DS8100
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4
4 READING FEATURES
4.1 ADVANCED CODE RECONSTRUCTION
The traditional way of barcode reading could be called "Linear Reading". In this case,
the laser beam crosses the barcode symbol from its beginning to its end as shown in
Figure 48.
Laser Beam
Figure 48 - Linear reading
In "Advanced Code Reconstruction" mode, it is no longer necessary for the laser
beam to cross the label from the start to the end. With just a set of partial scans on
the label (obtained using the motion of the label itself), the DS8100 is able to
"reconstruct" the barcode. A typical set of partial scans is shown in Figure 49.
Code Direction
Figure 49 - Partial scans
None of the partial scans contains the whole label. The decoder aligns each partial
scan correctly and combines them in order to obtain the entire code.
The alignment is performed by calculating the time difference from one partial scan to
another using a reference code element.
4.1.1 Tilt Angle for Advanced Code Reconstruction
The most important parameter in Advanced Code Reconstruction is the value of the
maximum tilt angle (α maximum) under which the code reconstruction process is still
possible.
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