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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1635 : 1998 The Eur
2、opean Standard EN 1635 : 1997 has the status of a British Standard ICS 35.040 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Bar coding Test specifications Bar code symbols Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:38:08 GMT+00:00 2006, Uncontrolled Copy, (c)
3、BSI This British Standard, having been prepared under the direction of the Information Systems Technology Assembly, was published under the authority of the Standards Board and comes into effect on 15 January 1998 BSI 1998 ISBN 0 580 28973 7 BS EN 1635 : 1998 Amendments issued since publication Amd.
4、 No.DateText affected National foreword This British Standard is the English language version of EN 1635 : 1997. The UK participation in its preparation was entrusted to Technical Committee IST/34, Bar coding, which has the responsibility to: aid enquirers to understand the text; present to the resp
5、onsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its
6、secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standard
7、s Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 36, an inside back cover and a back cover. Licensed Copy: sheffieldun she
8、ffieldun, na, Fri Nov 17 08:38:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by
9、 any means reserved worldwide for CEN national Members. Ref. No. EN 1635 : 1997 E EUROPEAN STANDARDEN 1635 NORME EUROPE ENNE EUROPA ISCHE NORM July 1997 ICS 35.040 Descriptors: Data processing, character recognition, optical recognition, bar codes, symbols, tests, conformity tests, specifications, q
10、uality, measurements, classifications English version Bar coding Test specifications Bar code symbols Code a barres Spe cifications dessai de symboles de codes a barres Strichcodierung Testspezifikationen Strichcodesymbole This European Standard was approved by CEN on 1997-06-20. CEN members are bou
11、nd to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the C
12、entral Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status
13、as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffi
14、eldun, na, Fri Nov 17 08:38:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 1635 : 1997 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 225, Bar coding, the secretariat of which is held by NNI. This European Standard shall be given the status of a nat
15、ional standard, either by publication of an identical text or by endorsement, at the latest by January 1998, and conflicting national standards shall be withdrawn at the latest by January 1998. Organizations contributing to the development of the standard include: AIM Europe AIM USA According to the
16、 CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sw
17、eden, Switzerland and the United Kingdom. Contents Page Foreword2 Introduction4 1Scope4 2Normative references4 3Definitions, symbols and abbreviations5 3.1Definitions5 3.2Symbols and abbreviations5 3.2.1 Abbreviations5 3.2.2 Symbols used in formulae6 4Measurement methodology6 4.1General requirements
18、6 4.2Correlation with traditional methodologies6 4.3Reference reflectivity measurements6 4.3.1 Measurement wavelength(s)7 4.3.2 Optical geometry7 4.3.3 Sample area7 4.3.4 Inspection band8 4.3.5 Number of scans9 4.3.6 Process control for repetitive printing9 4.4Scan reflectance profile9 Page 4.5Profi
19、le assessment parameters9 4.5.1 Element determination12 4.5.2 Decode12 4.5.3 Symbol contrast12 4.5.4 Edge contrast12 4.5.5 Modulation12 4.5.6 Defects12 4.5.7 Decodability13 4.5.8 Quiet zone check13 5Symbol grading14 5.1Scan reflectance profile grading14 5.1.1 Decode14 5.1.2 Reflectance parameter gra
20、ding14 5.1.3 Decodability14 5.2Expression of symbol grade15 6Other aspects of the symbol15 6.1Substrate characteristics15 6.2Element widths15 6.2.1 Average element widths15 6.2.2 Process control for EAN/UPC symbols15 6.3Correlation of symbol contrast with other contrast measurements15 7Multi-row sym
21、bologies16 Annexes A(normative) Decodability17 A.1Applicable symbologies17 A.2Code 39 and Interleaved 2 of 517 A.3Codabar17 A.4Code 12818 A.5EAN/UPC19 B(informative) The relationship between bar width deviation and decodability for the EAN/UPC symbology23 B.1The V2 factor23 B.2Bar width deviation an
22、d decodability24 C(informative) Example of symbol quality grading27 C.1Individual scan reflectance profile grading27 C.2Overall symbol grade27 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:38:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 1635 : 1997 BSI 1998 Page D(informative)
23、 Substrate characteristics27 D.1Substrate opacity27 D.2Gloss27 D.3Over-laminate27 E(informative) Interpreting the scan reflectance profile and symbol grades28 E.1Significance of scan reflectance profiles28 E.2Interpretation of results28 E.3Grades for process control28 E.4Matching grades to applicati
24、ons29 E.5Alphabetic grading29 F(informative) Static reflectance measurements30 G(informative) Guidance on selection of measurement wavelength30 G.1Light sources30 G.2Effect of variations in wavelength31 H(informative) Guidance on number of scans per symbol31 J(informative) Example of verification re
25、port32 K(informative) Contrast measurements Comparison of symbol contrast with print contrast signal34 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:38:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 1635 : 1997 BSI 1998 Introduction The technology of bar coding is based on the r
26、ecognition of patterns encoded in bars and spaces of defined dimensions according to rules defining the translation of characters into such patterns, known as the symbology specification. The bar code symbol must be produced in such a way as to be reliably decoded at the point of use, if it is to fu
27、lfil its basic objective as a machine readable data carrier. Manufacturers of bar code equipment and the producers and users of bar code symbols therefore require publicly available standard test specifications for the objective assessment of the quality of bar code symbols, to which they can refer
28、when developing equipment and application standards or determining the quality of the symbols. Such test specifications form the basis for the development of measuring equipment for process control and quality assurance purposes during symbol production as well as afterwards. The performance of meas
29、uring equipment is intended to be the subject of a separate European Standard. This standard is intended to be substantially equivalent in technical content to the corresponding ANSI standard X3.182 1990. The methodology of this standard is complementary to bar code symbol production methods based o
30、n adherence to procedures for the specification of variable attributes of the symbol, rather than direct measurement of symbols. It does not invalidate such techniques, but provides independent confirmation of their suitability for the application in question. Alternative methods of quality assessme
31、nt may be agreed between parties or as part of an application specification. 1 Scope This European Standard specifies the methodology for testing bar code symbols for conformity with the symbology specification; defines a range of quality grades based on the measurement of specific attributes of the
32、 symbol; gives information on possible causes of deviation from optimum grades to enable users to take appropriate corrective action. This European Standard applies to those symbologies for which a European Standard has been drawn up and its methodology can be applied to other symbologies for which
33、a reference decode algorithm has been defined, including both linear and multi-row symbologies. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and
34、the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN
35、797 : 1995Bar Coding Symbology Specifications EAN/UP EN 798 : 1995Bar Coding Symbology Specifications Codabar EN 799 : 1995Bar Coding Symbology Specifications Code 128 EN 800 : 1995Bar Coding Symbology Specifications Code 39 EN 801 : 1995Bar Coding Symbology Specifications Interleaved 2 of 5 prEN 15
36、56Bar Coding Terminology EN ISO 9000-1 : 1994Quality management and quality assurance standards Part 1: Guidelines for selection and use EN ISO 9001 : 1994Quality systems Model for quality assurance in design/ development, production, installation and servicing EN ISO 9002 : 1994Quality systems Mode
37、l for quality assurance in production, installation and servicing ISO 2859-1 : 1989Sampling procedures for inspection by attributes Part 1: Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection ISO 3951 : 1989Sampling procedures and charts for inspection by variables for
38、 percent nonconforming ISO 7724-2 : 1984Paints and varnishes Colorimetry Part 2: Colour measurement Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:38:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 1635 : 1997 BSI 1998 3 Definitions, symbols and abbreviations 3.1 Definitions For t
39、he purposes of this standard the definitions of prEN 1556, together with the following definitions, apply. 3.1.1 bar reflectance (Rb) The lowest reflectance value in the profile of a bar element. 3.1.2 decodability (V) Measure of the proportion of the theoretical tolerance derived from the reference
40、 decode algorithm, for the element (or distance) deviating most from its nominal dimension in a scan profile, not consumed by that element or distance. 3.1.3 decode Determination of the information encoded in a bar code symbol. 3.1.4 edge contrast (EC) The difference between bar reflectance and spac
41、e reflectance of two adjacent elements. 3.1.5 element reflectance non-uniformity (ERN) The reflectance difference between the highest peak and the lowest valley in the profile of an individual element or quiet zone. 3.1.6 global threshold (GT) The reflectance level midway between the maximum and min
42、imum reflectance values in a scan reflectance profile used for the initial identification of elements. 3.1.7 gloss The propensity of a surface to reflect a proportion of incident light in a specular manner. 3.1.8 inspection band The band (usually from 10 % to 90 % of the height of a bar code symbol)
43、 across which measurements are taken (see figure 2). 3.1.9 modulation (MOD) The ratio of minimum edge contrast (ECmin) to symbol contrast (SC). 3.1.10 peak A point of higher reflectance in a profile with points of lower reflectance on either side. 3.1.11 profile Scan reflectance profile (plot of var
44、iations in reflectance with linear distance along a scan path). 3.1.12 sample area The effective area of the symbol within the field of view of the measurement device. 3.1.13 scan path The line along which the centre of the sample area traverses the symbol. 3.1.14 show-through The property of a subs
45、trate that allows underlying markings or materials to affect the reflectance of the substrate. 3.1.15 space reflectance (Rs) The highest reflectance value in the profile of a space element. 3.1.16 symbol contrast (SC) The difference between the maximum and minimum reflectance values in a scan reflec
46、tance profile. 3.1.17 valley A point of lower reflectance in a profile with points of higher reflectance on either side. 3.1.18 vertical redundancy The property of a bar code symbol whereby there exist multiple possible scan paths as a result of the symbol being significantly higher than the height
47、of a single scan line. 3.2 Symbols and abbreviations 3.2.1 Abbreviations 3.2.1.1 EC: Edge contrast. 3.2.1.2 ECmin: Minimum value of EC. 3.2.1.3 ERN: Element reflectance non-uniformity. 3.2.1.4 ERNmax: Maximum value of ERN. 3.2.1.5 GT: Global threshold. 3.2.1.6 MOD: Modulation. 3.2.1.7 N: Achieved wi
48、de to narrow ratio. 3.2.1.8 PCS: Print contrast signal. 3.2.1.9 Rb: Bar reflectance. 3.2.1.10 RD: Bar (dark) reflectance. 3.2.1.11 RL: Background (light) reflectance. 3.2.1.12 Rmax: Maximum reflectance. 3.2.1.13 Rmin: Minimum reflectance. 3.2.1.14 Rs: Space reflectance. 3.2.1.15 RT: Reference thresh
49、old. 3.2.1.16 S: Total width of a character. 3.2.1.17 SC: Symbol contrast. 3.2.1.18 SRD: Static reflectance difference. 3.2.1.19 V: Decodability value. 3.2.1.20 Z: Average achieved narrow element dimension. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:38:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 6 EN 1635 : 1997 BSI 1998 3.2.2 Symbols used in formulae 3.2.2.1 A: Average achieved width of element or element combinations of a particular type. 3
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