Balluff BVS ID-M1280 F1 Series, Configuration Manual

Page: 193 / 316

BVS ID-M1280xF1-xx-xxx
english 35
Code quality
The code quality is determined for 1D code types borrowing from ISO/IEC 15416. For 2D code types, quality
assessment borrowing from ISO/IEC 15415 or borrowing from ISO/IEC TR 29158 can be chosen by
Asses
quality . For PDF417 only ISO/IEC 15415 is supported. Please note, that the norms contain instructions for the
measurement setup and the measurement procedure. The computed values are, in terms of the norms, only
valid if these conditions are fulfilled.
The standards define several quality characteristics, whereby the total quality is given by the worst of all
characteristics. To assess the quality, symbol grades according to the Anglo-American system are used (A, B,
C, D, E, F). As a result, A represents the highest possible quality, whereas F means that the minimum
requirement has not been satisfied:
Structure of the quality result string of 1D code types borrowing from ISO/IEC 15416
The string with the format a (bcdefghi ) indicates the determined quality which has the following meaning:
Index Characteristic Description
a Overall quality The minimum or worst quality of all characteristics.
b Decode
Will indicate, if the code can be read or not according to the specification; for
this reason, the value can only be A (readable after specification) or F (not
readable after specification). Even with the grade F, the code can be readable
for the system.
c Symbol contrast
To conform the contrast requirements of the gray value profile. Describes the
difference between the highest and the lowest reflectance values of the gray
value profile.
d
Minimal
reflectance
Will indicate, if the minimum reflectance value is smaller or equal to the half of
the maximum reflectance value. Is this the case, the quality is "A", otherwise
"F".
e
Minimal edge
contrast
Evaluates the minimal edge contrast of two neighbor symbol elements.
f Modulation
The measure of the amplitude between two symbol elements specifies how
reliable bars and gaps can be distinguished.
g Defects
Indicates, to what extent irregularities or disturbances occur in quiet zone within
the gray value profile.
h Decodability
Describes, how far the true width of the symbol elements differs from the
standard of the barcode types.
i
Additional
requirements
Depending on the code type, the ISO/IEC 15416 defines additional
requirements like the quiet zone widths, the wide/narrow ratio, the inter
character gaps.