Microscan QX Hawk Uživatelský manuál stáhnout pdf (Strana 312)

100

101

7-30 QX Hawk Industrial Imager User Manual

Static Validation

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Axial Non-Uniformity (Data Matrix Only)

Unused Error Correction

(Data Matrix Only)

Definition: The extent to which dark or light markings appropriately fill or exceed

their module boundaries. These values are determined by counting pixels

in the clock pattern of the binary digitized image, then comparing it to a

nominal value and minimum and maximum values. The grade is defined

in this way:

A (4.0) if -.050 ? PG ? 0.50

B (3.0) if -.070 ? PG ? 0.70

C (2.0) if -.085 ? PG ? 0.85

D (1.0) if -.100 ? PG ? 1.00

F (0.0) if PG < -1.00 or PG > 1.00

Definition: Axial non-uniformity is a measure of how much the sampling point

spacing differs from one axis to another, namely

AN = abs (XAVG - YAVG) / ((XAVG + YAVG)/2)

where abs ( ) yields the absolute value. If a symbology has more than two

major axes, then AN is computed for those two average spacings which

differ

the most. The grade is defined in this way:

A (4.0) if AN ? .06

B (2.0) if AN ? .08

C (2.0) if AN ? .10

D (1.0) if AN ? .12

F (0.0) if AN ? .12

Definition:

The correction capacity of Reed-Solomon decoding is expressed in the

equation:

e + 2d

d - p

where e is the number of erasures, t is the number of errors, d is the

number

of error correction codewords, and

is the number of codewords

reserved for error detection.

The Unused Error Correction parameter tests the extent to which regional

or spot damage in the symbol has eroded the decoding safety margin that

error correction provides. The grade is defined in this way:

A (4.0) if UEC ? .62

B (3.0) if UEC ? .50

C (2.0) if UEC ? .37

D (1.0) if UEC ? .25

F (0.0) if UEC ? .25

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