
MATRIX 400™ CODE QUALITY VERIFIER SOLUTION
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2.5 ISO/IEC 15416 1D STANDARD
The ISO-IEC 15416 Standard specifies the methodologies for the measurement of specific
attributes of linear bar code symbols, and methods for evaluating and grading these
measurements and deriving an overall assessment of symbol quality.
Bar code symbol quality assessment shall be based on an analysis of the Scan Reflectance
profiles. The scan reflectance profile is a record of the Reflectance values measured on a
single line across the entire width of the barcode
Symbol Quality grading shall be used to derive a relative measure of symbol quality under
the measurement conditions used. Each scan reflectance profile shall be analyzed and a
grade on a descending scale of integers from 4 to 0 shall be allocated to each of the
parameters evaluated
Scan Reflectance Profile Grades:
The Scan Reflectance Profile Grade shall be the lowest grade of the following:
- Decode
- Symbol Contrast (SC)
- Minimum Reflectance (Rmin)
- Minimum Edge Contrast (ECmin)
- Modulation (MOD)
- Defects
- Decodability (V)
Overall Symbol Grade:
The (Overall) Symbol Grade is only meaningful if it is expressed in conjunction with the
measurement wavelength and aperture used. It should be shown in the format:
Grade / Aperture / Wavelength
Where:
•
“Grade” is the overall symbol grade (i.e. the the arithmetic mean of the individual Scan
Reflectance Profile Grades calculated on the requested number of scans to one decimal
place).
•
“Aperture” is the aperture reference number (from Standard’s table) or the diameter in
thousandths of an inch (to the nearest thousandth) of the synthetised aperture.
•
“Wavelength” is the peak light wavelength in nanometres.
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