1 Scope
This Standard specifies the methodology for the measurement of print quality of bar code symbols.
This Standard applies to the measurement of print quality of bar code symbols. For the specific application fields have special national standards on bar code symbol inspection, the bar code symbols shall be inspected in accordance with such inspection standards.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 12905 Bar coding terminology
ISO 7724-2:1984 Paints and varnishes — Colorimetry — Part 2: Colour measurement.
3 Terms and Definitions
For the purposes of this Standard, the terms and definitions given in GB/T 12905 and the following apply.
3.1
Bar
A dark element corresponding to a region of a scan reflectance profile (3.16) below the global threshold.
3.2
Bar reflectance
The lowest reflectance value (3.16) of an individual bar element (3.1) in the scan reflectance profile of that element.
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Inspection Conditions
4.1 Environmental conditions
4.2 Measurement apparatus
4.3 Sample
5 Inspection Items
5.1 Quality grades of bar code symbols
5.2 Evaluation parameters of scan reflectance profile
5.3 Additional requirements of symbology standard, application standard or specification on the whole bar code symbol
6 Measurement Methodology
6.1 General requirements
6.2 Scan reflectance profile
6.3 Scan reflectance profile assessment parameters
7 Symbol Grading
7.1 Scan reflectance profile grading
7.2 Determination of symbol grade
7.3 Expression of symbol grade
7.4 Integration of each single evaluation parameter of scan reflectance profile
Appendix A (Informative) Comparison between Chapter and Article Numbers of This Standard and Those of ISO/IEC 15416:2000
Appendix B (Informative) Technical Differences between This Standard and ISO/IEC 15416:2000 and Their Reasons
Appendix C (Informative) Guidance on Selection of Light Wavelength
Appendix D (Informative) Substrate Characteristics
Appendix E (Informative) Guidance on Number of Scans per Symbol
Appendix F (Normative) Decodability
Appendix G (Informative) Process Control Requirements
Appendix H (Informative) Interpretation of the Scan Reflectance Profile and Profile Grades
Appendix I (Normative) Example of Symbol Quality Grading
Appendix J (Informative) Symbol Grading Flowchart
Appendix K (Informative) Example of Verification Report
Appendix L (Informative) Comparison with Traditional Methodologies
