Datalogic matrix 450N Reference Manual page 117

SOFTWARE CONFIGURATION
Automatic Image Settings Selection
If we don't know from one item to the next which reading condition will be presented, we will
cycle through the pre-defined database of Image Settings (one per acquisition) in order to
automatically capture the correctly lighted image over the course of several acquisitions.
When the correct condition is matched, the result should be able to produce a Good Read.
When the Image Settings Selection is Automatic (default), then these Image Settings
groups will be used cyclically.
NOTE: Applications typically require more than one acquisition to obtain
sufficient Good Read percentages. This means that for N acquisitions we will
surely have captured the correct lighting condition but we will also have
captured some acquisitions with the wrong lighting condition. A consequence
then is that we cannot run these types of applications at the maximum speed
because not all the acquisitions are useful to us. We must wait for a sufficient
number of acquisitions that will guarantee a Good Read result.
If items to be read having the same lighting conditions are grouped together, then we can
improve the read rate through the Start Acquisition From parameter. By choosing the Last
Successful value, we will start with the Image Setting that last produced a Good Read. For
this group of items the last Image Setting used will be correct for the next item and so we
start each cycle with the acquisition that will potentially produce a Good Read.
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