READING FEATURES
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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 43.
Laser Beam
Figure 43 - 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 DX8200 is able to "reconstruct" the barcode. A typical
set of partial scans is shown in Figure 44.
Code Direction
Figure 44 - 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.