEC 15415 defines the reference reflectance material against which these samples shall be calibrated.

2 © ISO/IEC 2015 – All rights reserved
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ISO/IEC 15426-2:2015(E)
6.3 Mandatory functions
6.3.1 Verifiers for multi-row bar code symbols

A verifier for multi-row bar code symbols applying the methodology defined in ISO/IEC 15415 shall

be capable of:

— collecting reflectance measurements from points along multiple scan paths across a bar code symbol;

— establishing scan reflectance profiles from these measurements;
— analysing the scan reflectance profiles;

— reporting individual scan reflectance profile parameter grades and profile grades;

— reporting the Codeword Yield value and grade;
— reporting the Unused Error Correction value and grade;
— determining and reporting an overall symbol grade;
— reporting the decoded data.
6.3.2 Verifiers for two-dimensional matrix symbols

A verifier for two-dimensional matrix symbols applying the methodology defined in ISO/IEC 15415

shall be capable of:

— collecting reflectance measurements from a sample area framing the test symbol and its quiet

zones, extending for certain symbol sizes 20X beyond the quiet zones (see Clause 10);

— establishing a reference grey-scale image and a binarised image as described in ISO/IEC 15415;

— decoding these images in accordance with the applicable reference decode algorithm;

— reporting individual values and grades for each of the parameters listed in ISO/IEC 15415;

— determining and reporting an overall symbol grade;

— appending an asterisk to the reported overall symbol grade, for certain symbol sizes, under the

additional reflectance check provisions of ISO/IEC 15415;
— reporting the decoded data.

The method of reporting is not specified but may be by means of, for example, a display screen in the

instrument, a printed report, or electronic communication with another device such as a computer.

6.4 Optional functions

Users of verifiers have differing requirements for the amount of detail reported by the instrument, and

a verifier may therefore perform additional functions, for example:

— reporting of number of scan reflectance profiles or images on which the overall symbol grade is based;

— reporting of print growth in one or both axes;
— reporting of symbology verified;
— reporting all decoded symbol characters or codewords;

— print-out or display of all or, at the user’s option, selected scan reflectance profiles or images.

© ISO/IEC 2015 – All rights reserved 3
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ISO/IEC 15426-2:2015(E)
7 General constructional and operational requirements
7.1 Installation, operation and maintenance

The manufacturer shall specify in documentation provided for or available to the installer, user

and maintainer of the equipment the conditions for installation, operation and maintenance of the

equipment. These documents shall indicate the recommended extent and frequency of maintenance,

if any. When equipment which is the subject of this part of ISO/IEC 15426 is installed, operated and

maintained in accordance with the above conditions, it shall be capable of operating as specified.

7.2 Power supply

The manufacturer shall indicate the minimum and maximum parameters of the power supply at which

the device is able to operate according to its specifications. The accuracy of the bar code verifier shall

not be adversely affected by fluctuations in supply voltage and frequency within th

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