Siemens SIMATIC MV500 - Page 55

Image processing
3.2 Code verification
SIMATIC MV500
Operating Instructions, 03/2021, C79000-G8976-C494-05
55
• Print growth:
Positive or negative size ratio of the printed cells relative to the ideal grid. Is only
calculated as a reference, no quality grade is assigned.
• Reference decode:
Based on a binary image of the code according to ISO/IEC 16022:2006, a code is decoded
using the decoder described in the data matrix standard. If the code can be successfully
decoded, the quality grade "4" is assigned; if not, the quality grade "0".
• Symbol contrast:
Difference between the highest and lowest reflectance of the data matrix surface.
• Unused error correction:
Proportion of error correction information not used for correction of the read result.
Table 3- 3 Assignment of the numeric grade of ISO/IEC 15415 to the quality grades
Quality features
(abbreviation)
Quality grades
Comment
4
3
2
1
0
Axial non-uniformity
(AN_)
≤ 0.06
≤ 0.08
≤ 0.10
≤ 0.12
> 0.12
--
L/F border violation (FPD)
This measurement is made in a three-stage process.
There is no direct correlation between the intermedi-
ate results and the quality grade.
--
Grid non-uniformity (GN_)
≤ 0.38
≤ 0.50
≤ 0.63
≤ 0.75
> 0.75
--
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.
--
Print growth
Reference only, no grading
X and Y
Reference decode (RD_)
pass
--
--
--
Failed
--
Symbol contrast (SC_)
≥ 0.70
≥ 0.55
≥ 0.40
≥ 0.20
< 0.20
--
Unused error correction (UEC)
≥ 0.62
≥ 0.50
≥ 0.37
≥ 0.25
< 0.25
--