Appendix: Quality Characteristics For Barcodes And Matrix Codes - Baumer VeriSens ID Series Technical Documentation Manual

12.4.7 Appendix: Quality characteristics for barcodes and matrix codes

Numerous quality characteristics are defined for the various code types, these characteristics are described
in more detail in the following. Keep in mind that illumination arrangements and quality requirements are
defined on the image for these standards so that the values determined cannot be directly mapped to your
installation situation!
Barcode quality characteristics (ISO/IEC 15416)
Designation
Legibility
Symbol contrast
Minimum reflection
Edge contrast
Modulation
Defects
Decodability
Additional code-specific
parameters
Determining the quality of barcode
The barcode is scanned internally by multiple detection beams (1) and assessed by the above-named quality
features. An average of the respectively matching quality features over all detection beams is determined
and output (2).
The respectively poorest assessments (3) for a quality feature are also determined per detection beam, their
average is formed and then output as overall quality (4).
NOTE
The overall quality of a barcode can in certain circumstances be poorer than all of the
individual quality features. This is because in each case it is the poorest individual values
(3) that flow into the overall assessment. The overall assessment is not formed from
evaluations of the quality features (2).
If various individual values are conspicuously poor in different detection beams, this can
result in poor overall quality without the individual quality features being assessed as
v2.11.0-B4
Description
A = Code legible
F = Code not read
Difference between the maximum and minimum grey scale value of
the symbols
A = Minimum grey scale value ≤ 0.5 * maximum grey scale value
F = Other
Minimum contrast between two symbol elements
Amplitude between symbol elements
Irregularities in the grey scale profile of a symbol
Deviations in the width of symbol elements
Depending on code type, for example, evaluation of the width of the
quiet zones or ratio of symbol widths.
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Technical Documentation
VeriSens
Baumer Optronic GmbH
Radeberg, Germany
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