BS IS0/IEC 29158:2025 BSI Standards Publication Automatic identification and data capture techniques Bar code symbol quality test specification Direct part mark (DPM) bsi. BSIS0/IEC 29158:2025 BRITISH STANDARD National foreword This British Standard is the UK implementation of IS0/IEC 29158:2025. It supersedes BS IS0/IEC 29158:2020, which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee IST/6, Data communications. A list of organizations represented on this committee can be obtained on request to its committee manager. Contractual and legal considerations This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BsI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and This publication is provided as is, and is to be used at the recipient's own risk. The recipient is advised to consider seeking professional guidance with respect to its use of this publication. This publication is not intended to constitute a contract. Users are responsible for its correct application. @ The British Standards Institution 2025 Published by BSI Standards Limited 2025 ISBN9780539272871 ICS35.040.50 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2025. Amendments/corrigenda issued since publication Date Text affected BS IS0/IEC 29158:2025 IEC International iso Standard ISO/IEC29158 Automatic identification and data Second edition capture techniques Bar code 2025-03 symbol quality test specification Direct part mark (DPM) Reference number ISO/IEC 29158:2025(en) ?ISO/IEC2025 BSISO/1EC29158:2025 IS0/IEC 29158:2025(en) COPYRIGHTPROTECTEDDOCUMENT @IS0/IEC2025 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 below or Iso's member body inthe country ofthe requester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+41227490111 Email: [email protected] Website: www.iso.org Published in Switzerland @ IS0/IEC 2025 - All rights reserved i BSIS0/IEC 29158:2025 IS0/IEC 29158:2025(en) Contents Page Foreword V Introduction. ..vi 1 Scope. 1 2 Normative references 1 3 Terms and definitions. 1 4 Symbols and abbreviated terms. .2 4.1 Symbols. .2 4.2 Abbreviated terms.. .3 5 Overview of methodology 3 5.1 Process differences from IS0/IEC 15415 .3 5.2 Lighting .3 5.3 Tilted coaxial lighting and camera position 4 6 Obtaining the image. 5 6.1 Camera position and symbol orientation .5 6.1.1 Symbol placement. 6.1.2 Camera position in a 9o° camera angle set up 5 6.1.3 TCL setup .5 6.2 Lightingenvironments. .5 6.2.1 General 5 6.2.2 Perpendicular coaxial ("90") .5 6.2.3 Diffuse off-axis (D") .5 6.2.4 Four direction ("Q") .6 6.2.5 Two direction ("T") .6 6.2.6 One direction ("s") 6 6.2.7 TCL setup 6.3 Image focus.. 6.4 Depth of field. .7 6.5 System response adjustment and reflectance calibration .7 7 Verifying a symbol. > 7.1 Initial image reflectance. 7.1.1 General. 7 7.1.2 Initializing the aperture size. 7 7.1.3 Creating an initial histogram. .7 7.1.4 Computing the mean .7 7.1.5 Optimizing an image. ..8 7.2 Obtaining the test image ..8 7.2.1 Matrix symbologies. .8 7.2.2 Binarizing the image .8 7.3 Applying a reference decode algorithm ..8 7.3.1 General .8 7.3.2 Repeating if necessary 8 7.3.3 Continuing until the end. .8 7.4 Final image adjustment 7.4.1 General. 8 7.4.2 Determining the grid-centre point reflectance with two apertures .9 7.4.3 Creating a grid-centre point histogram. .9 7.4.4 Measuring the mean light .9 7.4.5 Reco