Datalogic DX8210, Reference Manual

Page: 262 / 300

Barcode Scanning Features
250 DX8210 Barcode Scanner
Advanced Code Reconstruction (ACR™)
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 following figure:
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 DX8210 is able to
“reconstruct” the barcode. A typical set of partial scans is shown in the figure
below:
None of the partial scans contains the whole label. The decoder aligns each par-
tial 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.
Tilt Angle for Advanced Code Reconstruction
The most important parameter in Advanced Code Reconstruction is the value of
the maximum tilt angle (

maximum) under which the code reconstruction pro-
cess is still possible.
The decoder will be able to read the label with a tilt angle b  max and
-

max as shown in the following figure: