Datalogic Scanning LASER SCANNER DS4300 - Manual (Page 42)

DATALOGIC DS4300
Reading Features - 3.1
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 3.1.
Laser Beam
Figure 3.1 - 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
DS4300 is able to "reconstruct" the barcode. A typical set of partial scans is
shown in Figure 3.2.
Code Direction
Figure 3.2 - 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.