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Changing Thick Bar Determination Criteria
Optical and print characteristics may result in discrepancies in the thickness of black and white
bars, thereby preventing accurate ratios from being obtained during scanning. By checking the left
guard bar and central bar, the black and white bar discrepancies are obtained and incorporated into
the thick bar determination. Changing the position of the bars to be checked can enhance the
scanning accuracy of bar codes which contain some bars with anomalous ratios.
Depending on the bar code system, some codes may have left guard bars and center bars while
others may not. This change is effective for those codes which have the elements. The
symbologies on which this change is effective are listed below.
- EAN, JAN, UPC-A, UPC-B
- EAN, JAN, UPC-A, UPC-B Add-ons
- UPC-E
- UPC-E Add-on
Changing Calculation Method for Thick bar Determination
Optical and print characteristics may result in discrepancies in the thickness of black and white
bars, thereby preventing accurate ratios from being obtained during scanning. This means that
scanning may not be possible when the ratios of the black and white bars are not uniform. This
problem can be overcome by analyzing the black and white bars separately.
Depending on the bar code system, this method of analyzing the black and white codes separately
is effective for some symbologies but not for others. The symbologies on which this analysis
method is effective are listed below.
- EAN, JAN, UPC-A, UPC-B
- EAN, JAN, UPC-A, UPC-B Add-ons
- UPC-E
- UPC-E Add-on
- Code39
- NW7
- Code93
- Code128
Changing Noise Filter Threshold Values
A combination of laser module optical characteristics and barcode printing conditions can
generate noise within the bar code scanning data resulting in the inability to scan. This problem
can be dealt with by removing noise. This is achieved by identifying all data at or below a
prescribed threshold value as noise and removing it when detected by linking it to preceding and
subsequent data.
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