INCITS/ISO/IEC 18050 : 2008(R 2018)

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Requirements
6 Basic measurement methodology
7 Verification requirements for Digital Postage Marks
   7.1 Verification equipment
   7.2 Optical geometry
   7.3 Light source
   7.4 Measuring aperture
        7.4.1 Measuring aperture for two-dimensional
               multi-row symbologies
        7.4.2 Measuring aperture for two-dimensional
               matrix symbologies
   7.5 Mail format
8 Grading implications for individual symbol attributes
9 Additional grading parameters - quiet zone
10 Qualification of printing systems for Digital Postage
   Marks
Annex A (normative) Test procedure for printing systems
                    for Digital Postage Marks
   A.1 Environmental conditions for test
   A.2 Test materials
   A.3 Test procedure
Annex B (informative) Light sources and spectral response
                      characteristics for verification of
                      Digital Postage Marks
   B.1 Narrow-band illumination
   B.2 Broad-band illumination (white light)
        B.2.1 Halogen lamps
        B.2.2 Light emitting diode
        B.2.3 Gas discharge lamp
        B.2.4 Fluorescent lamps
Annex C (informative) Symbol parameters measured in
                      accordance with ISO/IEC 15415
   C.1 Parameters for two-dimensional multi-row symbols
   C.2 Parameters for two-dimensional matrix symbologies
Annex D (informative) Characteristics of Digital Postage
                      Mark printing and reading environments
                      that affect print quality
   D.1 Printing of Digital Postage Marks
        D.1.1 Ink-jet printing
        D.1.2 Laser printing
        D.1.3 Thermal transfer printing
        D.1.4 Direct thermal printing
        D.1.5 Matching X dimension to printer resolution
   D.2 Reading environment
Annex E (informative) Possible causes of low parameter
                      grades in the Digital Postage Mark
                      environment
   E.1 Multi-row symbologies
        E.1.1 Symbol Contrast
        E.1.2 Minimum reflectance
        E.1.3 Minimum edge contrast
        E.1.4 Modulation
        E.1.5 Decode
        E.1.6 Defects
        E.1.7 Decodability
        E.1.8 Codeword yield
        E.1.9 Unused error correction (UEC)
        E.1.10 Quiet zone
        E.1.11 Print growth
        E.1.12 Codeword quality
   E.2 Matrix symbologies
        E.2.1 Symbol Contrast
        E.2.2 Fixed pattern damage
        E.2.3 Modulation
        E.2.4 Axial non-uniformity
        E.2.5 Grid non-uniformity
        E.2.6 Unused error correction
        E.2.7 Quiet zone
        E.2.8 Print growth
Bibliography

Describes a methodology for the measurement of defined print quality attributes of Digital Postage Marks in the form of two-dimensional bar code symbols on mail-pieces. Specifies methods for grading the results of these measurements and deriving an overall symbol quality grade as a guide to estimating the readability of the Digital Postage Marks.