Siemens SIMATIC MV500, Operating Instructions Manual, Page: 58 / 294

Image processing
3.2 Code verification
SIMATIC MV500
58
Operating Instructions, 03/2021, C79000-G8976-C494-05
Table 3- 4 Assignment of the numeric grade of ISO/IEC 29158 to the quality grades
Quality features
(abbreviation)
Quality grades Comment
4 3 2 1 0
Axial non-uniformity (AN_) ≤ 6 % ≤ 8 % ≤ 10 % ≤ 12 % >12 % --
Cell contrast (SC_) ≥30 % ≥ 25 % ≥ 20 % ≥ 15 % < 15 % Calculation different from
ISO 15415
Cell modulation (MOD) This measurement is made in a three-stage process.
There is no direct correlation between the intermedi-
ate results and the quality grade.
Calculation different from
ISO 15415
L/F fixed pattern damage (FPD) This measurement is made in a three-stage process.
There is no direct correlation between the intermedi-
ate results and the quality grade.
Calculation different from
ISO 15415
Grid non-uniformity (GN_) ≤ 0,38 ≤ 0,50 ≤ 0,63 ≤ 0,75 > 0,75 --
Minimum reflectance (RMI) ≥ 5 % -- -- -- < 5 % --
Reference decode (RD_) pass -- -- -- fail --
Unused error correction (UEC) ≥ 62 % ≥ 50 % ≥ 37 % ≥ 25 % < 25 % --
Print growth Reference only, no grading --
Note
Deactivation of reference decoding
The ISO/IEC 29158 standard allows for the use of a proprietary decoder instead of a reference
decoder. This means successful verification is also possible for codes that cannot be read by
the reference decoder.
Note that some quality features are calculated based on the reference decoding. If the quality
feature reference decoding is disabled in the user interface, these quality features are
calculated based on the proprietary decoder. As a result, the calculated values can deviate
and it is no longer guaranteed that they match a quality measurement conducted with a
verifier from a different manufacturer.
The affected quality features are:
•
Pressure deviation (not evaluated)
• Unused error correction
• Grid non-uniformity
• Cell modulation