Quadrus Verifier User’s Manual
3-5
Verification
ISO/IEC 15415 Evaluation Parameters
Symbol Contrast
Fixed Pattern Damage
Axial Non-Uniformity
Grid Non-Uniformity
Symbol Contrast
is the value difference between light and dark symbol
elements, and between the quiet zone and perimeter elements.
This example shows a low-contrast symbol. The light and dark elements
are too close in value, which undermines readability.
Fixed Pattern Damage
refers to finder pattern and clock pattern
damage.
Notice the missing elements in the clock pattern and the damaged
L-pattern in the example symbol.
Axial Non-Uniformity
is the amount of deviation along the symbol’s major axes.
In this example, the symbol’s Y-axis dimension is clearly greater than its X-axis
dimension.
Y
X
The reference
decode algorithm
plots the symbol’s
grid intersections
and compares
them to an ideal grid.
The largest vector deviation on the grid
determines the Grid Non-Uniformity grade.
Grid Non-Uniformity
refers to a symbol’s cell deviation from the ideal grid
of a theoretical “perfect symbol”.
The Data Matrix reference decode algorithm is applied to a binarized image
of the symbol, comparing its grid intersections to ideal grid intersections. The
greatest distance from an actual to a theoretical grid intersection determines
the Grid Non-Uniformity grade.
Y
X
Actual grid
intersection
Ideal grid
intersection
Vector
deviation
Symbol Detail
Содержание Quadrus Verifier
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Страница 210: ...6 32 Quadrus Verifier User s Manual Setting Up the Verifier for EZ Trax ...
Страница 302: ...8 62 Quadrus Verifier User s Manual Configuring EZ Trax Output ...
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Страница 404: ...15 14 Quadrus Verifier User s Manual Ordered Output Filter ...
Страница 444: ...A 30 Quadrus Verifier User s Manual Glossary of Terms ...