Casio DT-X7 Series Software Manual page 72

Dual Decoders System
The dual decoders system initially decodes a scanned bar code data using the standard decoder,
but if decoding fails, it will use the following additional decoder to scan the same bar code. This
dual decoders system supports the bar code symbologies listed below.
• Code39
• Code128
• EAN
With the decoding system used for the previous Casio handheld terminals, decoding is processed
with a mean value of one module adding bar thickness of each black bar and white bar for one
character when performing binaryzation or quardruplzation of bar thickness. However, this
method does not accurately decode a bar code if it is formed with unbalanced bar thickness
between white bars and black bars.
The dual decoders system can solve it by calculating separately each mean value of black bars and
white bars for such a bar code with unbalanced thickness of white and black bars by changing the
threshold level of decoding.
Note:
The DT-X7M10U does not support the dual decoders system.
The functions of the Laser Scanner Library relevant to the "Dual Decoders System" are as
follows.
OBRSetDecodeLevel
OBRGetDecodeLevel : Retrieves the decoding level.
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 2.50 Customizing the elements
Element
Change margin of the
right/left threshold values
Change of compensation
values of the
thickness/thinness of a bar.
Note:
The DT-X7M10U does not support the customization function.
: Sets up decoding level.
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.
Value for thickening or thinning each bar can be changed.
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Description