Image processing
4.2 Code verification
SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
61
● Defects:
Irregularities in elements and quiet zones measured based on the non-uniformity of the
reflectance of the elements.
● Modulation:
Ratio of the minimum edge contrast to the symbol contrast.
● Start quiet zone:
Area outside the start codeword with a length of 10 modules.
● Stop quiet zone:
Area outside the stop codeword with a length of 10 modules.
Assignment of the numeric grade of ISO/IEC 15416 to the quality levels
Grade 4 3 2 1 0 Comment
Scan reflectance profile Lowest single grade per scan line
Edge determination pass fail
Reference decode pass fail
Minimum edge contrast
(MEC)
≥0.15 <0.15
Minimum reflectance (RMI) ≤0.5R
max
>0.5R
max
R
max
is the maximum
reflectance.
Symbol contrast (SC_) ≥0.70 ≥0.55 ≥0.40 ≥0.20 <0.20
Decodability (DEC) ≥0.62 ≥0.50 ≥0.38 ≥0.25 <0.25
Defects (DEF) ≤0.15 ≤0.20 ≤0.25 ≤0.30 >0.30
Modulation (MOD) ≥0.70 ≥0.60 ≥0.50 ≥0.40 <0.40
Quiet zone (QZ_) ≥10
modules
< 10
modules
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