Datalogic DX8200, Reference Manual

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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 the figure
below.
Laser Beam
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 Controller is able to "reconstruct" the
barcode. A typical set of partial scans is shown below.
Code Direction
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.