Datalogic Scanning DS4600A - Manual (Page 37)

READING FEATURES
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3 READING FEATURES
3.1 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 27.
Laser Beam
Figure 27 - 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 DS4600A is able to
"reconstruct" the barcode. A typical set of partial scans is shown in Figure 28.
Code Direction
Figure 28 - 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.
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