Specifications

49
Customizing the Decoder
According to the scan environment and the bar code printed material’s quality, the decoder can be
customized to efficiently improve scanning performance. First, to maintain scanning performance
with the normal decoding logic, perform decoding using with the decoder and if it does not
succeed the decoding, customize it so that the decoding can be performed for a better scanning
performance.
Table. 2.44 Customizing the elements
Element Description
Change margin of the right/left
threshold values
Used to change the threshold values of right and left side marginal
spaces which are allocated for areas colored in white on the left and right
sides of a bar code.
Used to thicken or thin each bar of bar code for a specified value and
then decode it.
Change of compensation values
of the thickness/thinness of a bar.
Value for thickening or thinning each bar can be changed.
Changing the threshold values for Right and Left margins
When a bar code is printed inside of quadrangle, scanning may not be possible because there is
not enough left and/or right marginal space. By making change on the right/left marginal
threshold values, scanning a bar code becomes possible. See the table below.
Table. 2.45
When the left marginal space is
narrow.
When the right marginal space is
narrow.
When both right and left
marginal spaces are narrow.
Changing the thickness of bars
If bars of a bar code are printed thick because blurring or scratchy white bars (spaces between two
bars) are printed thinly, the bar ratio will not be correct causing scanning incorrectly. By adjusting
the thickness of these bars makes scanning the bar code possible. This method is applicable if all
bars of a bar code are either too thick or too thin because the method is applied to the whole of a
bar code.