Siemens SIMATIC MV500, Руководство по эксплуатации, Страница: 54 / 294

Image processing
3.2 Code verification
SIMATIC MV500
54
Operating Instructions, 03/2021, C79000-G8976-C494-05
Quality features
• Axial non-uniformity:
Difference between the height and width relative to the rows and columns.
• Print growth:
Positive or negative size ratio of the printed cells relative to the ideal grid.
• Contrast:
Difference between the average reflectance of the lightest pixels and the darkest pixels.
• Unused error correction:
Proportion of error correction information not used for correction of the read result.
Table 3- 2 Assignment of the numeric grade of ISO/IEC 16022 to the quality grades
Quality features
(abbreviation)
Quality grades Comment
4 3 2 1 0
Axial non-uniformity (AN_) ≤ 6 % ≤ 8 % ≤ 10 % ≤ 12 % > 12 % --
Print growth (PG_) ≤ 15 % ≤ 21 % ≤ 26 % ≤ 30 % > 30 % Absolute value for x and y
Contrast (SC_) ≥ 70 % ≥ 55 % ≥ 40 % ≥ 20 % < 20 % --
Unused error correction (UEC) ≥ 62 % ≥ 50 % ≥ 37 % ≥ 25 % < 25 % --
3.2.5.2 ISO/IEC 15415
This standard is a specification for testing the print quality of barcodes for two-dimensional
symbols.
The ISO/IEC 16022:2006 document relates to this standard in the guidelines for print quality.
The functions described in the ISO/IEC 15415 standard "5 Scan Average" and "Extended
Reflectance Check" are not supported by the verifiers of the SIMATIC MV540 series.
Quality features
• Axial non-uniformity:
Difference between the height and width relative to the rows and columns.
• L/F border violation:
Measure of the errors in the borders of the data matrix and all errors in the quiet zone
around the code necessary for decoding.
• Grid non-uniformity:
This is the deviation of the measured grid relative to the ideal grid starting from the four
corners of a data matrix.
• Modulation:
Measurement of the uniformity of the reflectance of the dark and light cells of the data
matrix.